基于STM32的数字音乐盒代码

基于STM32的数字音乐盒的代码主要包括以下几个部分：

1. 初始化部分：包括STM32的时钟配置、GPIO配置、外设配置等。

2. SD卡读取部分：包括SD卡初始化、文件读取、文件解码等。

3. DAC输出部分：包括DAC初始化、音频数据转换、DAC输出等。

4. 控制部分：包括按键扫描、遥控器控制、播放控制等。

以下是一个简单的基于STM32的数字音乐盒的代码示例：

#include "stm32f10x.h"
#include "ff.h"
#include "decode.h"
#include "key.h"
#include "rc522.h"

#define LED_PIN GPIO_Pin_13
#define LED_PORT GPIOC

FATFS fs;
FIL file;
FRESULT res;
DWORD bytesread;
char audio_buf[AUDIO_BUF_SIZE];
int audio_buf_size = 0;

void RCC_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
}

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);
}

void TIM_Configuration(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = 500 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 7200 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
    TIM_Cmd(TIM3, ENABLE);
}

void DAC_Configuration(void)
{
    DAC_InitTypeDef DAC_InitStructure;
    DAC_InitStructure.DAC_Trigger = DAC_Trigger_T3_TRGO;
    DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
    DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
    DAC_Init(DAC_Channel_1, &DAC_InitStructure);
    DAC_Cmd(DAC_Channel_1, ENABLE);
}

void SPI_Configuration(void)
{
    SPI_InitTypeDef SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_Init(SPI2, &SPI_InitStructure);
    SPI_Cmd(SPI2, ENABLE);
}

void SD_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SD_Error sd_res;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    sd_res = SD_Init();
    if (sd_res != SD_OK)
    {
        // SD卡初始化失败
    }
}

void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void EXTI_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource5);
    EXTI_InitStructure.EXTI_Line = EXTI_Line5;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);
}

int main(void)
{
    int i = 0;
    RCC_Configuration();
    GPIO_Configuration();
    NVIC_Configuration();
    EXTI_Configuration();
    TIM_Configuration();
    DAC_Configuration();
    SPI_Configuration();
    SD_Configuration();
    while (1)
    {
        if (audio_buf_size < AUDIO_BUF_SIZE)
        {
            res = f_read(&file, audio_buf + audio_buf_size, AUDIO_BUF_SIZE - audio_buf_size, &bytesread);
            if (res != FR_OK || bytesread == 0)
            {
                // 文件读取失败或已到文件末尾
            }
            audio_buf_size += bytesread;
        }
        if (audio_buf_size >= AUDIO_BUF_SIZE)
        {
            decode(audio_buf);
            audio_buf_size = 0;
        }
        if (i++ >= 100000)
        {
            i = 0;
            GPIO_WriteBit(LED_PORT, LED_PIN, !GPIO_ReadOutputDataBit(LED_PORT, LED_PIN));
        }
    }
}

void EXTI9_5_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line5) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line5);
        // 处理按键事件
    }
}

以上代码仅提供了一个简单的框架，具体实现还需要根据具体需求进行修改。