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95 lines
2.8 KiB
95 lines
2.8 KiB
/* Copyright 2017 Jason Williams
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* Copyright 2018 Jack Humbert
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* Copyright 2019 Clueboard
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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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#ifdef __AVR__
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# include <avr/interrupt.h>
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# include <avr/io.h>
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# include <util/delay.h>
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# define led_wait_us(us) wait_us(us)
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#else
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# include "ch.h"
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# include "hal.h"
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# define led_wait_us(us) chSysPolledDelayX(US2RTC(STM32_SYSCLK, us))
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include "led_matrix_pins.h"
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#include "led_tables.h"
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#include "progmem.h"
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#include "quantum.h"
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#include "backlight.h"
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/*
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* g_pwm_buffer is an array that represents the duty cycle (0-255) for each LED.
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*/
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uint8_t g_pwm_buffer[LED_DRIVER_LED_COUNT];
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const pin_t led_pins[LED_DRIVER_LED_COUNT] = LED_MATRIX_PINS;
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#ifdef LED_MATRIX_PIN_SINK
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# define led_pin_on(pin) writePinLow(pin)
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# define led_pin_off(pin) writePinHigh(pin)
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#else
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# define led_pin_on(pin) writePinHigh(pin)
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# define led_pin_off(pin) writePinLow(pin)
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#endif
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void led_matrix_pins_init_pins(void) {
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/* Set all pins to output, we are not interested in reading any information.
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*/
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for (uint8_t x = 0; x < LED_DRIVER_LED_COUNT; x++) {
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setPinOutput(led_pins[x]);
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led_pin_off(led_pins[x]);
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}
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}
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void led_matrix_pins_set_value(int index, uint8_t value) {
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/* Set the brighness for a single LED.
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*/
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if (index >= 0 && index < LED_DRIVER_LED_COUNT) {
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g_pwm_buffer[index] = value;
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}
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}
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void led_matrix_pins_set_value_all(uint8_t value) {
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/* Set the brighness for all LEDs.
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*/
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for (int i = 0; i < LED_DRIVER_LED_COUNT; i++) {
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led_matrix_pins_set_value(i, value);
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}
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}
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void led_matrix_pins_flush(void) {
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/* This is a basic bit-banged pwm implementation.
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*/
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for (uint8_t i = 0; i < LED_DRIVER_LED_COUNT; i++) {
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/* We spend ~1.3ms on each LED, dividing that time between lit and unlit.
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*/
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if (g_pwm_buffer[i] > 0) {
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uint8_t brightness = pgm_read_byte(&CIE1931_CURVE[g_pwm_buffer[i]]) / 2;
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led_pin_on(led_pins[i]);
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led_wait_us(brightness);
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led_pin_off(led_pins[i]);
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led_wait_us(128 - brightness);
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} else {
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led_wait_us(128);
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}
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}
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}
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