272 lines
10 KiB
C
272 lines
10 KiB
C
/* Copyright 2021 @ Keychron (https://www.keychron.com)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "snled27351-mono.h"
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#include "i2c_master.h"
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#define SNLED27351_PWM_REGISTER_COUNT 192
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#define SNLED27351_LED_CONTROL_REGISTER_COUNT 24
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#ifndef SNLED27351_I2C_TIMEOUT
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# define SNLED27351_I2C_TIMEOUT 100
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#endif
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#ifndef SNLED27351_I2C_PERSISTENCE
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# define SNLED27351_I2C_PERSISTENCE 0
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#endif
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#ifndef SNLED27351_PHASE_CHANNEL
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# define SNLED27351_PHASE_CHANNEL SNLED27351_SCAN_PHASE_12_CHANNEL
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#endif
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#ifndef SNLED27351_CURRENT_TUNE
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# define SNLED27351_CURRENT_TUNE \
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{ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }
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#endif
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uint8_t i2c_transfer_buffer[20];
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// These buffers match the SNLED27351 PWM registers.
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// The control buffers match the PG0 LED On/Off registers.
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// Storing them like this is optimal for I2C transfers to the registers.
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// We could optimize this and take out the unused registers from these
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// buffers and the transfers in snled27351_write_pwm_buffer() but it's
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// probably not worth the extra complexity.
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uint8_t g_pwm_buffer[SNLED27351_DRIVER_COUNT][SNLED27351_PWM_REGISTER_COUNT];
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bool g_pwm_buffer_update_required[SNLED27351_DRIVER_COUNT] = {false};
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uint8_t g_led_control_registers[SNLED27351_DRIVER_COUNT][SNLED27351_LED_CONTROL_REGISTER_COUNT] = {0};
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bool g_led_control_registers_update_required[SNLED27351_DRIVER_COUNT] = {false};
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bool snled27351_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
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// If the transaction fails function returns false.
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i2c_transfer_buffer[0] = reg;
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i2c_transfer_buffer[1] = data;
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#if SNLED27351_I2C_PERSISTENCE > 0
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for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) {
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if (i2c_transmit(addr << 1, i2c_transfer_buffer, 2, SNLED27351_I2C_TIMEOUT) != 0) {
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return false;
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}
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}
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#else
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if (i2c_transmit(addr << 1, i2c_transfer_buffer, 2, SNLED27351_I2C_TIMEOUT) != 0) {
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return false;
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}
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#endif
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return true;
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}
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void snled27351_select_page(uint8_t addr, uint8_t page) {
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snled27351_write_register(addr, SNLED27351_REG_COMMAND, page);
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}
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bool snled27351_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
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// Assumes PG1 is already selected.
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// If any of the transactions fails function returns false.
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// Transmit PWM registers in 12 transfers of 16 bytes.
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// i2c_transfer_buffer[] is 20 bytes
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// Iterate over the pwm_buffer contents at 16 byte intervals.
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for (int i = 0; i < SNLED27351_PWM_REGISTER_COUNT; i += 16) {
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i2c_transfer_buffer[0] = i;
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// Copy the data from i to i+15.
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// Device will auto-increment register for data after the first byte
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// Thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer.
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for (int j = 0; j < 16; j++) {
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i2c_transfer_buffer[1 + j] = pwm_buffer[i + j];
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}
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#if SNLED27351_I2C_PERSISTENCE > 0
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for (uint8_t i = 0; i < SNLED27351_I2C_PERSISTENCE; i++) {
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if (i2c_transmit(addr << 1, i2c_transfer_buffer, 17, SNLED27351_I2C_TIMEOUT) != 0) {
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return false;
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}
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}
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#else
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if (i2c_transmit(addr << 1, i2c_transfer_buffer, 17, SNLED27351_I2C_TIMEOUT) != 0) {
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return false;
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}
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#endif
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}
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return true;
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}
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void snled27351_init_drivers(void) {
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i2c_init();
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snled27351_init(SNLED27351_I2C_ADDRESS_1);
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#if defined(SNLED27351_I2C_ADDRESS_2)
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snled27351_init(SNLED27351_I2C_ADDRESS_2);
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# if defined(SNLED27351_I2C_ADDRESS_3)
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snled27351_init(SNLED27351_I2C_ADDRESS_3);
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# if defined(SNLED27351_I2C_ADDRESS_4)
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snled27351_init(SNLED27351_I2C_ADDRESS_4);
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# endif
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# endif
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#endif
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for (int i = 0; i < SNLED27351_LED_COUNT; i++) {
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snled27351_set_led_control_register(i, true);
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}
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snled27351_update_led_control_registers(SNLED27351_I2C_ADDRESS_1, 0);
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#if defined(SNLED27351_I2C_ADDRESS_2)
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snled27351_update_led_control_registers(SNLED27351_I2C_ADDRESS_2, 1);
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# if defined(SNLED27351_I2C_ADDRESS_3)
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snled27351_update_led_control_registers(SNLED27351_I2C_ADDRESS_3, 2);
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# if defined(SNLED27351_I2C_ADDRESS_4)
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snled27351_update_led_control_registers(SNLED27351_I2C_ADDRESS_4, 3);
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# endif
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# endif
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#endif
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}
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void snled27351_init(uint8_t addr) {
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snled27351_select_page(addr, SNLED27351_COMMAND_FUNCTION);
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// Setting LED driver to shutdown mode
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_SHUTDOWN);
