stm32 rand() problem

lucabe90 · ‎2012-08-24

Posted on August 24, 2012 at 16:23

hi

i have a problem with the stm32w mb851a

i would generate a random number. i have try to use the function rand() and I include header file

but when i execute the program it jump at

void __attribute__ ((weak)) Default_Handler()

{

/* Hang here */

while(1)

{

}

why?

this is my include files

#include PLATFORM_HEADER

#include BOARD_HEADER

#include ''hal/hal.h''

#include ''hal/micro/cortexm3/uart.h''

#include ''hal/micro/micro-common.h''

#include ''hal/micro/cortexm3/micro-common.h''

#include ''include/phy-library.h''

#include ''hal/error.h''

#include <stdio.h>

#include <stdlib.h>

#include ''hal/micro/temperature_sensor.h''

#include <time.h>

#include <math.h>

...

int main()

{

int a=0;

.....

a=rand();

....

}

Tesla DeLorean · ‎2012-08-24

Posted on August 24, 2012 at 17:43

With WHAT compiler/toolchain?

Most likely cause of a Hard Fault is that you have linked a library with ARM 32-bit code, which doesn't run on the Cortex-M3

Use your debugger to look at the faulting instruction, and perhaps use a fault handler that can decode the condition, rather than a while(1) loop. Joseph Yiu has published a book, and web examples of such.

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lucabe90 · ‎2012-08-24

Posted on August 24, 2012 at 19:58

thanks for the answer

i use atollic 3.0.

when i use a debugger i can't see the exectly point when the code jump in the default heandler because when i try to step into the function the execution jump in the default heandler. i search on internet and i think the problem could be that i haven't link the stdlib with the compiler but i haven't idea to resolve that. how can do?

thanks

Luca

Andrew Neil · ‎2012-08-24

Posted on August 24, 2012 at 20:12

''i would generate a random number''

Remember that rand() does not generate true random numbers - just pseudo-random...

Andrew Neil · ‎2012-08-24

Posted on August 24, 2012 at 20:14

Stupid forum insists on hiding text as ''quoted message''

''i would generate a random number''

Remember that rand() does not generate true random numbers - just pseudo-random...

lucabe90 · ‎2012-08-24

Posted on August 24, 2012 at 20:27

yes i need a pseudo-random number

thanks for the detail

alaa_06 · ‎2013-02-08

Posted on February 09, 2013 at 03:52

what this problem ???

http://www.hostingpics.net/viewer.php?id=863791Sanstitre.png

Tesla DeLorean · ‎2013-02-08

Posted on February 09, 2013 at 04:00

what this problem ???

It appears unrelated to this thread. That BOARD_HEADER isn't resolving to a quoted file name in the preprocessor?

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