Merge commit 'd9e077468ab3446cbd7306a453a73dad2c1403e8' into firmware_21

14 files changed, 3037 insertions, 0 deletions

diff --git a/drivers/led/issi/is31fl3218.c b/drivers/led/issi/is31fl3218.c
new file mode 100644
index 0000000000..d43863ac4b
--- /dev/null
+++ b/drivers/led/issi/is31fl3218.c
@@ -0,0 +1,96 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "is31fl3218.h"
+#include "i2c_master.h"
+
+// This is the full 8-bit address
+#define ISSI_ADDRESS 0b10101000
+
+// These are the register addresses
+#define ISSI_REG_SHUTDOWN 0x00
+#define ISSI_REG_PWM 0x01
+#define ISSI_REG_CONTROL 0x13
+#define ISSI_REG_UPDATE 0x16
+#define ISSI_REG_RESET 0x17
+
+// Default timeout if no I2C response
+#define ISSI_TIMEOUT 100
+
+// Reusable buffer for transfers
+uint8_t g_twi_transfer_buffer[20];
+
+// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
+// If used as RGB LED driver, LEDs are assigned RGB,RGB,RGB,RGB,RGB,RGB
+uint8_t g_pwm_buffer[18];
+bool    g_pwm_buffer_update_required = false;
+
+void IS31FL3218_write_register(uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+    i2c_transmit(ISSI_ADDRESS, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+}
+
+void IS31FL3218_write_pwm_buffer(uint8_t *pwm_buffer) {
+    g_twi_transfer_buffer[0] = ISSI_REG_PWM;
+    for (int i = 0; i < 18; i++) {
+        g_twi_transfer_buffer[1 + i] = pwm_buffer[i];
+    }
+
+    i2c_transmit(ISSI_ADDRESS, g_twi_transfer_buffer, 19, ISSI_TIMEOUT);
+}
+
+void IS31FL3218_init(void) {
+    // In case we ever want to reinitialize (?)
+    IS31FL3218_write_register(ISSI_REG_RESET, 0x00);
+
+    // Turn off software shutdown
+    IS31FL3218_write_register(ISSI_REG_SHUTDOWN, 0x01);
+
+    // Set all PWM values to zero
+    for (uint8_t i = 0; i < 18; i++) {
+        IS31FL3218_write_register(ISSI_REG_PWM + i, 0x00);
+    }
+
+    // Enable all channels
+    for (uint8_t i = 0; i < 3; i++) {
+        IS31FL3218_write_register(ISSI_REG_CONTROL + i, 0b00111111);
+    }
+
+    // Load PWM registers and LED Control register data
+    IS31FL3218_write_register(ISSI_REG_UPDATE, 0x01);
+}
+
+void IS31FL3218_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    g_pwm_buffer[index * 3 + 0]  = red;
+    g_pwm_buffer[index * 3 + 1]  = green;
+    g_pwm_buffer[index * 3 + 2]  = blue;
+    g_pwm_buffer_update_required = true;
+}
+
+void IS31FL3218_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < 6; i++) {
+        IS31FL3218_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3218_update_pwm_buffers(void) {
+    if (g_pwm_buffer_update_required) {
+        IS31FL3218_write_pwm_buffer(g_pwm_buffer);
+        // Load PWM registers and LED Control register data
+        IS31FL3218_write_register(ISSI_REG_UPDATE, 0x01);
+    }
+    g_pwm_buffer_update_required = false;
+}
diff --git a/drivers/led/issi/is31fl3218.h b/drivers/led/issi/is31fl3218.h
new file mode 100644
index 0000000000..fa760da191
--- /dev/null
+++ b/drivers/led/issi/is31fl3218.h
@@ -0,0 +1,25 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+void IS31FL3218_init(void);
+void IS31FL3218_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3218_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3218_update_pwm_buffers(void);
diff --git a/drivers/led/issi/is31fl3731-simple.c b/drivers/led/issi/is31fl3731-simple.c
new file mode 100644
index 0000000000..d295772f5e
--- /dev/null
+++ b/drivers/led/issi/is31fl3731-simple.c
@@ -0,0 +1,233 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2019 Clueboard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "is31fl3731-simple.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 0b1110100 AD <-> GND
+// 0b1110111 AD <-> VCC
+// 0b1110101 AD <-> SCL
+// 0b1110110 AD <-> SDA
+#define ISSI_ADDR_DEFAULT 0x74
+
+#define ISSI_REG_CONFIG 0x00
+#define ISSI_REG_CONFIG_PICTUREMODE 0x00
+#define ISSI_REG_CONFIG_AUTOPLAYMODE 0x08
+#define ISSI_REG_CONFIG_AUDIOPLAYMODE 0x18
+
+#define ISSI_CONF_PICTUREMODE 0x00
+#define ISSI_CONF_AUTOFRAMEMODE 0x04
+#define ISSI_CONF_AUDIOMODE 0x08
+
+#define ISSI_REG_PICTUREFRAME 0x01
+
+#define ISSI_REG_SHUTDOWN 0x0A
+#define ISSI_REG_AUDIOSYNC 0x06
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_BANK_FUNCTIONREG 0x0B  // helpfully called 'page nine'
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3731 PWM registers 0x24-0xB3.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3731_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[LED_DRIVER_COUNT][144];
+bool    g_pwm_buffer_update_required[LED_DRIVER_COUNT] = {false};
+
+/* There's probably a better way to init this... */
+#if LED_DRIVER_COUNT == 1
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}};
+#elif LED_DRIVER_COUNT == 2
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}, {0}};
+#elif LED_DRIVER_COUNT == 3
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}, {0}, {0}};
+#elif LED_DRIVER_COUNT == 4
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}, {0}, {0}, {0}};
+#endif
+bool g_led_control_registers_update_required[LED_DRIVER_COUNT] = {false};
+
+// This is the bit pattern in the LED control registers
+// (for matrix A, add one to register for matrix B)
+//
+//  reg -  b7  b6  b5  b4  b3  b2  b1  b0
+// 0x00 - R08,R07,R06,R05,R04,R03,R02,R01
+// 0x02 - G08,G07,G06,G05,G04,G03,G02,R00
+// 0x04 - B08,B07,B06,B05,B04,B03,G01,G00
+// 0x06 -  - , - , - , - , - ,B02,B01,B00
+// 0x08 -  - , - , - , - , - , - , - , -
+// 0x0A - B17,B16,B15, - , - , - , - , -
+// 0x0C - G17,G16,B14,B13,B12,B11,B10,B09
+// 0x0E - R17,G15,G14,G13,G12,G11,G10,G09
+// 0x10 - R16,R15,R14,R13,R12,R11,R10,R09
+
+void IS31FL3731_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) {
+            break;
+        }
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+void IS31FL3731_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // assumes bank is already selected
+
+    // transmit PWM registers in 9 transfers of 16 bytes
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // iterate over the pwm_buffer contents at 16 byte intervals
+    for (int i = 0; i < 144; i += 16) {
+        // set the first register, e.g. 0x24, 0x34, 0x44, etc.
+        g_twi_transfer_buffer[0] = 0x24 + i;
+        // copy the data from i to i+15
+        // device will auto-increment register for data after the first byte
+        // thus this sets registers 0x24-0x33, 0x34-0x43, etc. in one transfer
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
+#endif
+    }
+}
+
+void IS31FL3731_init(uint8_t addr) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, first enable software shutdown,
+    // then set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+
+    // select "function register" bank
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG);
+
+    // enable software shutdown
+    IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x00);
+
+    // this delay was copied from other drivers, might not be needed
+    wait_ms(10);
+
+    // picture mode
+    IS31FL3731_write_register(addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE);
+    // display frame 0
+    IS31FL3731_write_register(addr, ISSI_REG_PICTUREFRAME, 0x00);
+    // audio sync off
+    IS31FL3731_write_register(addr, ISSI_REG_AUDIOSYNC, 0x00);
+
+    // select bank 0
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, 0);
+
+    // turn off all LEDs in the LED control register
+    for (int i = 0x00; i <= 0x11; i++) {
+        IS31FL3731_write_register(addr, i, 0x00);
+    }
+
+    // turn off all LEDs in the blink control register (not really needed)
+    for (int i = 0x12; i <= 0x23; i++) {
+        IS31FL3731_write_register(addr, i, 0x00);
+    }
+
+    // set PWM on all LEDs to 0
+    for (int i = 0x24; i <= 0xB3; i++) {
+        IS31FL3731_write_register(addr, i, 0x00);
+    }
+
+    // select "function register" bank
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG);
+
+    // disable software shutdown
+    IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x01);
+
+    // select bank 0 and leave it selected.
