Led_BBB_lenguaje_C/main.c

//This project turns on, off or toggle an LED
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define LED3_PATH "/sys/class/leds/beaglebone:green:usr3"
#define bled "/brightness"
#define tled "/trigger"
#define en "/delay_on"
#define ap "/delay_off"
//Protypes:
void writeLED(char fileName[], char value[]);
void removeTrigger();
//main:
////////////////////////////////////////////////////////
int main(int argc, char* argv[]){
	printf("Starting app\n");
	//writeLED(bled, "1");
	//printf("Done");
	//return 0;
	//strcmp(argv[1], "on")==0;
	//
	if(strcmp(argv[1],"on")==0){
		printf("encendiendo LED\n");
		removeTrigger();
		writeLED(bled,"1");
	}
	else if(strcmp(argv[1], "off")==0){
	printf("apagando LED\n");
	removeTrigger();
	writeLED(bled,"0");
	}
	else if(strcmp(argv[1],"blink")==0){
	printf("blink\n");
	writeLED(tled,"timer");
	writeLED("en","50");
	writeLED("ap","50");
	}
	
	else{
	printf("comando invalido");
	printf("Para encender el LED utilice: ./Nombre_del_archivo2 on \n");
    printf("Para apagar el LED utilice: ./Nombre_del_archivo2 off \n");
    printf("Para hacer parpadear el LED utilice: sudo ./Nombre_del_archivo2 blink \n ");
	}
	printf("programa finalizado");
	return 0;
}	

////////////////////////////////////////////////////////
void writeLED(char fileName[], char value[]){
	FILE* fp;
	char fullName[150];
	sprintf(fullName, LED3_PATH "%s", fileName);
	fp = fopen(fullName, "w+");
	fprintf(fp, "%s", value);
	fclose(fp);
}

void removeTrigger(){
	writeLED(tled, "none");
}