[Keyboard] Added D48 keyboard (#8548)

* [Keyboard] Added D48 keyboard.

* Updated README.

* Cleanups.

* Moved d48 to handwired/

* Added link to build process album.

* Coding conventions cleanups.

* Added DS1307 RTC!

* Minor cleanups.

* Apply suggestions from code review

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Minor refactoring.

* Readme fix.

* Moved leftover keymap-specific code from keyboard space into keymap.

* Added encoder button pins to extra matrix row.

* Updated README, updated pinout & cleaned up the glcdfont

* Apply suggestions from code review

Co-Authored-By: Drashna Jaelre <drashna@live.com>

* Update config.h

* Apply suggestions from code review

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Added default keymap. Refactored existing keymap.

* Update keyboards/handwired/d48/README.md

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Apply suggestions from code review

Co-Authored-By: Joel Challis <git@zvecr.com>

* Minor alignment fix.

* Update keyboards/handwired/d48/glcdfont_d48.c

Co-Authored-By: Ryan <fauxpark@gmail.com>

* Changes as per PR.

* Apply suggestions from code review

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

15 files changed, 1201 insertions, 0 deletions

diff --git a/keyboards/handwired/d48/README.md b/keyboards/handwired/d48/README.md
new file mode 100644
index 0000000000..a20b8a4251
--- /dev/null
+++ b/keyboards/handwired/d48/README.md
@@ -0,0 +1,87 @@
+# D48
+
+![Proton C based handwired 40% keyboard](https://i.imgur.com/2wCYuno.jpg)
+
+A Proton C based handwired 48 key keyboard with 2 rotary encoders, I2C OLED, WS2812 strip, buzzer & clock!
+
+- Keyboard Maintainer: Andrew Dunai
+- Hardware Supported: Proton C handwired
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/d48:default
+
+## Details
+
+- Proton C based handwired keyboard
+- 2x custom 1.25mm stainless steel plates
+- Kailh Choc White (clicky)
+- 2x rotary encoders
+- 0.91" 128x32 I<sup>2</sup>C OLED
+- Small buzzer mounted inside (still waiting for the AST1109MLTRQ boys)
+- WS2812 strip (14 LEDs)
+- DS1307 I<sup>2</sup>C module real-time clock
+
+Build process: [album](https://imgur.com/gallery/zZZGdDw)
+
+## Pinout
+
+![D48 pinout](https://imgur.com/QoStCvD.jpg)
+
+## Challenges
+
+I'm very happy with the result, but at some point Proton C was driving me nuts.
+
+I did a lot of trial and error during assembly & programming.
+There were a lot of *yet* undocumented caveats,
+so I'll outline them here so that you guys can avoid the same issues I had.
+
+## Matrix & encoders
+
+Although this is a 48-key board with a 12-col & 4-row matrix, I've decided to add an extra row above the first one
+to make my matrix 12x5 and wire encoders' push buttons as 2 extra keys, thus making it a total of 50 (12x4 + 2 encoders).
+I used 2 columns (9 & 12) for those buttons.
+
+So, a first row actually has 2 buttons on columns 9 & 12 (because encoders are located near those columns).
+Encoders' push buttons are also configured via QMK's keymap.
+
+Check out the `d48.h` & `config.h` for pins used & keymap macro definition.
+
+## I<sup>2</sup>C/OLED
+
+Most of the stuff worked out of the box, except me choosing the right pins for my OLED.
+
+On the Proton C pinout, there are 3 labels for I<sup>2</sup>C and for some reason
+there are 2 pairs of SDA/SCL for I<sup>2</sup>C<sup>1</sup> channel: `B8`/`B9` (rear left side) and `B6`/`B7` (rear right side).
+I'm not sure if this is a mistake or if I was doing something wrong. So initially I picked `B8`/`B9`
+which were not working. When I switched to B6/B7, things worked like a charm.
+Later I used B9 for matrix row. No issues so far.
+
+Oh, and by the way, while using `B8`/`B9`, keyboard was sometimes *swallowing* quick keypresses.
+I believe this was due to I(2)C timeouts (because incorrect pins were used for OLED).
+
+## Buzzer
+
+It turns out once you switch on `AUDIO_ENABLE`, you cannot use A4 & A5 because they interfere with the buzzer.
+My guess is that buzzer uses DAC channels (not sure why both).
+
+I couldn't find this in documentation. Honestly, Proton C has almost zero documentation and this was
+the biggest challenge. Anyway, apart from almost going crazy from those challenges, I really liked it!
+
+## RGB
+
+I used pin `A15` for my WS28128 RGB strip.
+
+## D1307 real-time clock
+
+Connecting DS1307 RTC was a piece of cake: same I<sup>2</sup> pins as OLED (SDA/SCL), GND to GND and power to Proton C VUSB pin (5v).
+
+## Other issues
+
+- `B5` could not be used for matrix.
+- `TAP_CODE_DELAY` had to be increased to 10 to fix `tap_code(KC_VOLU/KC_VOLD)` calls being swallowed in encoder callback.
+- Be extremely attentive about the pinout: keep in mind that **the official Proton C pinout displays the rear of the board, not the front.** Being used to front pinouts, I ended up soldering entire matrix to the wrong side, so I had to desolder every wire and connect it to the opposite side.
+
+## Conclusion
+
+I had a lot of fun. The layout was inspired by the Planck THK. Feel free to ask any questions!
diff --git a/keyboards/handwired/d48/config.h b/keyboards/handwired/d48/config.h
new file mode 100644
index 0000000000..9c23442997
--- /dev/null
+++ b/keyboards/handwired/d48/config.h
@@ -0,0 +1,77 @@
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x6060
+#define DEVICE_VER      0x0001
+#define MANUFACTURER    Andrew Dunai
+#define PRODUCT         D48
+
+/* Key matrix size */
+#define MATRIX_ROWS 5
+#define MATRIX_COLS 12
+
+/* Key matrix pins */
+#define MATRIX_ROW_PINS { B8, B9, B1, B2, B4 }
+
+#define MATRIX_COL_PINS { A2, B0, A7, A8, A13, A14, B12, B11, B10, B15, B14, B13 }
+#define UNUSED_PINS
+
+/* COL2ROW or ROW2COL */
+#define DIODE_DIRECTION COL2ROW
+
+/* Set 0 if debouncing isn't needed */
