[avr-chat] AVR Test

[Chris Spencer]

I was able to get my dev environment setup (thanks Galen) and 
successfully write a hex file to my atmega48. However, my test program 
doesn't make the led blink. Below is my c code and makefile. Does anyone 
see any glaring problems? Is my makefile setting (or not setting) the 
appropriate fuse bits? I'm testing on two Pololu Baby Orangutan boards 
(http://www.pololu.com/products/pololu/0215/), so I'm pretty confident 
it's not a hardware issue. All lights are green on the programmer.

#include <avr/io.h>

/* at 8 MHz we get 1us per 8 instructions */
inline void delayus() { asm volatile("nop\nnop\nnop\nnop\n"
                                       "nop\nnop\nnop\nnop"); }

void delayms(uint16_t millis) {
   uint16_t loop;
   while ( millis ) {
   loop = 100;
   while (loop) {
       /* 20us of delays */
       delayus(); delayus(); delayus(); delayus(); delayus();
       delayus(); delayus(); delayus(); delayus(); delayus();
       loop--;
   }
   millis--;
   }
}

int main(void) {
   DDRD |= 1<<PD1; /* set PD1 to output */
   while(1) {
   PORTD |= 1<<PD1; /* LED on */
   delayms(1000);
   PORTD &= !(1<<PD1); /* LED off */
   delayms(1000);
   }
   return 0;
}

CC=avr-gcc
CFLAGS=-g -Os -Wall -mcall-prologues -mmcu=atmega48
OBJ2HEX=avr-objcopy
TARGET=blink
PART=m48
PROGRAMMER=avrisp2

program: $(TARGET).hex
   avrdude -p $(PART) -c $(PROGRAMMER) -P usb -e flash:w:$(TARGET).hex

%.obj: %.o
   $(CC) $(CFLAGS) $< -o $@

%.hex: %.obj
   $(OBJ2HEX) -R .eeprom -O ihex $< $@

clean:
   rm -f *.hex *.obj *.o