Hi
i am working with this code(button sample) but only responds with pins DIO nº1,3,5,7 when they are shorted to earth by pin DIO nº2. Why 9,11,13,15 does not work?
#include<unistd.h>
#include<sys/types.h>
#include<sys/mman.h>
#include<stdio.h>
#include<fcntl.h>
#include<string.h>
#define DIOBASE 0xE8000000
int main(int argc, char **argv)
{
volatile unsigned int *PBDR, *PBDDR, *GPIOBDB;
int i;
unsigned char state;
unsigned char *start;
int fd = open("/dev/mem", O_RDWR|O_SYNC);
start = mmap(0, getpagesize(), PROT_READ|PROT_WRITE, MAP_SHARED, fd,
DIOBASE);
PBDR = (unsigned int *)(start + 0x04); //port b
//starting address of DIO read, E8000000 + 4 = E80000004
PBDDR = (unsigned int *)(start + 0x14); //port b direction
GPIOBDB = (unsigned int *)(start + 0xC4); // debounce on port b
*PBDDR = 0xf0; //upper nibble output, lower nibble input
*GPIOBDB = 0x01; //enable debounce on bit 0
state = *PBDR; // read initial state
printf ("Press buttons on DIO inputs. Ctrl-C to Quit.\n");
int count = 0;
unsigned char oldstate = (unsigned char)0;
while (1) //(state & 0x01)
{
state = *PBDR; // remember bit 0 is pulled up with 4.7k ohm
if (oldstate != state)
{
printf ("State:%x\n", state);
oldstate = state;
}
usleep(1000);
count++;
}
printf ("\nDONE\n");
close(fd);
return 0;
}
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