+// #define DEBOUNCE 5
+
+/* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
+// #define LOCKING_SUPPORT_ENABLE
+
+/* Locking resynchronize hack */
+// #define LOCKING_RESYNC_ENABLE
+
+/* prevent stuck modifiers */
+// #define PREVENT_STUCK_MODIFIERS
+
+/* RGB Underglow */
+#ifdef RGBLIGHT_ENABLE
+#define RGB_DI_PIN A15
+#define RGBLED_NUM 14
+#define RGBLIGHT_HUE_STEP 8
+#define RGBLIGHT_SAT_STEP 8
+#define RGBLIGHT_VAL_STEP 8
+#define RGBLIGHT_ANIMATIONS
+#endif
+
+/* Audio */
+#ifdef AUDIO_ENABLE
+#define STARTUP_SONG_DOOM SONG(E1M1_DOOM)
+#define STARTUP_SONG SONG( \
+    Q__NOTE(_E6), \
+    Q__NOTE(_A6), \
+    H__NOTE(_E7), \
+    Q__NOTE(_E6), \
+    Q__NOTE(_E7) \
+)
+#endif
+
+/* Encoders */
+#define ENCODERS_PAD_A { B3, A0 }
+#define ENCODERS_PAD_B { A6, A1 }
+/* #define ENCODER_RESOLUTION 4 */
+
+/* OLED */
+#define OLED_FONT_H "glcdfont_d48.c"
+#define OLED_TIMEOUT 0
+// #define OLED_SCROLL_TIMEOUT 1000
+
+/* Taps (encoder tap_code) */
+#define TAP_CODE_DELAY 10
+
+/* I2C */
+//#define I2C1_DUTY_CYCLE FAST_DUTY_CYCLE_2
+//#define PAL_MODE_STM32_ALTERNATE_OPENDRAIN (PAL_MODE_ALTERNATE(4) | PAL_STM32_OTYPE_OPENDRAIN)
+
+/* DS1307 */
+#define DS1307_ADDR (0x68 << 1)
diff --git a/keyboards/handwired/d48/d48.c b/keyboards/handwired/d48/d48.c
new file mode 100644
index 0000000000..3cc2097bf8
--- /dev/null
+++ b/keyboards/handwired/d48/d48.c
@@ -0,0 +1 @@
+#include "d48.h"
diff --git a/keyboards/handwired/d48/d48.h b/keyboards/handwired/d48/d48.h
new file mode 100644
index 0000000000..b698ca187f
--- /dev/null
+++ b/keyboards/handwired/d48/d48.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include "quantum.h"
+
+#define ___ KC_NO
+
+#define LAYOUT( \
+                                            K08,           K0B, \
+    K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B, \
+    K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B, \
+    K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B, \
+    K40, K41, K42, K43, K44, K45, K46, K47, K48, K49, K4A, K4B \
+) { \
+    { ___, ___, ___, ___, ___, ___, ___, ___, K08, ___, ___, K0B }, \
+    { K10, K11, K12, K13, K14, K15, K16, K17, K18, K19, K1A, K1B }, \
+    { K20, K21, K22, K23, K24, K25, K26, K27, K28, K29, K2A, K2B }, \
+    { K30, K31, K32, K33, K34, K35, K36, K37, K38, K39, K3A, K3B }, \
+    { K40, K41, K42, K43, K44, K45, K46, K47, K48, K49, K4A, K4B } \
+}
diff --git a/keyboards/handwired/d48/ds1307.c b/keyboards/handwired/d48/ds1307.c
new file mode 100644
index 0000000000..f6b57d50d2
--- /dev/null
+++ b/keyboards/handwired/d48/ds1307.c
@@ -0,0 +1,21 @@
+#include "ds1307.h"
+#include "i2c_master.h"
+
+void ds1307_set_time(uint8_t h, uint8_t m, uint8_t s) {
+    uint8_t data[] = {
+        ((s % 10) | ((s / 10) << 4)) & 0x7F,
+        ((m % 10) | ((m / 10) << 4)) & 0x7F,
+        ((h % 10) | ((h / 10) << 4)) & 0x3F,
+        0, 0, 0, 0, 0
+    }; // 24-hour mode
+    i2c_writeReg(DS1307_ADDR, 0, data, 8, 100);
+}
+
+void ds1307_get_time(uint8_t *h, uint8_t *m, uint8_t *s) {
+    uint8_t data[3];
+    i2c_readReg(DS1307_ADDR, 0, data, 3, 100);
+    i2c_stop();
+    *s = (data[0] & 0b1111) + ((data[0] & 0b1110000) >> 4) * 10;
+    *m = (data[1] & 0b1111) + ((data[1] & 0b1110000) >> 4) * 10;
+    *h = (data[2] & 0b1111) + ((data[2] & 0b0110000) >> 4) * 10;
+}
diff --git a/keyboards/handwired/d48/ds1307.h b/keyboards/handwired/d48/ds1307.h
new file mode 100644
index 0000000000..6f76db2508
--- /dev/null
+++ b/keyboards/handwired/d48/ds1307.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdint.h>
+
+void ds1307_set_time(uint8_t h, uint8_t m, uint8_t s);
+void ds1307_get_time(uint8_t *h, uint8_t *m, uint8_t *s);
diff --git a/keyboards/handwired/d48/glcdfont_d48.c b/keyboards/handwired/d48/glcdfont_d48.c
new file mode 100644
index 0000000000..19063b00ce
--- /dev/null
+++ b/keyboards/handwired/d48/glcdfont_d48.c
@@ -0,0 +1,231 @@
+#include "progmem.h"
+
+// Helidox 8x6 font with QMK Firmware Logo
+// Online editor: http://teripom.x0.com/
+
+static const unsigned char font[] PROGMEM = {
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x3E, 0x5B, 0x4F, 0x5B, 0x3E, 0x00,
+  0x3E, 0x6B, 0x4F, 0x6B, 0x3E, 0x00,
+  0x1C, 0x3E, 0x7C, 0x3E, 0x1C, 0x00,
+  0x18, 0x3C, 0x7E, 0x3C, 0x18, 0x00,
+  0x1C, 0x57, 0x7D, 0x57, 0x1C, 0x00,
+  0x1C, 0x5E, 0x7F, 0x5E, 0x1C, 0x00,
+  0x00, 0x00, 0x08, 0x08, 0x00, 0x00,
+  0xFF, 0xE7, 0xC3, 0xE7, 0xFF, 0x00,
+  0x00, 0x18, 0x24, 0x18, 0x00, 0x00,
+  0xFF, 0xE7, 0xDB, 0xE7, 0xFF, 0x00,
+  0x30, 0x48, 0x3A, 0x06, 0x0E, 0x00,
+  0x26, 0x29, 0x79, 0x29, 0x26, 0x00,
+  0x40, 0x7F, 0x05, 0x05, 0x07, 0x00,
+  0x40, 0x7F, 0x05, 0x25, 0x3F, 0x00,
+  0x5A, 0x3C, 0xE7, 0x3C, 0x5A, 0x00,
+  0x7F, 0x3E, 0x1C, 0x1C, 0x08, 0x00,
+  0x08, 0x1C, 0x1C, 0x3E, 0x7F, 0x00,
+  0x14, 0x22, 0x7F, 0x22, 0x14, 0x00,
+  0x5F, 0x5F, 0x00, 0x5F, 0x5F, 0x00,
+  0x06, 0x09, 0x7F, 0x01, 0x7F, 0x00,
+  0x00, 0x66, 0x89, 0x95, 0x6A, 0x00,
+  0x60, 0x60, 0x60, 0x60, 0x60, 0x00,
+  0x94, 0xA2, 0xFF, 0xA2, 0x94, 0x00,
+  0x08, 0x04, 0x7E, 0x04, 0x08, 0x00,
+  0x10, 0x20, 0x7E, 0x20, 0x10, 0x00,
+  0x08, 0x08, 0x2A, 0x1C, 0x08, 0x00,
+  0x08, 0x1C, 0x2A, 0x08, 0x08, 0x00,
+  0x1E, 0x10, 0x10, 0x10, 0x10, 0x00,
+  0x0C, 0x1E, 0x0C, 0x1E, 0x0C, 0x00,
+  0x30, 0x38, 0x3E, 0x38, 0x30, 0x00,
+  0x06, 0x0E, 0x3E, 0x0E, 0x06, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x5F, 0x00, 0x00, 0x00,
+  0x00, 0x07, 0x00, 0x07, 0x00, 0x00,
+  0x14, 0x7F, 0x14, 0x7F, 0x14, 0x00,
+  0x24, 0x2A, 0x7F, 0x2A, 0x12, 0x00,
+  0x23, 0x13, 0x08, 0x64, 0x62, 0x00,
+  0x36, 0x49, 0x56, 0x20, 0x50, 0x00,
+  0x00, 0x08, 0x07, 0x03, 0x00, 0x00,
+  0x00, 0x1C, 0x22, 0x41, 0x00, 0x00,
+  0x00, 0x41, 0x22, 0x1C, 0x00, 0x00,
+  0x2A, 0x1C, 0x7F, 0x1C, 0x2A, 0x00,
+  0x08, 0x08, 0x3E, 0x08, 0x08, 0x00,
