主程序40多秒我笑了，楼主是要换个思路

撸主这个是程序架构没搭建好，花一个星期去搭建架构吧，架构这东西可能要尝试过几个才知道哪个是最科学的，别人老手可能一天时间搭的架构都比你一个星期弄的要好。
不过一弄好了你在这个类型的产品都可以一劳永逸了。磨刀不误砍柴功，架构就相当于你的刀。
  以lz目前的状况，不易上系统，搞个状态机就ok了，

蜗牛蜗牛 发表于 2017-8-12 08:52
主循环时间太长,最短40秒,最长时候1分40秒,所以想到用定时器,结果死机了狗也不管用 ...

直接在这段执行40秒或100秒的代码中插入清看门狗的语句不就行了嘛，你不要说在这个地方插不进去……以上是应急的方法。
估计要你重写架构也会勉为其难的，目前还是凑合着，修修补补用着吧。

主程序架构有问题，播放音乐不需要死等，可以用定时中断

#include "bsp_audio.h"
#include "string.h"

#define BSP_AUDIO_DMA_BUFFER_SIZE     512

static CBREAD readfile;
static void *filehandle;
static u8 isplaying = 0;
static u8 buffer[BSP_AUDIO_DMA_BUFFER_SIZE];

#define DAC_DHR8R1_ADDRESS     0x40007410

void bsp_audio_init(u16 sr)
{
    GPIO_InitTypeDef            GPIO_InitStructure;
    DMA_InitTypeDef             DMA_InitStructure;
    TIM_TimeBaseInitTypeDef     TIM_TimeBaseStructure;
    DAC_InitTypeDef             DAC_InitStructure;
    NVIC_InitTypeDef            NVIC_InitStructure;
   
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//AMP ShutDown
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
   
    TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
    TIM_TimeBaseStructure.TIM_Period = 90000000 / sr;
    TIM_TimeBaseStructure.TIM_Prescaler = 0;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);

    TIM_DMACmd(TIM4, TIM_DMA_Update, ENABLE);
   
    DAC_DeInit();
   
    DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
    DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;
    DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;
    DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_TriangleAmplitude_1023;
    DAC_Init(DAC_Channel_1, &DAC_InitStructure);
   
    DAC_Cmd(DAC_Channel_1, ENABLE);

    //DAC_DMACmd(DAC_Channel_1, ENABLE);
   
    DMA_DeInit(DMA1_Stream6);
    DMA_InitStructure.DMA_Channel = DMA_Channel_2;  
    DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR8R1_ADDRESS;
    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&buffer;
    DMA_InitStructure.DMA_BufferSize = BSP_AUDIO_DMA_BUFFER_SIZE;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA1_Stream6, &DMA_InitStructure);
   
    DMA_ITConfig(DMA1_Stream6, DMA_IT_TC | DMA_IT_HT, ENABLE);
   
    DMA_Cmd(DMA1_Stream6, ENABLE);
   
    NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream6_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}
u8 bsp_audio_isbusy(void)
{
    return isplaying;
}
void bsp_audio_start(CBREAD read, void *phandle)
{
    u32 readlen;
    if(isplaying == 1)
    {
        return;
    }
    readfile = read;
    filehandle = phandle;
    readlen = readfile(filehandle, buffer, BSP_AUDIO_DMA_BUFFER_SIZE);

    if(readlen == 0)
    {
        return;
    }
    TIM_Cmd(TIM4, ENABLE);
    AUDIO_AMP_ON;
    isplaying = 1;
}

void bsp_audio_stop(void)
{
    TIM_Cmd(TIM4, DISABLE);
    memset(buffer, 0x80, sizeof(buffer));
    isplaying = 0;
    AUDIO_AMP_OFF;
}

void DMA1_Stream6_IRQHandler(void)
{
    u32 readlen;
    if(DMA_GetITStatus(DMA1_Stream6, DMA_IT_HTIF6) == SET)
    {
        readlen = readfile(filehandle, buffer, BSP_AUDIO_DMA_BUFFER_SIZE / 2);
        if(readlen == 0)
        {
            bsp_audio_stop();
        }
    }
    else if(DMA_GetITStatus(DMA1_Stream6, DMA_IT_TCIF6) == SET)
    {
        readlen = readfile(filehandle, buffer + BSP_AUDIO_DMA_BUFFER_SIZE / 2, BSP_AUDIO_DMA_BUFFER_SIZE / 2);
        if(readlen == 0)
        {
            bsp_audio_stop();
        }
    }
    DMA_ClearITPendingBit(DMA1_Stream6, DMA_IT_TCIF6 | DMA_IT_HTIF6);
}