EINT pins in GPIO connector.
Sandeep G.R
grsandeep85 at gmail.com
Thu Dec 10 02:06:00 EST 2009
Hi,
I am using S3C2440+7" touchscreen, i need to toggle(0 or 1) the EINT
pins in the GPIO connector ( say GPIO11 & GPIO12) and i have made an program
to toggle the pins but i run my program the pins will be always high(1) by
default and if i change the programs to GPIO connector (say GPIO29, 30, 31,
32 which has been connected to led's in the board) it will toggle and work
fine, Below is my program
*#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#define MAP_SIZE 4096UL /* the size of one page of virtual memory */
#define MAP_MASK (MAP_SIZE - 1) /* mask used for the one page of virtual
memory */
#define GPIOG_CON 0x56000060 /* physical address of the GPIO G control
register */
#define GPIOG_DAT 0x56000064 /* physical address of the GPIO G data
register */
int main(int argc, char **argv) {
int fd,count;
void *map_base, *virt_addr;
unsigned long read_result, writeval;
if(argc < 2) {
fprintf(stderr, "\nUsage:\t%s { seconds }\n"
"\tseconds : number of seconds to blink\n\n",
argv[0]);
exit(1);
}
count = strtoul(argv[1], 0, 0);
/* open the memory device file descriptor */
if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1)
return -1;
/* Map one page */
map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
GPIOG_CON & ~MAP_MASK);
if(map_base == (void *) -1)
return -1;
/* set the virtual memory address to the GPIO G control register */
virt_addr = map_base + (GPIOG_CON & MAP_MASK);
/* read the current value for GPIO G control register */
read_result = *((unsigned long *) virt_addr);
writeval = read_result;
// writeval &= ~0x03; /* mask off the first two bits */
writeval |= 0x1400; /* set gpio G5 and G6 to output with value of
0x01 (output)*/
printf("writing data finished\n");
*((unsigned long *) virt_addr) = writeval;
/* change virtual memory address to GPIO G data register */
virt_addr = map_base + (GPIOG_DAT & MAP_MASK);
for ( count ; count > 0 ; count--) {
printf("count=%d\n",count);
/* read the current value for GPIO G data register */
read_result = *((unsigned long *) virt_addr);
writeval = read_result;
if ( (read_result&(1<<5)) )
{ writeval &= ~(1<<5);
writeval |=(1<<6);
}else
{
writeval &= ~(1<<6);
writeval |= (1<<5);
}
*((unsigned long *) virt_addr) = writeval;
sleep(1);
}
/* read the current value for GPIO G control register */
read_result = *((unsigned long *) virt_addr);
writeval = read_result;
writeval |= (1<<0);
*((unsigned long *) virt_addr) = writeval;
/* unmap the virtual memory before exiting the program */
if(munmap(map_base, MAP_SIZE) == -1)
return -1;
close(fd);
return 0;
}*
How to toggle the EINT pins in the GPIO connector any suggestions would be
advantage.
Thanks & Regards,
SANDEEP G R,
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