UART4用DMA2传递数据，DMA2进不了中断

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void Uart4Init(void){//





USART_InitTypeDef USART_InitStructure;

USART_ClockInitTypeDef USART_ClockInitStruct;

DMA_InitTypeDef DMA_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;



RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);//使能DMA时钟 

RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4 , ENABLE); //使能串口时钟



// *****************************************

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel4_5_IRQn;//; DMA2_Channel5_IRQn

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVIC_PriorityGroup_4;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure); 



/* UART4 configured as follow:*/





USART_InitStructure.USART_BaudRate = 115200;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;

USART_InitStructure.USART_StopBits = USART_StopBits_2;

USART_InitStructure.USART_Parity = USART_Parity_No ;

USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_InitStructure.USART_Mode = USART_Mode_Tx;//USART_Mode_Tx|USART_Mode_Rx;

USART_ClockInitStruct.USART_Clock = USART_Clock_Disable; 

USART_ClockInitStruct.USART_CPOL = USART_CPOL_Low; 

USART_ClockInitStruct.USART_CPHA = USART_CPHA_2Edge; 

USART_ClockInitStruct.USART_LastBit = USART_LastBit_Disable; 



USART_Init(UART4, &USART_InitStructure);





USART_ITConfig(UART4, USART_IT_TXE, DISABLE); 

//--------

USART_DMACmd(UART4,USART_DMAReq_Tx,ENABLE);



//----------------- 





/* DMA channel1 configuration ----------------------------------------------*/

//DMA_DeInit(DMA2_Channel5);

DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&UART4->DR); //外设地址

DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&artnet_dmxUniverse[send_buffer[3]-1];//内存地址

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;//DMA_DIR_PeripheralSRC;//DMA 传输方向

DMA_InitStructure.DMA_BufferSize = 100;

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_Mode_Circular; :设置DMA的传输模式：连续不断的循环模式. DMA_Mode_Normal:这里是普通模式，即传输完成后就关闭了DMA 

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA2_Channel5, &DMA_InitStructure);





DMA_ITConfig(DMA2_Channel5, DMA_IT_TC, ENABLE); //使能DMA 中断

USART_Cmd(UART4, ENABLE); // Enable USART1 

DMA_Cmd(DMA2_Channel5, ENABLE); //使能通道1 



}





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void DMA2_Channel4_5_IRQHandler(void)



{

/* Test on DMA Channel1 Transfer Complete interrupt */

if(DMA_GetITStatus(DMA2_IT_TC5))

{



DMA_ClearITPendingBit(DMA2_IT_GL5);





USART_DMACmd(UART4,USART_DMAReq_Tx,DISABLE);

USART_ITConfig(UART4, USART_IT_TXE, DISABLE);





DMA_ITConfig(DMA2_Channel5, DMA_IT_TC, DISABLE); //

DMA_Cmd(DMA2_Channel5, DISABLE); //



TxState = STOPED; 

}