SPI+DMA奇怪问题

lhda1

void SPI1_DMA_32B(unsigned char *p)
{
    DMA_InitTypeDef DMA_InitStructure;
    DMA_DeInit(DMA1_Channel3);
    DMA_Cmd(DMA1_Channel3, DISABLE);
    SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Tx, ENABLE);   
    DMA_ClearFlag(DMA1_FLAG_TC3 | DMA1_FLAG_TE3 | DMA1_FLAG_HT3 | DMA1_FLAG_GL3);
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI1->DR;  //外设地址，spi1
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)p;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;   
    DMA_InitStructure.DMA_BufferSize = 8; 
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//使能外设地址不自增
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;      //使能存储目标地址自增
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; 
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;   
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;               //不循环
    DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;     //通道优先级高
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;             //非存储器至存储器模式
    DMA_Init(DMA1_Channel3, &DMA_InitStructure);
             
    DMA_Cmd(DMA1_Channel3, ENABLE);   
}


void vs1053test()
{
//    unsigned char i;
    unsigned char a[8]={0x53,0xef,0x6e,0x44,0,0,0,0};
    unsigned char b[8]={0x45,0x78,0x69,0x74,0,0,0,0};
    xdcs=0;
    while(dq==0) ;

    SPI1_DMA_32B(a);
    while(dq==0) ;
    delay_ms(1860);

    SPI1->DR;
    SPI1_DMA_32B(b);
    xdcs=1;
    while(1);
}
用JTAG调试时，两段数组都能发送出去，运行时却只发送了第一组。。求大神解

lhda1

upup