+    // most usage after initialization is just writing PWM buffers in bank 0
+    // as there's not much point in double-buffering
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, 0);
+}
+
+void IS31FL3731_set_value(int index, uint8_t value) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        // Subtract 0x24 to get the second index of g_pwm_buffer
+        g_pwm_buffer[led.driver][led.v - 0x24]   = value;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3731_set_value_all(uint8_t value) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3731_set_value(i, value);
+    }
+}
+
+void IS31FL3731_set_led_control_register(uint8_t index, bool value) {
+    is31_led led = g_is31_leds[index];
+
+    uint8_t control_register = (led.v - 0x24) / 8;
+    uint8_t bit_value        = (led.v - 0x24) % 8;
+
+    if (value) {
+        g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
+    } else {
+        g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3731_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        IS31FL3731_write_pwm_buffer(addr, g_pwm_buffer[index]);
+        g_pwm_buffer_update_required[index] = false;
+    }
+}
+
+void IS31FL3731_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        for (int i = 0; i < 18; i++) {
+            IS31FL3731_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+        g_led_control_registers_update_required[index] = false;
+    }
+}
diff --git a/drivers/led/issi/is31fl3731-simple.h b/drivers/led/issi/is31fl3731-simple.h
new file mode 100644
index 0000000000..ecde31eed5
--- /dev/null
+++ b/drivers/led/issi/is31fl3731-simple.h
@@ -0,0 +1,208 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2019 Clueboard
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+typedef struct is31_led {
+    uint8_t driver : 2;
+    uint8_t v;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3731_init(uint8_t addr);
+void IS31FL3731_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+void IS31FL3731_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3731_set_value(int index, uint8_t value);
+void IS31FL3731_set_value_all(uint8_t value);
+
+void IS31FL3731_set_led_control_register(uint8_t index, bool value);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3731_update_pwm_buffers(uint8_t addr, uint8_t index);
+void IS31FL3731_update_led_control_registers(uint8_t addr, uint8_t index);
+
+#define C1_1 0x24
+#define C1_2 0x25
+#define C1_3 0x26
+#define C1_4 0x27
+#define C1_5 0x28
+#define C1_6 0x29
+#define C1_7 0x2A
+#define C1_8 0x2B
+
+#define C1_9 0x2C
+#define C1_10 0x2D
+#define C1_11 0x2E
+#define C1_12 0x2F
+#define C1_13 0x30
+#define C1_14 0x31
+#define C1_15 0x32
+#define C1_16 0x33
+
+#define C2_1 0x34
+#define C2_2 0x35
+#define C2_3 0x36
+#define C2_4 0x37
+#define C2_5 0x38
+#define C2_6 0x39
+#define C2_7 0x3A
+#define C2_8 0x3B
+
+#define C2_9 0x3C
+#define C2_10 0x3D
+#define C2_11 0x3E
+#define C2_12 0x3F
+#define C2_13 0x40
+#define C2_14 0x41
+#define C2_15 0x42
+#define C2_16 0x43
+
+#define C3_1 0x44
+#define C3_2 0x45
+#define C3_3 0x46
+#define C3_4 0x47
+#define C3_5 0x48
+#define C3_6 0x49
+#define C3_7 0x4A
+#define C3_8 0x4B
+
+#define C3_9 0x4C
+#define C3_10 0x4D
+#define C3_11 0x4E
+#define C3_12 0x4F
+#define C3_13 0x50
+#define C3_14 0x51
+#define C3_15 0x52
+#define C3_16 0x53
+
+#define C4_1 0x54
+#define C4_2 0x55
+#define C4_3 0x56
+#define C4_4 0x57
+#define C4_5 0x58
+#define C4_6 0x59
+#define C4_7 0x5A
+#define C4_8 0x5B
+
+#define C4_9 0x5C
+#define C4_10 0x5D
+#define C4_11 0x5E
+#define C4_12 0x5F
+#define C4_13 0x60
+#define C4_14 0x61
+#define C4_15 0x62
+#define C4_16 0x63
+
+#define C5_1 0x64
+#define C5_2 0x65
+#define C5_3 0x66
+#define C5_4 0x67
+#define C5_5 0x68
+#define C5_6 0x69
+#define C5_7 0x6A
+#define C5_8 0x6B
+
+#define C5_9 0x6C
+#define C5_10 0x6D
+#define C5_11 0x6E
+#define C5_12 0x6F
+#define C5_13 0x70
+#define C5_14 0x71
+#define C5_15 0x72
+#define C5_16 0x73
+
+#define C6_1 0x74
+#define C6_2 0x75
+#define C6_3 0x76
+#define C6_4 0x77
+#define C6_5 0x78
+#define C6_6 0x79
+#define C6_7 0x7A
+#define C6_8 0x7B
+
+#define C6_9 0x7C
+#define C6_10 0x7D
+#define C6_11 0x7E
+#define C6_12 0x7F
+#define C6_13 0x80
+#define C6_14 0x81
+#define C6_15 0x82
+#define C6_16 0x83
+
+#define C7_1 0x84
+#define C7_2 0x85
+#define C7_3 0x86
+#define C7_4 0x87
+#define C7_5 0x88
+#define C7_6 0x89
+#define C7_7 0x8A
+#define C7_8 0x8B
+
+#define C7_9 0x8C
+#define C7_10 0x8D
+#define C7_11 0x8E
+#define C7_12 0x8F
+#define C7_13 0x90
+#define C7_14 0x91
+#define C7_15 0x92
+#define C7_16 0x93
+
+#define C8_1 0x94
+#define C8_2 0x95
+#define C8_3 0x96
+#define C8_4 0x97
+#define C8_5 0x98
+#define C8_6 0x99
+#define C8_7 0x9A
+#define C8_8 0x9B
+
+#define C8_9 0x9C
+#define C8_10 0x9D
+#define C8_11 0x9E
+#define C8_12 0x9F
+#define C8_13 0xA0
+#define C8_14 0xA1
+#define C8_15 0xA2
+#define C8_16 0xA3
+
+#define C9_1 0xA4
+#define C9_2 0xA5
+#define C9_3 0xA6
+#define C9_4 0xA7
+#define C9_5 0xA8
+#define C9_6 0xA9
+#define C9_7 0xAA
+#define C9_8 0xAB
+
+#define C9_9 0xAC
+#define C9_10 0xAD
+#define C9_11 0xAE
+#define C9_12 0xAF
+#define C9_13 0xB0
+#define C9_14 0xB1
+#define C9_15 0xB2
+#define C9_16 0xB3
diff --git a/drivers/led/issi/is31fl3731.c b/drivers/led/issi/is31fl3731.c
new file mode 100644
index 0000000000..110bdc1be4
--- /dev/null
+++ b/drivers/led/issi/is31fl3731.c
@@ -0,0 +1,237 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "is31fl3731.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 0b1110100 AD <-> GND
+// 0b1110111 AD <-> VCC
+// 0b1110101 AD <-> SCL
+// 0b1110110 AD <-> SDA
+#define ISSI_ADDR_DEFAULT 0x74
+
+#define ISSI_REG_CONFIG 0x00
+#define ISSI_REG_CONFIG_PICTUREMODE 0x00
+#define ISSI_REG_CONFIG_AUTOPLAYMODE 0x08
+#define ISSI_REG_CONFIG_AUDIOPLAYMODE 0x18
+
+#define ISSI_CONF_PICTUREMODE 0x00
+#define ISSI_CONF_AUTOFRAMEMODE 0x04
+#define ISSI_CONF_AUDIOMODE 0x08
+
+#define ISSI_REG_PICTUREFRAME 0x01
+
+#define ISSI_REG_SHUTDOWN 0x0A
+#define ISSI_REG_AUDIOSYNC 0x06
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_BANK_FUNCTIONREG 0x0B  // helpfully called 'page nine'
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3731 PWM registers 0x24-0xB3.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3731_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[DRIVER_COUNT][144];
+bool    g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
+
+uint8_t g_led_control_registers[DRIVER_COUNT][18]             = {{0}};
+bool    g_led_control_registers_update_required[DRIVER_COUNT] = {false};
+
+// This is the bit pattern in the LED control registers
+// (for matrix A, add one to register for matrix B)
+//
+//  reg -  b7  b6  b5  b4  b3  b2  b1  b0
+// 0x00 - R08,R07,R06,R05,R04,R03,R02,R01
+// 0x02 - G08,G07,G06,G05,G04,G03,G02,R00
+// 0x04 - B08,B07,B06,B05,B04,B03,G01,G00
+// 0x06 -  - , - , - , - , - ,B02,B01,B00
+// 0x08 -  - , - , - , - , - , - , - , -
+// 0x0A - B17,B16,B15, - , - , - , - , -
+// 0x0C - G17,G16,B14,B13,B12,B11,B10,B09
+// 0x0E - R17,G15,G14,G13,G12,G11,G10,G09
+// 0x10 - R16,R15,R14,R13,R12,R11,R10,R09
+
+void IS31FL3731_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+void IS31FL3731_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // assumes bank is already selected
+
+    // transmit PWM registers in 9 transfers of 16 bytes
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // iterate over the pwm_buffer contents at 16 byte intervals
+    for (int i = 0; i < 144; i += 16) {
+        // set the first register, e.g. 0x24, 0x34, 0x44, etc.
