keychron_qmk_firmware/drivers/is31fl3731.c

/* 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/>.
 */

#ifdef __AVR__
#include <avr/interrupt.h>
#include <avr/io.h>
#include <util/delay.h>
#else
#include "wait.h"
#endif

#include "is31fl3731.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:
// 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 = false;

uint8_t g_led_control_registers[DRIVER_COUNT][18] = { { 0 }, { 0 } };
bool g_led_control_registers_update_required = 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 IS31_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 IS31_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 IS31_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
    IS31_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );

    // enable software shutdown
    IS31_write_register( addr, ISSI_REG_SHUTDOWN, 0x00 );
    // this delay was copied from other drivers, might not be needed
    #ifdef __AVR__
    _delay_ms( 10 );
    #else
    wait_ms(10);
    #endif

    // picture mode
    IS31_write_register( addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE );
    // display frame 0
    IS31_write_register( addr, ISSI_REG_PICTUREFRAME, 0x00 );
    // audio sync off
    IS31_write_register( addr, ISSI_REG_AUDIOSYNC, 0x00 );

    // select bank 0
    IS31_write_register( addr, ISSI_COMMANDREGISTER, 0 );

    // turn off all LEDs in the LED control register
    for ( int i = 0x00; i <= 0x11; i++ )
    {
        IS31_write_register( addr, i, 0x00 );
    }

    // turn off all LEDs in the blink control register (not really needed)
    for ( int i = 0x12; i <= 0x23; i++ )
    {
        IS31_write_register( addr, i, 0x00 );
    }

    // set PWM on all LEDs to 0
    for ( int i = 0x24; i <= 0xB3; i++ )
    {
        IS31_write_register( addr, i, 0x00 );
    }

    // select "function register" bank
    IS31_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );

    // disable software shutdown
    IS31_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
    IS31_write_register( addr, ISSI_COMMANDREGISTER, 0 );

}

void IS31_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 = true;
    }
}

void IS31_set_color_all( uint8_t red, uint8_t green, uint8_t blue )
{
    for ( int i = 0; i < DRIVER_LED_TOTAL; i++ )
    {
        IS31_set_color( i, red, green, blue );
    }
}

void IS31_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 = true;

}

void IS31_update_pwm_buffers( uint8_t addr1, uint8_t addr2 )
{
    if ( g_pwm_buffer_update_required )
    {
        IS31_write_pwm_buffer( addr1, g_pwm_buffer[0] );
        IS31_write_pwm_buffer( addr2, g_pwm_buffer[1] );
    }
    g_pwm_buffer_update_required = false;
}

void IS31_update_led_control_registers( uint8_t addr1, uint8_t addr2 )
{
    if ( g_led_control_registers_update_required )
    {
        for ( int i=0; i<18; i++ )
        {
            IS31_write_register(addr1, i, g_led_control_registers[0][i] );
            IS31_write_register(addr2, i, g_led_control_registers[1][i] );
        }
    }
}