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/* Copyright 2017 Jason Williams
* Copyright 2018 Jack Humbert
* Copyright 2021 Doni Crosby
*
* 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 <string.h>
#include "i2c_master.h"
#include "wait.h"
#define IS31FL3731_REG_CONFIG 0x00
#define IS31FL3731_REG_CONFIG_PICTUREMODE 0x00
#define IS31FL3731_REG_CONFIG_AUTOPLAYMODE 0x08
#define IS31FL3731_REG_CONFIG_AUDIOPLAYMODE 0x18
#define IS31FL3731_CONF_PICTUREMODE 0x00
#define IS31FL3731_CONF_AUTOFRAMEMODE 0x04
#define IS31FL3731_CONF_AUDIOMODE 0x08
#define IS31FL3731_REG_PICTUREFRAME 0x01
// Not defined in the datasheet -- See AN for IC
#define IS31FL3731_REG_GHOST_IMAGE_PREVENTION 0xC2 // Set bit 4 to enable de-ghosting
#define IS31FL3731_REG_SHUTDOWN 0x0A
#define IS31FL3731_REG_AUDIOSYNC 0x06
#define IS31FL3731_COMMANDREGISTER 0xFD
#define IS31FL3731_BANK_FUNCTIONREG 0x0B // helpfully called 'page nine'
#ifndef IS31FL3731_I2C_TIMEOUT
# define IS31FL3731_I2C_TIMEOUT 100
#endif
#ifndef IS31FL3731_I2C_PERSISTENCE
# define IS31FL3731_I2C_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[IS31FL3731_DRIVER_COUNT][144];
bool g_pwm_buffer_update_required[IS31FL3731_DRIVER_COUNT] = {false};
uint8_t g_led_control_registers[IS31FL3731_DRIVER_COUNT][18] = {0};
bool g_led_control_registers_update_required[IS31FL3731_DRIVER_COUNT] = {false};
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 IS31FL3731_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3731_I2C_PERSISTENCE; i++) {
if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, IS31FL3731_I2C_TIMEOUT) == 0) break;
}
#else
i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, IS31FL3731_I2C_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
memcpy(g_twi_transfer_buffer + 1, pwm_buffer + i, 16);
#if IS31FL3731_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3731_I2C_PERSISTENCE; i++) {
if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, IS31FL3731_I2C_TIMEOUT) == 0) break;
}
#else
i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, IS31FL3731_I2C_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, IS31FL3731_COMMANDREGISTER, IS31FL3731_BANK_FUNCTIONREG);
// enable software shutdown
is31fl3731_write_register(addr, IS31FL3731_REG_SHUTDOWN, 0x00);
#ifdef IS31FL3731_DEGHOST // set to enable de-ghosting of the array
is31fl3731_write_register(addr, IS31FL3731_REG_GHOST_IMAGE_PREVENTION, 0x10);
#endif
// this delay was copied from other drivers, might not be needed
wait_ms(10);
// picture mode
is31fl3731_write_register(addr, IS31FL3731_REG_CONFIG, IS31FL3731_REG_CONFIG_PICTUREMODE);
// display frame 0
is31fl3731_write_register(addr, IS31FL3731_REG_PICTUREFRAME, 0x00);
// audio sync off
is31fl3731_write_register(addr, IS31FL3731_REG_AUDIOSYNC, 0x00);
// select bank 0
is31fl3731_write_register(addr, IS31FL3731_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, IS31FL3731_COMMANDREGISTER, IS31FL3731_BANK_FUNCTIONREG);
// disable software shutdown
is31fl3731_write_register(addr, IS31FL3731_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, IS31FL3731_COMMANDREGISTER, 0);
}
void is31fl3731_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
is31fl3731_led_t led;
if (index >= 0 && index < RGB_MATRIX_LED_COUNT) {
memcpy_P(&led, (&g_is31fl3731_leds[index]), sizeof(led));
// Subtract 0x24 to get the second index of g_pwm_buffer
if (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) {
return;
}
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 < RGB_MATRIX_LED_COUNT; i++) {
is31fl3731_set_color(i, red, green, blue);
}
}
void is31fl3731_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
is31fl3731_led_t led;
memcpy_P(&led, (&g_is31fl3731_leds[index]), sizeof(led));
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;
}
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