+  0x00, 0x80, 0x70, 0x30, 0x00, 0x00,
+  0x08, 0x08, 0x08, 0x08, 0x08, 0x00,
+  0x00, 0x00, 0x60, 0x60, 0x00, 0x00,
+  0x20, 0x10, 0x08, 0x04, 0x02, 0x00,
+  0x3E, 0x51, 0x49, 0x45, 0x3E, 0x00,
+  0x00, 0x42, 0x7F, 0x40, 0x00, 0x00,
+  0x72, 0x49, 0x49, 0x49, 0x46, 0x00,
+  0x21, 0x41, 0x49, 0x4D, 0x33, 0x00,
+  0x18, 0x14, 0x12, 0x7F, 0x10, 0x00,
+  0x27, 0x45, 0x45, 0x45, 0x39, 0x00,
+  0x3C, 0x4A, 0x49, 0x49, 0x31, 0x00,
+  0x41, 0x21, 0x11, 0x09, 0x07, 0x00,
+  0x36, 0x49, 0x49, 0x49, 0x36, 0x00,
+  0x46, 0x49, 0x49, 0x29, 0x1E, 0x00,
+  0x00, 0x00, 0x14, 0x00, 0x00, 0x00,
+  0x00, 0x40, 0x34, 0x00, 0x00, 0x00,
+  0x00, 0x08, 0x14, 0x22, 0x41, 0x00,
+  0x14, 0x14, 0x14, 0x14, 0x14, 0x00,
+  0x00, 0x41, 0x22, 0x14, 0x08, 0x00,
+  0x02, 0x01, 0x59, 0x09, 0x06, 0x00,
+  0x3E, 0x41, 0x5D, 0x59, 0x4E, 0x00,
+  0x7C, 0x12, 0x11, 0x12, 0x7C, 0x00,
+  0x7F, 0x49, 0x49, 0x49, 0x36, 0x00,
+  0x3E, 0x41, 0x41, 0x41, 0x22, 0x00,
+  0x7F, 0x41, 0x41, 0x41, 0x3E, 0x00,
+  0x7F, 0x49, 0x49, 0x49, 0x41, 0x00,
+  0x7F, 0x09, 0x09, 0x09, 0x01, 0x00,
+  0x3E, 0x41, 0x41, 0x51, 0x73, 0x00,
+  0x7F, 0x08, 0x08, 0x08, 0x7F, 0x00,
+  0x00, 0x41, 0x7F, 0x41, 0x00, 0x00,
+  0x20, 0x40, 0x41, 0x3F, 0x01, 0x00,
+  0x7F, 0x08, 0x14, 0x22, 0x41, 0x00,
+  0x7F, 0x40, 0x40, 0x40, 0x40, 0x00,
+  0x7F, 0x02, 0x1C, 0x02, 0x7F, 0x00,
+  0x7F, 0x04, 0x08, 0x10, 0x7F, 0x00,
+  0x3E, 0x41, 0x41, 0x41, 0x3E, 0x00,
+  0x7F, 0x09, 0x09, 0x09, 0x06, 0x00,
+  0x3E, 0x41, 0x51, 0x21, 0x5E, 0x00,
+  0x7F, 0x09, 0x19, 0x29, 0x46, 0x00,
+  0x26, 0x49, 0x49, 0x49, 0x32, 0x00,
+  0x03, 0x01, 0x7F, 0x01, 0x03, 0x00,
+  0x3F, 0x40, 0x40, 0x40, 0x3F, 0x00,
+  0x1F, 0x20, 0x40, 0x20, 0x1F, 0x00,
+  0x3F, 0x40, 0x38, 0x40, 0x3F, 0x00,
+  0x63, 0x14, 0x08, 0x14, 0x63, 0x00,
+  0x03, 0x04, 0x78, 0x04, 0x03, 0x00,
+  0x61, 0x59, 0x49, 0x4D, 0x43, 0x00,
+  0x00, 0x7F, 0x41, 0x41, 0x41, 0x00,
+  0x02, 0x04, 0x08, 0x10, 0x20, 0x00,
+  0x00, 0x41, 0x41, 0x41, 0x7F, 0x00,
+  0x04, 0x02, 0x01, 0x02, 0x04, 0x00,
+  0x40, 0x40, 0x40, 0x40, 0x40, 0x00,
+  0x00, 0x03, 0x07, 0x08, 0x00, 0x00,
+  0x20, 0x54, 0x54, 0x78, 0x40, 0x00,
+  0x7F, 0x28, 0x44, 0x44, 0x38, 0x00,
+  0x38, 0x44, 0x44, 0x44, 0x28, 0x00,
+  0x38, 0x44, 0x44, 0x28, 0x7F, 0x00,
+  0x38, 0x54, 0x54, 0x54, 0x18, 0x00,
+  0x00, 0x08, 0x7E, 0x09, 0x02, 0x00,
+  0x18, 0xA4, 0xA4, 0x9C, 0x78, 0x00,
+  0x7F, 0x08, 0x04, 0x04, 0x78, 0x00,
+  0x00, 0x44, 0x7D, 0x40, 0x00, 0x00,
+  0x20, 0x40, 0x40, 0x3D, 0x00, 0x00,
+  0x7F, 0x10, 0x28, 0x44, 0x00, 0x00,
+  0x00, 0x41, 0x7F, 0x40, 0x00, 0x00,
+  0x7C, 0x04, 0x78, 0x04, 0x78, 0x00,
+  0x7C, 0x08, 0x04, 0x04, 0x78, 0x00,
+  0x38, 0x44, 0x44, 0x44, 0x38, 0x00,
+  0xFC, 0x18, 0x24, 0x24, 0x18, 0x00,
+  0x18, 0x24, 0x24, 0x18, 0xFC, 0x00,
+  0x7C, 0x08, 0x04, 0x04, 0x08, 0x00,
+  0x48, 0x54, 0x54, 0x54, 0x24, 0x00,
+  0x04, 0x04, 0x3F, 0x44, 0x24, 0x00,
+  0x3C, 0x40, 0x40, 0x20, 0x7C, 0x00,
+  0x1C, 0x20, 0x40, 0x20, 0x1C, 0x00,
+  0x3C, 0x40, 0x30, 0x40, 0x3C, 0x00,
+  0x44, 0x28, 0x10, 0x28, 0x44, 0x00,
+  0x4C, 0x90, 0x90, 0x90, 0x7C, 0x00,
+  0x44, 0x64, 0x54, 0x4C, 0x44, 0x00,
+  0x00, 0x08, 0x36, 0x41, 0x00, 0x00,
+  0x00, 0x00, 0x77, 0x00, 0x00, 0x00,
+  0x00, 0x41, 0x36, 0x08, 0x00, 0x00,
+  0x02, 0x01, 0x02, 0x04, 0x02, 0x00,
+  0x3C, 0x26, 0x23, 0x26, 0x3C, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x60, 0x70, 0x78, 0x3C,
+  0x1E, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0xE0,
+  0xFC, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC,
+  0xE0, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x07,
+  0x07, 0x07, 0x07, 0x07, 0x07, 0x0F,
+  0x1F, 0xFE, 0xFE, 0xF8, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xF0, 0xFC, 0xFE, 0xFE, 0x3F,
+  0x1F, 0x0F, 0x0F, 0x0F, 0x0F, 0x9F,
+  0xFF, 0xFE, 0xFE, 0xFC, 0xF0, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x3E, 0x22, 0x22, 0x00, 0x02, 0x3E,
+  0x02, 0x00, 0x3E, 0x20, 0x20, 0x00,
+  0x00, 0x3C, 0x0A, 0x3C, 0x00, 0x3E,
+  0x20, 0x20, 0x02, 0x3E, 0x02, 0x00,
+  0x00, 0x1C, 0x22, 0x32, 0x00, 0x1E,
+  0x20, 0x20, 0x1E, 0x00, 0x3E, 0x00,
+  0x00, 0x2C, 0x2A, 0x1A, 0x00, 0x3E,
+  0x0A, 0x02, 0x00, 0x02, 0x3E, 0x02,
+  0x00, 0x00, 0x08, 0x08, 0x08, 0x08,
+  0x08, 0x08, 0x08, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0xC0, 0xF8, 0xFF, 0xFF,
+  0xFF, 0xE7, 0xE0, 0xE0, 0xE7, 0xFF,
+  0xFF, 0xFF, 0xF8, 0xC0, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x3C,
+  0x3C, 0x3C, 0x3C, 0x3C, 0x3C, 0x7E,
+  0xFF, 0xE7, 0xE7, 0x81, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0,
+  0xF0, 0xF8, 0x7C, 0x3E, 0x1F, 0x0F,
+  0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x22, 0x22, 0x00, 0x00,
+  0x0F, 0x0F, 0x2F, 0x2F, 0x0F, 0x0F,
+  0xF0, 0xF0, 0xF2, 0xF2, 0xF0, 0xF0,
+  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+  0x00, 0x00, 0x22, 0x22, 0x00, 0xFF,
+  0x0F, 0x0F, 0x2F, 0x2F, 0x0F, 0xFF,
+  0xF0, 0xF0, 0xF2, 0xF2, 0xF0, 0xFF,
+  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xF0, 0xFE, 0xFF, 0xFF, 0x0F, 0x01,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x01, 0x0F, 0xFF, 0xFF, 0xFE, 0xF0,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xE0,
+  0xE0, 0xE0, 0xE0, 0xE0, 0xE0, 0xF0,
+  0xF8, 0x7F, 0x7F, 0x1F, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x0F, 0x3F, 0x7F, 0x7F, 0xFF,
+  0xF9, 0xF0, 0xF0, 0xF0, 0xF0, 0xF8,
+  0xFC, 0x7F, 0x7F, 0x3F, 0x0F, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F,
+  0xFF, 0xF1, 0xF1, 0xF1, 0xF1, 0xF1,
+  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+  0xFF, 0x11, 0x11, 0x11, 0x11, 0x11,
+};
diff --git a/keyboards/handwired/d48/keymaps/anderson/keymap.c b/keyboards/handwired/d48/keymaps/anderson/keymap.c
new file mode 100644
index 0000000000..25837a3591
--- /dev/null
+++ b/keyboards/handwired/d48/keymaps/anderson/keymap.c
@@ -0,0 +1,340 @@
