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- /* Copyright 2018 Jason Williams (Wilba)
- * 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 "is31fl3736.h"
- #include <string.h>
- #include "i2c_master.h"
- #include "wait.h"
-
- #define IS31FL3736_PWM_REGISTER_COUNT 192 // actually 96
- #define IS31FL3736_LED_CONTROL_REGISTER_COUNT 24
-
- #ifndef IS31FL3736_I2C_TIMEOUT
- # define IS31FL3736_I2C_TIMEOUT 100
- #endif
-
- #ifndef IS31FL3736_I2C_PERSISTENCE
- # define IS31FL3736_I2C_PERSISTENCE 0
- #endif
-
- #ifndef IS31FL3736_PWM_FREQUENCY
- # define IS31FL3736_PWM_FREQUENCY IS31FL3736_PWM_FREQUENCY_8K4_HZ // PFS - IS31FL3736B only
- #endif
-
- #ifndef IS31FL3736_SW_PULLUP
- # define IS31FL3736_SW_PULLUP IS31FL3736_PUR_0_OHM
- #endif
-
- #ifndef IS31FL3736_CS_PULLDOWN
- # define IS31FL3736_CS_PULLDOWN IS31FL3736_PDR_0_OHM
- #endif
-
- #ifndef IS31FL3736_GLOBAL_CURRENT
- # define IS31FL3736_GLOBAL_CURRENT 0xFF
- #endif
-
- uint8_t i2c_transfer_buffer[20];
-
- // These buffers match the IS31FL3736 PWM registers.
- // The control buffers match the page 0 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 is31fl3736_write_pwm_buffer() but it's
- // probably not worth the extra complexity.
- uint8_t g_pwm_buffer[IS31FL3736_DRIVER_COUNT][IS31FL3736_PWM_REGISTER_COUNT];
- bool g_pwm_buffer_update_required[IS31FL3736_DRIVER_COUNT] = {false};
-
- uint8_t g_led_control_registers[IS31FL3736_DRIVER_COUNT][IS31FL3736_LED_CONTROL_REGISTER_COUNT] = {0};
- bool g_led_control_registers_update_required[IS31FL3736_DRIVER_COUNT] = {false};
-
- void is31fl3736_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
- i2c_transfer_buffer[0] = reg;
- i2c_transfer_buffer[1] = data;
-
- #if IS31FL3736_I2C_PERSISTENCE > 0
- for (uint8_t i = 0; i < IS31FL3736_I2C_PERSISTENCE; i++) {
- if (i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3736_I2C_TIMEOUT) == 0) break;
- }
- #else
- i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3736_I2C_TIMEOUT);
- #endif
- }
-
- void is31fl3736_select_page(uint8_t addr, uint8_t page) {
- is31fl3736_write_register(addr, IS31FL3736_REG_COMMAND_WRITE_LOCK, IS31FL3736_COMMAND_WRITE_LOCK_MAGIC);
- is31fl3736_write_register(addr, IS31FL3736_REG_COMMAND, page);
- }
-
- void is31fl3736_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
- // assumes page 1 is already selected
-
- // transmit PWM registers in 12 transfers of 16 bytes
- // i2c_transfer_buffer[] is 20 bytes
-
- // iterate over the pwm_buffer contents at 16 byte intervals
- for (int i = 0; i < IS31FL3736_PWM_REGISTER_COUNT; i += 16) {
- i2c_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
- memcpy(i2c_transfer_buffer + 1, pwm_buffer + i, 16);
-
- #if IS31FL3736_I2C_PERSISTENCE > 0
- for (uint8_t i = 0; i < IS31FL3736_I2C_PERSISTENCE; i++) {
- if (i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3736_I2C_TIMEOUT) == 0) break;
- }
- #else
- i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3736_I2C_TIMEOUT);
- #endif
- }
- }
-
- void is31fl3736_init_drivers(void) {
- i2c_init();
-
- is31fl3736_init(IS31FL3736_I2C_ADDRESS_1);
- #if defined(IS31FL3736_I2C_ADDRESS_2)
- is31fl3736_init(IS31FL3736_I2C_ADDRESS_2);
- # if defined(IS31FL3736_I2C_ADDRESS_3)
- is31fl3736_init(IS31FL3736_I2C_ADDRESS_3);
- # if defined(IS31FL3736_I2C_ADDRESS_4)
- is31fl3736_init(IS31FL3736_I2C_ADDRESS_4);
- # endif
- # endif
- #endif
-
- for (int i = 0; i < IS31FL3736_LED_COUNT; i++) {
- is31fl3736_set_led_control_register(i, true, true, true);
- }
-
- is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_1, 0);
- #if defined(IS31FL3736_I2C_ADDRESS_2)
- is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_2, 1);
- # if defined(IS31FL3736_I2C_ADDRESS_3)
- is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_3, 2);
- # if defined(IS31FL3736_I2C_ADDRESS_4)
- is31fl3736_update_led_control_registers(IS31FL3736_I2C_ADDRESS_4, 3);
- # endif
- # endif
- #endif
- }
-
- void is31fl3736_init(uint8_t addr) {
- // In order to avoid the LEDs being driven with garbage data
- // in the LED driver's PWM registers, shutdown is enabled last.
