/*
ADT_wiringPi.c
PWM Example.
By Semillero ADT UPB-Bucaramanga
*/


#include <wiringPi.h>
#include <softPwm.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>

#define ADT_GPIO_17 0
#define EVENT_EXIT (void)signal(SIGINT,control_event);\
(void)signal(SIGQUIT,control_event)


/*the event exit of app*/
void control_event(int sig){
	softPwmWrite(ADT_GPIO_17,0);
	delay(10);/*10 ms*/
	exit(0);
}

int main(void)
{

EVENT_EXIT;


char count=0;
char flag=0;


if(wiringPiSetup()==-1){printf("Oh my God!! :)\n"); return 0;}

printf("Creating PWM\n");
/* first argument GPIO, Initial Value, PWM Range thread period*/
softPwmCreate(ADT_GPIO_17,0,100);

printf("Setting PWM\n");
/*write to GPIO, Duty*/
softPwmWrite(ADT_GPIO_17,0);

	while(1){
		
		if(flag==0){
			count++;/*counter pwm*/
			if(count>=100){flag=1;}
			
		}
		else if(flag==1){
			count--;/*counter pwm*/
			if(count<=0){flag=0;}
		}
		delay(10);/*10 ms*/
		softPwmWrite(ADT_GPIO_17,count);	
	}
}