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/* Copyright 2018 Jason Williams (Wilba)
*
* 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 "is31fl3218.h"
#include <string.h>
#include "i2c_master.h"
#define IS31FL3218_PWM_REGISTER_COUNT 18
#define IS31FL3218_LED_CONTROL_REGISTER_COUNT 3
#ifndef IS31FL3218_I2C_TIMEOUT
# define IS31FL3218_I2C_TIMEOUT 100
#endif
#ifndef IS31FL3218_I2C_PERSISTENCE
# define IS31FL3218_I2C_PERSISTENCE 0
#endif
// Reusable buffer for transfers
uint8_t g_twi_transfer_buffer[20];
// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
uint8_t g_pwm_buffer[IS31FL3218_PWM_REGISTER_COUNT];
bool g_pwm_buffer_update_required = false;
uint8_t g_led_control_registers[IS31FL3218_LED_CONTROL_REGISTER_COUNT] = {0};
bool g_led_control_registers_update_required = false;
void is31fl3218_write_register(uint8_t reg, uint8_t data) {
g_twi_transfer_buffer[0] = reg;
g_twi_transfer_buffer[1] = data;
#if IS31FL3218_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
if (i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT) == 0) break;
}
#else
i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT);
#endif
}
void is31fl3218_write_pwm_buffer(uint8_t *pwm_buffer) {
g_twi_transfer_buffer[0] = IS31FL3218_REG_PWM;
memcpy(g_twi_transfer_buffer + 1, pwm_buffer, 18);
#if IS31FL3218_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
}
#else
i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
#endif
}
void is31fl3218_init(void) {
i2c_init();
// In case we ever want to reinitialize (?)
is31fl3218_write_register(IS31FL3218_REG_RESET, 0x00);
// Turn off software shutdown
is31fl3218_write_register(IS31FL3218_REG_SHUTDOWN, 0x01);
// Set all PWM values to zero
for (uint8_t i = 0; i < IS31FL3218_PWM_REGISTER_COUNT; i++) {
is31fl3218_write_register(IS31FL3218_REG_PWM + i, 0x00);
}
// turn off all LEDs in the LED control register
for (uint8_t i = 0; i < IS31FL3218_LED_CONTROL_REGISTER_COUNT; i++) {
is31fl3218_write_register(IS31FL3218_REG_LED_CONTROL_1 + i, 0x00);
}
// Load PWM registers and LED Control register data
is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
for (int i = 0; i < IS31FL3218_LED_COUNT; i++) {
is31fl3218_set_led_control_register(i, true);
}
is31fl3218_update_led_control_registers();
}
void is31fl3218_set_value(int index, uint8_t value) {
is31fl3218_led_t led;
if (index >= 0 && index < IS31FL3218_LED_COUNT) {
memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
}
if (g_pwm_buffer[led.v - IS31FL3218_REG_PWM] == value) {
return;
}
g_pwm_buffer[led.v - IS31FL3218_REG_PWM] = value;
g_pwm_buffer_update_required = true;
}
void is31fl3218_set_value_all(uint8_t value) {
for (int i = 0; i < IS31FL3218_LED_COUNT; i++) {
is31fl3218_set_value(i, value);
}
}
void is31fl3218_set_led_control_register(uint8_t index, bool value) {
is31fl3218_led_t led;
memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
uint8_t control_register = (led.v - IS31FL3218_REG_PWM) / 6;
uint8_t bit_value = (led.v - IS31FL3218_REG_PWM) % 6;
if (value) {
g_led_control_registers[control_register] |= (1 << bit_value);
} else {
g_led_control_registers[control_register] &= ~(1 << bit_value);
}
g_led_control_registers_update_required = true;
}
void is31fl3218_update_pwm_buffers(void) {
if (g_pwm_buffer_update_required) {
is31fl3218_write_pwm_buffer(g_pwm_buffer);
// Load PWM registers and LED Control register data
is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
g_pwm_buffer_update_required = false;
}
}
void is31fl3218_update_led_control_registers(void) {
if (g_led_control_registers_update_required) {
for (int i = 0; i < IS31FL3218_LED_CONTROL_REGISTER_COUNT; i++) {
is31fl3218_write_register(IS31FL3218_REG_LED_CONTROL_1 + i, g_led_control_registers[i]);
}
g_led_control_registers_update_required = false;
}
}
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