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#include "is31fl3742a.h"
#include <string.h>
#include "i2c_master.h"
#include "wait.h"
#define IS31FL3742A_PWM_REGISTER_COUNT 180
#define IS31FL3742A_SCALING_REGISTER_COUNT 180
#ifndef IS31FL3742A_I2C_TIMEOUT
# define IS31FL3742A_I2C_TIMEOUT 100
#endif
#ifndef IS31FL3742A_I2C_PERSISTENCE
# define IS31FL3742A_I2C_PERSISTENCE 0
#endif
#ifndef IS31FL3742A_CONFIGURATION
# define IS31FL3742A_CONFIGURATION 0x31
#endif
#ifndef IS31FL3742A_PWM_FREQUENCY
# define IS31FL3742A_PWM_FREQUENCY IS31FL3742A_PWM_FREQUENCY_29K_HZ
#endif
#ifndef IS31FL3742A_SW_PULLDOWN
# define IS31FL3742A_SW_PULLDOWN IS31FL3742A_PDR_8K_OHM
#endif
#ifndef IS31FL3742A_CS_PULLUP
# define IS31FL3742A_CS_PULLUP IS31FL3742A_PUR_8K_OHM
#endif
#ifndef IS31FL3742A_GLOBAL_CURRENT
# define IS31FL3742A_GLOBAL_CURRENT 0xFF
#endif
uint8_t i2c_transfer_buffer[20] = {0xFF};
uint8_t g_pwm_buffer[IS31FL3742A_DRIVER_COUNT][IS31FL3742A_PWM_REGISTER_COUNT];
bool g_pwm_buffer_update_required[IS31FL3742A_DRIVER_COUNT] = {false};
bool g_scaling_registers_update_required[IS31FL3742A_DRIVER_COUNT] = {false};
uint8_t g_scaling_registers[IS31FL3742A_DRIVER_COUNT][IS31FL3742A_SCALING_REGISTER_COUNT];
void is31fl3742a_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
i2c_transfer_buffer[0] = reg;
i2c_transfer_buffer[1] = data;
#if IS31FL3742A_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3742A_I2C_PERSISTENCE; i++) {
if (i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3742A_I2C_TIMEOUT) == 0) break;
}
#else
i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3742A_I2C_TIMEOUT);
#endif
}
void is31fl3742a_select_page(uint8_t addr, uint8_t page) {
is31fl3742a_write_register(addr, IS31FL3742A_REG_COMMAND_WRITE_LOCK, IS31FL3742A_COMMAND_WRITE_LOCK_MAGIC);
is31fl3742a_write_register(addr, IS31FL3742A_REG_COMMAND, page);
}
void is31fl3742a_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
// Assumes page 0 is already selected.
// If any of the transactions fails function returns false.
// Transmit PWM registers in 12 transfers of 16 bytes.
// i2c_transfer_buffer[] is 20 bytes
// Iterate over the pwm_buffer contents at 16 byte intervals.
for (int i = 0; i < IS31FL3742A_PWM_REGISTER_COUNT; i += 16) {
i2c_transfer_buffer[0] = i;
// Copy the data from i to i+15.
// Device will auto-increment register for data after the first byte
// Thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer.
memcpy(i2c_transfer_buffer + 1, pwm_buffer + i, 16);
#if IS31FL3742A_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3742A_I2C_PERSISTENCE; i++) {
if (i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3742A_I2C_TIMEOUT) != 0) break;
}
#else
i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3742A_I2C_TIMEOUT);
#endif
}
}
void is31fl3742a_init_drivers(void) {
i2c_init();
is31fl3742a_init(IS31FL3742A_I2C_ADDRESS_1);
#if defined(IS31FL3742A_I2C_ADDRESS_2)
is31fl3742a_init(IS31FL3742A_I2C_ADDRESS_2);
# if defined(IS31FL3742A_I2C_ADDRESS_3)
is31fl3742a_init(IS31FL3742A_I2C_ADDRESS_3);
# if defined(IS31FL3742A_I2C_ADDRESS_4)
is31fl3742a_init(IS31FL3742A_I2C_ADDRESS_4);
# endif
# endif
#endif
for (int i = 0; i < IS31FL3742A_LED_COUNT; i++) {
is31fl3742a_set_scaling_register(i, 0xFF, 0xFF, 0xFF);
}
is31fl3742a_update_scaling_registers(IS31FL3742A_I2C_ADDRESS_1, 0);
#if defined(IS31FL3742A_I2C_ADDRESS_2)
is31fl3742a_update_scaling_registers(IS31FL3742A_I2C_ADDRESS_2, 1);
# if defined(IS31FL3742A_I2C_ADDRESS_3)
is31fl3742a_update_scaling_registers(IS31FL3742A_I2C_ADDRESS_3, 2);
# if defined(IS31FL3742A_I2C_ADDRESS_4)
is31fl3742a_update_scaling_registers(IS31FL3742A_I2C_ADDRESS_4, 3);
# endif
# endif
#endif
}
void is31fl3742a_init(uint8_t addr) {
// In order to avoid the LEDs being driven with garbage data
// in the LED driver's PWM registers, shutdown is enabled last.
