【小安派试玩】无源蜂鸣器演奏midi音乐

本帖最后由 iiv 于 2023-9-3 23:19 编辑

<span style="color: #666666;font-size: 23px">介绍：无源蜂鸣器是一种常见的电子元件，它能发出简单的蜂鸣声。与有源蜂鸣器不同，无源蜂鸣器本身不需要外部电源供电，它利用振动器将电能转换为声能。无源蜂鸣器由一个压电陶瓷振荡器和一个共振腔组成。当通过直流电信号或方波信号输入到无源蜂鸣器时，振荡器内部的压电陶瓷片开始振动，产生声音。这个声音的频率由振荡器的物理特性决定，通常在几千赫兹到几万赫兹之间。无源蜂鸣器结构简单、价格便宜，并且使用方便。它被广泛应用在各种电子设备中，如家电、电子玩具、电子钟表等。常见的应用包括警报提示、提醒功能、按键声音等。需要注意的是，无源蜂鸣器只能产生固定频率的蜂鸣声，无法实现复杂的声音效果。如果需要产生不同频率或连续变化的声音，可能需要借助其他电路或芯片来实现。<br><br><br></span>

<span style="font-size: 20px"> 大家好,楼楼本次分享一下如果使用小安派驱动无源蜂鸣器播放MIDI音乐,它的原理是将乐谱对应的音调转换为蜂鸣器所需的频率和持续时间，然后通过单片机的 GPIO 引脚利用脉冲信号控制蜂鸣器的振动，产生音频频率和持续时间对应的声音。当脉冲信号的频率快时，蜂鸣器发出高音；频率慢时，发出低音。通过改变频率和持续时间，可以模拟不同的音符、音调和节奏。这种简单的音乐播放原理广泛应用于一些电子设备中，如闹钟、电子游戏和电子玩具等。虽然蜂鸣器音质较差，无法还原复杂的音乐，但在一些简单场景下，它是一种经济、简便的音频输出解决方案。</span>

<span style="font-size: 20px;color:#666666"> <br>我们用到的是低电平触发的无源蜂鸣器，就是长下面这个样子：<br><br></span>

<div style="text-align: center;">

<img src="http://bbs.ai-thinker.com/data/attachment/forum/202309/03/212304h248bz72pmtbsbmw.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/300" alt="p1.jpg" title="p1.jpg">

</div>

<span style="font-size: 20px"> <br><br><br><br>视频演示：</span>

<div style="text-align: center;">

<br><br>

<罗刹海市>

<video controls style="width: 650px; height: 400px;"> <source src="https://whxy.shop/tools/?data=lchs.mp4" type="video/mp4"> 你的浏览器不支持播放改视频 </video>

<br><br><br>

<向云端>

<video controls style="width: 650px; height: 400px;"> <source src="https://whxy.shop/tools/?data=xyd.mp4" type="video/mp4"> 你的浏览器不支持播放改视频 </video>

<br><br><br>

<赛马>

<video controls style="width: 650px; height: 400px;"> <source src="https://whxy.shop/tools/?data=saima.mp4" type="video/mp4"> 你的浏览器不支持播放改视频 </video>

<br><br>

</div>

<span style="font-size: 20px"> 代码： </span>

<span style="font-size: 20px"> fmq.h文件，新建一个文件复制进去就可以啦！ </span>

#ifndef __FMQ_H__
#define __FMQ_H__
#include "bflb_mtimer.h"
#include "bflb_pwm_v2.h"
#include "bflb_clock.h"
#include "bflb_gpio.h"
uint8_t CH,pwm_Ch[] = {0, 1, 2, 3}; // PWM通道
struct bflb_device_s *pwm;
struct bflb_device_s *gpio;
void fmq_play(int val,int num);
/**
 * @brief 定义了音调：有3个八度，还有延时
 * 
 */
enum midi{ C0 = 262,D0 =  294, E0 = 330, F0 = 349, G0 = 392, 
A0 = 440, B0 = 494,C = 523,D = 587,E = 659,F = 698,G = 784,
A = 880,B = 988,C1 = 1047,D1 = 1175,E1 = 1319,F1 = 1397,
G1 = 1568,A1 = 1760,B1 = 1976,N = 0,L1 = 4000,L10=6000,
L2 = 2000,L20 = 3000,L4 = 1000,L40 =1500,L8 = 500,
L80 = 750,L16 = 250,L160 = 375,L32 = 125,L320 = 188};



