LED code error

[sandeepgr]

Hi ,
I executed the LED getting started code from atmel in the target board but it
was giving the following error:

root@at91sam9263ek:/var/volatile/tmp$
./getting-started-project-at91sam9260-ek-at91sam9260-sdram.elf
Segmentation fault
root@at91sam9263ek:/var/volatile/tmp$

this code has been downloaded from
Atmel Products - Tools & Software
(AT91SAM9260-EK Software Package)

and code is below here

/******** LED PROGRAM ************/

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <strings.h>
#include <string.h>
#include <time.h>
#include "AT91SAM9260.h"

#define LED_MAX 2

static unsigned ledSignalMapping[] = { AT91C_PIO_PA5, AT91C_PIO_PA9};

#define GPIO_LED_MASK (AT91C_PIO_PA5 | AT91C_PIO_PA9)

//static int memMapFile;
static AT91PS_PIO at91cBasePIOA;

static void UpdateLED(unsigned ledIndex, unsigned on)
{
if (ledIndex >= LED_MAX)

return ;
if (on)
{
at91cBasePIOA->PIO_CODR = (ledSignalMapping[ledIndex]);
}
else
{
at91cBasePIOA->PIO_SODR = (ledSignalMapping[ledIndex]);
}

}

static int OpenSystemController(void)
{
if ((memMapFile = open("/dev/mem", O_RDWR | O_SYNC)) < 0)
{
printf("ERROR: Unable to open /dev/mem\n");
return (errno);
}

at91cBasePIOA = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
MAP_SHARED, memMapFile, (unsigned)AT91C_BASE_PIOA);

if (at91cBasePIOA == MAP_FAILED)
{
printf("ERROR: Unable to mmap the system controller\n");
close (memMapFile);
memMapFile = -1;
return (errno);
}

at91cBasePIOA->PIO_CODR = GPIO_LED_MASK;
at91cBasePIOA->PIO_PPUDR = GPIO_LED_MASK;
at91cBasePIOA->PIO_PER = GPIO_LED_MASK;
at91cBasePIOA->PIO_OER = GPIO_LED_MASK;
return (0);
}

int main(int argc, char **argv)
{
unsigned ledIndex;

printf("Hello\n");
if (OpenSystemController())
{
printf("Unable to map hardware resources\n");
return (-1);
}

ledIndex = 0;
while (1)
{
UpdateLED(ledIndex, 1);
printf ("LED %d is now on\n", ledIndex);
usleep(500000);
UpdateLED(ledIndex, 0);
printf ("LED %d is now off\n", ledIndex);
usleep(500000);
if (++ledIndex >= LED_MAX)
ledIndex = 0;
}

return (0);
}

please help this issue.

[wje_lf]

Since not even the printf() at the beginning of main() seems to be working, this makes no sense at all. I have two suggestions.

1. Run this program under gdb, stepping through each source code line to see how far you really get and where it blows up.
2. If that doesn't help you at all, go to the amtel site's discussion forums and ask your question there.