at91_enthus wrote:
> Hi.
>
> I was testing Xenomai on my AT91SAM9G20-based board and tried to adapt the
> code found here:
> http://www.armadeus.com/wiki/index.php?title=Xenomai:Blinking_LEDs .
> The only difference between my code and theirs was the access to hardware. I
> used open("/dev/mem", ...) and mmap().
> The program compiles fine and both functions are executed. However, when I
> place values in PIO registers, I get Segmentation Fault.
>
> I tested my code without Xenomai and it does what it is suppose to do.
>
> Here's the configuration of my system:
> Processor: AT91SAM9G20
> Xenomai version: 2.5.5.2
> Kernel: 2.6.33-5
> GCC 4.3.2 (I compile the code on the board)
>
> ---------------- Code snippet -------------------
> unsigned char *pioa_base, *aic_base;
>
> void open_controller(){
>
>
> if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1)
> {
> ....
> }
> printf("/dev/mem opened.\n");
>
> /* mapping of PIOB */
> aic_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
> AT91C_BASE_PIOB & (~MAP_MASK));
> piob_base = aic_base + AT91C_BASE_PIOB - AT91C_BASE_AIC;
>
> if( (pioa_base == (void *) -1)) {
> ...
> }
Wrong test here. Should be "if (aic_base == MAP_FAILED)"
--
Gilles.
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