/*======================================================================================================================================*/

//沧海一声笑
int demo_0_midi[] = {A,L80,G,L16,E,L8,D,L8,C,L40,N,L8,E,L80,D,L16,C,L8,A0,L8,G0,L40,N,L8,G0,L80,A0,L16,G0,L80,A0,L16,C,L80,D,L16,E,L8,G,L8,A,L80,G,L16,E,L8,D,L16,C,L16,D,L40,N,L8,
                     A,L8,A,L16,G,L16,E,L8,D,L8,C,L40,N,L8,E,L80,D,L16,C,L8,A0,L8,G0,L40,N,L8,G0,L80,A0,L16,G0,L80,A0,L16,C,L80,D,L16,E,L8,G,L8,A,L80,G,L16,E,L16,D,L16,C,L8,D,L40,N,L8,
                     A,L8,A,L16,G,L16,E,L8,D,L8,C,L40,N,L8,E,L80,D,L16,C,L8,A0,L8,G0,L40,N,L8,G0,L80,A0,L16,G0,L80,A0,L16,C,L80,D,L16,E,L8,G,L8,A,L80,G,L16,E,L16,D,L16,C,L8,D,L40,N,L8,
                     A,L8,A,L16,G,L16,E,L8,D,L8,C,L40,N,L8,E,L80,D,L16,C,L8,A0,L8,G0,L40,N,L8,G0,L80,A0,L16,G0,L80,A0,L16,C,L80,D,L16,E,L8,G,L8,A,L80,G,L16,E,L8,D,L8,C,L40,N,L8};


//别知己
int demo_1_midi[] = {E,L80,A0,L16,A0,L8,C,L16,E,L16,D,L4,B0,L16,A0,L16,G0,L16,A0,L16,A0,L40,N,L8,A0,L16,A0,L16,A,L16,A,L8,A,L16,A,L8,A,L16,G,L16,G,L80,G,L16,E,L16,D,L16,D,L16,E,L16,E,L40,N,L8,E,L16,G,L16,
                    A,L80,A,L16,A,L8,A,L16,G,L16,G,L80,G,L16,E,L16,D,L16,D,L8,E,L80,G,L16,E,L8,D,L8,C,L4,N,L8,E,L16,G,L16,D,L16,D,L16,D,L16,D,L16,D,L8,E,L16,G,L16,D,L80,E,L16,B0,L16,A0,L16,G0,L16,A0,L16,A0,L40,N,L8,
                    E,L80,A0,L16,A0,L8,C,L16,E,L16,D,L80,D,L16,B0,L16,A0,L16,G0,L16,A0,L16,A0,L40,N,L8,A0,L16,A0,L16,A,L80,A,L16,A,L8,A,L16,G,L16,G,L80,G,L16,E,L8,D,L16,E,L16,E,L40,N,L8,E,L16,G,L16,
                    A,L80,A,L16,A,L8,A,L16,G,L16,G,L16,G,L8,G,L16,E,L8,D,L16,D,L16,E,L80,G,L16,E,L8,D,L8,C,L4,N,L8,E,L16,G,L16,D,L16,D,L16,D,L16,D,L16,D,L8,E,L16,G,L16,D,L80,E,L16,B0,L16,A0,L16,G0,L16,A0,L16,
                    A0,L40,N,L8,C,L16,D,L16,E,L16,G,L16,A,L40,A,L8,G,L80,G,L16,E,L8,D,L16,E,L16,E,L40,N,L8,C,L16,D,L16,E,L16,G,L16,A,L40,A,L8,B,L80,B,L16,C1,L8,B,L16,A,L16,A,L40,N,L8,E,L16,G,L16,
                    A,L80,A,L16,A,L8,A,L16,G,L16,G,L16,G,L8,G,L16,E,L8,D,L16,D,L16,E,L80,G,L16,E,L8,D,L8,C,L4,N,L8,E,L16,G,L16,D,L16,D,L16,D,L16,D,L16,D,L8,E,L16,G,L16,D,L80,E,L16,B0,L16,A0,L16,G0,L16,A0,L16,A0,L40};