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// Setting internal channel pulldown/pullup
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_PULLDOWNUP, SNLED27351_PULLDOWNUP_ALL_ENABLED);
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// Select number of scan phase
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SCAN_PHASE, SNLED27351_PHASE_CHANNEL);
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// Setting PWM Delay Phase
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SLEW_RATE_CONTROL_MODE_1, SNLED27351_SLEW_RATE_CONTROL_MODE_1_PDP_ENABLE);
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// Setting Driving/Sinking Channel Slew Rate
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SLEW_RATE_CONTROL_MODE_2, SNLED27351_SLEW_RATE_CONTROL_MODE_2_DSL_ENABLE | SNLED27351_SLEW_RATE_CONTROL_MODE_2_SSL_ENABLE);
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// Setting Iref
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SOFTWARE_SLEEP, 0);
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snled27351_select_page(addr, SNLED27351_COMMAND_LED_CONTROL);
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for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) {
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snled27351_write_register(addr, i, 0x00);
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}
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snled27351_select_page(addr, SNLED27351_COMMAND_PWM);
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for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) {
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snled27351_write_register(addr, i, 0x00);
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}
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snled27351_select_page(addr, SNLED27351_COMMAND_CURRENT_TUNE);
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uint8_t current_tune_reg_list[SNLED27351_LED_CURRENT_TUNE_LENGTH] = SNLED27351_CURRENT_TUNE;
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for (int i = 0; i < SNLED27351_LED_CURRENT_TUNE_LENGTH; i++) {
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snled27351_write_register(addr, i, current_tune_reg_list[i]);
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}
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snled27351_select_page(addr, SNLED27351_COMMAND_LED_CONTROL);
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// Enable LEDs ON/OFF
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for (int i = 0; i < SNLED27351_LED_CONTROL_ON_OFF_LENGTH; i++) {
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snled27351_write_register(addr, i, 0xFF);
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}
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snled27351_select_page(addr, SNLED27351_COMMAND_FUNCTION);
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// Setting LED driver to normal mode
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_NORMAL);
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}
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void snled27351_set_value(int index, uint8_t value) {
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snled27351_led_t led;
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if (index >= 0 && index < SNLED27351_LED_COUNT) {
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memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led));
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if (g_pwm_buffer[led.driver][led.v] == value) {
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return;
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}
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g_pwm_buffer[led.driver][led.v] = value;
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g_pwm_buffer_update_required[led.driver] = true;
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}
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}
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void snled27351_set_value_all(uint8_t value) {
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for (int i = 0; i < SNLED27351_LED_COUNT; i++) {
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snled27351_set_value(i, value);
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}
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}
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void snled27351_set_led_control_register(uint8_t index, bool value) {
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snled27351_led_t led;
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memcpy_P(&led, (&g_snled27351_leds[index]), sizeof(led));
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uint8_t control_register = led.v / 8;
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uint8_t bit_value = led.v % 8;
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if (value) {
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g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
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} else {
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g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
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}
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g_led_control_registers_update_required[led.driver] = true;
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}
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void snled27351_update_pwm_buffers(uint8_t addr, uint8_t index) {
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if (g_pwm_buffer_update_required[index]) {
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snled27351_select_page(addr, SNLED27351_COMMAND_PWM);
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// If any of the transactions fail we risk writing dirty PG0,
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// refresh page 0 just in case.
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if (!snled27351_write_pwm_buffer(addr, g_pwm_buffer[index])) {
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g_led_control_registers_update_required[index] = true;
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}
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}
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g_pwm_buffer_update_required[index] = false;
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}
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void snled27351_update_led_control_registers(uint8_t addr, uint8_t index) {
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if (g_led_control_registers_update_required[index]) {
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snled27351_select_page(addr, SNLED27351_COMMAND_LED_CONTROL);
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for (int i = 0; i < SNLED27351_LED_CONTROL_REGISTER_COUNT; i++) {
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snled27351_write_register(addr, i, g_led_control_registers[index][i]);
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}
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}
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g_led_control_registers_update_required[index] = false;
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}
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void snled27351_flush(void) {
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snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_1, 0);
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#if defined(SNLED27351_I2C_ADDRESS_2)
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snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_2, 1);
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# if defined(SNLED27351_I2C_ADDRESS_3)
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snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_3, 2);
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# if defined(SNLED27351_I2C_ADDRESS_4)
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snled27351_update_pwm_buffers(SNLED27351_I2C_ADDRESS_4, 3);
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# endif
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# endif
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#endif
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}
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void snled27351_sw_return_normal(uint8_t addr) {
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snled27351_select_page(addr, SNLED27351_COMMAND_FUNCTION);
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// Setting LED driver to normal mode
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_NORMAL);
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}
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void snled27351_sw_shutdown(uint8_t addr) {
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snled27351_select_page(addr, SNLED27351_COMMAND_FUNCTION);
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// Setting LED driver to shutdown mode
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SOFTWARE_SHUTDOWN, SNLED27351_SOFTWARE_SHUTDOWN_SSD_SHUTDOWN);
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// Write SW Sleep Register
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snled27351_write_register(addr, SNLED27351_FUNCTION_REG_SOFTWARE_SLEEP, SNLED27351_SOFTWARE_SLEEP_ENABLE);
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}
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