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===Demo-Code===
Den folgenden C-Code einfach unter '''demo.c''' speichern und die folgende Makefile einfach unter '''Makefile'''. Und dann könnt ihr mit '''make''' das demo-Programm für den AVR erzeugen. Falls '''make''' mit einer Fehlermeldung ala ''***missing seperator (did you mean TAB instaed of 8 spaces?)'' abbricht, könnt ihr mit '''<pre>sed s/"        "/\\t/g Makefile > makefile</pre>''' das Problem beheben (zwischen den Anführungszeichen müssen entsprechend der Fehlermedung viele Leerzeichen sein). 
====C-Code====
<pre class="code">
//demo.c
//This is a simple Demo for the Labor Board.
//It displays 2 different light patterns on the LEDs,
//and allows the pattern to be selected, and the speed to be controled
//with the 4 keys.


#include <inttypes.h>
#include <avr/io.h>


int main (void)
{
DDRB = 0; //Port B all inputs
PORTB = 0x0F; //Internal Pullups on on key inputs
DDRC = 0xFF; //Port C all outputs
PORTC = 0x01;  //1 LED on to start of Patterns
int x, delay=10000; char mode=0, ud=0;
for ( ;; ){ //for ever
//this is a time delay loop
for(x=0; x< delay; x++){
//The volatile qualifier tells the compiler not to optimize
//it away.
volatile int y = 0;
};
if(!mode){
//knight rider mode
switch (ud){
case 0: //shift light left
if( (PORTC<<=1) == 0x80 ){ //until bit7 is reached
ud = 1;
};
break;
case 1: //shift bit right
if( (PORTC>>=1) == 0x01 ){ //until bit0 is reached
ud = 0;
};
break;
};
}else{
//scroll mode
switch (ud){
case 0:
PORTC|=(PORTC<<1);//shift additional ones in from left
if(PORTC & 0x80)  //until bit7 is reached
ud = 1;
break;
case 1:
PORTC<<=1; //shift zeros in
if (PORTC == 0){//until all zeros
ud = 0;
PORTC = 0x01;//start over
}
break;
};
}
switch(PINB&0x0f){
case 0x0E: //Button 1 pressed
if (delay<30000){
delay += 100;
}
break;
case 0x0D: //Button 2 pressed
if (delay>1000){
delay -= 100;
}
break;
case 0x0B: //Button 3 pressed
mode = 0;
break;
case 0x07: //Button 4 pressed
mode = 1;
break;
};
};
}
</pre>
====Makefile====
<pre class="code">
PRG            = demo
OBJ            = demo.o
MCU_TARGET    = atmega32
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
all: $(PRG).elf lst text eeprom
$(PRG).elf: $(OBJ)
        $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
clean:
rm -rf *.o $(PRG).elf *.eps *.png *.pdf *.bak
rm -rf *.lst *.map $(EXTRA_CLEAN_FILES)
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 $< $@
# Every thing below here is used by avr-libc's build system and can be ignored
# by the casual user.
FIG2DEV                = fig2dev
EXTRA_CLEAN_FILES      = *.hex *.bin *.srec
dox: eps png pdf
eps: $(PRG).eps
png: $(PRG).png
pdf: $(PRG).pdf
%.eps: %.fig
$(FIG2DEV) -L eps $< $@
%.pdf: %.fig
$(FIG2DEV) -L pdf $< $@
%.png: %.fig
$(FIG2DEV) -L png $< $@
</pre>




Version vom 19. Juni 2005, 15:34 Uhr

Abgerufen von „https://wiki.das-labor.org/index.php?title=Laborboard&oldid=468“