/*********************************************************************************
 *      Copyright:  (C) 2018 LingYun IoT System Studio
 *                  All rights reserved.
 *
 *       Filename:  led.c
 *    Description:  This file is used to control Passive buzzer or Active buzzer
 *
 *     pi@raspberrypi:~ $ gpio readall show BCM and wPi pinmap  
 *
 *                  VCC ---- 5V/3.3V
 *                  GND ---- GND
 *                  I/O ---- GPIO.18  ---- GPIO.1    
 *                           BCM           wPi 
 *                 
 *        Version:  1.0.0(2018/10/14)
 *         Author:  Guo Wenxue <guowenxue@gmail.com>
 *      ChangeLog:  1, Release initial version on "2018/10/14 12:13:26"
 *                 
 ********************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <time.h>
#include <errno.h>

#include <wiringPi.h>
#include "beep.h"

//#define CONFIG_ACTV_BEEP

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

	while(1)
	{
#ifdef CONFIG_ACTV_BEEP
		turn_active_beep(ON);
#else
		turn_passive_beep(ON, BEEP_FREQ);
#endif
		sleep(1);

#ifdef CONFIG_ACTV_BEEP
		turn_active_beep(OFF);
#else
		turn_passive_beep(OFF, BEEP_FREQ);
#endif
		sleep(1);
	}

        return 0;
}


int turn_passive_beep(int cmd, int freq)
{
       	int range;

	if(freq<2000 || freq>2500)
	{
		printf("Beep set invalid PWM frequency!\n");
		return -1;
	}

	if(OFF == cmd)
	{
	       	pwmWrite(PWM_PIN, 0);
	       	pinMode(PWM_PIN, INPUT) ;
	}
	else
	{
		/* Set GPIO as PWM output mode */
	       	pinMode(PWM_PIN, PWM_OUTPUT) ;

		/* Set PWM mode as ms mode */
	       	pwmSetMode(PWM_MODE_MS);

		/* Set PWM clock: 19.2MHz/32=600KHz */
	       	pwmSetClock(32);

		/* Set PWM frequency */
		range=600000/freq;
		pwmSetRange(range);

		/* Set PWM duty 50% */
		pwmWrite(PWM_PIN, range/2);
	}
}

/* Turn ON/OFF buzzer, Active Buzzer can not set frequency */
int turn_active_beep(int cmd)
{

        /* Active buzzer VCC connect to:
           5V: Both high and low level will be on
         3.3V: Low level be on and High level be off

	   So we use INPUT or OUTPUT to control the Beeper
	*/
	if(OFF == cmd)
	{
	       	pinMode(PWM_PIN, INPUT);
	}
	else
	{
	       	pinMode(PWM_PIN, OUTPUT);
		digitalWrite(PWM_PIN, LOW);
	}

	return 0;
}