+#include QMK_KEYBOARD_H
+#include "taphold.h"
+#include "seq.h"
+#include "ds1307.h"
+#include "lightmode.h"
+#include <stdio.h>
+
+/* Note: don't forget there's some more code in qmk_firmware/users/anderson dir */
+
+#define _MAIN 0
+#define _ALPHA 1
+#define _BETA 2
+
+enum custom_keycodes {
+    KC_MAIN = SAFE_RANGE,
+    KC_ALPHA,
+    KC_BETA,
+#ifdef LIGHTMODE_ENABLE
+    KC_LIGHT_MODE,
+#endif
+    KC_SEQ,
+    KC_SET_TIME,
+};
+#ifdef LIGHTMODE_ENABLE
+#endif
+
+/* TapHold is my own implementation of the `LT` macro. It's processed in `process_record_user()`. */
+#define TAPHOLD_CONFIG_SIZE 3
+taphold_t taphold_config[TAPHOLD_CONFIG_SIZE] = {
+    {.key=KC_ALPHA, .mode=TAPHOLD_LAYER, .shortAction=KC_ESC, .longAction=_ALPHA},
+    {.key=KC_BETA, .mode=TAPHOLD_LAYER, .shortAction=KC_EQL, .longAction=_BETA},
+    {.key=KC_RCTRL, .mode=TAPHOLD_MOD, .shortAction=KC_MINS, .longAction=KC_LCTRL},
+};
+uint16_t taphold_config_size = TAPHOLD_CONFIG_SIZE;
+uint32_t taphold_timeout = 90;
+
+/* Seq is implementation of unicode macros similar to UCIS, but with unicode strings. */
+#define SEQ_CONFIG_SIZE 3
+seq_t seq_config[SEQ_CONFIG_SIZE] = {
+    {.sequence="temp", .result="42°C"},
+    {.sequence="table", .result="┳━━┳"},
+    {.sequence="shrug", .result="¯\\_(ツ)_/¯"}
+};
+uint16_t seq_config_size = SEQ_CONFIG_SIZE;
+
+/* Colors */
+uint32_t layer_colors[3] = {
+    [_MAIN] = 0xFF0010,
+    [_ALPHA] = 0x4020FF,
+    [_BETA] = 0x20FF00,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Main layer
+                                                       │MUTE │           │L_MOD│
+       ┏━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┓
+       ┃ TAB ┃  Q  │  W  │  E  │  R  │  T  ┃  Y  │  U  │  I  │  O  │  P  ┃ BSP ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃𝛼/ESC┃  A  │  S  │  D  │  F  │  G  ┃  H  │  J  │  K  │  L  │  ;  ┃ RET ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃SHIFT┃  Z  │  X  │  C  │  V  │  B  ┃  N  │  M  │  ,  │  .  │  /  ┃CTL/-┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃LCTRL┃     │     │ ALT │ GUI │SPACE┃SPACE│ 𝛽/= │  '  │     │     ┃  \  ┃
+       ┗━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┛
+       */
+    [_MAIN] = LAYOUT( \
+                                                                                KC_MUTE,                   LCTL(KC_D),
+        KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC, \
+        KC_ALPHA,KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_ENT,  \
+        KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RCTRL,\
+        KC_LCTRL,_______, _______, KC_LALT, KC_LGUI, KC_SPC,  KC_SPC,  KC_BETA, KC_QUOT, _______, _______, KC_BSLS  \
+    ),
+
+    /* Alpha layer (𝛼)
+                                                       │     │           │     │
+       ┏━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┓
+       ┃     ┃PREV │PLAY │NEXT │     │NUMLK┃  -  │ ^^^ │  ^  │ vvv │  ~  ┃ DEL ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │VOL -│VOL +│     │CPSLK┃HOME │ <-- │  v  │ --> │  `  ┃  \  ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │     │     │     │SCRLK┃ END │  =  │  [  │  ]  │  (  ┃  )  ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │     │     │     │     ┃     │     │     │     │     ┃     ┃
+       ┗━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┛
+       */
+    [_ALPHA] = LAYOUT( \
+                                                                                _______,                   _______, \
+        _______, KC_MPRV, KC_MPLY, KC_MNXT, _______, KC_NLCK, KC_MINS, KC_PGUP, KC_UP,   KC_PGDN, KC_TILD, KC_DEL,  \
+        _______, _______, KC_VOLD, KC_VOLU, _______, KC_CAPS, KC_HOME, KC_LEFT, KC_DOWN, KC_RIGHT,KC_GRV,  KC_BSLS, \
+        _______, _______, _______, _______, _______, KC_SLCK, KC_END,  KC_EQL,  KC_LBRC, KC_RBRC, KC_LPRN ,KC_RPRN, \
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______  \
+    ),
+
+    /* Beta layer (𝛽)
+                                                       │     │           │     │
+       ┏━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┓
+       ┃ RGB ┃  1  │  2  │  3  │  4  │  5  ┃  6  │  7  │  8  │  9  │  0  ┃ F12 ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃L_MOD┃ F1  │ F2  │ F3  │ F4  │ F5  ┃ F6  │ F7  │ F8  │ F9  │ F10 ┃ F11 ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃RESET│DEBUG│     │     │TIME ┃SLEEP│ SEQ │  {  │  }  │PTSCR┃     ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │     │     │     │     ┃     │     │     │     │     ┃     ┃
+       ┗━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┛
+       */
+    [_BETA] = LAYOUT( \
+                                                                                _______,                   _______, \
+        RGB_TOG, KC_1,  KC_2,    KC_3,   KC_4,    KC_5,     KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_F12,
+#ifdef LIGHTMODE_ENABLE
+        KC_LIGHT_MODE,
+#else
+        _______,
+#endif
+                 KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  \
+        _______, RESET,   DEBUG,   _______, _______, KC_SET_TIME,KC_SLEP,KC_SEQ,KC_LCBR, KC_RCBR, KC_PSCR, _______, \
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______  \
+    )
+};
+
+static bool alpha_pressed = false;
+static bool beta_pressed = false;
+
+static bool ctrl_pressed = false;
+static bool alt_pressed = false;
+static bool shift_pressed = false;
+static bool gui_pressed = false;
+
+static bool is_in_seq = false;
+
+void keyboard_post_init_user(void) {
+    /* debug_enable = true; */
+    /* debug_matrix = true; */
+}
+
+void eeconfig_init_user(void) {
+    set_unicode_input_mode(UC_LNX);
+}
+
+void matrix_init_user(void) {
+#ifdef LIGHTMODE_ENABLE
+    set_light_mode(SMOOTHLED, layer_colors[_MAIN]);
