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- /*
- Copyright 2013,2014 Kai Ryu <[email protected]>
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include <avr/io.h>
- #include <avr/interrupt.h>
- #include <util/delay.h>
- #include "led_matrix.h"
-
- #define LED_MATRIX_TIMER_TOP F_CPU/(256*64)/LED_MATRIX_ROWS
-
- static led_matrix_element_t led_matrix[LED_MATRIX_ROWS][LED_MATRIX_COLS];
-
- void led_matrix_init(void)
- {
- led_matrix_unselect_rows();
- led_matrix_write_cols(0);
- /* Timer1 setup */
- /* CTC mode */
- TCCR1B |= (1<<WGM12);
- /* Clock selelct: clk/1 */
- TCCR1B |= (1<<CS10);
- /* Set TOP value */
- uint8_t sreg = SREG;
- cli();
- OCR1AH = (LED_MATRIX_TIMER_TOP >> 8) & 0xFF;
- OCR1AL = LED_MATRIX_TIMER_TOP & 0xFF;
- SREG = sreg;
- }
-
- void led_matrix_enable(void)
- {
- /* Enable Compare Match Interrupt */
- TIMSK1 |= _BV(OCIE1A);
- }
-
- void led_matrix_disable(void)
- {
- /* Disable Compare Match Interrupt */
- TIMSK1 &= ~_BV(OCIE1A);
- }
-
- inline
- led_matrix_row_t led_matrix_make_cols(uint8_t row, uint8_t pwm)
- {
- led_matrix_row_t cols = 0;
- for (uint8_t i = 0; i < LED_MATRIX_COLS; i++) {
- cols |= ((led_matrix[row][i].value < pwm ? 1 : 0) << i);
- }
- return cols;
- }
-
- inline
- void led_matrix_set_value(uint8_t row, uint8_t col, uint8_t value)
- {
- led_matrix[row][col].value = value;
- }
-
- inline
- void led_matrix_set_delta(uint8_t row, uint8_t col, int8_t delta)
- {
- led_matrix[row][col].delta = delta;
- }
-
- ISR(TIMER1_COMPA_vect)
- {
- static uint8_t row = 0;
- static uint8_t pwm = 0;
-
- row = (row + 1) % LED_MATRIX_ROWS;
- pwm++;
-
- led_matrix_select_row(row);
- _delay_us(10);
- led_matrix_write_cols(led_matrix_make_cols(row, pwm));
- _delay_us(10);
- led_matrix_unselect_rows();
- }
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