//孤勇者
int demo_2_midi[] = {E,L40,N,L8,C,L16,D,L16,C,L16,E,L40,N,L8,C,L16,D,L16,C,L16,D,L16,E,L16,A0,L80,C,L16,A0,L80,C,L16,A0,L80,C,L16,D,L8,C,L8,
                      B0,L40,N,L8,E,L40,N,L8,C,L16,D,L16,C,L16,E,L40,N,L8,C,L16,D,L16,C,L16,D,L16,E,L16,A0,L80,C,L16,A0,L80,C,L16,A0,L80,C,L16,E,L8,D,L8,B0,L40,N,L8,
                      A0,L16,C,L16,A,L80,A,L16,A,L16,G,L16,A,L8,A,L16,G,L16,A,L16,G,L16,A,L16,G,L16,E,L16,E,L40,N,L8,A0,L16,C,L16,A,L80,A,L16,A,L16,G,L16,A,L16,G,L16,B,L80,B,L16,B,L16,A,L16,B,L80,
                      A,L8,E,L4,N,L8,E,L16,G,L16,E,L16,D,L80,E,L16,D,L80,E,L16,D,L80,E,L16,G,L16,E,L16,G,L16,E,L16,D,L80,E,L16,D,L80,E,L16,D,L4,N,L8,C,L16,D,L16,
                      E,L8,A0,L8,C,L8,E,L8,D,L8,E,L16,D,L16,C,L16,C,L8,A0,L40,N,L8,A,L16,B,L16,C1,L16,D1,L16,B,L16,C1,L16,C1,L8,C1,L16,B,L16,C1,L16,D1,L16,B,L16,C1,L16,C1,L8,C1,L16,D1,L16,
                      E1,L16,D1,L16,E1,L16,D1,L16,E1,L8,E1,L16,D1,L16,E1,L8,G1,L8,E1,L8,A,L16,B,L16,C1,L16,D1,L16,B,L16,C1,L16,C1,L8,C1,L16,B,L16,C1,L16,D1,L16,B,L16,C1,L16,C1,L8,C1,L16,D1,L16,
                      E1,L16,D1,L16,E1,L16,D1,L16,E1,L8,E1,L16,D1,L16,E1,L8,G1,L8,E1,L8,G1,L8,E1,L80,G1,L16,E1,L80,G1,L16,E1,L16,G1,L16,A1,L16,E1,L16,G1,L8,G1,L8,E1,L8,G1,L16,E1,L8,G1,L16,E1,L16,G1,L16,A1,L16,E1,L16,G1,L8,G1,L16,G1,L16,
                      E1,L16,D1,L16,D1,L8,D1,L8,C1,L16,E1,L8,D1,L16,D1,L8,D1,L8,C1,L16,C1,L16,A,L40,N,L8,G1,L16,G1,L16,E1,L16,D1,L16,D1,L8,D1,L8,C1,L16,E1,L8,D1,L16,D1,L8,D1,L8,C1,L16,C1,L16,A,L4};