// Set up the mode and other settings, clear the PWM registers,
// then disable software shutdown.
is31fl3742a_select_page(addr, IS31FL3742A_COMMAND_SCALING);
// Turn off all LEDs.
for (int i = 0; i < IS31FL3742A_SCALING_REGISTER_COUNT; i++) {
is31fl3742a_write_register(addr, i, 0x00);
}
is31fl3742a_select_page(addr, IS31FL3742A_COMMAND_PWM);
for (int i = 0; i < IS31FL3742A_PWM_REGISTER_COUNT; i++) {
is31fl3742a_write_register(addr, i, 0x00);
}
is31fl3742a_select_page(addr, IS31FL3742A_COMMAND_FUNCTION);
is31fl3742a_write_register(addr, IS31FL3742A_FUNCTION_REG_PULLDOWNUP, (IS31FL3742A_SW_PULLDOWN << 4) | IS31FL3742A_CS_PULLUP);
is31fl3742a_write_register(addr, IS31FL3742A_FUNCTION_REG_GLOBAL_CURRENT, IS31FL3742A_GLOBAL_CURRENT);
is31fl3742a_write_register(addr, IS31FL3742A_FUNCTION_REG_PWM_FREQUENCY, (IS31FL3742A_PWM_FREQUENCY & 0b0111));
is31fl3742a_write_register(addr, IS31FL3742A_FUNCTION_REG_CONFIGURATION, IS31FL3742A_CONFIGURATION);
// Wait 10ms to ensure the device has woken up.
wait_ms(10);
}
void is31fl3742a_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
is31fl3742a_led_t led;
if (index >= 0 && index < IS31FL3742A_LED_COUNT) {
memcpy_P(&led, (&g_is31fl3742a_leds[index]), sizeof(led));
if (g_pwm_buffer[led.driver][led.r] == red && g_pwm_buffer[led.driver][led.g] == green && g_pwm_buffer[led.driver][led.b] == blue) {
return;
}
g_pwm_buffer[led.driver][led.r] = red;
g_pwm_buffer[led.driver][led.g] = green;
g_pwm_buffer[led.driver][led.b] = blue;
g_pwm_buffer_update_required[led.driver] = true;
}
}
void is31fl3742a_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
for (int i = 0; i < IS31FL3742A_LED_COUNT; i++) {
is31fl3742a_set_color(i, red, green, blue);
}
}
void is31fl3742a_set_scaling_register(uint8_t index, uint8_t red, uint8_t green, uint8_t blue) {
is31fl3742a_led_t led;
memcpy_P(&led, (&g_is31fl3742a_leds[index]), sizeof(led));
g_scaling_registers[led.driver][led.r] = red;
g_scaling_registers[led.driver][led.g] = green;
g_scaling_registers[led.driver][led.b] = blue;
g_scaling_registers_update_required[led.driver] = true;
}
void is31fl3742a_update_pwm_buffers(uint8_t addr, uint8_t index) {
if (g_pwm_buffer_update_required[index]) {
is31fl3742a_select_page(addr, IS31FL3742A_COMMAND_PWM);
is31fl3742a_write_pwm_buffer(addr, g_pwm_buffer[index]);
g_pwm_buffer_update_required[index] = false;
}
}
void is31fl3742a_update_scaling_registers(uint8_t addr, uint8_t index) {
if (g_scaling_registers_update_required[index]) {
is31fl3742a_select_page(addr, IS31FL3742A_COMMAND_SCALING);
for (int i = 0; i < IS31FL3742A_SCALING_REGISTER_COUNT; i++) {
is31fl3742a_write_register(addr, i, g_scaling_registers[index][i]);
}
g_scaling_registers_update_required[index] = false;
}
}
void is31fl3742a_flush(void) {
is31fl3742a_update_pwm_buffers(IS31FL3742A_I2C_ADDRESS_1, 0);
#if defined(IS31FL3742A_I2C_ADDRESS_2)
is31fl3742a_update_pwm_buffers(IS31FL3742A_I2C_ADDRESS_2, 1);
# if defined(IS31FL3742A_I2C_ADDRESS_3)
is31fl3742a_update_pwm_buffers(IS31FL3742A_I2C_ADDRESS_3, 2);
# if defined(IS31FL3742A_I2C_ADDRESS_4)
is31fl3742a_update_pwm_buffers(IS31FL3742A_I2C_ADDRESS_4, 3);
# endif
# endif
#endif
}
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