+#endif
+}
+
+static uint32_t last_update = 0;
+static uint8_t hours, minutes, seconds;
+
+void matrix_scan_user(void) {
+    uint32_t now = timer_read32();
+    if (now - last_update > 500) {
+        ds1307_get_time(&hours, &minutes, &seconds);
+        last_update = now;
+    }
+}
+
+static bool is_in_set_time = false;
+static char new_time[6];
+static uint8_t new_time_index = 0;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (keycode == KC_SEQ && record->event.pressed) {
+        seq_start();
+        layer_off(_BETA);
+        is_in_seq = true;
+        return false;
+    } else if (is_in_seq) {
+        if (record->event.pressed) {
+            if (!seq_feed(keycode)) {
+                is_in_seq = false;
+            }
+        }
+        return false;
+    }
+    if (keycode == KC_SET_TIME && record->event.pressed) {
+        is_in_set_time = true;
+        new_time_index = 0;
+    } else if (is_in_set_time) {
+        if (!record->event.pressed && keycode >= KC_1 && keycode <= KC_0) {
+            new_time[new_time_index++] = (keycode == KC_0) ? 0 : keycode - KC_1 + 1;
+            if (new_time_index == 6) {
+                is_in_set_time = false;
+                ds1307_set_time(
+                        (new_time[0]) * 10 + (new_time[1]),
+                        (new_time[2]) * 10 + (new_time[3]),
+                        (new_time[4]) * 10 + (new_time[5])
+                );
+                for (int i = 0; i < 6; i++) {
+                    tap_code(KC_BSPACE);
+                }
+            }
+        }
+    }
+
+    if (keycode == KC_LCTRL || keycode == KC_RCTRL) {
+        ctrl_pressed = record->event.pressed;
+    } else if (keycode == KC_LALT) {
+        alt_pressed = record->event.pressed;
+    } else if (keycode == KC_LSFT) {
+        shift_pressed = record->event.pressed;
+    } else if (keycode == KC_LGUI) {
+        gui_pressed = record->event.pressed;
+    } else if (keycode == KC_ALPHA) {
+        alpha_pressed = record->event.pressed;
+    } else if (keycode == KC_BETA) {
+        beta_pressed = record->event.pressed;
+    }
+
+    if (keycode == RESET) {
+        rgblight_setrgb(255, 255, 0);
+    }
+#ifdef LIGHTMODE_ENABLE
+    if (record->event.pressed && keycode == KC_LIGHT_MODE) {
+        next_light_mode(layer_colors[_MAIN]);
+    }
+#endif
+    if (keycode == KC_LCTRL) {
+        /* Some Overlay1_Enable fuckery! */
+        (record->event.pressed ? register_code : unregister_code)(KC_LCTRL);
+        return false;
+    }
+    return taphold_process(keycode, record);
+}
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+#ifdef LIGHTMODE_ENABLE
+    uint8_t layer = get_highest_layer(state);
+    update_light_mode(layer_colors[layer]);
+#endif
+    return state;
+}
+
+void encoder_update_user(uint8_t index, bool clockwise) {
+    if (index == 0) {
+        if (!alpha_pressed) {
+            tap_code(clockwise ? KC_VOLD : KC_VOLU);
+        } else {
+            tap_code(clockwise ? KC_MPRV : KC_MNXT);
+        }
+    } else if (index == 1) {
+        if (!alpha_pressed) {
+            tap_code(clockwise ? KC_UP : KC_DOWN);
+        } else {
+            tap_code(clockwise ? KC_PGUP : KC_PGDN);
+        }
+    }
+}
+
+#ifdef OLED_DRIVER_ENABLE
+oled_rotation_t oled_init_user(oled_rotation_t rotation) {
+    return OLED_ROTATION_0;
+}
+
+void oled_task_user(void) {
+    /* Host Keyboard Layer Status */
+    uint8_t current_layer = get_highest_layer(layer_state);
+
+    /* Layer */
+    static const char PROGMEM icons[4][3][6] = {
+        {
+            { 0x80, 0x81, 0x82, 0x83, 0x84, 0 },
+            { 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0 },
+            { 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0 }
+        },
+        {
+            { 0x85, 0x86, 0x87, 0x88, 0x89, 0 },
+            { 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0 },
+            { 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0 }
+        },
+        {
+            { 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0 },
+            { 0xaa, 0xab, 0xac, 0xad, 0xae, 0 },
+            { 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0 }
+        },
+        {
+            { 0x8f, 0x90, 0x91, 0x92, 0x93, 0 },
+            { 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0 },
+            { 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0 }
+        }
+    };
+
+    uint8_t icon_index = current_layer == _MAIN ? 3 : current_layer == _ALPHA ? 1 : 2;
+    for (int i = 0; i < 3; i++) {
+        oled_set_cursor(0, i + 1);
+        oled_write_P(icons[icon_index][i], false);
+    }
+
+    /* Time */
+    oled_set_cursor(6, 0);
+    // oled_write_P(PSTR("-D48 Custom-\n"), false);
+    char buf[16];
+    sprintf(
+            buf,
+            "%02d:%02d:%02d", hours, minutes, seconds
+    );
+    oled_write(buf, false);
+
+    /* Modifiers */
+    static const char PROGMEM mods[][2] = {
+        {0x94, 0x95}, // CTL
+        {0x96, 0x97}, // ALT
+        {0x98, 0x99}, // GUI
+        {0x9a, 0x9b},  // SFT
+        /* {0x9c, 0x9d},  // EMPTY */
+    };
+
+    char mod_data[13] = "\x9c\x9d\x9c\x9d\x9c\x9d\x9c\x9d \x07\x07\x07\0";
+    if (ctrl_pressed) strncpy(mod_data, mods[0], 2);
+    if (alt_pressed) strncpy(mod_data + 2, mods[1], 2);
+    if (gui_pressed) strncpy(mod_data + 4, mods[2], 2);
+    if (shift_pressed) strncpy(mod_data + 6, mods[3], 2);
+    led_t led_usb_state = host_keyboard_led_state();
+    if (led_usb_state.num_lock) mod_data[9] = 'N';
+    if (led_usb_state.caps_lock) mod_data[10] = 'C';
+    if (led_usb_state.scroll_lock) mod_data[11] = 'S';
+
+    oled_set_cursor(6, 1);
+    oled_write(mod_data, false);
+
+    /* Matrix */
+    static const char PROGMEM matrix_chars[] = {
