135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
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/***************************************************************************
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* Copyright (C) 05/2006 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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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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* *
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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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* *
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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, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#define TIMER1_STEP 40
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#define TIMER1_RELOAD (0xFFFF - (256 * TIMER1_STEP))
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// rx variables
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static uint16_t rx_chan;
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static uint16_t my_base;
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// channel values
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static uint8_t chan[8] = { 0xFF, 0xC0, 0xB0, 0x80, 0x40, 0x20, 0x10, 0x00 };
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// next OCR1 value
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static uint8_t cnt;
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static uint16_t pwm_load;
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/*
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* Timer 1 Overflow (every 10ms)
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* - reload 10ms
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* - schedule compare match in 40us
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*/
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ISR(SIG_OVERFLOW1)
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{
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TCNT1 = TIMER1_RELOAD;
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OCR1 = (TIMER1_RELOAD + TIMER1_STEP);
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pwm_load = (TIMER1_RELOAD + (TIMER1_STEP * 2));
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cnt = 0x00;
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}
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/*
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* Timer 1 Compare Match (every 40us)
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* - schedule next compare match in 40us
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*/
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ISR(SIG_OUTPUT_COMPARE1A)
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{
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OCR1 = pwm_load;
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pwm_load += TIMER1_STEP;
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uint8_t *tmp = chan;
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cnt--;
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if (cnt == 0xFF)
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PORTB = 0x00;
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB0);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB1);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB2);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB3);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB4);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB5);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB6);
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if (*tmp++ >= cnt)
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PORTB |= (1<<PORTB7);
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}
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/*
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* DMX Receive (every 44us)
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* - count received bytes
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*/
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ISR(SIG_UART_RECV)
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{
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// FrameError & Data 0x00 -> Reset
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if (USR & (1<<FE)) {
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if (UDR == 0)
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rx_chan = 0;
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// Our 8 channels?
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} else if ((rx_chan & 0x1F8) == my_base) {
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chan[(rx_chan++ & 0x07)] = UDR;
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} else {
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uint8_t tmp = UDR;
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}
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}
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int main(void)
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{
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/* PortB as outputs */
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DDRB = 0xFF;
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PORTB = 0x00;
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/* Uart-Init: 250kBaud, 8n2, receive only */
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UBRR = 0x01;
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UCR = (1<<RXCIE) | (1<<RXEN) | (1<<CHR9);
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/* Timer Init: F_OSC/8, overflow & compare Int */
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TCCR1A = 0x00;
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TCCR1B = (1<<CS11);
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TIMSK = (1<<TOIE1) | (1<<OCIE1A);
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TCNT1 = TIMER1_RELOAD;
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/* Enable Interrupts */
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sei();
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while (1);
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return 0;
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}
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