使用stm32f103实现蜂鸣器播放歌曲天外来物

使用STM32F103实现蜂鸣器播放歌曲《天外来物》的代码如下：

#include "stm32f10x.h"

// 定义蜂鸣器引脚
#define BUZZER_PIN GPIO_Pin_0
#define BUZZER_PORT GPIOA

// 定义音符频率
#define C4  262
#define D4  294
#define E4  330
#define F4  349
#define G4  392
#define A4  440
#define B4  494

// 定义每个音符的持续时间
#define QUA  500
#define HAF  1000
#define EIG  125

// 定义歌曲
int song[] = {E4, F4, G4, A4, G4, F4, E4, E4, F4, G4, A4, G4, F4, E4, E4, F4, G4, A4, B4, A4, G4, F4, E4, E4, E4, F4, G4, A4, G4, F4, E4, E4, F4, G4, A4, G4, F4, E4, E4, F4, G4, A4, B4, A4, G4, F4, E4};

// 定义歌曲的时值
int duration[] = {QUA, QUA, QUA, HAF, QUA, QUA, HAF, QUA, QUA, QUA, HAF, QUA, QUA, HAF, QUA, QUA, QUA, HAF, QUA, QUA, HAF, QUA, QUA, QUA, QUA, QUA, QUA, QUA, HAF, QUA, QUA, HAF, QUA, QUA, QUA, HAF, QUA, QUA, HAF, QUA, QUA, QUA, HAF, QUA, QUA, HAF, QUA, QUA, QUA, QUA, QUA, QUA, QUA, HAF};

// 播放音符
void play_note(int note, int duration) {
    int i, t;
    t = 1000000 / note;
    for (i = 0; i < duration * 1000 / (t * 2); i++) {
        GPIO_SetBits(BUZZER_PORT, BUZZER_PIN);
        Delay_us(t);
        GPIO_ResetBits(BUZZER_PORT, BUZZER_PIN);
        Delay_us(t);
    }
}

// 延时函数
void Delay_us(u32 nCount) {
    u32 i;
    for (i = 0; i < nCount * 8; i++);
}

int main(void) {
    int i;
    GPIO_InitTypeDef GPIO_InitStructure;
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = BUZZER_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(BUZZER_PORT, &GPIO_InitStructure);
    while (1) {
        for (i = 0; i < sizeof(song) / sizeof(song[0]); i++) {
            play_note(song[i], duration[i]);
            Delay_us(EIG * 1000);
        }
    }
}

代码中将歌曲《天外来物》的音符与时值分别存储在数组song和duration中，通过play_note函数实现了蜂鸣器的播放功能，并通过Delay_us函数实现了不同音符之间的时间间隔。需要注意的是，蜂鸣器的引脚需要通过GPIO_Init函数进行初始化，才能使蜂鸣器正常工作。