/*********************************************************************************
|
* 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;
|
}
|
