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[avr-gcc-list] AtMega128 and Timers

From: Andreas Mahr
Subject: [avr-gcc-list] AtMega128 and Timers
Date: Sun, 09 Jun 2002 14:11:59 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020313

Hi All!

I've got a Problem with my Mega 128 Device.

Some time ago I wrote a set of functions for millisecond, so far on all Devices I tested it, it worked. But now it dose not work any more and I can't see why. Here is a little Code:

volatile uint_32 milliseconds;
volatile uint_32 tick;


inline void timer0_init(void)
 milliseconds = 0;
 ASSR = 0x00;
 TCCR0 = _BV(CS2);

void delay_ms(uint_32 del)
 tick = milliseconds + del;
 while (milliseconds <= tick);

As You can see I use Timer 0 for a millisecond trigger Intervall.

This was compiled with:
gcc version 3.1
binutils version 020530 20020529
avr-libc version 20020531

For me it looks like the ISR was never Triggered, even if all Interrups where enabled by sei(); in main Init Routine.

Is there any known Problem with the Timers on Mega128?? Or is there a Problem with the Interrupt Table in libc?

Also the Makros for Program Space PSTR() seem not to work the expected way.

For the older Compilers the following was almost the same:




the only difference was the location of the Data .text and .data.

But whith the new compiler neither work!

Thanks for Your Help

A. Mahr

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