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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 "i2c_master.h"
#include "wait.h"
#define IS31FL3731_PWM_REGISTER_COUNT 144
#define IS31FL3731_LED_CONTROL_REGISTER_COUNT 18
#ifndef IS31FL3731_I2C_TIMEOUT
# define IS31FL3731_I2C_TIMEOUT 100
#endif
#ifndef IS31FL3731_I2C_PERSISTENCE
# define IS31FL3731_I2C_PERSISTENCE 0
#endif
const uint8_t i2c_addresses[IS31FL3731_DRIVER_COUNT] = {
IS31FL3731_I2C_ADDRESS_1,
#ifdef IS31FL3731_I2C_ADDRESS_2
IS31FL3731_I2C_ADDRESS_2,
# ifdef IS31FL3731_I2C_ADDRESS_3
IS31FL3731_I2C_ADDRESS_3,
# ifdef IS31FL3731_I2C_ADDRESS_4
IS31FL3731_I2C_ADDRESS_4,
# endif
# endif
#endif
};
// 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.
typedef struct is31fl3731_driver_t {
uint8_t pwm_buffer[IS31FL3731_PWM_REGISTER_COUNT];
bool pwm_buffer_dirty;
uint8_t led_control_buffer[IS31FL3731_LED_CONTROL_REGISTER_COUNT];
bool led_control_buffer_dirty;
} PACKED is31fl3731_driver_t;
is31fl3731_driver_t driver_buffers[IS31FL3731_DRIVER_COUNT] = {{
.pwm_buffer = {0},
.pwm_buffer_dirty = false,
.led_control_buffer = {0},
.led_control_buffer_dirty = false,
}};
void is31fl3731_write_register(uint8_t index, uint8_t reg, uint8_t data) {
#if IS31FL3731_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3731_I2C_PERSISTENCE; i++) {
if (i2c_write_register(i2c_addresses[index] << 1, reg, &data, 1, IS31FL3731_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
}
#else
i2c_write_register(i2c_addresses[index] << 1, reg, &data, 1, IS31FL3731_I2C_TIMEOUT);
#endif
}
void is31fl3731_select_page(uint8_t index, uint8_t page) {
is31fl3731_write_register(index, IS31FL3731_REG_COMMAND, page);
}
void is31fl3731_write_pwm_buffer(uint8_t index) {
// Assumes page 0 is already selected.
// Transmit PWM registers in 9 transfers of 16 bytes.
// Iterate over the pwm_buffer contents at 16 byte intervals.
for (uint8_t i = 0; i < IS31FL3731_PWM_REGISTER_COUNT; i += 16) {
#if IS31FL3731_I2C_PERSISTENCE > 0
for (uint8_t j = 0; j < IS31FL3731_I2C_PERSISTENCE; j++) {
if (i2c_write_register(i2c_addresses[index] << 1, IS31FL3731_FRAME_REG_PWM + i, driver_buffers[index].pwm_buffer + i, 16, IS31FL3731_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
}
#else
i2c_write_register(i2c_addresses[index] << 1, IS31FL3731_FRAME_REG_PWM + i, driver_buffers[index].pwm_buffer + i, 16, IS31FL3731_I2C_TIMEOUT);
#endif
}
}
void is31fl3731_init_drivers(void) {
i2c_init();
for (uint8_t i = 0; i < IS31FL3731_DRIVER_COUNT; i++) {
is31fl3731_init(i);
}
for (int i = 0; i < IS31FL3731_LED_COUNT; i++) {
is31fl3731_set_led_control_register(i, true, true, true);
}
for (uint8_t i = 0; i < IS31FL3731_DRIVER_COUNT; i++) {
is31fl3731_update_led_control_registers(i);
}
}
void is31fl3731_init(uint8_t index) {
// 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.
