STM32无法进入DMA发送完成中断

//配置

void NVIC_Config(void){

NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

//NVIC_InitStructure.NVIC_IRQChannel=USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannel=DMA1_Channel5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;

NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;

NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&NVIC_InitStructure);    

}

void USART1_Config(void){

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOA, &GPIO_InitStructure); 

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

GPIO_Init(GPIOA, &GPIO_InitStructure);    

USART_InitStructure.USART_BaudRate = 115200;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_1;

USART_InitStructure.USART_Parity = USART_Parity_No ;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

USART_Init(USART1, &USART_InitStructure); 

USART_Cmd(USART1, ENABLE);

USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);

//USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

////USART_GetFlagStatus(USART1,USART_FLAG_TC);

}

void USART1_DMA_Config(void)

{

extern uint8_t RECEBuf;

extern uint8_t RECEBuf_Size;

DMA_InitTypeDef DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

DMA_DeInit(DMA1_Channel5);

DMA_InitStructure.DMA_PeripheralBaseAddr=0x40013804;

DMA_InitStructure.DMA_MemoryBaseAddr=(uint8_t)RECEBuf;

DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize=RECEBuf_Size;

DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;

DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte;

DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Byte;

DMA_InitStructure.DMA_Mode=DMA_Mode_Normal;

DMA_InitStructure.DMA_Priority=DMA_Priority_VeryHigh;

DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;

DMA_Init(DMA1_Channel5,&DMA_InitStructure);

DMA_Cmd(DMA1_Channel5,ENABLE);

DMA_ITConfig(DMA1_Channel5,DMA_IT_TC,ENABLE);

}

//中断处理

void DMA1_Channel5_IRQHandler(void)

{

    printf("c");

    if(DMA_GetFlagStatus(DMA1_IT_TC5))

        {

//        a=0;

        uint8_t data;

        DMA_ClearITPendingBit(DMA1_IT_GL5);

            data=DMA_GetCurrDataCounter(DMA1_Channel5);

        DMA_Cmd(DMA1_Channel5,DISABLE);

    DMA_SetCurrDataCounter(DMA1_Channel5,8);

    DMA_Cmd(DMA1_Channel5,ENABLE);

            printf("%d",data);

        printf("%d",RECEBuf[0]);

        }

}