[avr-gcc-list] Re: first C program for an AVR2313

[Bill Knight]

Patrick
  Congratulations!!
Since you asked and I want to know too, I have understood from postings
that the use of -O3 is dangerous with avr-gcc.  Apparently it can frequently
cause the generation of incorrect code.  maybe others on this list can
enlighten us both.
Regards
-Bill Knight
R O SoftWare


On Thu, 8 Nov 2001 09:00:30 -0500 (EST), Patrick Lanphier wrote:

>Below is my first C program for an AVR2313 chip.  I don't undersand why
>when I incude the "SIGNAL" function things don't function at all.  Thanks
>everyone for your help.  Any general pointers would be great also.
>
>============================================================
>
>/*
>First C Program for the AVR-2313 Chip
>
>avr-gcc -O3 -mmcu=at90s2313 -c main.c -o main.elf
>avr-objcopy -S -O ihex main.elf main.hex
>*/
>
>#include <eeprom.h>
>#include <interrupt.h>
>#include <timer.h>
>#include <wdt.h>
>#include <math.h>
>#include <pgmspace.h>
>#include <stdlib.h>
>#include <errno.h>
>#include <io.h>
>#include <interrupt.h>
>#include <sig-avr.h>
>
>unsigned int led;
>SIGNAL(SIG_OVERFLOW0) {
>  outp(0x1, PORTB);
>  led = ~led;
>  outp(led, PORTB);
>  outp(0, TCNT0);
>}
>
>int main(void) {
>  led = 0xFF;
>  outp(0xFF,DDRB);            // use all pins on PortB for output
>  outp(led, PORTB);
>  outp(0x1, PORTB);
>  outp(TOIE0, TIMSK);         // enable TCNT0 overflow
>  outp(TOV0, TIFR);           // TOV0: Timer/Counter0 Overflow Flag
>  outp(0,TCNT0);              // reset TCNT0
>  outp(CS02 && CS00,TCCR0);   //
>  sei();                      // enable interrupts
>  while(1);
>}
>============================================================
>
>Patrick Lanphier
>The Artemis Group
>http://www.artemisgroup.com
>phone: 814-235-0444
>  fax: 800-582-9710
>
>
>
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