is31fl3731_select_page(index, IS31FL3731_COMMAND_FUNCTION);
// enable software shutdown
is31fl3731_write_register(index, IS31FL3731_FUNCTION_REG_SHUTDOWN, 0x00);
#ifdef IS31FL3731_DEGHOST // set to enable de-ghosting of the array
is31fl3731_write_register(index, IS31FL3731_FUNCTION_REG_GHOST_IMAGE_PREVENTION, IS31FL3731_GHOST_IMAGE_PREVENTION_GEN);
#endif
// this delay was copied from other drivers, might not be needed
wait_ms(10);
// picture mode
is31fl3731_write_register(index, IS31FL3731_FUNCTION_REG_CONFIG, IS31FL3731_CONFIG_MODE_PICTURE);
// display frame 0
is31fl3731_write_register(index, IS31FL3731_FUNCTION_REG_PICTURE_DISPLAY, 0x00);
// audio sync off
is31fl3731_write_register(index, IS31FL3731_FUNCTION_REG_AUDIO_SYNC, 0x00);
is31fl3731_select_page(index, IS31FL3731_COMMAND_FRAME_1);
// turn off all LEDs in the LED control register
for (uint8_t i = 0; i < IS31FL3731_LED_CONTROL_REGISTER_COUNT; i++) {
is31fl3731_write_register(index, IS31FL3731_FRAME_REG_LED_CONTROL + i, 0x00);
}
// turn off all LEDs in the blink control register (not really needed)
for (uint8_t i = 0; i < IS31FL3731_LED_CONTROL_REGISTER_COUNT; i++) {
is31fl3731_write_register(index, IS31FL3731_FRAME_REG_BLINK_CONTROL + i, 0x00);
}
// set PWM on all LEDs to 0
for (uint8_t i = 0; i < IS31FL3731_PWM_REGISTER_COUNT; i++) {
is31fl3731_write_register(index, IS31FL3731_FRAME_REG_PWM + i, 0x00);
}
is31fl3731_select_page(index, IS31FL3731_COMMAND_FUNCTION);
// disable software shutdown
is31fl3731_write_register(index, IS31FL3731_FUNCTION_REG_SHUTDOWN, 0x01);
// select page 0 and leave it selected.
// most usage after initialization is just writing PWM buffers in page 0
// as there's not much point in double-buffering
is31fl3731_select_page(index, IS31FL3731_COMMAND_FRAME_1);
}
void is31fl3731_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
is31fl3731_led_t led;
if (index >= 0 && index < IS31FL3731_LED_COUNT) {
memcpy_P(&led, (&g_is31fl3731_leds[index]), sizeof(led));
if (driver_buffers[led.driver].pwm_buffer[led.r] == red && driver_buffers[led.driver].pwm_buffer[led.g] == green && driver_buffers[led.driver].pwm_buffer[led.b] == blue) {
return;
}
driver_buffers[led.driver].pwm_buffer[led.r] = red;
driver_buffers[led.driver].pwm_buffer[led.g] = green;
driver_buffers[led.driver].pwm_buffer[led.b] = blue;
driver_buffers[led.driver].pwm_buffer_dirty = true;
}
}
void is31fl3731_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
for (int i = 0; i < IS31FL3731_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 / 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) {
driver_buffers[led.driver].led_control_buffer[control_register_r] |= (1 << bit_r);
} else {
driver_buffers[led.driver].led_control_buffer[control_register_r] &= ~(1 << bit_r);
}
if (green) {
driver_buffers[led.driver].led_control_buffer[control_register_g] |= (1 << bit_g);
} else {
driver_buffers[led.driver].led_control_buffer[control_register_g] &= ~(1 << bit_g);
}
if (blue) {
driver_buffers[led.driver].led_control_buffer[control_register_b] |= (1 << bit_b);
} else {
driver_buffers[led.driver].led_control_buffer[control_register_b] &= ~(1 << bit_b);
}
driver_buffers[led.driver].led_control_buffer_dirty = true;
}
void is31fl3731_update_pwm_buffers(uint8_t index) {
if (driver_buffers[index].pwm_buffer_dirty) {
is31fl3731_write_pwm_buffer(index);
driver_buffers[index].pwm_buffer_dirty = false;
}
}
void is31fl3731_update_led_control_registers(uint8_t index) {
if (driver_buffers[index].led_control_buffer_dirty) {
for (uint8_t i = 0; i < IS31FL3731_LED_CONTROL_REGISTER_COUNT; i++) {
is31fl3731_write_register(index, i, driver_buffers[index].led_control_buffer[i]);
}
driver_buffers[index].led_control_buffer_dirty = false;
}
}
void is31fl3731_flush(void) {
for (uint8_t i = 0; i < IS31FL3731_DRIVER_COUNT; i++) {
is31fl3731_update_pwm_buffers(i);
}
}
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