Avr-gcc
How to setup avr-gcc and get compiling for an Arduino!
<pre> $ yum install avr-gcc avr-libc avr-binutils avrdude </pre>
See: using the Arduino IDE
<h2>avrdude</h2> use avrdude to load files into the arduino
<h2>makefile</h2>
<h3>devices</h3>
- <code>atmega168</code>
- <code>atmega328p</code>
<h3>simple</h3> Just produces the .elf and .hex file. Also optimizes for space (HUGE difference) <pre> all:
avr-gcc avr.c -mmcu=atmega328p -o example.elf -Wall -Os avr-objcopy -j .text -O ihex example.elf example.hex avrdude -c buspirate -P /dev/ttyUSB1 -p m328p -U flash:w:example.hex
</pre>
<h3>complex</h3> produces .o, .asm, .map and .lst files too <pre> all:
avr-gcc -g -mmcu=atmega328p -c avr.c -Wa,-alh,-L -o example.o > example.asm avr-gcc -g -mmcu=atmega328p -Wl,-Map,example.map -o example.elf example.o avr-objdump -h -S example.elf > example.lst avr-objcopy -j .text -j .data -O ihex example.elf example.hex avrdude -c buspirate -P /dev/ttyUSB1 -p m328p -U flash:w:example.hex
</pre>
<h2>sample source</h2>
<h3>blink</h3> <source lang="c"> /* 8 Mhz cpu */
- define F_CPU 8000000UL
/* led pin */
- define LED 0b00100000
- include <util/delay.h>
- include <avr/io.h>
int main(void) {
/* set port b direction register to output for led pin */ DDRB = LED;
while(1) {
/* turn led off */ PORTB &= ~LED; _delay_ms(450);
/* turn led on */ PORTB |= LED; _delay_ms(50); }
} </source>
<h3>S.O.S.</h3> <source lang="c"> /* 8 Mhz cpu */
- define F_CPU 8000000UL
/* led pin */
- define LED 0b00100000
- include <util/delay.h>
- include <avr/io.h>
void dot(void) {
/* turn led on */ PORTB |= LED; _delay_ms(200);
/* turn led off */ PORTB &= ~LED; _delay_ms(500);
}
void dash(void) {
/* turn led on */ PORTB |= LED; _delay_ms(700);
/* turn led off */ PORTB &= ~LED; _delay_ms(500);
}
int main(void) {
char i;
/* set port b direction register to output for led pin */ DDRB = LED;
while(1) {
for (i=0;i<3;i++) { dot(); } for (i=0;i<3;i++) { dash(); } for (i=0;i<3;i++) { dot(); }
_delay_ms(5000);
}
} </source>
<h2>other commands</h2>
<pre> avr-size example.elf avr-gcc --help=optimizers </pre>
<h2>resources</h2> https://www.mainframe.cx/~ckuethe/avr-c-tutorial/<br> http://arduino.cc/en/Hacking/PinMapping168<br> http://hintshop.ludvig.co.nz/show/buspirate-avr-programming/<br> http://itp.nyu.edu/physcomp/uploads/6pinAVRproghead.jpg<br> http://dangerousprototypes.com/bus-pirate-manual/<br> http://www.ladyada.net/library/arduino/bootloader.html