ledtest_app.c

Linux device driver sample code

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include "led_drv.h"

char str[20]="hello";

int main(void)
{
	int device_handle;
	int ledval;

	printf("\nLDD test \n");

	device_handle = open("/dev/LED", O_RDWR);
	
	read(device_handle, &str[0], 5);

	printf("\nstring %s\n", str);
	
	write(device_handle, "Howdy", 5);

	ledval = 0xFC0;
	ioctl(device_handle, LEDON_WDATA, ledval);
	sleep(1);
	ioctl(device_handle, LEDOFF_WDATA, ledval);

	ledval = 0x550;
	ioctl(device_handle, LEDON_WDATA, ledval);
	sleep(1);
	ioctl(device_handle, LEDOFF_WDATA, ledval);

	ledval = 0xAA0;
	ioctl(device_handle, LEDON_WDATA, ledval);
	sleep(1);
	ioctl(device_handle, LEDOFF_WDATA, ledval);

	close(device_handle);
}