diff options
Diffstat (limited to 'pwm.c')
| -rw-r--r-- | pwm.c | 60 |
1 files changed, 60 insertions, 0 deletions
@@ -0,0 +1,60 @@ +/* + * Copyright 2012 (C) Christian Franke <nobody at nowhere dot ws> + * + * 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 3 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/interrupt.h> +#include <avr/io.h> +#include <stdint.h> +#include <string.h> + +volatile uint16_t value_red = 3072; +volatile uint16_t value_green = 2048; +volatile uint16_t value_blue = 1024; + +void pwm_set_rgb(uint8_t r, uint8_t g, uint8_t b) +{ + value_red = r << 4; + value_green = g << 4; + value_blue = b << 4; +} + +void pwm_worker_loop(void) +{ + for (;;) { + if (value_red) + PORTA |= (1 << PA0); + if (value_green) + PORTA |= (1 << PA1); + if (value_blue) + PORTA |= (1 << PA2); + + for (uint16_t i = 0; i < 4096; i++) { + if (value_red < i) + PORTA &= ~(1 << PA0); + if (value_green < i) + PORTA &= ~(1 << PA1); + if (value_blue < i) + PORTA &= ~(1 << PA2); + } + } +} + +void pwm_init(void) +{ + PORTA = 0x00; + DDRA = (1 << PA0) | (1 << PA1) | (1 << PA2); +} |