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/* Copyright 2017 Jason Williams
* Copyright 2018 Jack Humbert
* Copyright 2019 Clueboard
* 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-simple.h"
#include <string.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
// 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][IS31FL3731_PWM_REGISTER_COUNT];
bool g_pwm_buffer_update_required[IS31FL3731_DRIVER_COUNT] = {false};
uint8_t g_led_control_registers[IS31FL3731_DRIVER_COUNT][IS31FL3731_LED_CONTROL_REGISTER_COUNT] = {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 < IS31FL3731_PWM_REGISTER_COUNT; 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_drivers(void) {
i2c_init();
is31fl3731_init(IS31FL3731_I2C_ADDRESS_1);
#if defined(IS31FL3731_I2C_ADDRESS_2)
is31fl3731_init(IS31FL3731_I2C_ADDRESS_2);
# if defined(IS31FL3731_I2C_ADDRESS_3)
is31fl3731_init(IS31FL3731_I2C_ADDRESS_3);
# if defined(IS31FL3731_I2C_ADDRESS_4)
is31fl3731_init(IS31FL3731_I2C_ADDRESS_4);
# endif
# endif
#endif
for (int i = 0; i < IS31FL3731_LED_COUNT; i++) {
is31fl3731_set_led_control_register(i, true);
}
is31fl3731_update_led_control_registers(IS31FL3731_I2C_ADDRESS_1, 0);
#if defined(IS31FL3731_I2C_ADDRESS_2)
is31fl3731_update_led_control_registers(IS31FL3731_I2C_ADDRESS_2, 1);
# if defined(IS31FL3731_I2C_ADDRESS_3)
is31fl3731_update_led_control_registers(IS31FL3731_I2C_ADDRESS_3, 2);
# if defined(IS31FL3731_I2C_ADDRESS_4)
is31fl3731_update_led_control_registers(IS31FL3731_I2C_ADDRESS_4, 3);
# endif
# endif
#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_REG_COMMAND, IS31FL3731_COMMAND_FUNCTION);
// enable software shutdown
is31fl3731_write_register(addr, IS31FL3731_FUNCTION_REG_SHUTDOWN, 0x00);
#ifdef IS31FL3731_DEGHOST // set to enable de-ghosting of the array
is31fl3731_write_register(addr, 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(addr, IS31FL3731_FUNCTION_REG_CONFIG, IS31FL3731_CONFIG_MODE_PICTURE);
// display frame 0
is31fl3731_write_register(addr, IS31FL3731_FUNCTION_REG_PICTURE_DISPLAY, 0x00);
// audio sync off
is31fl3731_write_register(addr, IS31FL3731_FUNCTION_REG_AUDIO_SYNC, 0x00);
// select bank 0
is31fl3731_write_register(addr, IS31FL3731_REG_COMMAND, IS31FL3731_COMMAND_FRAME_1);
// turn off all LEDs in the LED control register
for (int i = 0; i < IS31FL3731_LED_CONTROL_REGISTER_COUNT; 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_REG_COMMAND, IS31FL3731_COMMAND_FUNCTION);
// disable software shutdown
is31fl3731_write_register(addr, IS31FL3731_FUNCTION_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_REG_COMMAND, IS31FL3731_COMMAND_FRAME_1);
}
void is31fl3731_set_value(int index, uint8_t value) {
is31fl3731_led_t led;
if (index >= 0 && index < IS31FL3731_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.v - 0x24] == value) {
return;
}
g_pwm_buffer[led.driver][led.v - 0x24] = value;
g_pwm_buffer_update_required[led.driver] = true;
}
}
void is31fl3731_set_value_all(uint8_t value) {
for (int i = 0; i < IS31FL3731_LED_COUNT; i++) {
is31fl3731_set_value(i, value);
}
}
void is31fl3731_set_led_control_register(uint8_t index, bool value) {
is31fl3731_led_t led;
memcpy_P(&led, (&g_is31fl3731_leds[index]), sizeof(led));
uint8_t control_register = (led.v - 0x24) / 8;
uint8_t bit_value = (led.v - 0x24) % 8;
if (value) {
g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
} else {
g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
}
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 < IS31FL3731_LED_CONTROL_REGISTER_COUNT; i++) {
is31fl3731_write_register(addr, i, g_led_control_registers[index][i]);
}
g_led_control_registers_update_required[index] = false;
}
}
void is31fl3731_flush(void) {
is31fl3731_update_pwm_buffers(IS31FL3731_I2C_ADDRESS_1, 0);
#if defined(IS31FL3731_I2C_ADDRESS_2)
is31fl3731_update_pwm_buffers(IS31FL3731_I2C_ADDRESS_2, 1);
# if defined(IS31FL3731_I2C_ADDRESS_3)
is31fl3731_update_pwm_buffers(IS31FL3731_I2C_ADDRESS_3, 2);
# if defined(IS31FL3731_I2C_ADDRESS_4)
is31fl3731_update_pwm_buffers(IS31FL3731_I2C_ADDRESS_4, 3);
# endif
# endif
#endif
}
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