//赛马
int demo_3_midi[] = {A,L40,E,L16,G,L16,A,L40,E,L16,G,L16,A,L40,E,L16,G,L16,A,L40,E,L16,G,L16,A,L16,G,L16,E,L16,G,L16,A,L16,G,L16,E,L16,G,L16,A,L16,G,L16,E,L16,G,L16,A,L16,G,L16,E,L16,G,L16,
                    A,L8,G,L16,A,L8,G,L8,A,L16,A,L8,G,L8,A,L16,A,L8,G,L8,A,L16,A,L8,A0,L8,E,L8,C,L8,A0,L8,E,L8,A,L8,G,L8,E,L8,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,
                    A0,L8,E,L8,C,L8,A0,L8,E,L8,A,L8,G,L8,E,L8,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L40,A0,L16,C,L16,D,L40,A0,L16,C,L16,
                    D,L40,A0,L16,C,L16,D,L40,A0,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L8,C,L16,D,L8,D,L8,C,L16,D,L8,D,L8,C,L16,D,L8,D,L8,C,L16,D,L8,
                    A0,L4,A,L4,G,L4,E,L4,D,L4,G,L4,E,L4,C,L4,A0,L4,A,L8,B,L8,G,L4,E,L4,D,L4,G,L4,E,L4,D,L4,A0,L4,C,L16,D,L16,A0,L40,C,L16,D,L16,
                    A0,L40,C,L16,D,L16,A0,L40,C,L16,D,L16,A0,L16,D,L16,C,L16,D,L16,A0,L16,D,L16,C,L16,D,L16,A0,L16,D,L16,C,L16,D,L16,A0,L16,D,L16,C,L16,D,L16,A0,L4,A0,L8,A0,L8,A0,L4,N,L8,
                    E,L4,A,L8,C1,L16,G,L40,E,L8,G,L8,A,L8,C1,L8,D1,L16,C1,L16,A,L40,N,L8,E,L4,A,L80,C1,L16,G,L4,G,L8,E,L8,D,L8,E,L8,A,L8,G,L8,E,L40,N,L8,
                    G,L4,A,L80,C1,L16,C,L40,A0,L8,D,L8,E,L8,A,L8,G,L8,E,L4,E,L8,D,L8,C,L80,D,L16,E,L8,G,L8,A,L4,A0,L4,D,L8,E,L8,C,L4,A0,L40,N,L8,
                    E,L8,E,L16,E,L16,A,L8,C1,L16,C1,L16,G,L8,G,L16,G,L16,G,L8,E,L16,E,L16,G,L8,G,L16,A,L16,C1,L8,D1,L16,C1,L16,A,L8,A,L16,A,L16,A,L8,A,L16,A,L16,E,L8,E,L16,E,L16,A,L8,C1,L16,C1,L16,
                    A,L8,A,L16,A,L16,A,L8,E,L16,E,L16,D,L16,D,L16,E,L8,A,L16,G,L16,G,L8,E,L16,E,L16,G,L8,E,L8,A0,L8,G,L8,G,L16,G,L16,A,L8,C1,L16,C1,L16,C,L8,C,L16,C,L16,C,L8,A0,L8,D,L8,D,L16,E,L16,A,L8,G,L16,G,L16,
                    E,L8,E,L16,G,L16,E,L8,D,L8,C,L16,A0,L16,C,L16,D,L16,E,L16,D,L16,E,L16,G,L16,A,L16,G,L16,A,L16,C1,L16,G,L16,A,L16,G,L16,E,L16,D,L16,E,L16,D,L16,C,L16,D,L16,C,L16,A0,L16,C,L16,A0,L4,A,L4};


//早安隆回
int demo_4_midi[] = {E,L8,A,L8,A,L4,A,L8,A,L4,A,L8,B,L8,B,L8,C1,L8,B,L8,A,L8,A,L40,N,L8,
                    B,L8,B,L4,B,L8,B,L8,C1,L8,B,L8,A,L40,N,L8,E,L8,A,L8,A,L4,A,L8,A,L4,A,L8,B,L8,B,L8,C1,L8,B,L8,A,L40,N,L8,
                    B,L8,B,L4,C1,L8,D1,L8,D1,L8,C1,L8,B,L8,A,L40,N,L8,D1,L8,E1,L8,E1,L8,E1,L8,E1,L8,E1,L4,C1,L8,D1,L4,E1,L8,D1,L40,N,L8,
                    F1,L8,F1,L4,F1,L8,F1,L8,G1,L8,F1,L8,E1,L40,N,L8,D1,L8,E1,L8,E1,L8,E1,L8,E1,L8,E1,L4,C1,L8,D1,L4,E1,L8,D1,L40,N,L8,
                    D1,L8,D1,L4,D1,L8,D1,L8,E1,L8,C1,L8,A,L40,N,L8,E,L8,A,L8,A,L4,A,L8,A,L4,A,L8,B,L8,B,L8,C1,L8,B,L8,A,L40,N,L8,
                    B,L8,B,L4,B,L8,B,L8,C1,L8,B,L8,A,L8,A,L4,N,L8,E,L8,A,L8,A,L4,A,L8,A,L4,A,L8,B,L8,B,L8,C1,L8,B,L8,A,L40,N,L8,
                    B,L8,B,L4,C1,L8,D1,L8,D1,L8,C1,L8,B,L8,A,L40,N,L8,D1,L8,E1,L8,E1,L8,E1,L8,E1,L8,E1,L4,C1,L8,C1,L8,D1,L8,E1,L8,D1,L40,N,L8,
                    F1,L8,F1,L4,F1,L8,F1,L8,G1,L8,F1,L8,E1,L40,N,L8,D1,L8,E1,L8,E1,L8,E1,L8,E1,L8,E1,L4,C1,L8,D1,L4,E1,L8,D1,L40,N,L8,
                    D1,L8,D1,L40,D1,L8,E1,L8,C1,L8,B,L8,A,L40,N,L8,E,L8,A,L8,A,L8,A,L8,A,L8,A,L4,N,L8,C1,L8,E1,L8,E1,L8,D1,L8,E1,L40,N,L8,
                    D1,L8,D1,L4,D1,L8,G1,L8,G1,L8,G1,L8,A1,L8,D1,L16,E1,L40,N,L8,D1,L8,E1,L8,E1,L8,E1,L8,E1,L40,C1,L8,D1,L8,D1,L8,E1,L8,D1,L40,N,L8,
                    D1,L8,D1,L8,D1,L40,E1,L8,C1,L8,A,L40,N,L8,E,L8,A,L8,A,L8,A,L8,A,L8,A,L4,N,L8,C1,L8,E1,L8,E1,L8,D1,L8,E1,L40,N,L8,
                    D1,L8,D1,L4,D1,L8,G1,L8,G1,L8,G1,L8,A1,L8,D1,L16,E1,L40,N,L8,D1,L8,E1,L8,E1,L8,E1,L8,E1,L40,C1,L8,D1,L8,D1,L8,E1,L8,D1,L40,N,L8,
                    D1,L8,D1,L4,D1,L8,D1,L8,E1,L8,C1,L8,A,L40};


