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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-simple.h"
#include "i2c_master.h"
#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_MSKPHASE_12CHANNEL
#endif
#ifndef SNLED27351_CURRENT_TUNE
# define SNLED27351_CURRENT_TUNE \
{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }
#endif
// Transfer buffer for TWITransmitData()
uint8_t g_twi_transfer_buffer[20];
// 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.
uint8_t g_pwm_buffer[SNLED27351_DRIVER_COUNT][192];
bool g_pwm_buffer_update_required[SNLED27351_DRIVER_COUNT] = {false};
uint8_t g_led_control_registers[SNLED27351_DRIVER_COUNT][24] = {0};
bool g_led_control_registers_update_required[SNLED27351_DRIVER_COUNT] = {false};
bool snled27351_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
// If the transaction fails function returns false.
g_twi_transfer_buffer[0] = reg;
g_twi_transfer_buffer[1] = data;
#if SNLED27351_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) {
if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, SNLED27351_I2C_TIMEOUT) != 0) {
return false;
}
}
#else
if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, SNLED27351_I2C_TIMEOUT) != 0) {
return false;
}
#endif
return true;
}
bool snled27351_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
// Assumes PG1 is already selected.
// If any of the transactions fails function returns false.
// Transmit PWM registers in 12 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 < 192; i += 16) {
g_twi_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.
for (int j = 0; j < 16; j++) {
g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
}
#if SNLED27351_I2C_PERSISTENCE > 0
for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) {
if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, SNLED27351_I2C_TIMEOUT) != 0) {
return false;
}
}
#else
if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, SNLED27351_I2C_TIMEOUT) != 0) {
return false;
}
#endif
}
return true;
}
void snled27351_init(uint8_t addr) {
// Select to function page
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE);
// Setting LED driver to shutdown mode
snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_SHUT_DOWN_MODE);
// Setting internal channel pulldown/pullup
snled27351_write_register(addr, SNLED27351_REG_PDU, SNLED27351_MSKSET_CA_CB_CHANNEL);
// Select number of scan phase
snled27351_write_register(addr, SNLED27351_REG_SCAN_PHASE, SNLED27351_PHASE_CHANNEL);
// Setting PWM Delay Phase
snled27351_write_register(addr, SNLED27351_REG_SLEW_RATE_CONTROL_MODE1, SNLED27351_MSKPWM_DELAY_PHASE_ENABLE);
// Setting Driving/Sinking Channel Slew Rate
snled27351_write_register(addr, SNLED27351_REG_SLEW_RATE_CONTROL_MODE2, SNLED27351_MSKDRIVING_SINKING_CHANNEL_SLEWRATE_ENABLE);
// Setting Iref
snled27351_write_register(addr, SNLED27351_REG_SOFTWARE_SLEEP, SNLED27351_MSKSLEEP_DISABLE);
// Set LED CONTROL PAGE (Page 0)
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_CONTROL_PAGE);
for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) {
snled27351_write_register(addr, i, 0x00);
}
// Set PWM PAGE (Page 1)
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_PWM_PAGE);
for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) {
snled27351_write_register(addr, i, 0x00);
}
// Set CURRENT PAGE (Page 4)
uint8_t current_tune_reg_list[SNLED27351_LED_CURRENT_TUNE_LENGTH] = SNLED27351_CURRENT_TUNE;
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_CURRENT_TUNE_PAGE);
for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) {
snled27351_write_register(addr, i, current_tune_reg_list[i]);
}
// Enable LEDs ON/OFF
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_CONTROL_PAGE);
for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) {
snled27351_write_register(addr, i, 0xFF);
}
// Select to function page
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE);
// Setting LED driver to normal mode
snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_NORMAL_MODE);
}
void snled27351_set_value(int index, uint8_t value) {
snled27351_led_t led;
if (index >= 0 && index < LED_MATRIX_LED_COUNT) {
memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led));
if (g_pwm_buffer[led.driver][led.v] == value) {
return;
}
g_pwm_buffer[led.driver][led.v] = value;
g_pwm_buffer_update_required[led.driver] = true;
}
}
void snled27351_set_value_all(uint8_t value) {
for (int i = 0; i < LED_MATRIX_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) {
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 snled27351_update_pwm_buffers(uint8_t addr, uint8_t index) {
if (g_pwm_buffer_update_required[index]) {
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_PWM_PAGE);
// If any of the transactions fail we risk writing dirty PG0,
// refresh page 0 just in case.
if (!snled27351_write_pwm_buffer(addr, g_pwm_buffer[index])) {
g_led_control_registers_update_required[index] = true;
}
}
g_pwm_buffer_update_required[index] = false;
}
void snled27351_update_led_control_registers(uint8_t addr, uint8_t index) {
if (g_led_control_registers_update_required[index]) {
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_LED_CONTROL_PAGE);
for (int i = 0; i < 24; i++) {
snled27351_write_register(addr, i, g_led_control_registers[index][i]);
}
}
g_led_control_registers_update_required[index] = false;
}
void snled27351_flush(void) {
snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_1, 0);
#if defined(SNLED27351_I2C_ADDRESS_2)
snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_2, 1);
# if defined(SNLED27351_I2C_ADDRESS_3)
snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_3, 2);
# if defined(SNLED27351_I2C_ADDRESS_4)
snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_4, 3);
# endif
# endif
#endif
}
void snled27351_sw_return_normal(uint8_t addr) {
// Select to function page
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE);
// Setting LED driver to normal mode
snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_NORMAL_MODE);
}
void snled27351_sw_shutdown(uint8_t addr) {
// Select to function page
snled27351_write_register(addr, SNLED27351_REG_CONFIGURE_CMD_PAGE, SNLED27351_FUNCTION_PAGE);
// Setting LED driver to shutdown mode
snled27351_write_register(addr, SNLED27351_REG_CONFIGURATION, SNLED27351_MSKSW_SHUT_DOWN_MODE);
// Write SW Sleep Register
snled27351_write_register(addr, SNLED27351_REG_SOFTWARE_SLEEP, SNLED27351_MSKSLEEP_ENABLE);
}
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