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| /*********************************************************************************
| * 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 <unistd.h>
| #include <fcntl.h>
| #include <dirent.h>
| #include <string.h>
| #include <time.h>
| #include <errno.h>
|
| #include <wiringPi.h>
| #include "beep.h"
|
| /*+-----------------------------+
| *| Turn buzzer on or off API |
| *+-----------------------------+*/
|
| int turn_passive_beep(int cmd, int freq)
| {
| int range;
|
| if(OFF == cmd)
| {
| pwmWrite(PWM_PIN, 0);
| pinMode(PWM_PIN, INPUT) ;
| }
| else
| {
|
| if(freq<2000 || freq>5000)
| {
| printf("Beep set invalid PWM frequency[%d]!\n", freq);
| return -1;
| }
|
| /* 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;
| }
|
|
| /*+---------------------------------+
| *| Play Tone OD,RE,MI....XI,DO1 |
| *+---------------------------------+*/
|
| enum
| {
| UNUSED=0,
| DO,
| RE,
| MI,
| FA,
| SO,
| LA,
| XI,
| DO1,
| RI1,
| TONE_MAX,
| };
|
| #define msleep(x) usleep( 1000*(x) )
|
| static int tone_freq[TONE_MAX]={0, 2093, 2349, 2637, 2794, 3136, 3520, 3952, 4186, 4698 };
| //static int tone_freq[TONE_MAX]={0, 2000, 2130, 2250, 2360, 2450, 2530, 2620, 2700, 2780};
|
| static inline void play_tone(int tone, int delay)
| {
| if(tone<DO || tone>RI1)
| return ;
|
| turn_passive_beep(ON, tone_freq[tone]);
| msleep(delay);
| turn_passive_beep(OFF, 0);
| }
|
| void play_tone_freq(void)
| {
| int i;
|
| for(i=DO; i<TONE_MAX; i++)
| {
| play_tone( i, 500 );
| msleep(500);
| }
| }
|
|
| /*+------------------------------+
| *| Play song "Little Start" |
| *+------------------------------+*/
|
| typedef struct tone_s
| {
| int tone;
| int delay_ms;
|
| } tone_t;
|
| #define DEF_DELAY 350
| static tone_t little_start_notation[]=
| {
| {DO, DEF_DELAY},
| {DO, DEF_DELAY},
| {SO, DEF_DELAY},
| {SO, DEF_DELAY},
| {LA, DEF_DELAY},
| {LA, DEF_DELAY},
| {SO, DEF_DELAY*2},
|
| {FA, DEF_DELAY},
| {FA, DEF_DELAY},
| {MI, DEF_DELAY},
| {MI, DEF_DELAY},
| {RE, DEF_DELAY},
| {RE, DEF_DELAY},
| {DO, DEF_DELAY*2},
|
|
| {SO, DEF_DELAY},
| {SO, DEF_DELAY},
| {FA, DEF_DELAY},
| {FA, DEF_DELAY},
| {MI, DEF_DELAY},
| {MI, DEF_DELAY},
| {RE, DEF_DELAY*2},
|
|
| {SO, DEF_DELAY},
| {SO, DEF_DELAY},
| {FA, DEF_DELAY},
| {FA, DEF_DELAY},
| {MI, DEF_DELAY},
| {MI, DEF_DELAY},
| {RE, DEF_DELAY*2},
| };
|
| #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
| void play_little_star(void)
| {
| int i;
|
| for(i=0; i<ARRAY_SIZE(little_start_notation); i++)
| {
| play_tone(little_start_notation[i].tone, little_start_notation[i].delay_ms);
| msleep(30);
| }
| }
|
|
