[microblaze-uclinux] Program able to write on LEDs successfully

["Kunal Kishore" <kunalpatna@xxxxxxxxx>]

Hello everybody,
My struggle to write on LEDs has come to an end. Now I dont think there
is a need to write any separate device driver for GPIO as a xilinx gpio
driver already exists. An issue I was missing on was setting the I/O
direction for the pins. '0' configures the pins as output and '1' as
output. I am giving "myapp.c" .

myapp.c:

#include "stdio.h"
#include "xgpio_l.h"

#define LED_BaseAddress 0x40020000

int main (void) 
{    
    unsigned int j;
    void Write_on_LEDs(int, int);
    printf("-- Application Program By KUNAL to Write on LEDs  --\r\n");
    printf("Size of int on this platform = %d Bytes\n",sizeof(int));    /* Checking "int" size */
    printf("Enter 8 Bit Hex Data to Write on 8 LEDs :\n");     
      scanf("%x",&j);
    printf("Press CTRL C to exit\n");
      while(1) 
    {
           Write_on_LEDs(LED_BaseAddress,j);
    };
       return 0;     
    
}

void Write_on_LEDs(int BaseAddress,int j)
{
     
       XGpio_mSetDataDirection(BaseAddress, 1, 0x00000000);   /* Set as Output */
    
    XGpio_mSetDataReg(BaseAddress, 1, j);    /* Write on LEDs */
  
}