I am having troubles using the GPIO port on a SA1100. Included is a snippet
of code that tries to set the GPIO port to output, then set everything high,
followed by low. This simple little test is throwing a segmentation fault
every time I try to write to the registers.
Thanks in advance for any input,
Sisinio
#include <stdio.h>
#define GPIO_GPLR 0x90040000
#define GPIO_GPDR 0x90040004
#define GPIO_GPSR 0x90040008
#define GPIO_GPCR 0x9004000C
#define GPIO_GRER 0x90040010
#define GPIO_GFER 0x90040014
#define GPIO_GEDR 0x90040018
#define GPIO_GAFR 0x9004001C
typedef unsigned long ULONG;
int main( int argc, char* argv[] )
{
ULONG* ptr;
// set to output
fprintf( stdout, "setting GPDR\n" );
ptr = (ULONG*)GPIO_GPDR;
*ptr = 0xFFFF;
// set high
fprintf( stdout, "set to 1s\n" );
ptr = (ULONG*)GPIO_GPSR;
*ptr = 0xFFFF;
// sleep
for ( int i = 0 ; i < 10000000 ; ++i );
// set low
fprintf( stdout, "set to 0s\n" );
ptr = (ULONG*)GPIO_GPCR;
*ptr = 0xFFFF;
return 0;
}
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