//在云端
int demo_5_midi[] = {G,L8,E,L16,G,L16,G,L40,E,L16,G,L16,E,L4,D,L16,E,L16,D,L16,C,L16,E,L2,C,L8,G,L16,A,L16,A,L40,G,L8,A,L16,G,L4,E,L16,G,L16,E,L16,D,L16,E,L4,N,L8,
                    G,L8,E,L16,G,L16,G,L4,E,L16,G,L16,E,L4,D,L16,E,L16,D,L16,C,L16,E,L80,C,L40,N,L8,D,L16,E,L16,D,L16,C,L16,D,L4,N,L8,D,L16,C,L16,D,L16,E,L8,D,L8,C,L80,C,L4,N,L8,
                    G,L8,E,L16,G,L16,G,L4,E,L16,G,L16,E,L4,D,L16,E,L16,D,L16,C,L16,E,L4,N,L8,C,L8,G,L16,A,L16,A,L4,G,L8,A,L16,G,L4,E,L16,G,L16,E,L16,D,L16,E,L4,N,L8,
                    G,L8,E,L16,G,L16,G,L4,N,L4,D,L16,E,L8,D,L4,D,L16,C,L16,E,L80,C,L4,N,L4,D,L16,E,L16,D,L16,C,L16,D,L4,N,L8,D,L16,C,L16,E,L8,D,L8,E,L16,D,L8,C,L16,C,L4,N,L4,
                    G,L16,A,L16,G,L8,N,L8,A,L8,A,L16,G,L16,E,L16,G,L16,E,L4,N,L4,D,L16,E,L16,D,L4,N,L8,G,L8,G,L16,E,L16,D,L16,E,L16,D,L4,
                    G,L16,A,L16,A,L4,N,L8,A,L8,A,L16,G,L16,E,L16,G,L16,E,L4,N,L8,D,L16,E,L16,D,L8,A0,L8,N,L4,D,L16,C,L16,D,L16,E,L16,D,L16,C,L16,D,L4,N,L4};


