S12 / MagniV Microcontrollersのトピックabout printf and sprintf

about printf and sprintf

goodluck — Tue, 12 Mar 2013 11:19:40 GMT

I use mc9s12xdp512 kit.

my code uses many sprintf and printf.

method I use is add termoi.c and stdio.h

but my main code is not work.

My kit to communicate with other kit.but It will stop with the error and display illegal bp.

I think that it is caused by sprintf. The reason is when I remove the sprintf, since it works well.

what is the problem? help me

RadekS — Tue, 19 Mar 2013 16:29:22 GMT

termio.c contains general code which has to be updated for your application (TERMIO_Init function, baud rate according your bus clock).

illegal bp means that debugger detects some unexpected behavior like unexpected interrupt or reset.

Here you can find example code for Interrupt catcher (catch unexpected interrupts):

Here is most simple example code for sprintf function and SCI module (without termio.c):

#include <stdio.h>

void main(void) {

unsigned int i;

char text[30]; // must be longer than string

char result = 0x42;

SCI0BD = 0x0034; // SCI baud rate = SCI bus clock / (16 * SCIBR[12:0]) = 8MHz/(16*9600)= 0x34

SCI0CR2 = 0x08; // transmitter enable

(void)sprintf(text,"Hello World, answer is : %X \n\r",result);

i=0;

while(text[i]!='\0')

{

while(!SCI0SR1_TC);

SCI0DRL=text[i++];

}

for(;;) {} /* loop forever */

}

I hope that help you.

CompilerGuru — Thu, 21 Mar 2013 17:42:25 GMT

Could also be a stack overflow, as (s)printf needs quite a bit of stack space.

Also, as the OP guesses sprintf might be the issue (which is not using termio at all), the usual printf issues might be causing it too.

- non matching arguments to the format

- sprintf (as it is defined by ANSI) does not support to check for destination buffer overflows

- stack space overflows

Also, wondering if in this statement

> The reason is when I remove the sprintf, since it works well.

calls to sprintf only were removed while keeping printf calls, or were both sprintf and printf calls removed?

printf is the only one using termio, so if the issue is with sprintf only, then termio is out of the picture.

I did once post a trivial snprintf version here, but I don't see it attached in this thread

Daniel