241 lines
8.1 KiB
C
241 lines
8.1 KiB
C
/* Copyright 2018 Jason Williams (Wilba)
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* Copyright 2021 Doni Crosby
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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 "is31fl3736-mono.h"
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#include "i2c_master.h"
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#include "gpio.h"
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#include "wait.h"
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#define IS31FL3736_PWM_REGISTER_COUNT 192 // actually 96
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#define IS31FL3736_LED_CONTROL_REGISTER_COUNT 24
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#ifndef IS31FL3736_I2C_TIMEOUT
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# define IS31FL3736_I2C_TIMEOUT 100
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#endif
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#ifndef IS31FL3736_I2C_PERSISTENCE
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# define IS31FL3736_I2C_PERSISTENCE 0
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#endif
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#ifndef IS31FL3736_PWM_FREQUENCY
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# define IS31FL3736_PWM_FREQUENCY IS31FL3736_PWM_FREQUENCY_8K4_HZ // PFS - IS31FL3736B only
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#endif
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#ifndef IS31FL3736_SW_PULLUP
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# define IS31FL3736_SW_PULLUP IS31FL3736_PUR_0_OHM
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#endif
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#ifndef IS31FL3736_CS_PULLDOWN
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# define IS31FL3736_CS_PULLDOWN IS31FL3736_PDR_0_OHM
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#endif
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#ifndef IS31FL3736_GLOBAL_CURRENT
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# define IS31FL3736_GLOBAL_CURRENT 0xFF
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#endif
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const uint8_t i2c_addresses[IS31FL3736_DRIVER_COUNT] = {
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IS31FL3736_I2C_ADDRESS_1,
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#ifdef IS31FL3736_I2C_ADDRESS_2
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IS31FL3736_I2C_ADDRESS_2,
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# ifdef IS31FL3736_I2C_ADDRESS_3
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IS31FL3736_I2C_ADDRESS_3,
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# ifdef IS31FL3736_I2C_ADDRESS_4
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IS31FL3736_I2C_ADDRESS_4,
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# endif
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# endif
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#endif
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};
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// These buffers match the IS31FL3736 PWM registers.
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// The control buffers match the page 0 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 is31fl3736_write_pwm_buffer() but it's
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// probably not worth the extra complexity.
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typedef struct is31fl3736_driver_t {
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uint8_t pwm_buffer[IS31FL3736_PWM_REGISTER_COUNT];
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bool pwm_buffer_dirty;
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uint8_t led_control_buffer[IS31FL3736_LED_CONTROL_REGISTER_COUNT];
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bool led_control_buffer_dirty;
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} PACKED is31fl3736_driver_t;
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is31fl3736_driver_t driver_buffers[IS31FL3736_DRIVER_COUNT] = {{
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.pwm_buffer = {0},
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.pwm_buffer_dirty = false,
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.led_control_buffer = {0},
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.led_control_buffer_dirty = false,
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}};
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void is31fl3736_write_register(uint8_t index, uint8_t reg, uint8_t data) {
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#if IS31FL3736_I2C_PERSISTENCE > 0
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for (uint8_t i = 0; i < IS31FL3736_I2C_PERSISTENCE; i++) {
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if (i2c_write_register(i2c_addresses[index] << 1, reg, &data, 1, IS31FL3736_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
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}
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#else
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i2c_write_register(i2c_addresses[index] << 1, reg, &data, 1, IS31FL3736_I2C_TIMEOUT);
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#endif
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}
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void is31fl3736_select_page(uint8_t index, uint8_t page) {
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is31fl3736_write_register(index, IS31FL3736_REG_COMMAND_WRITE_LOCK, IS31FL3736_COMMAND_WRITE_LOCK_MAGIC);
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is31fl3736_write_register(index, IS31FL3736_REG_COMMAND, page);
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}
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void is31fl3736_write_pwm_buffer(uint8_t index) {
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// Assumes page 1 is already selected.
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// Transmit PWM registers in 12 transfers of 16 bytes.
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// Iterate over the pwm_buffer contents at 16 byte intervals.
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for (uint8_t i = 0; i < IS31FL3736_PWM_REGISTER_COUNT; i += 16) {
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#if IS31FL3736_I2C_PERSISTENCE > 0
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for (uint8_t j = 0; j < IS31FL3736_I2C_PERSISTENCE; j++) {
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if (i2c_write_register(i2c_addresses[index] << 1, i, driver_buffers[index].pwm_buffer + i, 16, IS31FL3736_I2C_TIMEOUT) == I2C_STATUS_SUCCESS) break;
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}
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#else
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i2c_write_register(i2c_addresses[index] << 1, i, driver_buffers[index].pwm_buffer + i, 16, IS31FL3736_I2C_TIMEOUT);
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#endif
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}
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}
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void is31fl3736_init_drivers(void) {
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i2c_init();
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#if defined(IS31FL3736_SDB_PIN)
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gpio_set_pin_output(IS31FL3736_SDB_PIN);
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gpio_write_pin_high(IS31FL3736_SDB_PIN);
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#endif
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for (uint8_t i = 0; i < IS31FL3736_DRIVER_COUNT; i++) {
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is31fl3736_init(i);
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}
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for (int i = 0; i < IS31FL3736_LED_COUNT; i++) {
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is31fl3736_set_led_control_register(i, true);
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}
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for (uint8_t i = 0; i < IS31FL3736_DRIVER_COUNT; i++) {
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is31fl3736_update_led_control_registers(i);
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}
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}
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void is31fl3736_init(uint8_t index) {
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// In order to avoid the LEDs being driven with garbage data
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// in the LED driver's PWM registers, shutdown is enabled last.