+        0xb4, // None
+        0xb5, // Upper
+        0xb6, // Lower
+        0xb7  // Both
+    };
+
+    for (uint8_t row = 1; row < MATRIX_ROWS; row += 2) {
+        // Skip first row because it's used by the encoders.
+        uint16_t bits1 = matrix_get_row(row);
+        uint16_t bits2 = matrix_get_row(row + 1);
+
+        for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+            uint8_t matrix_char = matrix_chars[((bits1 & (1 << col)) ? 1 : 0) | ((bits2 & (1 << col)) ? 2 : 0)];
+            oled_set_cursor(6 + col, 2 + (row - 1) / 2);
+            oled_write_char(matrix_char, false);
+        }
+    }
+
+}
+#endif
diff --git a/keyboards/handwired/d48/keymaps/anderson/lightmode.c b/keyboards/handwired/d48/keymaps/anderson/lightmode.c
new file mode 100644
index 0000000000..bc05956214
--- /dev/null
+++ b/keyboards/handwired/d48/keymaps/anderson/lightmode.c
@@ -0,0 +1,44 @@
+#include "lightmode.h"
+
+#ifdef LIGHTMODE_ENABLE
+
+/* Light modes switcher */
+
+uint8_t light_mode = SMOOTHLED;
+
+void set_light_mode(light_mode_t value, uint32_t color) {
+    light_mode = value;
+    if (light_mode == SMOOTHLED) {
+        smoothled_set(color);
+    } else {
+        dmc12_start(color, true);
+    }
+}
+
+void process_light_mode(void) {
+    if (light_mode == SMOOTHLED) {
+        smoothled_process();
+    } else {
+        dmc12_process();
+    }
+}
+
+void update_light_mode(uint32_t color) {
+    if (light_mode == SMOOTHLED) {
+        smoothled_set(color);
+    } else {
+        dmc12_start(color, false);
+    }
+}
+
+void next_light_mode(uint32_t color) {
+    light_mode = (light_mode + 1) % LIGHT_MODE_SIZE;
+    set_light_mode(light_mode, color);
+}
+
+void matrix_scan_kb(void) {
+    process_light_mode();
+    matrix_scan_user();
+}
+
+#endif
diff --git a/keyboards/handwired/d48/keymaps/anderson/lightmode.h b/keyboards/handwired/d48/keymaps/anderson/lightmode.h
new file mode 100644
index 0000000000..0c81e476bb
--- /dev/null
+++ b/keyboards/handwired/d48/keymaps/anderson/lightmode.h
@@ -0,0 +1,12 @@
+#include "smoothled.h"
+#include "dmc12.h"
+#include "quantum.h"
+
+/* Light modes */
+enum light_mode_enum { SMOOTHLED, DMC12, LIGHT_MODE_SIZE };
+typedef enum light_mode_enum light_mode_t;
+
+void set_light_mode(light_mode_t value, uint32_t color);
+void process_light_mode(void);
+void update_light_mode(uint32_t color);
+void next_light_mode(uint32_t color);
diff --git a/keyboards/handwired/d48/keymaps/anderson/rules.mk b/keyboards/handwired/d48/keymaps/anderson/rules.mk
new file mode 100644
index 0000000000..e925b9a89f
--- /dev/null
+++ b/keyboards/handwired/d48/keymaps/anderson/rules.mk
@@ -0,0 +1,2 @@
+OPT_DEFS += -DLIGHTMODE_ENABLE
+SRC += smoothled.c dmc12.c seq.c lightmode.c
diff --git a/keyboards/handwired/d48/keymaps/default/keymap.c b/keyboards/handwired/d48/keymaps/default/keymap.c
new file mode 100644
index 0000000000..b7914f3bcd
--- /dev/null
+++ b/keyboards/handwired/d48/keymaps/default/keymap.c
@@ -0,0 +1,285 @@
+#include QMK_KEYBOARD_H
+#include <string.h>
+#include <stdio.h>
+#include "taphold.h"
+#include "ds1307.h"
+
+/* Note: don't forget there's some more code in qmk_firmware/users/anderson dir */
+
+#define _MAIN 0
+#define _ALPHA 1
+#define _BETA 2
+
+enum custom_keycodes {
+    KC_MAIN = SAFE_RANGE,
+    KC_ALPHA,
+    KC_BETA,
+    KC_SET_TIME,
+};
+
+/* TapHold is my own implementation of the `LT` macro. It's processed in `process_record_user()`. */
+#define TAPHOLD_CONFIG_SIZE 3
+taphold_t taphold_config[TAPHOLD_CONFIG_SIZE] = {
+    {.key=KC_ALPHA, .mode=TAPHOLD_LAYER, .shortAction=KC_ESC, .longAction=_ALPHA},
+    {.key=KC_BETA, .mode=TAPHOLD_LAYER, .shortAction=KC_EQL, .longAction=_BETA},
+    {.key=KC_RCTRL, .mode=TAPHOLD_MOD, .shortAction=KC_MINS, .longAction=KC_LCTRL},
+};
+uint16_t taphold_config_size = TAPHOLD_CONFIG_SIZE;
+uint32_t taphold_timeout = 90;
+
+/* Colors */
+uint32_t layer_colors[3] = {
+    [_MAIN] = 0xFF0010,
+    [_ALPHA] = 0x4020FF,
+    [_BETA] = 0x20FF00,
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    /* Main layer
+                                                       │MUTE │           │L_MOD│
+       ┏━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┓
+       ┃ TAB ┃  Q  │  W  │  E  │  R  │  T  ┃  Y  │  U  │  I  │  O  │  P  ┃ BSP ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃𝛼/ESC┃  A  │  S  │  D  │  F  │  G  ┃  H  │  J  │  K  │  L  │  ;  ┃ RET ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃SHIFT┃  Z  │  X  │  C  │  V  │  B  ┃  N  │  M  │  ,  │  .  │  /  ┃CTL/-┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃LCTRL┃     │     │ ALT │ GUI │SPACE┃SPACE│ 𝛽/= │  '  │     │     ┃  \  ┃
+       ┗━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┛
+       */
+    [_MAIN] = LAYOUT( \
+                                                                                KC_MUTE,                   _______, \
+        KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,    KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_BSPC, \
+        KC_ALPHA,KC_A,    KC_S,    KC_D,    KC_F,    KC_G,    KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_ENT,  \
+        KC_LSFT, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,    KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RCTRL,\
+        KC_LCTRL,_______, _______, KC_LALT, KC_LGUI, KC_SPC,  KC_SPC,  KC_BETA, KC_QUOT, _______, _______, KC_BSLS  \
+    ),
+
+    /* Alpha layer (𝛼)
+                                                       │     │           │     │
+       ┏━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┓
