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/* Copyright 2021 @ Keychron (https://www.keychron.com)
*
* 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 "snled27351-mono.h"
#include "i2c_master.h"
#define SNLED27351_PWM_REGISTER_COUNT 192
#define SNLED27351_LED_CONTROL_REGISTER_COUNT 24
#ifndef SNLED27351_I2C_TIMEOUT
# define SNLED27351_I2C_TIMEOUT 100
#endif
#ifndef SNLED27351_I2C_PERSISTENCE
# define SNLED27351_I2C_PERSISTENCE 0
#endif
#ifndef SNLED27351_PHASE_CHANNEL
# define SNLED27351_PHASE_CHANNEL SNLED27351_SCAN_PHASE_12_CHANNEL
#endif
#ifndef SNLED27351_CURRENT_TUNE
# define SNLED27351_CURRENT_TUNE \
{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }
#endif
const uint8_t i2c_addresses[SNLED27351_DRIVER_COUNT] = {
SNLED27351_I2C_ADDRESS_1,
#ifdef SNLED27351_I2C_ADDRESS_2
SNLED27351_I2C_ADDRESS_2,
# ifdef SNLED27351_I2C_ADDRESS_3
SNLED27351_I2C_ADDRESS_3,
# ifdef SNLED27351_I2C_ADDRESS_4
SNLED27351_I2C_ADDRESS_4,
# endif
# endif
#endif
};
// These buffers match the SNLED27351 PWM registers.
// The control buffers match the PG0 LED On/Off registers.
// 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 snled27351_write_pwm_buffer() but it's
// probably not worth the extra complexity.
typedef struct snled27351_driver_t {
uint8_t pwm_buffer[SNLED27351_PWM_REGISTER_COUNT];
bool pwm_buffer_dirty;
uint8_t led_control_buffer[SNLED27351_LED_CONTROL_REGISTER_COUNT];
bool led_control_buffer_dirty;
} PACKED snled27351_driver_t;
snled27351_driver_t driver_buffers[SNLED27351_DRIVER_COUNT] = {{
.pwm_buffer = {0},
.pwm_buffer_dirty = false,
.led_control_buffer = {0},
.led_control_buffer_dirty = false,
}};
void snled27351_write_register(uint8_t index, uint8_t reg, uint8_t data) {
#if SNLED27351_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) {
if (i2c_write_register(i2c_addresses[index] << 1, reg, &data, 1, SNLED27351_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
}
#else
i2c_write_register(i2c_addresses[index] << 1, reg, &data, 1, SNLED27351_I2C_TIMEOUT);
#endif
}
void snled27351_select_page(uint8_t index, uint8_t page) {
snled27351_write_register(index, SNLED27351_REG_COMMAND, page);
}
void snled27351_write_pwm_buffer(uint8_t index) {
// Assumes PG1 is already selected.
// Transmit PWM registers in 12 transfers of 16 bytes.
// Iterate over the pwm_buffer contents at 16 byte intervals.
for (uint8_t i = 0; i < SNLED27351_PWM_REGISTER_COUNT; i += 16) {
#if SNLED27351_I2C_PERSISTENCE > 0
for (uint8_t j = 0; j < SNLED27351_I2C_PERSISTENCE; j++) {
if (i2c_write_register(i2c_addresses[index] << 1, i, driver_buffers[index].pwm_buffer + i, 16, SNLED27351_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
}
#else
i2c_write_register(i2c_addresses[index] << 1, i, driver_buffers[index].pwm_buffer + i, 16, SNLED27351_I2C_TIMEOUT);
#endif
}
}
void snled27351_init_drivers(void) {
i2c_init();
for (uint8_t i = 0; i < SNLED27351_DRIVER_COUNT; i++) {
snled27351_init(i);
}
for (int i = 0; i < SNLED27351_LED_COUNT; i++) {
snled27351_set_led_control_register(i, true);
}
for (uint8_t i = 0; i < SNLED27351_DRIVER_COUNT; i++) {
snled27351_update_led_control_registers(i);
}
}
void snled27351_init(uint8_t index) {
snled27351_select_page(index, SNLED27351_COMMAND_FUNCTION);
// Setting LED driver to shutdown mode
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_SHUTDOWN);
// Setting internal channel pulldown/pullup
snled27351_write_register(index, SNLED27351_FUNCTION_REG_PULLDOWNUP, SNLED27351_PULLDOWNUP_ALL_ENABLED);
// Select number of scan phase
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SCAN_PHASE, SNLED27351_PHASE_CHANNEL);
// Setting PWM Delay Phase