+        g_twi_transfer_buffer[0] = 0x24 + i;
+        // copy the data from i to i+15
+        // device will auto-increment register for data after the first byte
+        // thus this sets registers 0x24-0x33, 0x34-0x43, etc. in one transfer
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
+#endif
+    }
+}
+
+void IS31FL3731_init(uint8_t addr) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, first enable software shutdown,
+    // then set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+
+    // select "function register" bank
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG);
+
+    // enable software shutdown
+    IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x00);
+
+    // this delay was copied from other drivers, might not be needed
+    wait_ms(10);
+
+    // picture mode
+    IS31FL3731_write_register(addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE);
+    // display frame 0
+    IS31FL3731_write_register(addr, ISSI_REG_PICTUREFRAME, 0x00);
+    // audio sync off
+    IS31FL3731_write_register(addr, ISSI_REG_AUDIOSYNC, 0x00);
+
+    // select bank 0
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, 0);
+
+    // turn off all LEDs in the LED control register
+    for (int i = 0x00; i <= 0x11; i++) {
+        IS31FL3731_write_register(addr, i, 0x00);
+    }
+
+    // turn off all LEDs in the blink control register (not really needed)
+    for (int i = 0x12; i <= 0x23; i++) {
+        IS31FL3731_write_register(addr, i, 0x00);
+    }
+
+    // set PWM on all LEDs to 0
+    for (int i = 0x24; i <= 0xB3; i++) {
+        IS31FL3731_write_register(addr, i, 0x00);
+    }
+
+    // select "function register" bank
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG);
+
+    // disable software shutdown
+    IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x01);
+
+    // select bank 0 and leave it selected.
+    // most usage after initialization is just writing PWM buffers in bank 0
+    // as there's not much point in double-buffering
+    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, 0);
+}
+
+void IS31FL3731_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        // Subtract 0x24 to get the second index of g_pwm_buffer
+        g_pwm_buffer[led.driver][led.r - 0x24]   = red;
+        g_pwm_buffer[led.driver][led.g - 0x24]   = green;
+        g_pwm_buffer[led.driver][led.b - 0x24]   = blue;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3731_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3731_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3731_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+
+    uint8_t control_register_r = (led.r - 0x24) / 8;
+    uint8_t control_register_g = (led.g - 0x24) / 8;
+    uint8_t control_register_b = (led.b - 0x24) / 8;
+    uint8_t bit_r              = (led.r - 0x24) % 8;
+    uint8_t bit_g              = (led.g - 0x24) % 8;
+    uint8_t bit_b              = (led.b - 0x24) % 8;
+
+    if (red) {
+        g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
+    } else {
+        g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
+    }
+    if (green) {
+        g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
+    } else {
+        g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
+    }
+    if (blue) {
+        g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
+    } else {
+        g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3731_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        IS31FL3731_write_pwm_buffer(addr, g_pwm_buffer[index]);
+    }
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void IS31FL3731_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        for (int i = 0; i < 18; i++) {
+            IS31FL3731_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+    }
+    g_led_control_registers_update_required[index] = false;
+}
diff --git a/drivers/led/issi/is31fl3731.h b/drivers/led/issi/is31fl3731.h
new file mode 100644
index 0000000000..803ea3ea12
--- /dev/null
+++ b/drivers/led/issi/is31fl3731.h
@@ -0,0 +1,209 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+typedef struct is31_led {
+    uint8_t driver : 2;
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3731_init(uint8_t addr);
+void IS31FL3731_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+void IS31FL3731_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3731_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3731_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+
+void IS31FL3731_set_led_control_register(uint8_t index, bool red, bool green, bool blue);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3731_update_pwm_buffers(uint8_t addr, uint8_t index);
+void IS31FL3731_update_led_control_registers(uint8_t addr, uint8_t index);
+
+#define C1_1 0x24
+#define C1_2 0x25
+#define C1_3 0x26
+#define C1_4 0x27
+#define C1_5 0x28
+#define C1_6 0x29
+#define C1_7 0x2A
+#define C1_8 0x2B
+
+#define C1_9 0x2C
+#define C1_10 0x2D
+#define C1_11 0x2E
+#define C1_12 0x2F
+#define C1_13 0x30
+#define C1_14 0x31
+#define C1_15 0x32
+#define C1_16 0x33
+
+#define C2_1 0x34
+#define C2_2 0x35
+#define C2_3 0x36
+#define C2_4 0x37
+#define C2_5 0x38
+#define C2_6 0x39
+#define C2_7 0x3A
+#define C2_8 0x3B
+
+#define C2_9 0x3C
+#define C2_10 0x3D
+#define C2_11 0x3E
+#define C2_12 0x3F
+#define C2_13 0x40
+#define C2_14 0x41
+#define C2_15 0x42
+#define C2_16 0x43
+
+#define C3_1 0x44
+#define C3_2 0x45
+#define C3_3 0x46
+#define C3_4 0x47
+#define C3_5 0x48
+#define C3_6 0x49
+#define C3_7 0x4A
+#define C3_8 0x4B
+
+#define C3_9 0x4C
+#define C3_10 0x4D
+#define C3_11 0x4E
+#define C3_12 0x4F
+#define C3_13 0x50
+#define C3_14 0x51
+#define C3_15 0x52
+#define C3_16 0x53
+
+#define C4_1 0x54
+#define C4_2 0x55
+#define C4_3 0x56
+#define C4_4 0x57
+#define C4_5 0x58
+#define C4_6 0x59
+#define C4_7 0x5A
+#define C4_8 0x5B
+
+#define C4_9 0x5C
+#define C4_10 0x5D
+#define C4_11 0x5E
+#define C4_12 0x5F
+#define C4_13 0x60
+#define C4_14 0x61
+#define C4_15 0x62
+#define C4_16 0x63
+
+#define C5_1 0x64
+#define C5_2 0x65
+#define C5_3 0x66
+#define C5_4 0x67
+#define C5_5 0x68
+#define C5_6 0x69
+#define C5_7 0x6A
+#define C5_8 0x6B
+
+#define C5_9 0x6C
+#define C5_10 0x6D
+#define C5_11 0x6E
+#define C5_12 0x6F
+#define C5_13 0x70
+#define C5_14 0x71
+#define C5_15 0x72
+#define C5_16 0x73
+
+#define C6_1 0x74
+#define C6_2 0x75
+#define C6_3 0x76
+#define C6_4 0x77
+#define C6_5 0x78
+#define C6_6 0x79
+#define C6_7 0x7A
+#define C6_8 0x7B
+
+#define C6_9 0x7C
+#define C6_10 0x7D
+#define C6_11 0x7E
+#define C6_12 0x7F
+#define C6_13 0x80
+#define C6_14 0x81
+#define C6_15 0x82
+#define C6_16 0x83
+
+#define C7_1 0x84
+#define C7_2 0x85
+#define C7_3 0x86
+#define C7_4 0x87
+#define C7_5 0x88
+#define C7_6 0x89
+#define C7_7 0x8A
+#define C7_8 0x8B
+
+#define C7_9 0x8C
+#define C7_10 0x8D
+#define C7_11 0x8E
+#define C7_12 0x8F
+#define C7_13 0x90
+#define C7_14 0x91
+#define C7_15 0x92
+#define C7_16 0x93
+
+#define C8_1 0x94
+#define C8_2 0x95
+#define C8_3 0x96
+#define C8_4 0x97
+#define C8_5 0x98
+#define C8_6 0x99
+#define C8_7 0x9A
+#define C8_8 0x9B
+
+#define C8_9 0x9C
+#define C8_10 0x9D
+#define C8_11 0x9E
+#define C8_12 0x9F
+#define C8_13 0xA0
+#define C8_14 0xA1
+#define C8_15 0xA2
+#define C8_16 0xA3
+
+#define C9_1 0xA4
+#define C9_2 0xA5
+#define C9_3 0xA6
+#define C9_4 0xA7
+#define C9_5 0xA8
+#define C9_6 0xA9
+#define C9_7 0xAA
+#define C9_8 0xAB
+
+#define C9_9 0xAC
+#define C9_10 0xAD
+#define C9_11 0xAE
+#define C9_12 0xAF
+#define C9_13 0xB0
+#define C9_14 0xB1
+#define C9_15 0xB2
+#define C9_16 0xB3
diff --git a/drivers/led/issi/is31fl3733.c b/drivers/led/issi/is31fl3733.c
new file mode 100644
index 0000000000..d99e5339c9
--- /dev/null
+++ b/drivers/led/issi/is31fl3733.c
@@ -0,0 +1,237 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "is31fl3733.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x50
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+
+#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
+#define ISSI_PAGE_PWM 0x01         // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
+#define ISSI_PAGE_FUNCTION 0x03    // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00  // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
+#define ISSI_REG_RESET 0x11          // PG3
+#define ISSI_REG_SWPULLUP 0x0F       // PG3
+#define ISSI_REG_CSPULLUP 0x10       // PG3
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3733 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3733_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
+
+uint8_t g_led_control_registers[DRIVER_COUNT][24]             = {0};
+bool    g_led_control_registers_update_required[DRIVER_COUNT] = {false};
+
+bool IS31FL3733_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    // If the transaction fails function returns false.
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+    }
+#else
+    if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) != 0) {
+        return false;
+    }
+#endif
+    return true;
+}
+
+bool IS31FL3733_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // Assumes PG1 is already selected.
+    // If any of the transactions fails function returns false.
+    // Transmit PWM registers in 12 transfers of 16 bytes.
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // Iterate over the pwm_buffer contents at 16 byte intervals.
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // Copy the data from i to i+15.
+        // Device will auto-increment register for data after the first byte
+        // Thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer.
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) != 0) {
+                return false;
+            }
+        }
+#else
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+#endif
+    }
+    return true;
+}
+
+void IS31FL3733_init(uint8_t addr, uint8_t sync) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+    // Sync is passed so set it according to the datasheet.