// 罗刹海市
int demo_6_midi[] = {E1,L4,E1,L4,E1,L4,G,L4,G,L8,A,L8,A,L8,C1,L8,C,L8,A,L8,N,L8,A1,L4,G1,L4,E1,L4,E1,L4,G1,L8,E1,L8,E1,L4,D1,L4,N,L8,E1,L4,C1,L4,E1,L4,E1,L4,E1,L4,A,L4,C1,L4,N,L8,C1,L4,C1,L4,G,L4,
                     A,L4,A,L16,C1,L16,A,L8,G,L4,E,L4,N,L8,E,L4,A1,L4,A1,L4,E,L4,G,L8,A1,L4,A1,L4,N,L8,E1,L4,E1,L4,B,L8,A,L4,B,L16,A,L16,G,L4,E,L4,N,L8,E1,L4,E1,L4,E1,L8,G1,L8,E1,L8,D1,L8,A,L4,C1,L4,
                    C1,L4,E,L4,N,L16,D1,L8,B,L8,A,L4,A,L16,C1,L16,A,L8,G,L4,E,L4,G,L8,A,L4,G,L8,A,L4,A,L4,C1,L4,A1,L4,N,L8,A,L4,E,L4,G,L4,A,L4,A,L8,G,L8,A,L4,C1,L16,D1,L16,C1,L4,C,L4,C,L4,G,L4,E,L4,G,L8,
                    E,L4,N,L8,E1,L4,E1,L4,E1,L8,G1,L8,E1,L8,D1,L8,A,L4,C1,L4,N,L8,E,L4,D1,L8,B,L8,A,L4,A,L16,C1,L16,A,L8,G,L4,E,L4,N,L8,G,L4,E,L4,G,L4,A,L4,A,L8,C1,L8,A,L4,G,L4,D,L4,G,L4,
                    N,L8,E1,L8,E1,L8,E1,L8,A,L4,G,L4,D1,L8,B,L8,A,L4,N,L8,E1,L4,E1,L4,E1,L4,E1,L4,G1,L4,A,L4,C1,L4,A1,L4,G1,L4,D1,L4,E1,L4,G1,L8,E1,L4,N,L8,A1,L4,A1,L4,A1,L4,A1,L4,
                    2218,L4,A1,L4,G1,L8,E1,L8,D1,L8,E1,L8,E1,L8,G1,L8,E1,L8,D1,L8,D1,L8,B,L8,A,L4,A,L4,E,L4,G,L4,A,L4,A,L4,D1,L8,B,L8,A,L8,G,L8,N,L8,E,L4,E,L4,G,L4,C,L4,A0,L4,
                    N,L8,E,L4,G,L4,E,L4,A0,L4,A0,L4,C,L4,A0,L4,N,L8,A,L4,A,L4,G,L4,E,L4,G,L8,E,L4,A,L4,A,L4,D1,L4,B,L4,A,L4,E,L4,A,L4,D,L4,G,L4,E,L4,N,L8,
                    D1,L4,D1,L4,D1,L4,B,L4,A,L4,G,L4,N,L8,E,L4,D1,L4,B,L4,A,L4,A,L4,G,L4,E,L4,N,L8,E,L8,G,L8,D,L4,D,L4,B0,L4,A0,L4,A0,L4,
};


/*======================================================================================================================================*/
/*======================================================================================================================================*/
// 沧海一声笑
void player_0(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_0_midi)/sizeof(demo_0_midi[0])); j = j + 1) {
                        fmq_play(demo_0_midi[(int)(j)],(((float)demo_0_midi[(int)(j + 1)] / 1000) * T));
                        j++;
                }
}

// 别知己
void player_1(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_1_midi)/sizeof(demo_1_midi[0])); j = j + 1) {
                        fmq_play(demo_1_midi[(int)(j)],(((float)demo_1_midi[(int)(j + 1)] / 1000) * T));
                        j++;
        }
}

// 孤勇者
void player_2(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_2_midi)/sizeof(demo_2_midi[0])); j = j + 1) {
                        fmq_play(demo_2_midi[(int)(j)],(((float)demo_2_midi[(int)(j + 1)] / 1000) * T));
                        j++;
        }
}

// 赛马
void player_3(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_3_midi)/sizeof(demo_3_midi[0])); j = j + 1) {
                        fmq_play(demo_3_midi[(int)(j)],(((float)demo_3_midi[(int)(j + 1)] / 1000) * T));
                        j++;
        }
}

// 早安隆回
void player_4(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_4_midi)/sizeof(demo_4_midi[0])); j = j + 1) {
                        fmq_play(demo_4_midi[(int)(j)],(((float)demo_4_midi[(int)(j + 1)] / 1000) * T));
                        j++;
        }
}

// 向云端 T：70
void player_5(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_5_midi)/sizeof(demo_5_midi[0])); j = j + 1) {
                        fmq_play(demo_5_midi[(int)(j)],(((float)demo_5_midi[(int)(j + 1)] / 1000) * T));
                        j++;
        }
}


// 罗刹海市  T：130
void player_6(int t){
        float T = (float)60/t*1000;
        for (int j = (0); j < (sizeof(demo_6_midi)/sizeof(demo_6_midi[0])); j = j + 1) {
                        fmq_play(demo_6_midi[(int)(j)],(((float)demo_6_midi[(int)(j + 1)] / 1000) * T));
                        j++;
        }
}



