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/*
* 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>
#include "shiftbrite.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 = (uint16_t)r * r >> 4;
value_green = (uint16_t)g * g >> 4;
value_blue = (uint16_t)b * b >> 4;
}
void pwm_tick(void)
{
for (uint16_t i = 0; i < 4096; i++) {
/* this should take about the same time for each iteration, regardless of pulse width */
PORTA= (PORTA & ~((1<<PA0)|(1<<PA1)|(1<<PA2))) |
(value_red > i? (1<<PA0): 0) |
(value_green > i? (1<<PA1): 0) |
(value_blue > i? (1<<PA2): 0);
}
}
void pwm_init(void)
{
PORTA = 0x00;
DDRA = (1 << PA0) | (1 << PA1) | (1 << PA2);
}
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