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG0
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+    // Turn off all LEDs.
+    for (int i = 0x00; i <= 0x17; i++) {
+        IS31FL3733_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG1
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+    // Set PWM on all LEDs to 0
+    // No need to setup Breath registers to PWM as that is the default.
+    for (int i = 0x00; i <= 0xBF; i++) {
+        IS31FL3733_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG3
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+    // Set global current to maximum.
+    IS31FL3733_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Disable software shutdown.
+    IS31FL3733_write_register(addr, ISSI_REG_CONFIGURATION, (sync << 6) | 0x01);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3733_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.r]          = red;
+        g_pwm_buffer[led.driver][led.g]          = green;
+        g_pwm_buffer[led.driver][led.b]          = blue;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3733_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3733_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3733_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+
+    uint8_t control_register_r = led.r / 8;
+    uint8_t control_register_g = led.g / 8;
+    uint8_t control_register_b = led.b / 8;
+    uint8_t bit_r              = led.r % 8;
+    uint8_t bit_g              = led.g % 8;
+    uint8_t bit_b              = led.b % 8;
+
+    if (red) {
+        g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
+    } else {
+        g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
+    }
+    if (green) {
+        g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
+    } else {
+        g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
+    }
+    if (blue) {
+        g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
+    } else {
+        g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3733_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG1.
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+
+        // If any of the transactions fail we risk writing dirty PG0,
+        // refresh page 0 just in case.
+        if (!IS31FL3733_write_pwm_buffer(addr, g_pwm_buffer[index])) {
+            g_led_control_registers_update_required[index] = true;
+        }
+    }
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void IS31FL3733_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG0
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+        for (int i = 0; i < 24; i++) {
+            IS31FL3733_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+    }
+    g_led_control_registers_update_required[index] = false;
+}
diff --git a/drivers/led/issi/is31fl3733.h b/drivers/led/issi/is31fl3733.h
new file mode 100644
index 0000000000..64fd38eb19
--- /dev/null
+++ b/drivers/led/issi/is31fl3733.h
@@ -0,0 +1,252 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+typedef struct is31_led {
+    uint8_t driver : 2;
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3733_init(uint8_t addr, uint8_t sync);
+bool IS31FL3733_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+bool IS31FL3733_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3733_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3733_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+
+void IS31FL3733_set_led_control_register(uint8_t index, bool red, bool green, bool blue);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3733_update_pwm_buffers(uint8_t addr, uint8_t index);
+void IS31FL3733_update_led_control_registers(uint8_t addr, uint8_t index);
+
+#define A_1 0x00
+#define A_2 0x01
+#define A_3 0x02
+#define A_4 0x03
+#define A_5 0x04
+#define A_6 0x05
+#define A_7 0x06
+#define A_8 0x07
+#define A_9 0x08
+#define A_10 0x09
+#define A_11 0x0A
+#define A_12 0x0B
+#define A_13 0x0C
+#define A_14 0x0D
+#define A_15 0x0E
+#define A_16 0x0F
+
+#define B_1 0x10
+#define B_2 0x11
+#define B_3 0x12
+#define B_4 0x13
+#define B_5 0x14
+#define B_6 0x15
+#define B_7 0x16
+#define B_8 0x17
+#define B_9 0x18
+#define B_10 0x19
+#define B_11 0x1A
+#define B_12 0x1B
+#define B_13 0x1C
+#define B_14 0x1D
+#define B_15 0x1E
+#define B_16 0x1F
+
+#define C_1 0x20
+#define C_2 0x21
+#define C_3 0x22
+#define C_4 0x23
+#define C_5 0x24
+#define C_6 0x25
+#define C_7 0x26
+#define C_8 0x27
+#define C_9 0x28
+#define C_10 0x29
+#define C_11 0x2A
+#define C_12 0x2B
+#define C_13 0x2C
+#define C_14 0x2D
+#define C_15 0x2E
+#define C_16 0x2F
+
+#define D_1 0x30
+#define D_2 0x31
+#define D_3 0x32
+#define D_4 0x33
+#define D_5 0x34
+#define D_6 0x35
+#define D_7 0x36
+#define D_8 0x37
+#define D_9 0x38
+#define D_10 0x39
+#define D_11 0x3A
+#define D_12 0x3B
+#define D_13 0x3C
+#define D_14 0x3D
+#define D_15 0x3E
+#define D_16 0x3F
+
+#define E_1 0x40
+#define E_2 0x41
+#define E_3 0x42
+#define E_4 0x43
+#define E_5 0x44
+#define E_6 0x45
+#define E_7 0x46
+#define E_8 0x47
+#define E_9 0x48
+#define E_10 0x49
+#define E_11 0x4A
+#define E_12 0x4B
+#define E_13 0x4C
+#define E_14 0x4D
+#define E_15 0x4E
+#define E_16 0x4F
+
+#define F_1 0x50
+#define F_2 0x51
+#define F_3 0x52
+#define F_4 0x53
+#define F_5 0x54
+#define F_6 0x55
+#define F_7 0x56
+#define F_8 0x57
+#define F_9 0x58
+#define F_10 0x59
+#define F_11 0x5A
+#define F_12 0x5B
+#define F_13 0x5C
+#define F_14 0x5D
+#define F_15 0x5E
+#define F_16 0x5F
+
+#define G_1 0x60
+#define G_2 0x61
+#define G_3 0x62
+#define G_4 0x63
+#define G_5 0x64
+#define G_6 0x65
+#define G_7 0x66
+#define G_8 0x67
+#define G_9 0x68
+#define G_10 0x69
+#define G_11 0x6A
+#define G_12 0x6B
+#define G_13 0x6C
+#define G_14 0x6D
+#define G_15 0x6E
+#define G_16 0x6F
+
+#define H_1 0x70
+#define H_2 0x71
+#define H_3 0x72
+#define H_4 0x73
+#define H_5 0x74
+#define H_6 0x75
+#define H_7 0x76
+#define H_8 0x77
+#define H_9 0x78
+#define H_10 0x79
+#define H_11 0x7A
+#define H_12 0x7B
+#define H_13 0x7C
+#define H_14 0x7D
+#define H_15 0x7E
+#define H_16 0x7F
+
+#define I_1 0x80
+#define I_2 0x81
+#define I_3 0x82
+#define I_4 0x83
+#define I_5 0x84
+#define I_6 0x85
+#define I_7 0x86
+#define I_8 0x87
+#define I_9 0x88
+#define I_10 0x89
+#define I_11 0x8A
+#define I_12 0x8B
+#define I_13 0x8C
+#define I_14 0x8D
+#define I_15 0x8E
+#define I_16 0x8F
+
+#define J_1 0x90
+#define J_2 0x91
+#define J_3 0x92
+#define J_4 0x93
+#define J_5 0x94
+#define J_6 0x95
+#define J_7 0x96
+#define J_8 0x97
+#define J_9 0x98
+#define J_10 0x99
+#define J_11 0x9A
+#define J_12 0x9B
+#define J_13 0x9C
+#define J_14 0x9D
+#define J_15 0x9E
+#define J_16 0x9F
+
+#define K_1 0xA0
+#define K_2 0xA1
+#define K_3 0xA2
+#define K_4 0xA3
+#define K_5 0xA4
+#define K_6 0xA5
+#define K_7 0xA6
+#define K_8 0xA7
+#define K_9 0xA8
+#define K_10 0xA9
+#define K_11 0xAA
+#define K_12 0xAB
+#define K_13 0xAC
+#define K_14 0xAD
+#define K_15 0xAE
+#define K_16 0xAF
+
+#define L_1 0xB0
+#define L_2 0xB1
+#define L_3 0xB2
+#define L_4 0xB3
+#define L_5 0xB4
+#define L_6 0xB5
+#define L_7 0xB6
+#define L_8 0xB7
+#define L_9 0xB8
+#define L_10 0xB9
+#define L_11 0xBA
+#define L_12 0xBB
+#define L_13 0xBC
+#define L_14 0xBD
+#define L_15 0xBE
+#define L_16 0xBF
diff --git a/drivers/led/issi/is31fl3736.c b/drivers/led/issi/is31fl3736.c
new file mode 100644
index 0000000000..7dece1b1eb
--- /dev/null
+++ b/drivers/led/issi/is31fl3736.c
@@ -0,0 +1,269 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "is31fl3736.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x50
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+
+#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
+#define ISSI_PAGE_PWM 0x01         // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
+#define ISSI_PAGE_FUNCTION 0x03    // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00  // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
+#define ISSI_REG_RESET 0x11          // PG3
+#define ISSI_REG_SWPULLUP 0x0F       // PG3
+#define ISSI_REG_CSPULLUP 0x10       // PG3
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3736 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3736_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required = false;
+
+uint8_t g_led_control_registers[DRIVER_COUNT][24] = {{0}, {0}};
+bool    g_led_control_registers_update_required   = false;
+
+void IS31FL3736_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+void IS31FL3736_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // assumes PG1 is already selected
+
+    // transmit PWM registers in 12 transfers of 16 bytes
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // iterate over the pwm_buffer contents at 16 byte intervals
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // copy the data from i to i+15
+        // device will auto-increment register for data after the first byte
+        // thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
+#endif
+    }
+}
+
+void IS31FL3736_init(uint8_t addr) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+
+    // Unlock the command register.