- // Set up the mode and other settings, clear the PWM registers,
- // then disable software shutdown.
-
- is31fl3736_select_page(addr, IS31FL3736_COMMAND_LED_CONTROL);
-
- // Turn off all LEDs.
- for (int i = 0; i < IS31FL3736_LED_CONTROL_REGISTER_COUNT; i++) {
- is31fl3736_write_register(addr, i, 0x00);
- }
-
- is31fl3736_select_page(addr, IS31FL3736_COMMAND_PWM);
-
- // Set PWM on all LEDs to 0
- // No need to setup Breath registers to PWM as that is the default.
- for (int i = 0; i < IS31FL3736_PWM_REGISTER_COUNT; i++) {
- is31fl3736_write_register(addr, i, 0x00);
- }
-
- is31fl3736_select_page(addr, IS31FL3736_COMMAND_FUNCTION);
-
- // Set de-ghost pull-up resistors (SWx)
- is31fl3736_write_register(addr, IS31FL3736_FUNCTION_REG_SW_PULLUP, IS31FL3736_SW_PULLUP);
- // Set de-ghost pull-down resistors (CSx)
- is31fl3736_write_register(addr, IS31FL3736_FUNCTION_REG_CS_PULLDOWN, IS31FL3736_CS_PULLDOWN);
- // Set global current to maximum.
- is31fl3736_write_register(addr, IS31FL3736_FUNCTION_REG_GLOBAL_CURRENT, IS31FL3736_GLOBAL_CURRENT);
- // Disable software shutdown.
- is31fl3736_write_register(addr, IS31FL3736_FUNCTION_REG_CONFIGURATION, ((IS31FL3736_PWM_FREQUENCY & 0b111) << 3) | 0x01);
-
- // Wait 10ms to ensure the device has woken up.
- wait_ms(10);
- }
-
- void is31fl3736_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
- is31fl3736_led_t led;
- if (index >= 0 && index < IS31FL3736_LED_COUNT) {
- memcpy_P(&led, (&g_is31fl3736_leds[index]), sizeof(led));
-
- if (g_pwm_buffer[led.driver][led.r] == red && g_pwm_buffer[led.driver][led.g] == green && g_pwm_buffer[led.driver][led.b] == blue) {
- return;
- }
- g_pwm_buffer[led.driver][led.r] = red;
- g_pwm_buffer[led.driver][led.g] = green;
- g_pwm_buffer[led.driver][led.b] = blue;
- g_pwm_buffer_update_required[led.driver] = true;
- }
- }
-
- void is31fl3736_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
- for (int i = 0; i < IS31FL3736_LED_COUNT; i++) {
- is31fl3736_set_color(i, red, green, blue);
- }
- }
-
- void is31fl3736_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
- is31fl3736_led_t led;
- memcpy_P(&led, (&g_is31fl3736_leds[index]), sizeof(led));
-
- // The PWM register for a matrix position (0x00 to 0xBF) is interleaved, so:
- // A1=0x00 A2=0x02 A3=0x04 A4=0x06 A5=0x08 A6=0x0A A7=0x0C A8=0x0E
- // B1=0x10 B2=0x12 B3=0x14
- // But also, the LED control registers (0x00 to 0x17) are also interleaved, so:
- // A1-A4=0x00 A5-A8=0x01
-
- uint8_t control_register_r = led.r / 8;
- uint8_t control_register_g = led.g / 8;
- uint8_t control_register_b = led.b / 8;
-
- uint8_t bit_r = led.r % 8;
- uint8_t bit_g = led.g % 8;
- uint8_t bit_b = led.b % 8;
-
- if (red) {
- g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
- } else {
- g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
- }
- if (green) {
- g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
- } else {
- g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
- }
- if (blue) {
- g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
- } else {
- g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
- }
-
- g_led_control_registers_update_required[led.driver] = true;
- }
-
- void is31fl3736_update_pwm_buffers(uint8_t addr, uint8_t index) {
- if (g_pwm_buffer_update_required[index]) {
- is31fl3736_select_page(addr, IS31FL3736_COMMAND_PWM);
-
- is31fl3736_write_pwm_buffer(addr, g_pwm_buffer[index]);
- g_pwm_buffer_update_required[index] = false;
- }
- }
-
- void is31fl3736_update_led_control_registers(uint8_t addr, uint8_t index) {
- if (g_led_control_registers_update_required[index]) {
- is31fl3736_select_page(addr, IS31FL3736_COMMAND_LED_CONTROL);
-
- for (int i = 0; i < IS31FL3736_LED_CONTROL_REGISTER_COUNT; i++) {
- is31fl3736_write_register(addr, i, g_led_control_registers[index][i]);
- }
- g_led_control_registers_update_required[index] = false;
- }
- }
-
- void is31fl3736_flush(void) {
- is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_1, 0);
- #if defined(IS31FL3736_I2C_ADDRESS_2)
- is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_2, 1);
- # if defined(IS31FL3736_I2C_ADDRESS_3)
- is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_3, 2);
- # if defined(IS31FL3736_I2C_ADDRESS_4)
- is31fl3736_update_pwm_buffers(IS31FL3736_I2C_ADDRESS_4, 3);
- # endif
- # endif
- #endif
- }
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