Re: [Simulavr-devel] How to read/write IO registers

[Marek Pietrzak]

Actually your commands worked for me and ATMega16:

... my simple program

#include <avr/io.h>

int main(void)
{
    UCSRB = 1<<RXCIE;
    for(;;);
    return 0;
}

... debugging with simulavr

Program received signal SIGINT, Interrupt.
main () at test.c:6
6        for(;;);
(gdb) x/xb 0x2A
0x80002a:    0x80
(gdb) set {char}0x2A=0x81
(gdb) x/xb 0x2A
0x80002a:    0x81
(gdb)

What do you get?

Regards, Marek

On 09/05/2012 12:55 PM, Andrey Vasilyev wrote:
> Hello, all!
>
>   Could you please help me to understand how to read/write from/to IO registers 
> using avr-gdb and simulavr? I mean when run something like:
>
>   ldi r17, (1<<RXCIE)
>   out UCSRB, r17
>
>   How can I see what has been written to UCSRB IO register? And how can I 
> change that value?
>
>   Something like:
>
>   x/4xb 0x2a
>   or
>   set {int}0x2a=0x80
>
>   Doesn't work.
>
>   I've been looking for this thing long time now...
>
>   Thank you,
>   Andrey.
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