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG0
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+    // Turn off all LEDs.
+    for (int i = 0x00; i <= 0x17; i++) {
+        IS31FL3736_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG1
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+    // Set PWM on all LEDs to 0
+    // No need to setup Breath registers to PWM as that is the default.
+    for (int i = 0x00; i <= 0xBF; i++) {
+        IS31FL3736_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG3
+    IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+    // Set global current to maximum.
+    IS31FL3736_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Disable software shutdown.
+    IS31FL3736_write_register(addr, ISSI_REG_CONFIGURATION, 0x01);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3736_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.r] = red;
+        g_pwm_buffer[led.driver][led.g] = green;
+        g_pwm_buffer[led.driver][led.b] = blue;
+        g_pwm_buffer_update_required    = true;
+    }
+}
+
+void IS31FL3736_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3736_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3736_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+
+    // IS31FL3733
+    // The PWM register for a matrix position (0x00 to 0xBF) can be
+    // divided by 8 to get the LED control register (0x00 to 0x17),
+    // then mod 8 to get the bit position within that register.
+
+    // IS31FL3736
+    // The PWM register for a matrix position (0x00 to 0xBF) is interleaved, so:
+    // A1=0x00 A2=0x02 A3=0x04 A4=0x06 A5=0x08 A6=0x0A A7=0x0C A8=0x0E
+    // B1=0x10 B2=0x12 B3=0x14
+    // But also, the LED control registers (0x00 to 0x17) are also interleaved, so:
+    // A1-A4=0x00 A5-A8=0x01
+    // So, the same math applies.
+
+    uint8_t control_register_r = led.r / 8;
+    uint8_t control_register_g = led.g / 8;
+    uint8_t control_register_b = led.b / 8;
+
+    uint8_t bit_r = led.r % 8;
+    uint8_t bit_g = led.g % 8;
+    uint8_t bit_b = led.b % 8;
+
+    if (red) {
+        g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
+    } else {
+        g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
+    }
+    if (green) {
+        g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
+    } else {
+        g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
+    }
+    if (blue) {
+        g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
+    } else {
+        g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
+    }
+
+    g_led_control_registers_update_required = true;
+}
+
+void IS31FL3736_mono_set_brightness(int index, uint8_t value) {
+    if (index >= 0 && index < 96) {
+        // Index in range 0..95 -> A1..A8, B1..B8, etc.
+        // Map index 0..95 to registers 0x00..0xBE (interleaved)
+        uint8_t pwm_register          = index * 2;
+        g_pwm_buffer[0][pwm_register] = value;
+        g_pwm_buffer_update_required  = true;
+    }
+}
+
+void IS31FL3736_mono_set_brightness_all(uint8_t value) {
+    for (int i = 0; i < 96; i++) {
+        IS31FL3736_mono_set_brightness(i, value);
+    }
+}
+
+void IS31FL3736_mono_set_led_control_register(uint8_t index, bool enabled) {
+    // Index in range 0..95 -> A1..A8, B1..B8, etc.
+
+    // Map index 0..95 to registers 0x00..0xBE (interleaved)
+    uint8_t pwm_register = index * 2;
+    // Map register 0x00..0xBE (interleaved) into control register and bit
+    uint8_t control_register = pwm_register / 8;
+    uint8_t bit              = pwm_register % 8;
+
+    if (enabled) {
+        g_led_control_registers[0][control_register] |= (1 << bit);
+    } else {
+        g_led_control_registers[0][control_register] &= ~(1 << bit);
+    }
+
+    g_led_control_registers_update_required = true;
+}
+
+void IS31FL3736_update_pwm_buffers(uint8_t addr1, uint8_t addr2) {
+    if (g_pwm_buffer_update_required) {
+        // Firstly we need to unlock the command register and select PG1
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+
+        IS31FL3736_write_pwm_buffer(addr1, g_pwm_buffer[0]);
+        // IS31FL3736_write_pwm_buffer(addr2, g_pwm_buffer[1]);
+    }
+    g_pwm_buffer_update_required = false;
+}
+
+void IS31FL3736_update_led_control_registers(uint8_t addr1, uint8_t addr2) {
+    if (g_led_control_registers_update_required) {
+        // Firstly we need to unlock the command register and select PG0
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+        for (int i = 0; i < 24; i++) {
+            IS31FL3736_write_register(addr1, i, g_led_control_registers[0][i]);
+            // IS31FL3736_write_register(addr2, i, g_led_control_registers[1][i]);
+        }
+        g_led_control_registers_update_required = false;
+    }
+}
diff --git a/drivers/led/issi/is31fl3736.h b/drivers/led/issi/is31fl3736.h
new file mode 100644
index 0000000000..c956c87f7c
--- /dev/null
+++ b/drivers/led/issi/is31fl3736.h
@@ -0,0 +1,169 @@
+/* Copyright 2018 Jason Williams (Wilba)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+// Simple interface option.
+// If these aren't defined, just define them to make it compile
+
+#ifndef DRIVER_COUNT
+#    define DRIVER_COUNT 2
+#endif
+
+#ifndef DRIVER_LED_TOTAL
+#    define DRIVER_LED_TOTAL 96
+#endif
+
+typedef struct is31_led {
+    uint8_t driver : 2;
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3736_init(uint8_t addr);
+void IS31FL3736_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+void IS31FL3736_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3736_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3736_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+
+void IS31FL3736_set_led_control_register(uint8_t index, bool red, bool green, bool blue);
+
+void IS31FL3736_mono_set_brightness(int index, uint8_t value);
+void IS31FL3736_mono_set_brightness_all(uint8_t value);
+void IS31FL3736_mono_set_led_control_register(uint8_t index, bool enabled);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3736_update_pwm_buffers(uint8_t addr1, uint8_t addr2);
+void IS31FL3736_update_led_control_registers(uint8_t addr1, uint8_t addr2);
+
+#define A_1 0x00
+#define A_2 0x02
+#define A_3 0x04
+#define A_4 0x06
+#define A_5 0x08
+#define A_6 0x0A
+#define A_7 0x0C
+#define A_8 0x0E
+
+#define B_1 0x10
+#define B_2 0x12
+#define B_3 0x14
+#define B_4 0x16
+#define B_5 0x18
+#define B_6 0x1A
+#define B_7 0x1C
+#define B_8 0x1E
+
+#define C_1 0x20
+#define C_2 0x22
+#define C_3 0x24
+#define C_4 0x26
+#define C_5 0x28
+#define C_6 0x2A
+#define C_7 0x2C
+#define C_8 0x2E
+
+#define D_1 0x30
+#define D_2 0x32
+#define D_3 0x34
+#define D_4 0x36
+#define D_5 0x38
+#define D_6 0x3A
+#define D_7 0x3C
+#define D_8 0x3E
+
+#define E_1 0x40
+#define E_2 0x42
+#define E_3 0x44
+#define E_4 0x46
+#define E_5 0x48
+#define E_6 0x4A
+#define E_7 0x4C
+#define E_8 0x4E
+
+#define F_1 0x50
+#define F_2 0x52
+#define F_3 0x54
+#define F_4 0x56
+#define F_5 0x58
+#define F_6 0x5A
+#define F_7 0x5C
+#define F_8 0x5E
+
+#define G_1 0x60
+#define G_2 0x62
+#define G_3 0x64
+#define G_4 0x66
+#define G_5 0x68
+#define G_6 0x6A
+#define G_7 0x6C
+#define G_8 0x6E
+
+#define H_1 0x70
+#define H_2 0x72
+#define H_3 0x74
+#define H_4 0x76
+#define H_5 0x78
+#define H_6 0x7A
+#define H_7 0x7C
+#define H_8 0x7E
+
+#define I_1 0x80
+#define I_2 0x82
+#define I_3 0x84
+#define I_4 0x86
+#define I_5 0x88
+#define I_6 0x8A
+#define I_7 0x8C
+#define I_8 0x8E
+
+#define J_1 0x90
+#define J_2 0x92
+#define J_3 0x94
+#define J_4 0x96
+#define J_5 0x98
+#define J_6 0x9A
+#define J_7 0x9C
+#define J_8 0x9E
+
+#define K_1 0xA0
+#define K_2 0xA2
+#define K_3 0xA4
+#define K_4 0xA6
+#define K_5 0xA8
+#define K_6 0xAA
+#define K_7 0xAC
+#define K_8 0xAE
+
+#define L_1 0xB0
+#define L_2 0xB2
+#define L_3 0xB4
+#define L_4 0xB6
+#define L_5 0xB8
+#define L_6 0xBA
+#define L_7 0xBC
+#define L_8 0xBE
diff --git a/drivers/led/issi/is31fl3737.c b/drivers/led/issi/is31fl3737.c
new file mode 100644
index 0000000000..0bb4ddd425
--- /dev/null
+++ b/drivers/led/issi/is31fl3737.c
@@ -0,0 +1,222 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "is31fl3737.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x50
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+
+#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
+#define ISSI_PAGE_PWM 0x01         // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
+#define ISSI_PAGE_FUNCTION 0x03    // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00  // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
+#define ISSI_REG_RESET 0x11          // PG3
+#define ISSI_REG_SWPULLUP 0x0F       // PG3
+#define ISSI_REG_CSPULLUP 0x10       // PG3
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3737 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3737_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+
+uint8_t g_pwm_buffer[DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
+
+uint8_t g_led_control_registers[DRIVER_COUNT][24]             = {0};
+bool    g_led_control_registers_update_required[DRIVER_COUNT] = {false};
+
+void IS31FL3737_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+void IS31FL3737_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // assumes PG1 is already selected
+
+    // transmit PWM registers in 12 transfers of 16 bytes
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // iterate over the pwm_buffer contents at 16 byte intervals
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // copy the data from i to i+15
+        // device will auto-increment register for data after the first byte
+        // thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
+#endif
+    }
+}
+
+void IS31FL3737_init(uint8_t addr) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+
+    // Unlock the command register.