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SLEW_RATE_CONTROL_MODE_1, SNLED27351_SLEW_RATE_CONTROL_MODE_1_PDP_ENABLE);
// Setting Driving/Sinking Channel Slew Rate
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SLEW_RATE_CONTROL_MODE_2, SNLED27351_SLEW_RATE_CONTROL_MODE_2_DSL_ENABLE | SNLED27351_SLEW_RATE_CONTROL_MODE_2_SSL_ENABLE);
// Setting Iref
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SOFTWARE_SLEEP, 0);
snled27351_select_page(index, SNLED27351_COMMAND_LED_CONTROL);
for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) {
snled27351_write_register(index, i, 0x00);
}
snled27351_select_page(index, SNLED27351_COMMAND_PWM);
for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) {
snled27351_write_register(index, i, 0x00);
}
snled27351_select_page(index, SNLED27351_COMMAND_CURRENT_TUNE);
uint8_t current_tune_reg_list[SNLED27351_LED_CURRENT_TUNE_LENGTH] = SNLED27351_CURRENT_TUNE;
for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) {
snled27351_write_register(index, i, current_tune_reg_list[i]);
}
snled27351_select_page(index, SNLED27351_COMMAND_LED_CONTROL);
for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) {
snled27351_write_register(index, i, 0xFF);
}
snled27351_select_page(index, SNLED27351_COMMAND_FUNCTION);
// Setting LED driver to normal mode
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_NORMAL);
}
void snled27351_set_value(int index, uint8_t value) {
snled27351_led_t led;
if (index >= 0 && index < SNLED27351_LED_COUNT) {
memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led));
if (driver_buffers[led.driver].pwm_buffer[led.v] == value) {
return;
}
driver_buffers[led.driver].pwm_buffer[led.v] = value;
driver_buffers[led.driver].pwm_buffer_dirty = true;
}
}
void snled27351_set_value_all(uint8_t value) {
for (int i = 0; i < SNLED27351_LED_COUNT; i++) {
snled27351_set_value(i, value);
}
}
void snled27351_set_led_control_register(uint8_t index, bool value) {
snled27351_led_t led;
memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led));
uint8_t control_register = led.v / 8;
uint8_t bit_value = led.v % 8;
if (value) {
driver_buffers[led.driver].led_control_buffer[control_register] |= (1 << bit_value);
} else {
driver_buffers[led.driver].led_control_buffer[control_register] &= ~(1 << bit_value);
}
driver_buffers[led.driver].led_control_buffer_dirty = true;
}
void snled27351_update_pwm_buffers(uint8_t index) {
if (driver_buffers[index].pwm_buffer_dirty) {
snled27351_select_page(index, SNLED27351_COMMAND_PWM);
snled27351_write_pwm_buffer(index);
driver_buffers[index].pwm_buffer_dirty = false;
}
}
void snled27351_update_led_control_registers(uint8_t index) {
if (driver_buffers[index].led_control_buffer_dirty) {
snled27351_select_page(index, SNLED27351_COMMAND_LED_CONTROL);
for (uint8_t i = 0; i < SNLED27351_LED_CONTROL_REGISTER_COUNT; i++) {
snled27351_write_register(index, i, driver_buffers[index].led_control_buffer[i]);
}
driver_buffers[index].led_control_buffer_dirty = false;
}
}
void snled27351_flush(void) {
for (uint8_t i = 0; i < SNLED27351_DRIVER_COUNT; i++) {
snled27351_update_pwm_buffers(i);
}
}
void snled27351_sw_return_normal(uint8_t index) {
snled27351_select_page(index, SNLED27351_COMMAND_FUNCTION);
// Setting LED driver to normal mode
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_NORMAL);
}
void snled27351_sw_shutdown(uint8_t index) {
snled27351_select_page(index, SNLED27351_COMMAND_FUNCTION);
// Setting LED driver to shutdown mode
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_SHUTDOWN);
// Write SW Sleep Register
snled27351_write_register(index, SNLED27351_FUNCTION_REG_SOFTWARE_SLEEP, SNLED27351_SOFTWARE_SLEEP_ENABLE);
}
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