RE: [avr-libc-dev] Question on stack size in ATmega128 and Errors in iom128.h

[E. Weddington]

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On
> Behalf Of Curtis, Ron Sent: 9. december 2002 19:01 To:
> 'address@hidden' Subject: [avr-libc-dev] Question on stack
> size in ATmega128 and Errors iniom128.h
> 
> Hi-
> 
>    Question on ATmega128:  
> Why is the stack initialized to 0x10FF instead of 0x0FFF?

I believe I saw an answer to your post about this in the AVRFreaks 
GCC forum.

 
> Also,  I had to make the following corrections to iom128.h  to be
> consistent in my code.
> 
> /* USART Status Register A   ERROR RDC
> #define    RXC          7
> #define    TXC          6
> #define    UDRE         5
> #define    FE           4
> #define    OVR          3    This definition differs from the databook
> #*/
>   /*definition to avoid problems with the OR instruction */
> 
> /* UCSR0A    correction, RDC  12/2/02*/
> #define RXC0  7
> #define TXC0  6
> #define UDRE0 5
> #define FE0   4
> #define OVR0  3
> #define U2X0  1
> #define MPCM0 0
> 

Your correction is incorrect depending upon which version of the 
software you're using. The latest from CVS is correct with the 
ATmega128 data sheet from Atmel:
http://www.atmel.com/atmel/acrobat/doc2467.pdf

So if you have a later distribution of the software, you might want 
to update your project rather than change the header file that comes 
with the distribution.

Eric