I@R @VR problem with a code

Hi
when I make a project with below code with I@R @VR c0mpiler (cpu:at90s8515) and debug it with $py ,I see that the program exit the while loop !!! without any reason.if I change sprintf to printf ,there is no problem.

Is this my problem or is c0mpiler problem?



#include "stdio.h"
void main(void)
{
unsigned int kkk;
char bufff[6];

bufff[5] = 0;

while(1){
kkk = 1234;
sprintf (bufff,"%u", kkk);
}
}

Hi,

did you try to change the while-loop into a for-loop?
I remember i had a similar problem and with a for-loop the problem was solved.

regards

it could be the case your string is not enough to hold entire output forvalue of kkk . As your string buff is defined as stack variable , when output is done sprintf could overide the stack and lead to corruption , then behaviour is undefined .
Incrcease buff size up to 20 let say and try again .

In IAR C-SPY 2.28a, uC set is ATmega128, all works fine....

Hi,

You may need to implement the printf function, or 'stub' it
out, e.g. this is the prontf function that I use, I make a back-up and
modify the existing 'printf.c' file which is in one of
the IAR directories (INC I think):


static void put_one_char(char c, void *dummy)
{
tx_byte(PRINT_PORT,c);
/* or comment the above line out if you are using c-spy */
} /* Warning on this line OK (unused 'dummy') */


int printf (const char *format, ...) /* Our main entry */
{
va_list ap;
int nr_of_chars;

va_start (ap, format); /* Variable argument begin */
nr_of_chars = _formatted_write (format, put_one_char, (void *) 0, ap);
va_end (ap); /* Variable argument end */
return (nr_of_chars); /* According to ANSI */
}