92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
/*
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Copyright 2013,2014 Kai Ryu <kai1103@gmail.com>
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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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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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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 <avr/io.h>
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#include <avr/interrupt.h>
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#include <util/delay.h>
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#include "led_matrix.h"
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#define LED_MATRIX_TIMER_TOP F_CPU/(256*64)/LED_MATRIX_ROWS
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static led_matrix_element_t led_matrix[LED_MATRIX_ROWS][LED_MATRIX_COLS];
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void led_matrix_init(void)
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{
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led_matrix_unselect_rows();
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led_matrix_write_cols(0);
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/* Timer1 setup */
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/* CTC mode */
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TCCR1B |= (1<<WGM12);
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/* Clock selelct: clk/1 */
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TCCR1B |= (1<<CS10);
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/* Set TOP value */
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uint8_t sreg = SREG;
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cli();
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OCR1AH = (LED_MATRIX_TIMER_TOP >> 8) & 0xFF;
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OCR1AL = LED_MATRIX_TIMER_TOP & 0xFF;
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SREG = sreg;
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}
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void led_matrix_enable(void)
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{
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/* Enable Compare Match Interrupt */
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TIMSK1 |= _BV(OCIE1A);
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}
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void led_matrix_disable(void)
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{
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/* Disable Compare Match Interrupt */
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TIMSK1 &= ~_BV(OCIE1A);
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}
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inline
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led_matrix_row_t led_matrix_make_cols(uint8_t row, uint8_t pwm)
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{
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led_matrix_row_t cols = 0;
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for (uint8_t i = 0; i < LED_MATRIX_COLS; i++) {
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cols |= ((led_matrix[row][i].value < pwm ? 1 : 0) << i);
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}
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return cols;
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}
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inline
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void led_matrix_set_value(uint8_t row, uint8_t col, uint8_t value)
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{
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led_matrix[row][col].value = value;
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}
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inline
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void led_matrix_set_delta(uint8_t row, uint8_t col, int8_t delta)
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{
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led_matrix[row][col].delta = delta;
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}
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ISR(TIMER1_COMPA_vect)
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{
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static uint8_t row = 0;
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static uint8_t pwm = 0;
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row = (row + 1) % LED_MATRIX_ROWS;
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pwm++;
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led_matrix_select_row(row);
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_delay_us(10);
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led_matrix_write_cols(led_matrix_make_cols(row, pwm));
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_delay_us(10);
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led_matrix_unselect_rows();
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}
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