STM32语音播放模块代码

以下是使用STM32F4开发板和DFPlayer Mini模块播放音频文件的示例代码：

#include "stm32f4xx.h"
#include "stm32f4_discovery.h"

// UART communication with DFPlayer Mini
#define DFPLAYER_UART USART2

// Pins connected to DFPlayer Mini
#define DFPLAYER_TX GPIO_Pin_2
#define DFPLAYER_RX GPIO_Pin_3

// Commands for DFPlayer Mini
#define DFPLAYER_PLAY_NEXT 0x01
#define DFPLAYER_PLAY_PREV 0x02
#define DFPLAYER_PLAY_SPECIFIC 0x03
#define DFPLAYER_VOLUME_UP 0x04
#define DFPLAYER_VOLUME_DOWN 0x05
#define DFPLAYER_SET_VOLUME 0x06
#define DFPLAYER_SET_EQ 0x07
#define DFPLAYER_LOOP_PLAYBACK 0x08
#define DFPLAYER_STOP_PLAYBACK 0x0E

// Volume levels
#define DFPLAYER_MIN_VOLUME 0x00
#define DFPLAYER_MAX_VOLUME 0x1E

USART_InitTypeDef USART_InitStruct;

void DFPlayer_SendCommand(uint8_t command, uint16_t parameter)
{
    uint8_t checksum = -(0xAA + 0x01 + 0x00 + command + (parameter >> 8) + (parameter & 0xFF));

    USART_SendData(DFPLAYER_UART, 0xAA);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
    USART_SendData(DFPLAYER_UART, 0x01);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
    USART_SendData(DFPLAYER_UART, 0x00);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
    USART_SendData(DFPLAYER_UART, command);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
    USART_SendData(DFPLAYER_UART, parameter >> 8);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
    USART_SendData(DFPLAYER_UART, parameter & 0xFF);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
    USART_SendData(DFPLAYER_UART, checksum);
    while (USART_GetFlagStatus(DFPLAYER_UART, USART_FLAG_TXE) == RESET);
}

void DFPlayer_PlayNext()
{
    DFPlayer_SendCommand(DFPLAYER_PLAY_NEXT, 0);
}

void DFPlayer_PlayPrev()
{
    DFPlayer_SendCommand(DFPLAYER_PLAY_PREV, 0);
}

void DFPlayer_PlaySpecific(uint16_t track)
{
    DFPlayer_SendCommand(DFPLAYER_PLAY_SPECIFIC, track);
}

void DFPlayer_VolumeUp()
{
    DFPlayer_SendCommand(DFPLAYER_VOLUME_UP, 0);
}

void DFPlayer_VolumeDown()
{
    DFPlayer_SendCommand(DFPLAYER_VOLUME_DOWN, 0);
}

void DFPlayer_SetVolume(uint8_t volume)
{
    if (volume > DFPLAYER_MAX_VOLUME)
    {
        volume = DFPLAYER_MAX_VOLUME;
    }

    DFPlayer_SendCommand(DFPLAYER_SET_VOLUME, volume);
}

void DFPlayer_SetEQ(uint8_t eq)
{
    DFPlayer_SendCommand(DFPLAYER_SET_EQ, eq);
}

void DFPlayer_LoopPlayback()
{
    DFPlayer_SendCommand(DFPLAYER_LOOP_PLAYBACK, 0);
}

void DFPlayer_StopPlayback()
{
    DFPlayer_SendCommand(DFPLAYER_STOP_PLAYBACK, 0);
}

int main(void)
{
    // Initialize GPIO and USART2
    GPIO_InitTypeDef GPIO_InitStruct;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    GPIO_InitStruct.GPIO_Pin = DFPLAYER_TX | DFPLAYER_RX;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);

    USART_InitStruct.USART_BaudRate = 9600;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    USART_Init(DFPLAYER_UART, &USART_InitStruct);

    USART_Cmd(DFPLAYER_UART, ENABLE);

    // Play audio files
    while (1)
    {
        DFPlayer_PlaySpecific(1); // Play track 1
        while (1); // Wait for playback to finish
        DFPlayer_PlayNext(); // Play next track
        while (1); // Wait for playback to finish
    }
}

此示例代码使用USART2与DFPlayer Mini模块进行通信，通过发送命令和参数的组合来控制音频播放。您需要根据您的硬件连接和DFPlayer Mini模块的手册来调整代码。