+       ┃     ┃PREV │PLAY │NEXT │     │NUMLK┃  -  │ ^^^ │  ^  │ vvv │  ~  ┃ DEL ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │VOL -│VOL +│     │CPSLK┃HOME │ <-- │  v  │ --> │  `  ┃  \  ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │     │     │     │SCRLK┃ END │  =  │  [  │  ]  │  (  ┃  )  ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │     │     │     │     ┃     │     │     │     │     ┃     ┃
+       ┗━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┛
+       */
+    [_ALPHA] = LAYOUT( \
+                                                                                _______,                   _______, \
+        _______, KC_MPRV, KC_MPLY, KC_MNXT, _______, KC_NLCK, KC_MINS, KC_PGUP, KC_UP,   KC_PGDN, KC_TILD, KC_DEL,  \
+        _______, _______, KC_VOLD, KC_VOLU, _______, KC_CAPS, KC_HOME, KC_LEFT, KC_DOWN, KC_RIGHT,KC_GRV,  KC_BSLS, \
+        _______, _______, _______, _______, _______, KC_SLCK, KC_END,  KC_EQL,  KC_LBRC, KC_RBRC, KC_LPRN ,KC_RPRN, \
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______  \
+    ),
+
+    /* Beta layer (𝛽)
+                                                       │     │           │     │
+       ┏━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┯━━━━━┯━━━━━┯━━━━━┯━━━━━┳━━━━━┓
+       ┃ RGB ┃  1  │  2  │  3  │  4  │  5  ┃  6  │  7  │  8  │  9  │  0  ┃ F12 ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃L_MOD┃ F1  │ F2  │ F3  │ F4  │ F5  ┃ F6  │ F7  │ F8  │ F9  │ F10 ┃ F11 ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃RESET│DEBUG│     │     │TIME ┃SLEEP│     │  {  │  }  │PTSCR┃     ┃
+       ┣━━━━━╉─────┼─────┼─────┼─────┼─────╂─────┼─────┼─────┼─────┼─────╊━━━━━┫
+       ┃     ┃     │     │     │     │     ┃     │     │     │     │     ┃     ┃
+       ┗━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┷━━━━━┷━━━━━┷━━━━━┷━━━━━┻━━━━━┛
+       */
+    [_BETA] = LAYOUT( \
+                                                                                _______,                   _______, \
+        RGB_TOG, KC_1,    KC_2,    KC_3,    KC_4,    KC_5,     KC_6,    KC_7,   KC_8,    KC_9,    KC_0,    KC_F12,
+        _______, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,    KC_F6,  KC_F7,   KC_F8,   KC_F9,   KC_F10,  KC_F11,  \
+        _______, RESET,   DEBUG,   _______, _______, KC_SET_TIME,KC_SLEP,_______,KC_LCBR,KC_RCBR, KC_PSCR, _______, \
+        _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______ \
+    )
+};
+
+static bool alpha_pressed = false;
+static bool beta_pressed = false;
+
+static bool ctrl_pressed = false;
+static bool alt_pressed = false;
+static bool shift_pressed = false;
+static bool gui_pressed = false;
+
+void keyboard_post_init_user(void) {
+    /* debug_enable = true; */
+    /* debug_matrix = true; */
+}
+
+void eeconfig_init_user(void) {
+    set_unicode_input_mode(UC_LNX);
+}
+
+static uint32_t last_update = 0;
+static uint8_t hours, minutes, seconds;
+
+void matrix_scan_user(void) {
+    uint32_t now = timer_read32();
+    if (now - last_update > 500) {
+        ds1307_get_time(&hours, &minutes, &seconds);
+        last_update = now;
+    }
+}
+
+static bool is_in_set_time = false;
+static char new_time[6];
+static uint8_t new_time_index = 0;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+    if (keycode == KC_SET_TIME && record->event.pressed) {
+        is_in_set_time = true;
+        new_time_index = 0;
+    } else if (is_in_set_time) {
+        if (!record->event.pressed && keycode >= KC_1 && keycode <= KC_0) {
+            new_time[new_time_index++] = (keycode == KC_0) ? 0 : keycode - KC_1 + 1;
+            if (new_time_index == 6) {
+                is_in_set_time = false;
+                ds1307_set_time(
+                        (new_time[0]) * 10 + (new_time[1]),
+                        (new_time[2]) * 10 + (new_time[3]),
+                        (new_time[4]) * 10 + (new_time[5])
+                );
+                for (int i = 0; i < 6; i++) {
+                    tap_code(KC_BSPACE);
+                }
+            }
+        }
+    }
+
+    if (keycode == KC_LCTRL || keycode == KC_RCTRL) {
+        ctrl_pressed = record->event.pressed;
+    } else if (keycode == KC_LALT) {
+        alt_pressed = record->event.pressed;
+    } else if (keycode == KC_LSFT) {
+        shift_pressed = record->event.pressed;
+    } else if (keycode == KC_LGUI) {
+        gui_pressed = record->event.pressed;
+    } else if (keycode == KC_ALPHA) {
+        alpha_pressed = record->event.pressed;
+    } else if (keycode == KC_BETA) {
+        beta_pressed = record->event.pressed;
+    }
+
+    if (keycode == RESET) {
+        rgblight_setrgb(255, 255, 0);
+    }
+    if (keycode == KC_LCTRL) {
+        /* Some Overlay1_Enable fuckery! */
+        (record->event.pressed ? register_code : unregister_code)(KC_LCTRL);
+        return false;
+    }
+    return taphold_process(keycode, record);
+}
+
+void encoder_update_user(uint8_t index, bool clockwise) {
+    if (index == 0) {
+        if (!alpha_pressed) {
+            tap_code(clockwise ? KC_VOLD : KC_VOLU);
+        } else {
+            tap_code(clockwise ? KC_MPRV : KC_MNXT);
+        }
+    } else if (index == 1) {
+        if (!alpha_pressed) {
+            tap_code(clockwise ? KC_UP : KC_DOWN);
+        } else {
+            tap_code(clockwise ? KC_PGUP : KC_PGDN);
+        }
+    }
+}
+
+#ifdef OLED_DRIVER_ENABLE
+oled_rotation_t oled_init_user(oled_rotation_t rotation) {
+    return OLED_ROTATION_0;
+}
+
+void oled_task_user(void) {
+    /* Host Keyboard Layer Status */
+    uint8_t current_layer = get_highest_layer(layer_state);
+
+    /* Layer */
+    static const char PROGMEM icons[4][3][6] = {
+        {
+            { 0x80, 0x81, 0x82, 0x83, 0x84, 0 },
+            { 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0 },
+            { 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0 }
+        },
+        {
+            { 0x85, 0x86, 0x87, 0x88, 0x89, 0 },
