Re: [avr-gcc-list] 163 avr-gcc program problem - resend

[sue and clay wispell]

hi gines,

thanks for the suggestion. i have tried all the compiler options with no 
luck. i am looking through the assembly listing (avr-objdump -S) and 
nothing is jumping out. the main differences i see are that _real_init_ 
is loading the Z register (r30) with a different value (presumably for 
the copy_data_loop) and immediately after main() is called the stack 
pointer is set to different values. neither value is RAMEND (0x45f). any 
ideas.

thanks in advance,

clay


Gines Martinez (Terra) wrote:

> Try to remove the compiler option -O2.
>
>
> ----- Original Message ----- 
> From: "h c wispell ii" <address@hidden>
> To: "avr-gcc-list" <address@hidden>
> Sent: Friday, May 17, 2002 8:41 AM
> Subject: [avr-gcc-list] 163 avr-gcc program problem - resend
>
>
>  
>
> > hi all,
> >
> > i am having trouble with a simple program running on an atmega163 that 
> > echoes any character received on the serial port. the problem is that if 
> > the rx/tx portion appears in a separate function, the 163 resets after a 
> > few (it varies from 1 to about 15) characters. it works fine if the 
> > rx/tx is inline. i am using avr-gcc 3.0.4, binutils-020423 and 
> > libc-20020203 on a linux system. the program is compiled with options 
> > "-std=gnu99 -Wall -O2 -mmcu=atmega163". to see the problem uncomment 
> > cmd() and comment out the inline rx/tx.various combinations of  
> > compilation options didn't help. any ideas?
> >
> >
> > thanks in advance for any help.
> >
> >
> > clay
> >
> >
> > #include <io.h>
> > #include <string.h>
> > #include <sig-avr.h>
> > #include <wdt.h>
> > #include <interrupt.h>
> >
> >
> > void avr_setup()
> > {
> > // disable the UART
> > outp(0x00, UCSRB);
> > outp(0x00, UCSRA);
> >
> > // load the baudrate divisor register; 115200 at 9.216M
> > outp(4, UBRR);
> > outp(0, UBRRH);
> >
> > // enable the UART0 transmitter & receiver
> > outp(BV(TXEN) + BV(RXEN), UCSRB);
> >
> > // kill watch dog timer
> > wdt_disable();
> >
> > // setup d:7 for led
> > outp(0x00,PORTD);
> > outp(0x80,DDRD);
> >
> > // disable interrupts
> > cli();
> >
> > }
> >
> >
> >
> > void cmd(void);
> >
> >
> > int main(void)
> > {
> > unsigned int i,j;
> > char *buffer = "avr reset!\n\r";
> >
> > avr_setup();
> >
> >
> > // send reset message
> > for(i=0;i<strlen(buffer);i++)
> > {
> > outp(buffer[i],UDR);
> > loop_until_bit_is_set(UCSRA,TXC);
> > sbi(UCSRA,TXC);
> > }
> >
> >
> > // cheesy led blink
> > outp(0x80,PORTD);
> > for(i=0;i<40000;i++)
> > j=i+1;
> > outp(0x00,PORTD);
> >
> >
> > // main loop
> > while(1)
> > {
> > //if(bit_is_set(UCSRA,RXC)) outp(inp(UDR),UDR); // read in character
> > cmd();
> > }
> >
> >
> > return 0;         
> > }
> >
> >
> >
> >
> > void cmd(void)
> > {
> > if(bit_is_set(UCSRA,RXC)) outp(inp(UDR),UDR); // read in character
> > }
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > avr-gcc-list at http://avr1.org
> >    
>
> avr-gcc-list at http://avr1.org
>
> .
>
>  


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