buffer initialization

Posted by fv78

on Feb 01 2007 01:20 AM

Hi,
I can't seem to make the piece of code below running.
The user LED on the EVLM3S811 never lights on!
What am I doing wrong ?
The problem is located in the for loop which seems to
work if I decrease the buffer's size to say 200.

thanks in advance for your help

PS: memset(buf, 'A', sizeof(buf)) doesn't work either.

#include "hw_types.h"
#include "hw_memmap.h"
#include "sysctl.h"
#include "gpio.h"

int main(void)
{
int buf[512];
int i;

// Set the clocking to run at 20MHz from the PLL
SysCtlClockSet(SYSCTL_SYSDIV_10 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_6MHZ);

// Enable the peripherals used by the application
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
// Configure LED, push button
GPIODirModeSet(GPIO_PORTC_BASE, GPIO_PIN_5, GPIO_DIR_MODE_OUT);
GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_5, 0);

for(i=0; i<310; i++)="" buf[i]="">
i = buf[0]; // to avoid warning in this example
GPIOPinWrite(GPIO_PORTC_BASE, GPIO_PIN_5, GPIO_PIN_5);

while(1);

}

Post edited by: fv78, at: 2007/02/01 01:22

Posted by orinem

on Feb 01 2007 02:20 AM

Intellectual470 points

Your stack isn't big enough. It's defined in startup.s similar to the following:

Code:


 ;******************************************************************************
;
; <h> Stack Configuration
;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>
;
;******************************************************************************
Stack   EQU     0x00000100

You are going to have to increase your stack size by the size of your buffer.

Orin.

Posted by fv78

on Feb 01 2007 02:44 AM

Prodigy60 points

I am so stupid! I searched for that in the different keil's menus and didn't even thought of looking through
the different files of the project.

Thanks a lot for the quick (needed ;-) ) answer.