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Re: [avr-gcc-list] Newbie - should this work?

From: Volkmar Dierkes
Subject: Re: [avr-gcc-list] Newbie - should this work?
Date: Fri, 17 Jan 2003 15:04:22 +0100


Josh Thompson <address@hidden> schrieb am 17.01.03 14:41:47:

> I'm new at using working with embedded systems.  I am fairly familiar
> with using gcc under Linux.  I am using an ATmega128, avr-gcc, and usip
> with a ByteBlaster programmer.  uisp says it detects the chip and then
> loads the code into flash.  I can dump the code and get the same thing
> that I uploaded; so, I think this part is working okay.  Here is my code:
> main.c:-------------------------
> #include <io.h>
> int main() {
>    DDRD = 0xff;
>    PORTD = 0X00;
> }
> -------------------------------

You need always an endless loop in your embeded system. Otherwise the mcu is 
running through its non used flash memory and you didn't know whats happen. 
Therefore change it to this:
int main() {
   DDRD = 0xff;
   PORTD = 0X00;

In this case you should geht your port D with <0.5V

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