diff options
Diffstat (limited to 'drivers/sensors/pmw3360.c')
| -rw-r--r-- | drivers/sensors/pmw3360.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/sensors/pmw3360.c b/drivers/sensors/pmw3360.c new file mode 100644 index 0000000000..91ee87b957 --- /dev/null +++ b/drivers/sensors/pmw3360.c @@ -0,0 +1,237 @@ +/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com> + * Copyright 2019 Sunjun Kim + * Copyright 2020 Ploopy Corporation + * + * 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 "debug.h" +#include "print.h" +#include "pmw3360.h" +#include "pmw3360_firmware.h" + +bool _inBurst = false; + +#ifndef PMW_CPI +# define PMW_CPI 1600 +#endif +#ifndef PMW_CLOCK_SPEED +# define PMW_CLOCK_SPEED 70000000 +#endif +#ifndef SPI_MODE +# define SPI_MODE 3 +#endif +#ifndef SPI_DIVISOR +# define SPI_DIVISOR (F_CPU / PMW_CLOCK_SPEED) +#endif +#ifndef ROTATIONAL_TRANSFORM_ANGLE +# define ROTATIONAL_TRANSFORM_ANGLE 0x00 +#endif +#ifndef PMW_CS_PIN +# define PMW_CS_PIN SPI_SS_PIN +#endif + +void print_byte(uint8_t byte) { dprintf("%c%c%c%c%c%c%c%c|", (byte & 0x80 ? '1' : '0'), (byte & 0x40 ? '1' : '0'), (byte & 0x20 ? '1' : '0'), (byte & 0x10 ? '1' : '0'), (byte & 0x08 ? '1' : '0'), (byte & 0x04 ? '1' : '0'), (byte & 0x02 ? '1' : '0'), (byte & 0x01 ? '1' : '0')); } + +bool spi_start_adv(void) { + bool status = spi_start(PMW_CS_PIN, false, SPI_MODE, SPI_DIVISOR); + wait_us(1); + return status; +} + +void spi_stop_adv(void) { + wait_us(1); + spi_stop(); +} + +spi_status_t spi_write_adv(uint8_t reg_addr, uint8_t data) { + if (reg_addr != REG_Motion_Burst) { + _inBurst = false; + } + + spi_start_adv(); + // send address of the register, with MSBit = 1 to indicate it's a write + spi_status_t status = spi_write(reg_addr | 0x80); + status = spi_write(data); + + // tSCLK-NCS for write operation + wait_us(20); + + // tSWW/tSWR (=120us) minus tSCLK-NCS. Could be shortened, but is looks like a safe lower bound + wait_us(100); + spi_stop(); + return status; +} + +uint8_t spi_read_adv(uint8_t reg_addr) { + spi_start_adv(); + // send adress of the register, with MSBit = 0 to indicate it's a read + spi_write(reg_addr & 0x7f); + + uint8_t data = spi_read(); + + // tSCLK-NCS for read operation is 120ns + wait_us(1); + + // tSRW/tSRR (=20us) minus tSCLK-NCS + wait_us(19); + + spi_stop(); + return data; +} + +void pmw_set_cpi(uint16_t cpi) { + uint8_t cpival = constrain((cpi / 100) - 1, 0, 0x77); // limits to 0--119 + + spi_start_adv(); + spi_write_adv(REG_Config1, cpival); + spi_stop(); +} + +uint16_t pmw_get_cpi(void) { + uint8_t cpival = spi_read_adv(REG_Config1); + return (uint16_t)(cpival & 0xFF) * 100; +} + +bool pmw_spi_init(void) { + setPinOutput(PMW_CS_PIN); + + spi_init(); + _inBurst = false; + + spi_stop(); + spi_start_adv(); + spi_stop(); + + spi_write_adv(REG_Shutdown, 0xb6); // Shutdown first + wait_ms(300); + + spi_start_adv(); + wait_us(40); + spi_stop_adv(); + wait_us(40); + + spi_write_adv(REG_Power_Up_Reset, 0x5a); + wait_ms(50); + + spi_read_adv(REG_Motion); + spi_read_adv(REG_Delta_X_L); + spi_read_adv(REG_Delta_X_H); + spi_read_adv(REG_Delta_Y_L); + spi_read_adv(REG_Delta_Y_H); + + pmw_upload_firmware(); + + spi_stop_adv(); + + wait_ms(10); + pmw_set_cpi(PMW_CPI); + + wait_ms(1); + + spi_write_adv(REG_Config2, 0x00); + + spi_write_adv(REG_Angle_Tune, constrain(ROTATIONAL_TRANSFORM_ANGLE, -30, 30)); + + bool init_success = pmw_check_signature(); + + writePinLow(PMW_CS_PIN); + + return init_success; +} + +void pmw_upload_firmware(void) { + spi_write_adv(REG_SROM_Enable, 0x1d); + + wait_ms(10); + + spi_write_adv(REG_SROM_Enable, 0x18); + + spi_start_adv(); + spi_write(REG_SROM_Load_Burst | 0x80); + wait_us(15); + + unsigned char c; + for (int i = 0; i < firmware_length; i++) { + c = (unsigned char)pgm_read_byte(firmware_data + i); + spi_write(c); + wait_us(15); + } + wait_us(200); + + spi_read_adv(REG_SROM_ID); + + spi_write_adv(REG_Config2, 0x00); + + spi_stop(); + wait_ms(10); +} + +bool pmw_check_signature(void) { + uint8_t pid = spi_read_adv(REG_Product_ID); + uint8_t iv_pid = spi_read_adv(REG_Inverse_Product_ID); + uint8_t SROM_ver = spi_read_adv(REG_SROM_ID); + return (pid == 0x42 && iv_pid == 0xBD && SROM_ver == 0x04); // signature for SROM 0x04 +} + +report_pmw_t pmw_read_burst(void) { + if (!_inBurst) { + dprintf("burst on"); + spi_write_adv(REG_Motion_Burst, 0x00); + _inBurst = true; + } + + spi_start_adv(); + spi_write(REG_Motion_Burst); + wait_us(35); // waits for tSRAD + + report_pmw_t data; + data.motion = 0; + data.dx = 0; + data.mdx = 0; + data.dy = 0; + data.mdx = 0; + + data.motion = spi_read(); + spi_write(0x00); // skip Observation + data.dx = spi_read(); + data.mdx = spi_read(); + data.dy = spi_read(); + data.mdy = spi_read(); + + spi_stop(); + + print_byte(data.motion); + print_byte(data.dx); + print_byte(data.mdx); + print_byte(data.dy); + print_byte(data.mdy); + dprintf("\n"); + + data.isMotion = (data.motion & 0x80) != 0; + data.isOnSurface = (data.motion & 0x08) == 0; + data.dx |= (data.mdx << 8); + data.dx = data.dx * -1; + data.dy |= (data.mdy << 8); + data.dy = data.dy * -1; + + spi_stop(); + + if (data.motion & 0b111) { // panic recovery, sometimes burst mode works weird. + _inBurst = false; + } + + return data; +} |