142 lines
4.5 KiB
C
142 lines
4.5 KiB
C
/* Copyright 2021 Jasper Chan
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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 "aw20216.h"
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#include "spi_master.h"
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/* The AW20216 appears to be somewhat similar to the IS31FL743, although quite
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* a few things are different, such as the command byte format and page ordering.
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* The LED addresses start from 0x00 instead of 0x01.
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*/
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#define AWINIC_ID 0b1010 << 4
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#define AW_PAGE_FUNCTION 0x00 << 1 // PG0, Function registers
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#define AW_PAGE_PWM 0x01 << 1 // PG1, LED PWM control
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#define AW_PAGE_SCALING 0x02 << 1 // PG2, LED current scaling control
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#define AW_PAGE_PATCHOICE 0x03 << 1 // PG3, Pattern choice?
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#define AW_PAGE_PWMSCALING 0x04 << 1 // PG4, LED PWM + Scaling control?
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#define AW_WRITE 0
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#define AW_READ 1
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#define AW_REG_CONFIGURATION 0x00 // PG0
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#define AW_REG_GLOBALCURRENT 0x01 // PG0
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// Default value of AW_REG_CONFIGURATION
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// D7:D4 = 1011, SWSEL (SW1~SW12 active)
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// D3 = 0?, reserved (apparently this should be 1 but it doesn't seem to matter)
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// D2:D1 = 00, OSDE (open/short detection enable)
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// D0 = 0, CHIPEN (write 1 to enable LEDs when hardware enable pulled high)
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#define AW_CONFIG_DEFAULT 0b10110000
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#define AW_CHIPEN 1
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#define AW_PWM_REGISTER_COUNT 216
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#ifndef AW_SCALING_MAX
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# define AW_SCALING_MAX 150
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#endif
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#ifndef AW_GLOBAL_CURRENT_MAX
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# define AW_GLOBAL_CURRENT_MAX 150
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#endif
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#ifndef AW_SPI_DIVISOR
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# define AW_SPI_DIVISOR 4
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#endif
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uint8_t g_pwm_buffer[DRIVER_COUNT][AW_PWM_REGISTER_COUNT];
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bool g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
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bool AW20216_write(pin_t cs_pin, uint8_t page, uint8_t reg, uint8_t* data, uint8_t len) {
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static uint8_t s_spi_transfer_buffer[2] = {0};
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if (!spi_start(cs_pin, false, 0, AW_SPI_DIVISOR)) {
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spi_stop();
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return false;
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}
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s_spi_transfer_buffer[0] = (AWINIC_ID | page | AW_WRITE);
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s_spi_transfer_buffer[1] = reg;
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if (spi_transmit(s_spi_transfer_buffer, 2) != SPI_STATUS_SUCCESS) {
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spi_stop();
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return false;
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}
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if (spi_transmit(data, len) != SPI_STATUS_SUCCESS) {
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spi_stop();
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return false;
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}
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spi_stop();
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return true;
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}
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static inline bool AW20216_write_register(pin_t cs_pin, uint8_t page, uint8_t reg, uint8_t value) {
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// Little wrapper so callers need not care about sending a buffer
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return AW20216_write(cs_pin, page, reg, &value, 1);
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}
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static void AW20216_init_scaling(pin_t cs_pin) {
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// Set constant current to the max, control brightness with PWM
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for (uint8_t i = 0; i < AW_PWM_REGISTER_COUNT; i++) {
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AW20216_write_register(cs_pin, AW_PAGE_SCALING, i, AW_SCALING_MAX);
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}
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}
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static inline void AW20216_init_current_limit(pin_t cs_pin) {
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// Push config
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AW20216_write_register(cs_pin, AW_PAGE_FUNCTION, AW_REG_GLOBALCURRENT, AW_GLOBAL_CURRENT_MAX);
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}
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static inline void AW20216_soft_enable(pin_t cs_pin) {
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// Push config
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AW20216_write_register(cs_pin, AW_PAGE_FUNCTION, AW_REG_CONFIGURATION, AW_CONFIG_DEFAULT | AW_CHIPEN);
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}
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void AW20216_init(pin_t cs_pin, pin_t en_pin) {
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setPinOutput(en_pin);
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writePinHigh(en_pin);
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// Drivers should start with all scaling and PWM registers as off
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AW20216_init_current_limit(cs_pin);
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AW20216_init_scaling(cs_pin);
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AW20216_soft_enable(cs_pin);
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}
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void AW20216_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
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aw_led led = g_aw_leds[index];
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g_pwm_buffer[led.driver][led.r] = red;
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g_pwm_buffer[led.driver][led.g] = green;
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g_pwm_buffer[led.driver][led.b] = blue;
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g_pwm_buffer_update_required[led.driver] = true;
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}
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void AW20216_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
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for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) {
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AW20216_set_color(i, red, green, blue);
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}
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}
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void AW20216_update_pwm_buffers(pin_t cs_pin, uint8_t index) {
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if (g_pwm_buffer_update_required[index]) {
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AW20216_write(cs_pin, AW_PAGE_PWM, 0, g_pwm_buffer[index], AW_PWM_REGISTER_COUNT);
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}
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g_pwm_buffer_update_required[index] = false;
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}
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