+    IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG0
+    IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+    // Turn off all LEDs.
+    for (int i = 0x00; i <= 0x17; i++) {
+        IS31FL3737_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG1
+    IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+    // Set PWM on all LEDs to 0
+    // No need to setup Breath registers to PWM as that is the default.
+    for (int i = 0x00; i <= 0xBF; i++) {
+        IS31FL3737_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG3
+    IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+    // Set global current to maximum.
+    IS31FL3737_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Disable software shutdown.
+    IS31FL3737_write_register(addr, ISSI_REG_CONFIGURATION, 0x01);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3737_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.r]          = red;
+        g_pwm_buffer[led.driver][led.g]          = green;
+        g_pwm_buffer[led.driver][led.b]          = blue;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3737_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3737_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3737_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+
+    uint8_t control_register_r = led.r / 8;
+    uint8_t control_register_g = led.g / 8;
+    uint8_t control_register_b = led.b / 8;
+    uint8_t bit_r              = led.r % 8;
+    uint8_t bit_g              = led.g % 8;
+    uint8_t bit_b              = led.b % 8;
+
+    if (red) {
+        g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
+    } else {
+        g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
+    }
+    if (green) {
+        g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
+    } else {
+        g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
+    }
+    if (blue) {
+        g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
+    } else {
+        g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3737_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG1
+        IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+
+        IS31FL3737_write_pwm_buffer(addr, g_pwm_buffer[index]);
+    }
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void IS31FL3737_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG0
+        IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3737_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+        for (int i = 0; i < 24; i++) {
+            IS31FL3737_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+    }
+    g_led_control_registers_update_required[index] = false;
+}
diff --git a/drivers/led/issi/is31fl3737.h b/drivers/led/issi/is31fl3737.h
new file mode 100644
index 0000000000..06886e9c9b
--- /dev/null
+++ b/drivers/led/issi/is31fl3737.h
@@ -0,0 +1,204 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+typedef struct is31_led {
+    uint8_t driver : 2;
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3737_init(uint8_t addr);
+void IS31FL3737_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+void IS31FL3737_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3737_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3737_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+
+void IS31FL3737_set_led_control_register(uint8_t index, bool red, bool green, bool blue);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3737_update_pwm_buffers(uint8_t addr1, uint8_t addr2);
+void IS31FL3737_update_led_control_registers(uint8_t addr1, uint8_t addr2);
+
+#define A_1 0x00
+#define A_2 0x01
+#define A_3 0x02
+#define A_4 0x03
+#define A_5 0x04
+#define A_6 0x05
+#define A_7 0x08
+#define A_8 0x09
+#define A_9 0x0A
+#define A_10 0x0B
+#define A_11 0x0C
+#define A_12 0x0D
+
+#define B_1 0x10
+#define B_2 0x11
+#define B_3 0x12
+#define B_4 0x13
+#define B_5 0x14
+#define B_6 0x15
+#define B_7 0x18
+#define B_8 0x19
+#define B_9 0x1A
+#define B_10 0x1B
+#define B_11 0x1C
+#define B_12 0x1D
+
+#define C_1 0x20
+#define C_2 0x21
+#define C_3 0x22
+#define C_4 0x23
+#define C_5 0x24
+#define C_6 0x25
+#define C_7 0x28
+#define C_8 0x29
+#define C_9 0x2A
+#define C_10 0x2B
+#define C_11 0x2C
+#define C_12 0x2D
+
+#define D_1 0x30
+#define D_2 0x31
+#define D_3 0x32
+#define D_4 0x33
+#define D_5 0x34
+#define D_6 0x35
+#define D_7 0x38
+#define D_8 0x39
+#define D_9 0x3A
+#define D_10 0x3B
+#define D_11 0x3C
+#define D_12 0x3D
+
+#define E_1 0x40
+#define E_2 0x41
+#define E_3 0x42
+#define E_4 0x43
+#define E_5 0x44
+#define E_6 0x45
+#define E_7 0x48
+#define E_8 0x49
+#define E_9 0x4A
+#define E_10 0x4B
+#define E_11 0x4C
+#define E_12 0x4D
+
+#define F_1 0x50
+#define F_2 0x51
+#define F_3 0x52
+#define F_4 0x53
+#define F_5 0x54
+#define F_6 0x55
+#define F_7 0x58
+#define F_8 0x59
+#define F_9 0x5A
+#define F_10 0x5B
+#define F_11 0x5C
+#define F_12 0x5D
+
+#define G_1 0x60
+#define G_2 0x61
+#define G_3 0x62
+#define G_4 0x63
+#define G_5 0x64
+#define G_6 0x65
+#define G_7 0x68
+#define G_8 0x69
+#define G_9 0x6A
+#define G_10 0x6B
+#define G_11 0x6C
+#define G_12 0x6D
+
+#define H_1 0x70
+#define H_2 0x71
+#define H_3 0x72
+#define H_4 0x73
+#define H_5 0x74
+#define H_6 0x75
+#define H_7 0x78
+#define H_8 0x79
+#define H_9 0x7A
+#define H_10 0x7B
+#define H_11 0x7C
+#define H_12 0x7D
+
+#define I_1 0x80
+#define I_2 0x81
+#define I_3 0x82
+#define I_4 0x83
+#define I_5 0x84
+#define I_6 0x85
+#define I_7 0x88
+#define I_8 0x89
+#define I_9 0x8A
+#define I_10 0x8B
+#define I_11 0x8C
+#define I_12 0x8D
+
+#define J_1 0x90
+#define J_2 0x91
+#define J_3 0x92
+#define J_4 0x93
+#define J_5 0x94
+#define J_6 0x95
+#define J_7 0x98
+#define J_8 0x99
+#define J_9 0x9A
+#define J_10 0x9B
+#define J_11 0x9C
+#define J_12 0x9D
+
+#define K_1 0xA0
+#define K_2 0xA1
+#define K_3 0xA2
+#define K_4 0xA3
+#define K_5 0xA4
+#define K_6 0xA5
+#define K_7 0xA8
+#define K_8 0xA9
+#define K_9 0xAA
+#define K_10 0xAB
+#define K_11 0xAC
+#define K_12 0xAD
+
+#define L_1 0xB0
+#define L_2 0xB1
+#define L_3 0xB2
+#define L_4 0xB3
+#define L_5 0xB4
+#define L_6 0xB5
+#define L_7 0xB8
+#define L_8 0xB9
+#define L_9 0xBA
+#define L_10 0xBB
+#define L_11 0xBC
+#define L_12 0xBD
diff --git a/drivers/led/issi/is31fl3741.c b/drivers/led/issi/is31fl3741.c
new file mode 100644
index 0000000000..24a273514e
--- /dev/null
+++ b/drivers/led/issi/is31fl3741.c
@@ -0,0 +1,255 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "wait.h"
+
+#include "is31fl3741.h"
+#include <string.h>
+#include "i2c_master.h"
+#include "progmem.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x60
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+#define ISSI_IDREGISTER 0xFC
+
+#define ISSI_PAGE_PWM0 0x00       // PG0
+#define ISSI_PAGE_PWM1 0x01       // PG1
+#define ISSI_PAGE_SCALING_0 0x02  // PG2
+#define ISSI_PAGE_SCALING_1 0x03  // PG3
+#define ISSI_PAGE_FUNCTION 0x04   // PG4
+
+#define ISSI_REG_CONFIGURATION 0x00  // PG4
+#define ISSI_REG_GLOBALCURRENT 0x01  // PG4
+#define ISSI_REG_PULLDOWNUP 0x02     // PG4
+#define ISSI_REG_RESET 0x3F          // PG4
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+#define ISSI_MAX_LEDS 351
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20] = {0xFF};
+
+// These buffers match the IS31FL3741 and IS31FL3741A PWM registers.
