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103 lines
3.2 KiB
103 lines
3.2 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_pinmatrix.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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* FIXME: Map this from the wiring matrix to a physical location matrix at some point
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*/
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uint8_t g_pwm_buffer[LED_MATRIX_ROWS * LED_MATRIX_COLS];
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const pin_t led_row_pins[LED_MATRIX_ROWS] = LED_MATRIX_ROW_PINS;
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const pin_t led_col_pins[LED_MATRIX_COLS] = LED_MATRIX_COL_PINS;
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void led_matrix_pinmatrix_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_MATRIX_ROWS; x++) {
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setPinOutput(led_row_pins[x]);
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writePinLow(led_row_pins[x]);
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}
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for (uint8_t x = 0; x < LED_MATRIX_COLS; x++) {
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setPinOutput(led_col_pins[x]);
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writePinLow(led_col_pins[x]);
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}
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}
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void led_matrix_pinmatrix_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_pinmatrix_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_pinmatrix_set_value(i, value);
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}
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}
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void led_matrix_pinmatrix_flush(void) {
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/* This is a basic bit-banged pwm implementation.
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*/
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uint8_t led_count = 0;
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for (uint8_t row = 0; row < LED_MATRIX_ROWS; row++) {
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writePinLow(led_row_pins[row]);
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for (uint8_t col = 0; col < LED_MATRIX_COLS; col++) {
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/* We spend ~128us on each LED, dividing that time between lit and unlit.
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*/
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const uint8_t brightness = pgm_read_byte(&CIE1931_CURVE[g_pwm_buffer[led_count]]) / 2;
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if (brightness > 0) {
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writePinHigh(led_col_pins[col]);
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for (int i = 0; i < 128; i++) {
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if (i == brightness) {
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writePinLow(led_col_pins[col]);
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}
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led_wait_us(1);
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}
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} else {
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led_wait_us(128);
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}
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led_count++;
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}
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}
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}
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