Re: [avr-gcc-list] Programming ATMega2560

[Andreas Höschler]

Hi Tom,

#define F_CPU 16000000UL  /* 16 MHz CPU clock */

#include <util/delay.h>

#define OUTPUTPORT PORTB

#define OUTPUTPIN PB7

int main (void)

  {

   DDRB = 0xff;          // all outputs

   while (1)                       /* loop forever */

     {

      if ((PORTB & _BV(PB7)) > 0) PORTB &= ~_BV(PB7);

      else PORTB |= _BV(PB7);

      delay_ms(500);

     }

      return (0);

  }

A couple coding problems.

You need to include avr/io.h to get port definitions.

I tried with and without. With I get 

-bash-3.2$ make

avr-gcc -mmcu=atmega2560 -Wall -O2 -I /usr/local/avr/include -I./ -o toggle_led.out main.c 

unknown MCU 'atmega2560' specified

Known MCU names:

   avr2

   at90s2313

...

   attiny15

   attiny28

main.c:1: error: MCU 'atmega2560' supported for assembler only

In file included from main.c:4:

/usr/local/avr/include/avr/io.h:530:6: warning: #warning "device type not defined"

main.c: In function 'toggleOutput':

main.c:19: error: 'PORTB' undeclared (first use in this function)

main.c:19: error: (Each undeclared identifier is reported only once

main.c:19: error: for each function it appears in.)

main.c:19: error: 'PB7' undeclared (first use in this function)

main.c: In function 'main':

main.c:34: error: 'DDRB' undeclared (first use in this function)

main.c:45: error: 'PORTB' undeclared (first use in this function)

main.c:45: error: 'PB7' undeclared (first use in this function)

make: *** [toggle_led.out] Error 1

:-(

Thanks,

 Andreas