+            { 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0 },
+            { 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0 }
+        },
+        {
+            { 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0 },
+            { 0xaa, 0xab, 0xac, 0xad, 0xae, 0 },
+            { 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0 }
+        },
+        {
+            { 0x8f, 0x90, 0x91, 0x92, 0x93, 0 },
+            { 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0 },
+            { 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0 }
+        }
+    };
+
+    uint8_t icon_index = current_layer == _MAIN ? 3 : current_layer == _ALPHA ? 1 : 2;
+    for (int i = 0; i < 3; i++) {
+        oled_set_cursor(0, i + 1);
+        oled_write_P(icons[icon_index][i], false);
+    }
+
+    /* Time */
+    oled_set_cursor(6, 0);
+    // oled_write_P(PSTR("-D48 Custom-\n"), false);
+    char buf[16];
+    sprintf(
+            buf,
+            "%02d:%02d:%02d", hours, minutes, seconds
+    );
+    oled_write(buf, false);
+
+    /* Modifiers */
+    static const char PROGMEM mods[][2] = {
+        {0x94, 0x95}, // CTL
+        {0x96, 0x97}, // ALT
+        {0x98, 0x99}, // GUI
+        {0x9a, 0x9b},  // SFT
+        /* {0x9c, 0x9d},  // EMPTY */
+    };
+
+    char mod_data[13] = "\x9c\x9d\x9c\x9d\x9c\x9d\x9c\x9d \x07\x07\x07\0";
+    if (ctrl_pressed) strncpy(mod_data, mods[0], 2);
+    if (alt_pressed) strncpy(mod_data + 2, mods[1], 2);
+    if (gui_pressed) strncpy(mod_data + 4, mods[2], 2);
+    if (shift_pressed) strncpy(mod_data + 6, mods[3], 2);
+    led_t led_usb_state = host_keyboard_led_state();
+    if (led_usb_state.num_lock) mod_data[9] = 'N';
+    if (led_usb_state.caps_lock) mod_data[10] = 'C';
+    if (led_usb_state.scroll_lock) mod_data[11] = 'S';
+
+    oled_set_cursor(6, 1);
+    oled_write(mod_data, false);
+
+    /* Matrix */
+    static const char PROGMEM matrix_chars[] = {
+        0xb4, // None
+        0xb5, // Upper
+        0xb6, // Lower
+        0xb7  // Both
+    };
+
+    for (uint8_t row = 1; row < MATRIX_ROWS; row += 2) {
+        // Skip first row because it's used by the encoders.
+        uint16_t bits1 = matrix_get_row(row);
+        uint16_t bits2 = matrix_get_row(row + 1);
+
+        for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+            uint8_t matrix_char = matrix_chars[((bits1 & (1 << col)) ? 1 : 0) | ((bits2 & (1 << col)) ? 2 : 0)];
+            oled_set_cursor(6 + col, 2 + (row - 1) / 2);
+            oled_write_char(matrix_char, false);
+        }
+    }
+
+}
+#endif
diff --git a/keyboards/handwired/d48/rules.mk b/keyboards/handwired/d48/rules.mk
new file mode 100644
index 0000000000..57c83694e1
--- /dev/null
+++ b/keyboards/handwired/d48/rules.mk
@@ -0,0 +1,22 @@
+# MCU name
+MCU = STM32F303
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no   # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no    # Mouse keys
+EXTRAKEY_ENABLE = yes   # Audio control and System control
+CONSOLE_ENABLE = yes    # Console for debug
+COMMAND_ENABLE = no     # Commands for debug and configuration
+SLEEP_LED_ENABLE = no   # Breathing sleep LED during USB suspend
+NKRO_ENABLE = yes       # USB Nkey Rollover - if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
+BACKLIGHT_ENABLE = no   # Enable keyboard backlight functionality
+AUDIO_ENABLE = yes
+USE_I2C = no
+RGBLIGHT_ENABLE = yes
+ENCODER_ENABLE = yes
+OLED_DRIVER_ENABLE = yes
+UNICODE_ENABLE = yes
+
+SRC += ds1307.c taphold.c
diff --git a/keyboards/handwired/d48/taphold.c b/keyboards/handwired/d48/taphold.c
new file mode 100644
index 0000000000..0b56a5a6a1
--- /dev/null
+++ b/keyboards/handwired/d48/taphold.c
@@ -0,0 +1,29 @@
+#include "taphold.h"
+
+bool taphold_process(uint16_t keycode, keyrecord_t *record) {
+    for (int i = 0; i < taphold_config_size; i++) {
+        taphold_t *config = &taphold_config[i];
+        if (config->key == keycode && record->event.pressed) {
+            if (config->mode == TAPHOLD_LAYER) {
+                layer_on(config->longAction);
+            } else {
+                register_code(config->longAction);
+            }
+            config->time = timer_read32();
+            config->keypos = record->event.key;
+            return false;
+        } else if (KEYEQ(record->event.key, config->keypos) && !record->event.pressed) {
+            if (config->mode == TAPHOLD_LAYER) {
+                layer_off(config->longAction);
+            } else {
+                unregister_code(config->longAction);
+            }
+            if (timer_elapsed32(config->time) < taphold_timeout) {
+                tap_code(config->shortAction);
+            }
+            config->keypos.row = 255;
+            return false;
+        }
+    }
+    return true;
+}
diff --git a/keyboards/handwired/d48/taphold.h b/keyboards/handwired/d48/taphold.h
new file mode 100644
index 0000000000..3bc5ca0275
--- /dev/null
+++ b/keyboards/handwired/d48/taphold.h
@@ -0,0 +1,25 @@
+#include "quantum.h"
+
+typedef enum taphold_mode_t {
+    TAPHOLD_LAYER,
+    TAPHOLD_MOD
+} taphold_mode_t;
+
+typedef struct taphold_t {
+    uint16_t key;
+    uint32_t time;
+    taphold_mode_t mode;
+    uint16_t shortAction;
+    uint16_t longAction;
+    keypos_t keypos;
+    // We store key pos to properly release the key
+    // even when a different layer is active and the key has a different action now
+} taphold_t;
+
+extern taphold_t taphold_config[];
+extern uint16_t taphold_config_size;
+// Dual keys tap/hold timeout.
+// If key is tapped for less than this value, send key in addition to primary action after completing the action.
+extern uint32_t taphold_timeout;
+
+bool taphold_process(uint16_t keycode, keyrecord_t *record);