+// The scaling buffers match the PG2 and PG3 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3741_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[DRIVER_COUNT][ISSI_MAX_LEDS];
+bool    g_pwm_buffer_update_required[DRIVER_COUNT]        = {false};
+bool    g_scaling_registers_update_required[DRIVER_COUNT] = {false};
+
+uint8_t g_scaling_registers[DRIVER_COUNT][ISSI_MAX_LEDS];
+
+void IS31FL3741_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+bool IS31FL3741_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // unlock the command register and select PG2
+    IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+    IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM0);
+
+    for (int i = 0; i < 342; i += 18) {
+        if (i == 180) {
+            // unlock the command register and select PG2
+            IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+            IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM1);
+        }
+
+        g_twi_transfer_buffer[0] = i % 180;
+        memcpy(g_twi_transfer_buffer + 1, pwm_buffer + i, 18);
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 19, ISSI_TIMEOUT) != 0) {
+                return false;
+            }
+        }
+#else
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 19, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+#endif
+    }
+
+    // transfer the left cause the total number is 351
+    g_twi_transfer_buffer[0] = 162;
+    memcpy(g_twi_transfer_buffer + 1, pwm_buffer + 342, 9);
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 10, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+    }
+#else
+    if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 10, ISSI_TIMEOUT) != 0) {
+        return false;
+    }
+#endif
+
+    return true;
+}
+
+void IS31FL3741_init(uint8_t addr) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+    // Unlock the command register.
+
+    // Unlock the command register.
+    IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG4
+    IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+
+    // Set to Normal operation
+    IS31FL3741_write_register(addr, ISSI_REG_CONFIGURATION, 0x01);
+
+    // Set Golbal Current Control Register
+    IS31FL3741_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Set Pull up & Down for SWx CSy
+    IS31FL3741_write_register(addr, ISSI_REG_PULLDOWNUP, 0x77);
+
+    // IS31FL3741_update_led_scaling_registers(addr, 0xFF, 0xFF, 0xFF);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3741_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.r]          = red;
+        g_pwm_buffer[led.driver][led.g]          = green;
+        g_pwm_buffer[led.driver][led.b]          = blue;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3741_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3741_set_color(i, red, green, blue);
+    }
+}
+
+void IS31FL3741_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+
+    if (red) {
+        g_scaling_registers[led.driver][led.r] = 0xFF;
+    } else {
+        g_scaling_registers[led.driver][led.r] = 0x00;
+    }
+
+    if (green) {
+        g_scaling_registers[led.driver][led.g] = 0xFF;
+    } else {
+        g_scaling_registers[led.driver][led.g] = 0x00;
+    }
+
+    if (blue) {
+        g_scaling_registers[led.driver][led.b] = 0xFF;
+    } else {
+        g_scaling_registers[led.driver][led.b] = 0x00;
+    }
+
+    g_scaling_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3741_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        IS31FL3741_write_pwm_buffer(addr, g_pwm_buffer[index]);
+    }
+
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void IS31FL3741_set_pwm_buffer(const is31_led *pled, uint8_t red, uint8_t green, uint8_t blue) {
+    g_pwm_buffer[pled->driver][pled->r] = red;
+    g_pwm_buffer[pled->driver][pled->g] = green;
+    g_pwm_buffer[pled->driver][pled->b] = blue;
+
+    g_pwm_buffer_update_required[pled->driver] = true;
+}
+
+void IS31FL3741_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_scaling_registers_update_required[index]) {
+        // unlock the command register and select PG2
+        IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_SCALING_0);
+
+        // CS1_SW1 to CS30_SW6 are on PG2
+        for (int i = CS1_SW1; i <= CS30_SW6; ++i) {
+            IS31FL3741_write_register(addr, i, g_scaling_registers[0][i]);
+        }
+
+        // unlock the command register and select PG3
+        IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3741_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_SCALING_1);
+
+        // CS1_SW7 to CS39_SW9 are on PG3
+        for (int i = CS1_SW7; i <= CS39_SW9; ++i) {
+            IS31FL3741_write_register(addr, i - CS1_SW7, g_scaling_registers[0][i]);
+        }
+
+        g_scaling_registers_update_required[index] = false;
+    }
+}
+
+void IS31FL3741_set_scaling_registers(const is31_led *pled, uint8_t red, uint8_t green, uint8_t blue) {
+    g_scaling_registers[pled->driver][pled->r] = red;
+    g_scaling_registers[pled->driver][pled->g] = green;
+    g_scaling_registers[pled->driver][pled->b] = blue;
+
+    g_scaling_registers_update_required[pled->driver] = true;
+}
diff --git a/drivers/led/issi/is31fl3741.h b/drivers/led/issi/is31fl3741.h
new file mode 100644
index 0000000000..163a035233
--- /dev/null
+++ b/drivers/led/issi/is31fl3741.h
@@ -0,0 +1,421 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+typedef struct is31_led {
+    uint32_t driver : 2;
+    uint32_t r : 10;
+    uint32_t g : 10;
+    uint32_t b : 10;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3741_init(uint8_t addr);
+void IS31FL3741_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+bool IS31FL3741_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3741_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL3741_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+
+void IS31FL3741_set_led_control_register(uint8_t index, bool red, bool green, bool blue);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3741_update_pwm_buffers(uint8_t addr, uint8_t index);
+void IS31FL3741_update_led_control_registers(uint8_t addr, uint8_t index);
+void IS31FL3741_set_scaling_registers(const is31_led *pled, uint8_t red, uint8_t green, uint8_t blue);
+
+void IS31FL3741_set_pwm_buffer(const is31_led *pled, uint8_t red, uint8_t green, uint8_t blue);
+
+#define CS1_SW1 0x00
+#define CS2_SW1 0x01
+#define CS3_SW1 0x02
+#define CS4_SW1 0x03
+#define CS5_SW1 0x04
+#define CS6_SW1 0x05
+#define CS7_SW1 0x06
+#define CS8_SW1 0x07
+#define CS9_SW1 0x08
+#define CS10_SW1 0x09
+#define CS11_SW1 0x0A
+#define CS12_SW1 0x0B
+#define CS13_SW1 0x0C
+#define CS14_SW1 0x0D
+#define CS15_SW1 0x0E
+#define CS16_SW1 0x0F
+#define CS17_SW1 0x10
+#define CS18_SW1 0x11
+#define CS19_SW1 0x12
+#define CS20_SW1 0x13
+#define CS21_SW1 0x14
+#define CS22_SW1 0x15
+#define CS23_SW1 0x16
+#define CS24_SW1 0x17
+#define CS25_SW1 0x18
+#define CS26_SW1 0x19
+#define CS27_SW1 0x1A
+#define CS28_SW1 0x1B
+#define CS29_SW1 0x1C
+#define CS30_SW1 0x1D
+
+#define CS1_SW2 0x1E
+#define CS2_SW2 0x1F
+#define CS3_SW2 0x20
+#define CS4_SW2 0x21
+#define CS5_SW2 0x22
+#define CS6_SW2 0x23
+#define CS7_SW2 0x24
+#define CS8_SW2 0x25
+#define CS9_SW2 0x26