/**
 * @brief 播放一个midi
 * 
 * @param val 播放曲子的编号,0：沧海一声笑，1：别知己，2：孤勇者，3：赛马T110，4:早安隆回,5：向云端T70，6：罗刹海市T130
 * @param T 速度
 */
void fmq_play_demo(int val,int T){
        switch (val)
        {
        case 0:
                //沧海一声笑
                player_0(T);
                break;
        case 1:
                //别知己
                player_1(T);
                break;
        case 2:
                //孤勇者
                player_2(T);
                break;
        case 3:
                //赛马
                player_3(T);
                break;
        case 4:
                //早安隆回
                player_4(T);
                break;
        case 5:
                //向云端
                player_5(T);
                break;
    case 6:
                //罗刹海市
                player_6(T);
                break;
        }
}



/**
 * @brief 初始化蜂鸣器
 * 
 * @param pin 引脚号
 * @param vol 音量，1-100
 */
void fmq_init(uint8_t pin, uint16_t vol){ 

    if(pin > 34)return; // 如果引脚超过34就退出

    // 取出引脚对应pwm通道
    for (int i = 0; i < 4; i++) {
        if (pin % 4 == pwm_Ch[i]) {
            CH = i;
        }
    }

    vol = 100 - vol;
    pwm = bflb_device_get_by_name("pwm_v2_0");
    gpio = bflb_device_get_by_name("gpio");
    /*初始化IO ，pwm0*/
    bflb_gpio_init(gpio, pin, GPIO_FUNC_PWM0 | GPIO_ALTERNATE | GPIO_PULLUP | GPIO_SMT_EN | GPIO_DRV_1);

    /*初始化PWM输出*/
    struct bflb_pwm_v2_config_s cfg = {
    .clk_source = BFLB_SYSTEM_XCLK,  // PWM时钟源，
    .clk_div = 40,  // PWM时钟分频器
    .period = 1000,  // PWM计数周期
    };
    bflb_pwm_v2_init(pwm, &cfg);
    bflb_pwm_v2_channel_set_threshold(pwm, CH, vol, 100); //调整占空比,可以调整蜂鸣器音量，
    bflb_pwm_v2_channel_positive_start(pwm, CH);

}


/**
 * @brief 演奏一个音符
 * 
 * @param val 音符
 * @param num 延时
 */
void fmq_play(int val,int num){
    int period = 1000000 / val;
    // bflb_pwm_v2_stop(pwm);  
    bflb_pwm_v2_set_period(pwm,period); 
    bflb_pwm_v2_start(pwm);
    bflb_mtimer_delay_ms(num);
    bflb_pwm_v2_stop(pwm);
    bflb_mtimer_delay_ms(3); 
}

#endif

<span style="font-size: 20px"> main.c </span>

#include "board.h"
#include "fmq.h"



int main(void)
{
    board_init();
    //初始化，引脚号，音量
    fmq_init(31,15);
    //蜂鸣器播放一首曲子
    fmq_play_demo(5, 70);
    while (1) {
        bflb_mtimer_delay_ms(1000);
    }
}

<span style="font-size: 20px">代码调用很简单，楼楼里面也写的很清楚啦，大家如果感兴趣的话可以试着玩一下，如果代码有不对的地方，大家可以自行修改！ </span>

<span style="font-size: 20px"> 好啦，以上就是楼楼本次的分享，如果有喜欢的歌也可以留言给楼楼，楼楼有空的话响给你听！ </span>

<span style="font-size: 20px;color:#8bded5"> <br>写在最后：如果你想添加自己喜欢的音乐，下面是一个midi代码编写指南： </span>

<span style="font-size: 18px;color:#8bded5"> 参考demo，一个音符跟一个时值，开头必须是音符，末尾必须是一个时值，都是用大写字母表示，一共有3个八度，C0[低音]，C[中音]，C1[高音]，C代表音符[1234567]对应的[ABCDEFG]，后面的数字表示演奏哪个八度，0是低八度，1是高八度，什么没有就是中音，时值用大写L表示。如：L4，代表4分音符，时值分别有：[L1,L2,L4,L8,L16,L32]，分别对应着[全音符，2分，4分，8分，16分，32分音符]，在时值LX的后面加一个0可以表示一位附点音符，如：L40,L80...，字母N表示休止符，在需要停顿的地方使用 </span> [/i]

期哥优秀

“需要注意的是，无源蜂鸣器只能产生固定频率的蜂鸣声，无法实现复杂的声音效果。如果需要产生不同频率或连续变化的声音，可能需要借助其他电路或芯片来实现。”这一块对于无源蜂鸣器是否能产生不同频率的声音描述是否有误？

高端操作啊

6啊，期哥怎么传的视频啊

期哥优秀！

优秀！

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