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initial version

master
Olaf Rempel 16 years ago
commit
4d6f3bfec9
  1. 71
      Makefile
  2. 134
      dmx8chan.c

71
Makefile

@ -0,0 +1,71 @@
PRG = dmx3chan
OBJ = dmx3chan.o
MCU_TARGET = at90s2313
OPTIMIZE = -Os
DEFS =
LIBS =
# You should not have to change anything below here.
CC = avr-gcc
# Override is only needed by avr-lib build system.
override CFLAGS = -g -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET) $(DEFS)
override LDFLAGS = -Wl,-Map,$(PRG).map
OBJCOPY = avr-objcopy
OBJDUMP = avr-objdump
SIZE = avr-size
all: $(PRG).elf lst text eeprom
$(SIZE) -x -A $(PRG).elf
$(PRG).elf: $(OBJ)
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
clean:
rm -rf *.o *.lst *.map $(PRG).elf *.hex *.bin *.srec
lst: $(PRG).lst
%.lst: %.elf
$(OBJDUMP) -h -S $< > $@
# Rules for building the .text rom images
text: hex bin srec
hex: $(PRG).hex
bin: $(PRG).bin
srec: $(PRG).srec
%.hex: %.elf
$(OBJCOPY) -j .text -j .data -O ihex $< $@
%.srec: %.elf
$(OBJCOPY) -j .text -j .data -O srec $< $@
%.bin: %.elf
$(OBJCOPY) -j .text -j .data -O binary $< $@
# Rules for building the .eeprom rom images
eeprom: ehex ebin esrec
ehex: $(PRG)_eeprom.hex
ebin: $(PRG)_eeprom.bin
esrec: $(PRG)_eeprom.srec
%_eeprom.hex: %.elf
$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
%_eeprom.srec: %.elf
$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O srec $< $@
%_eeprom.bin: %.elf
$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O binary $< $@
install: text
avrdude -p m16 -c butterfly -b 19200 -U flash:w:$(PRG).srec

134
dmx8chan.c

@ -0,0 +1,134 @@
/***************************************************************************
* Copyright (C) 05/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <avr/io.h>
#include <avr/interrupt.h>
#define TIMER1_STEP 40
#define TIMER1_RELOAD (0xFFFF - (256 * TIMER1_STEP))
// rx variables
static uint16_t rx_chan;
static uint16_t my_base;
// channel values
static uint8_t chan[8] = { 0xFF, 0xC0, 0xB0, 0x80, 0x40, 0x20, 0x10, 0x00 };
// next OCR1 value
static uint8_t cnt;
static uint16_t pwm_load;
/*
* Timer 1 Overflow (every 10ms)
* - reload 10ms
* - schedule compare match in 40us
*/
ISR(SIG_OVERFLOW1)
{
TCNT1 = TIMER1_RELOAD;
OCR1 = (TIMER1_RELOAD + TIMER1_STEP);
pwm_load = (TIMER1_RELOAD + (TIMER1_STEP * 2));
cnt = 0x00;
}
/*
* Timer 1 Compare Match (every 40us)
* - schedule next compare match in 40us
*/
ISR(SIG_OUTPUT_COMPARE1A)
{
OCR1 = pwm_load;
pwm_load += TIMER1_STEP;
uint8_t *tmp = chan;
cnt--;
if (cnt == 0xFF)
PORTB = 0x00;
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB0);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB1);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB2);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB3);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB4);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB5);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB6);
if (*tmp++ >= cnt)
PORTB |= (1<<PORTB7);
}
/*
* DMX Receive (every 44us)
* - count received bytes
*/
ISR(SIG_UART_RECV)
{
// FrameError & Data 0x00 -> Reset
if (USR & (1<<FE)) {
if (UDR == 0)
rx_chan = 0;
// Our 8 channels?
} else if ((rx_chan & 0x1F8) == my_base) {
chan[(rx_chan++ & 0x07)] = UDR;
} else {
uint8_t tmp = UDR;
}
}
int main(void)
{
/* PortB as outputs */
DDRB = 0xFF;
PORTB = 0x00;
/* Uart-Init: 250kBaud, 8n2, receive only */
UBRR = 0x01;
UCR = (1<<RXCIE) | (1<<RXEN) | (1<<CHR9);
/* Timer Init: F_OSC/8, overflow & compare Int */
TCCR1A = 0x00;
TCCR1B = (1<<CS11);
TIMSK = (1<<TOIE1) | (1<<OCIE1A);
TCNT1 = TIMER1_RELOAD;
/* Enable Interrupts */
sei();
while (1);
return 0;
}
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