[ts-7000] Problem with DIO header of TS 7800

["charliewxj" <>]

Hello, I just started using TS 7800 board. I just want to use DIO header to 
create a square wave. I tried to write a C code but it didn't succeed. I need 
help from all of you.

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>

int main(void)
{

        char input;
        int fd;
        unsigned long *ptr;
        unsigned long *dr;

        printf("begin, square wave.\n");

        fd= open("/dev/mem",O_RDWR) ;  

        ptr = 
mmap(NULL,getpagesize(),PROT_READ|PROT_WRITE,MAP_SHARED,fd,0xe8000000);

        dr =ptr + 0x4;  // 0x4 offset
        *dr=*dr & 0x0000;
        while(1)
        {
                usleep(1000000);
                *dr= ~ *dr;
        }

        return 0;
}






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