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2014-01-11 13:24:32 +00:00
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/*
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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 "led_matrix.h"
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2014-01-13 13:04:24 +00:00
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#define LED_MATRIX_TIMER_TOP F_CPU/(256*64)/LED_MATRIX_ROWS
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void led_matrix_init(void)
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{
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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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