+#define CS10_SW2 0x27
+#define CS11_SW2 0x28
+#define CS12_SW2 0x29
+#define CS13_SW2 0x2A
+#define CS14_SW2 0x2B
+#define CS15_SW2 0x2C
+#define CS16_SW2 0x2D
+#define CS17_SW2 0x2E
+#define CS18_SW2 0x2F
+#define CS19_SW2 0x30
+#define CS20_SW2 0x31
+#define CS21_SW2 0x32
+#define CS22_SW2 0x33
+#define CS23_SW2 0x34
+#define CS24_SW2 0x35
+#define CS25_SW2 0x36
+#define CS26_SW2 0x37
+#define CS27_SW2 0x38
+#define CS28_SW2 0x39
+#define CS29_SW2 0x3A
+#define CS30_SW2 0x3B
+
+#define CS1_SW3 0x3C
+#define CS2_SW3 0x3D
+#define CS3_SW3 0x3E
+#define CS4_SW3 0x3F
+#define CS5_SW3 0x40
+#define CS6_SW3 0x41
+#define CS7_SW3 0x42
+#define CS8_SW3 0x43
+#define CS9_SW3 0x44
+#define CS10_SW3 0x45
+#define CS11_SW3 0x46
+#define CS12_SW3 0x47
+#define CS13_SW3 0x48
+#define CS14_SW3 0x49
+#define CS15_SW3 0x4A
+#define CS16_SW3 0x4B
+#define CS17_SW3 0x4C
+#define CS18_SW3 0x4D
+#define CS19_SW3 0x4E
+#define CS20_SW3 0x4F
+#define CS21_SW3 0x50
+#define CS22_SW3 0x51
+#define CS23_SW3 0x52
+#define CS24_SW3 0x53
+#define CS25_SW3 0x54
+#define CS26_SW3 0x55
+#define CS27_SW3 0x56
+#define CS28_SW3 0x57
+#define CS29_SW3 0x58
+#define CS30_SW3 0x59
+
+#define CS1_SW4 0x5A
+#define CS2_SW4 0x5B
+#define CS3_SW4 0x5C
+#define CS4_SW4 0x5D
+#define CS5_SW4 0x5E
+#define CS6_SW4 0x5F
+#define CS7_SW4 0x60
+#define CS8_SW4 0x61
+#define CS9_SW4 0x62
+#define CS10_SW4 0x63
+#define CS11_SW4 0x64
+#define CS12_SW4 0x65
+#define CS13_SW4 0x66
+#define CS14_SW4 0x67
+#define CS15_SW4 0x68
+#define CS16_SW4 0x69
+#define CS17_SW4 0x6A
+#define CS18_SW4 0x6B
+#define CS19_SW4 0x6C
+#define CS20_SW4 0x6D
+#define CS21_SW4 0x6E
+#define CS22_SW4 0x6F
+#define CS23_SW4 0x70
+#define CS24_SW4 0x71
+#define CS25_SW4 0x72
+#define CS26_SW4 0x73
+#define CS27_SW4 0x74
+#define CS28_SW4 0x75
+#define CS29_SW4 0x76
+#define CS30_SW4 0x77
+
+#define CS1_SW5 0x78
+#define CS2_SW5 0x79
+#define CS3_SW5 0x7A
+#define CS4_SW5 0x7B
+#define CS5_SW5 0x7C
+#define CS6_SW5 0x7D
+#define CS7_SW5 0x7E
+#define CS8_SW5 0x7F
+#define CS9_SW5 0x80
+#define CS10_SW5 0x81
+#define CS11_SW5 0x82
+#define CS12_SW5 0x83
+#define CS13_SW5 0x84
+#define CS14_SW5 0x85
+#define CS15_SW5 0x86
+#define CS16_SW5 0x87
+#define CS17_SW5 0x88
+#define CS18_SW5 0x89
+#define CS19_SW5 0x8A
+#define CS20_SW5 0x8B
+#define CS21_SW5 0x8C
+#define CS22_SW5 0x8D
+#define CS23_SW5 0x8E
+#define CS24_SW5 0x8F
+#define CS25_SW5 0x90
+#define CS26_SW5 0x91
+#define CS27_SW5 0x92
+#define CS28_SW5 0x93
+#define CS29_SW5 0x94
+#define CS30_SW5 0x95
+
+#define CS1_SW6 0x96
+#define CS2_SW6 0x97
+#define CS3_SW6 0x98
+#define CS4_SW6 0x99
+#define CS5_SW6 0x9A
+#define CS6_SW6 0x9B
+#define CS7_SW6 0x9C
+#define CS8_SW6 0x9D
+#define CS9_SW6 0x9E
+#define CS10_SW6 0x9F
+#define CS11_SW6 0xA0
+#define CS12_SW6 0xA1
+#define CS13_SW6 0xA2
+#define CS14_SW6 0xA3
+#define CS15_SW6 0xA4
+#define CS16_SW6 0xA5
+#define CS17_SW6 0xA6
+#define CS18_SW6 0xA7
+#define CS19_SW6 0xA8
+#define CS20_SW6 0xA9
+#define CS21_SW6 0xAA
+#define CS22_SW6 0xAB
+#define CS23_SW6 0xAC
+#define CS24_SW6 0xAD
+#define CS25_SW6 0xAE
+#define CS26_SW6 0xAF
+#define CS27_SW6 0xB0
+#define CS28_SW6 0xB1
+#define CS29_SW6 0xB2
+#define CS30_SW6 0xB3
+
+#define CS1_SW7 0xB4
+#define CS2_SW7 0xB5
+#define CS3_SW7 0xB6
+#define CS4_SW7 0xB7
+#define CS5_SW7 0xB8
+#define CS6_SW7 0xB9
+#define CS7_SW7 0xBA
+#define CS8_SW7 0xBB
+#define CS9_SW7 0xBC
+#define CS10_SW7 0xBD
+#define CS11_SW7 0xBE
+#define CS12_SW7 0xBF
+#define CS13_SW7 0xC0
+#define CS14_SW7 0xC1
+#define CS15_SW7 0xC2
+#define CS16_SW7 0xC3
+#define CS17_SW7 0xC4
+#define CS18_SW7 0xC5
+#define CS19_SW7 0xC6
+#define CS20_SW7 0xC7
+#define CS21_SW7 0xC8
+#define CS22_SW7 0xC9
+#define CS23_SW7 0xCA
+#define CS24_SW7 0xCB
+#define CS25_SW7 0xCC
+#define CS26_SW7 0xCD
+#define CS27_SW7 0xCE
+#define CS28_SW7 0xCF
+#define CS29_SW7 0xD0
+#define CS30_SW7 0xD1
+
+#define CS1_SW8 0xD2
+#define CS2_SW8 0xD3
+#define CS3_SW8 0xD4
+#define CS4_SW8 0xD5
+#define CS5_SW8 0xD6
+#define CS6_SW8 0xD7
+#define CS7_SW8 0xD8
+#define CS8_SW8 0xD9
+#define CS9_SW8 0xDA
+#define CS10_SW8 0xDB
+#define CS11_SW8 0xDC
+#define CS12_SW8 0xDD
+#define CS13_SW8 0xDE
+#define CS14_SW8 0xDF
+#define CS15_SW8 0xE0
+#define CS16_SW8 0xE1
+#define CS17_SW8 0xE2
+#define CS18_SW8 0xE3
+#define CS19_SW8 0xE4
+#define CS20_SW8 0xE5
+#define CS21_SW8 0xE6
+#define CS22_SW8 0xE7
+#define CS23_SW8 0xE8
+#define CS24_SW8 0xE9
+#define CS25_SW8 0xEA
+#define CS26_SW8 0xEB
+#define CS27_SW8 0xEC
+#define CS28_SW8 0xED
+#define CS29_SW8 0xEE
+#define CS30_SW8 0xEF
+
+#define CS1_SW9 0xF0
+#define CS2_SW9 0xF1
+#define CS3_SW9 0xF2
+#define CS4_SW9 0xF3
+#define CS5_SW9 0xF4
+#define CS6_SW9 0xF5
+#define CS7_SW9 0xF6
+#define CS8_SW9 0xF7
+#define CS9_SW9 0xF8
+#define CS10_SW9 0xF9
+#define CS11_SW9 0xFA
+#define CS12_SW9 0xFB
+#define CS13_SW9 0xFC
+#define CS14_SW9 0xFD
+#define CS15_SW9 0xFE
+#define CS16_SW9 0xFF
+#define CS17_SW9 0x100
+#define CS18_SW9 0x101
+#define CS19_SW9 0x102
+#define CS20_SW9 0x103
+#define CS21_SW9 0x104
+#define CS22_SW9 0x105
+#define CS23_SW9 0x106
+#define CS24_SW9 0x107
+#define CS25_SW9 0x108
+#define CS26_SW9 0x109
+#define CS27_SW9 0x10A
+#define CS28_SW9 0x10B
+#define CS29_SW9 0x10C
+#define CS30_SW9 0x10D
+
+#define CS31_SW1 0x10E
+#define CS32_SW1 0x10F
+#define CS33_SW1 0x110
+#define CS34_SW1 0x111
+#define CS35_SW1 0x112
+#define CS36_SW1 0x113
+#define CS37_SW1 0x114
+#define CS38_SW1 0x115
+#define CS39_SW1 0x116
+
+#define CS31_SW2 0x117
+#define CS32_SW2 0x118
+#define CS33_SW2 0x119
+#define CS34_SW2 0x11A
+#define CS35_SW2 0x11B
+#define CS36_SW2 0x11C
+#define CS37_SW2 0x11D
+#define CS38_SW2 0x11E
+#define CS39_SW2 0x11F
+
+#define CS31_SW3 0x120
+#define CS32_SW3 0x121
+#define CS33_SW3 0x122
+#define CS34_SW3 0x123
+#define CS35_SW3 0x124
+#define CS36_SW3 0x125
+#define CS37_SW3 0x126
+#define CS38_SW3 0x127
+#define CS39_SW3 0x128
+
+#define CS31_SW4 0x129
+#define CS32_SW4 0x12A
+#define CS33_SW4 0x12B
+#define CS34_SW4 0x12C
+#define CS35_SW4 0x12D
+#define CS36_SW4 0x12E
+#define CS37_SW4 0x12F
+#define CS38_SW4 0x130
+#define CS39_SW4 0x131
+
+#define CS31_SW5 0x132
+#define CS32_SW5 0x133
+#define CS33_SW5 0x134
+#define CS34_SW5 0x135
+#define CS35_SW5 0x136
+#define CS36_SW5 0x137
+#define CS37_SW5 0x138
+#define CS38_SW5 0x139
+#define CS39_SW5 0x13A
+
+#define CS31_SW6 0x13B
+#define CS32_SW6 0x13C
+#define CS33_SW6 0x13D
+#define CS34_SW6 0x13E
+#define CS35_SW6 0x13F
+#define CS36_SW6 0x140
+#define CS37_SW6 0x141
+#define CS38_SW6 0x142
+#define CS39_SW6 0x143
+
+#define CS31_SW7 0x144
+#define CS32_SW7 0x145
+#define CS33_SW7 0x146
+#define CS34_SW7 0x147
+#define CS35_SW7 0x148
+#define CS36_SW7 0x149
+#define CS37_SW7 0x14A
+#define CS38_SW7 0x14B
+#define CS39_SW7 0x14C
+
+#define CS31_SW8 0x14D
+#define CS32_SW8 0x14E
+#define CS33_SW8 0x14F
+#define CS34_SW8 0x150
+#define CS35_SW8 0x151
+#define CS36_SW8 0x152
+#define CS37_SW8 0x153
+#define CS38_SW8 0x154
+#define CS39_SW8 0x155
+
+#define CS31_SW9 0x156
+#define CS32_SW9 0x157
+#define CS33_SW9 0x158
+#define CS34_SW9 0x159
+#define CS35_SW9 0x15A
+#define CS36_SW9 0x15B
+#define CS37_SW9 0x15C
+#define CS38_SW9 0x15D
+#define CS39_SW9 0x15E