用C语言编写一个驱动stm32 喇叭播放贝多芬的命运交响曲的程序

要编写一个驱动STM32喇叭播放贝多芬的命运交响曲的程序，需要用到STM32的音频输出模块和相应的音频文件解码库。以下是一个简单的程序框架：

1. 配置音频输出模块和时钟。

#include "stm32f10x.h"
#include "stm32f10x_conf.h"

void RCC_Configuration(void)
{
  /* Enable GPIOA and AFIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
  /* Enable TIM6 and DAC clocks */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6 | RCC_APB1Periph_DAC, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure PA4 as DAC channel 1 output */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void TIM6_Configuration(void)
{
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

  /* Configure TIM6 to trigger DAC */
  TIM_TimeBaseStructure.TIM_Prescaler = 0;
  TIM_TimeBaseStructure.TIM_Period = 1000;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM6, &TIM_TimeBaseStructure);
  TIM_SelectOutputTrigger(TIM6, TIM_TRGOSource_Update);
  TIM_Cmd(TIM6, ENABLE);
}

void DAC_Configuration(void)
{
  DAC_InitTypeDef DAC_InitStructure;

  /* Configure DAC */
  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T6_TRGO;
  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bit0;
  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
  DAC_Init(DAC_Channel_1, &DAC_InitStructure);
  DAC_Cmd(DAC_Channel_1, ENABLE);
}

2. 配置音频文件解码库，读取音频文件。

#include "stm32f10x.h"
#include "stm32f10x_conf.h"
#include "mp3dec.h"

#define MP3_BUFFER_SIZE 1024

int main(void)
{
  int16_t pcm_sample[MP3_BUFFER_SIZE / 2];
  uint8_t mp3_buffer[MP3_BUFFER_SIZE];
  HMP3Decoder mp3_decoder;
  uint32_t mp3_bytes_left;
  uint8_t* mp3_read_ptr;
  uint32_t mp3_error;

  /* Initialize decoder */
  mp3_decoder = MP3InitDecoder();

  /* Open audio file */
  FILE* audio_file = fopen("beethoven.mp3", "rb");
  if (audio_file == NULL) {
    /* Handle error */
  }

  /* Read and decode audio data */
  while (1) {
    /* Read MP3 data from file */
    mp3_bytes_left = fread(mp3_buffer, 1, MP3_BUFFER_SIZE, audio_file);
    if (mp3_bytes_left == 0) {
      /* End of file reached */
      break;
    }

    /* Decode MP3 data */
    mp3_error = MP3Decode(mp3_decoder, &mp3_read_ptr, &mp3_bytes_left, pcm_sample, 0);
    if (mp3_error != ERR_MP3_NONE) {
      /* Handle error */
    }

    /* Send PCM data to DAC */
    for (int i = 0; i < MP3_BUFFER_SIZE / 2; i++) {
      DAC_SetChannel1Data(DAC_Align_12b_R, pcm_sample[i]);
    }
  }

  /* Close audio file */
  fclose(audio_file);

  /* Deinitialize decoder */
  MP3FreeDecoder(mp3_decoder);

  while (1) {
    /* Wait for interrupt */
  }
}

3. 将PCM数据发送给音频输出模块的DAC，播放音乐。

#include "stm32f10x.h"
#include "stm32f10x_conf.h"

int main(void)
{
  int16_t pcm_sample[MP3_BUFFER_SIZE / 2];
  uint8_t mp3_buffer[MP3_BUFFER_SIZE];
  HMP3Decoder mp3_decoder;
  uint32_t mp3_bytes_left;
  uint8_t* mp3_read_ptr;
  uint32_t mp3_error;

  /* Initialize decoder */
  mp3_decoder = MP3InitDecoder();

  /* Open audio file */
  FILE* audio_file = fopen("beethoven.mp3", "rb");
  if (audio_file == NULL) {
    /* Handle error */
  }

  /* Read and decode audio data */
  while (1) {
    /* Read MP3 data from file */
    mp3_bytes_left = fread(mp3_buffer, 1, MP3_BUFFER_SIZE, audio_file);
    if (mp3_bytes_left == 0) {
      /* End of file reached */
      break;
    }

    /* Decode MP3 data */
    mp3_error = MP3Decode(mp3_decoder, &mp3_read_ptr, &mp3_bytes_left, pcm_sample, 0);
    if (mp3_error != ERR_MP3_NONE) {
      /* Handle error */
    }

    /* Send PCM data to DAC */
    for (int i = 0; i < MP3_BUFFER_SIZE / 2; i++) {
      DAC_SetChannel1Data(DAC_Align_12b_R, pcm_sample[i]);
    }
  }

  /* Close audio file */
  fclose(audio_file);

  /* Deinitialize decoder */
  MP3FreeDecoder(mp3_decoder);

  while (1) {
    /* Wait for interrupt */
  }
}

注意，以上是一个简单的程序框架，实际编写时需要根据具体的硬件和软件环境进行适当的修改和调试。