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// Set up the mode and other settings, clear the PWM registers,
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// then disable software shutdown.
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is31fl3736_select_page(index, IS31FL3736_COMMAND_LED_CONTROL);
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// Turn off all LEDs.
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for (uint8_t i = 0; i < IS31FL3736_LED_CONTROL_REGISTER_COUNT; i++) {
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is31fl3736_write_register(index, i, 0x00);
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}
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is31fl3736_select_page(index, IS31FL3736_COMMAND_PWM);
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// Set PWM on all LEDs to 0
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// No need to setup Breath registers to PWM as that is the default.
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for (uint8_t i = 0; i < IS31FL3736_PWM_REGISTER_COUNT; i++) {
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is31fl3736_write_register(index, i, 0x00);
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}
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is31fl3736_select_page(index, IS31FL3736_COMMAND_FUNCTION);
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// Set de-ghost pull-up resistors (SWx)
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is31fl3736_write_register(index, IS31FL3736_FUNCTION_REG_SW_PULLUP, IS31FL3736_SW_PULLUP);
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// Set de-ghost pull-down resistors (CSx)
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is31fl3736_write_register(index, IS31FL3736_FUNCTION_REG_CS_PULLDOWN, IS31FL3736_CS_PULLDOWN);
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// Set global current to maximum.
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is31fl3736_write_register(index, IS31FL3736_FUNCTION_REG_GLOBAL_CURRENT, IS31FL3736_GLOBAL_CURRENT);
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// Disable software shutdown.
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is31fl3736_write_register(index, IS31FL3736_FUNCTION_REG_CONFIGURATION, ((IS31FL3736_PWM_FREQUENCY & 0b111) << 3) | 0x01);
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// Wait 10ms to ensure the device has woken up.
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wait_ms(10);
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}
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void is31fl3736_set_value(int index, uint8_t value) {
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is31fl3736_led_t led;
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if (index >= 0 && index < IS31FL3736_LED_COUNT) {
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memcpy_P(&led, (&g_is31fl3736_leds[index]), sizeof(led));
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if (driver_buffers[led.driver].pwm_buffer[led.v] == value) {
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return;
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}
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driver_buffers[led.driver].pwm_buffer[led.v] = value;
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driver_buffers[led.driver].pwm_buffer_dirty = true;
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}
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}
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void is31fl3736_set_value_all(uint8_t value) {
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for (int i = 0; i < IS31FL3736_LED_COUNT; i++) {
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is31fl3736_set_value(i, value);
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}
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}
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void is31fl3736_set_led_control_register(uint8_t index, bool value) {
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is31fl3736_led_t led;
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memcpy_P(&led, (&g_is31fl3736_leds[index]), sizeof(led));
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// The PWM register for a matrix position (0x00 to 0xBF) is interleaved, so:
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// A1=0x00 A2=0x02 A3=0x04 A4=0x06 A5=0x08 A6=0x0A A7=0x0C A8=0x0E
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// B1=0x10 B2=0x12 B3=0x14
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// But also, the LED control registers (0x00 to 0x17) are also interleaved, so:
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// A1-A4=0x00 A5-A8=0x01
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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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driver_buffers[led.driver].led_control_buffer[control_register] |= (1 << bit_value);
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} else {
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driver_buffers[led.driver].led_control_buffer[control_register] &= ~(1 << bit_value);
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}
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driver_buffers[led.driver].led_control_buffer_dirty = true;
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}
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void is31fl3736_update_pwm_buffers(uint8_t index) {
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if (driver_buffers[index].pwm_buffer_dirty) {
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is31fl3736_select_page(index, IS31FL3736_COMMAND_PWM);
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is31fl3736_write_pwm_buffer(index);
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driver_buffers[index].pwm_buffer_dirty = false;
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}
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}
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void is31fl3736_update_led_control_registers(uint8_t index) {
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if (driver_buffers[index].led_control_buffer_dirty) {
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is31fl3736_select_page(index, IS31FL3736_COMMAND_LED_CONTROL);
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for (uint8_t i = 0; i < IS31FL3736_LED_CONTROL_REGISTER_COUNT; i++) {
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is31fl3736_write_register(index, i, driver_buffers[index].led_control_buffer[i]);
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}
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driver_buffers[index].led_control_buffer_dirty = false;
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}
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}
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void is31fl3736_flush(void) {
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for (uint8_t i = 0; i < IS31FL3736_DRIVER_COUNT; i++) {
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is31fl3736_update_pwm_buffers(i);
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}
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}
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