Jasper Fan Worker

Fan.c

#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int PIN = 4;

void getStatus(){
	
    printf("%d\n", digitalRead(PIN));

}

void turnOn(){
	
    pinMode(PIN, OUTPUT);
    digitalWrite(PIN, LOW);
    printf("%d\n", digitalRead(PIN));
	
}

void turnOff(){

    pinMode(PIN, OUTPUT);
    digitalWrite(PIN, HIGH);
    printf("%d\n", digitalRead(PIN));
	
}

int main(int argc, char *argv[])
{

    if(argc != 3) {
    
        printf("Invalid parameters: You must supply a GPIO pin and a function as a parameter. \n");
        exit(1);
            
    } else {
		
        if (wiringPiSetupGpio() == -1) {
	
	    exit(1);
	
	}
        
        sscanf(argv[1], "%d", &PIN);
        
        if(PIN > 25) {
        
            printf("%d is not a valid pin\n", PIN);
            exit(1);
        
        } 
		
	if(strcmp(argv[2], "-status") == 0){

	    getStatus();
			
	} else if(strcmp(argv[2], "-on") == 0){

	    turnOn();
			
	} else if(strcmp(argv[2], "-off") == 0){

	    turnOff();
			
	} else {
			
	    printf("%s is not a valid parameter\n", argv[2]);
	    printf("The acceptable parameters are:\n");
            printf("  -status\n  -on\n  -off\n");
            exit(1);
			
	}

    }

    return(0);
	
}