Is it device memory? You probably need     ThreadCtl(_NTO_TCTL_IO,0);
and mmap_device_io, ask on bsp forum.

Hannes Bock wrote:
>
> hi,
>
> i have a problem with reading/writing from/to the CPLD registers:
> my code looks like this:
>
> #include <stdlib.h>
> #include <stdio.h>
> #include <arm/inout.h>
>
> typedef unsigned short uint16;
> const uint16* BSTAT1 = (uint16*) 0xb4000014;
>
> int main(int argc, char *argv[]) {
>         uint16 reg = in16( 0xb4000014);
>         printf("0x%04x\n", reg);
>         return EXIT_SUCCESS;
> }
>
> while running i gdb terminated with:
> <terminated>cpld_test [C/C++ QNX QConn (IP)]   
>         <terminated>QNX GDB Debugger (16.05.08 14:08)  
>         <terminated, exit value: 1>/tmp/cpld_test_ ... on mx31_ pid 
> 110600
>         <terminated, exit value: 
> 0>C:\QNX632\host\win32\x86\usr\bin\ntoarm-gdb.exe
>
> i tried to include the QNXBSP/src/hardware/devg/imx31/imx31.h, too. 
> (i'm using an freescale i.mx31 board) But that doesn't help.
>
> maybe there is a memory mapping? but how i get the mapped addresses?
> or am i in principle wrong?
>
> _______________________________________________
> General
> http://community.qnx.com/sf/go/post8181
>