BeagleBoneBlack Push Button + LED

BeagleBoneBlack_PushButton_LED.C

#include<stdio.h>
#include<unistd.h>

void Read(char *switch_value, char *val);
void Write(char *switch_value, char *val);
void Blink(char *led_value, int delay);

int main()
{
	char *led_direction="/sys/class/gpio/gpio23/direction";
	char *switch_direction="/sys/class/gpio/gpio26/direction";

	char *led_value="/sys/class/gpio/gpio23/value";
	char *switch_value="/sys/class/gpio/gpio26/value";

	char *cmd_out="out";
	char *cmd_in="in";

	char *export="/sys/class/gpio/export";
	char *unexport="/sys/class/gpio/unexport";

	char val[10];

	Write(export,"23");
	Write(export,"26");

	Write(led_direction,cmd_out);
	Write(switch_direction,cmd_in);

	while(1)
	{
		Read(switch_value,val);
		printf("%s\033[F\033[J",val);

		if(!strcmp(val,"1\n"))
			Blink(led_value,100000);
		else
			Write(led_value,"0");

		usleep(100000);
	}
}


void Read(char *url, char *val)
{
	FILE *path=fopen(url,"r");
        fread(val,2,1,path);
	fclose(path);
}

void Write(char *url, char *val)
{
	FILE *path=fopen(url,"w");
	fwrite(val,1,sizeof(val),path);
	fclose(path);
}

void Blink(char *led_value, int delay)
{
	int i;
	for(i=0;i<10;i++){
		Write(led_value,"1");
		usleep(delay);
		Write(led_value,"0");
		usleep(delay);
	}
}