STM32F103 DMA+空闲中断接收不固定长度资料问题

只看该作者 · 2021-11-18 10:43

STM32F103C8T6单晶片，使用USART1+DMA接收资料，RX
DMA_BufferSize设定为30 bytes，当接收长度<30 bytes，进USART1_IRQHandler(void)的空闲中断，但当资料长度=30 bytes时，会先进DMA1_Channel5_IRQHandler(void)的DMA 传输缓冲完成中断，然後再进USART1_IRQHandler(void)的空闲中断，想请问当资料长度=DMA_BufferSize时，如何不要进空闲中断，谢谢!

void RCC_Configuration(void)
{
         RCC_APB2PeriphclockCmd(RCC_APB2Periph_GPIOA| RCC_APB2Periph_USART1 ,ENABLE);
         RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
}

void GPIO_Configuration(void)
{
         GPIO_InitTypeDefGPIO_InitStructure;

         GPIO_DeInit(GPIOA);
         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;                                                                         //TX
         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;                                                                            //RX
         GPIO_InitStructure.GPIO_Mode= GPIO_Mode_IN_FLOATING;
         GPIO_InitStructure.GPIO_Speed= GPIO_Speed_50MHz;
         GPIO_Init(GPIOA,&GPIO_InitStructure);
}

void USART_Configuration(void)
{
         USART_InitTypeDefUSART_InitStructure;

         USART_DeInit(USART1);
         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_ITConfig(USART1,USART_IT_IDLE,ENABLE);
}

void DMA_Configuration(void)
{
         DMA_InitTypeDefDMA_InitStructure;

         DMA_DeInit(DMA1_Channel4);
         DMA_InitStructure.DMA_PeripheralBaseAddr= (uint32_t)(&USART1->DR);
         DMA_InitStructure.DMA_MemoryBaseAddr= (uint32_t)TxBuffer;
         DMA_InitStructure.DMA_DIR= DMA_DIR_PeripheralDST;
         DMA_InitStructure.DMA_BufferSize= 256;
         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_Channel4,&DMA_InitStructure);
         DMA_Cmd(DMA1_Channel4,ENABLE);
         DMA_ITConfig(DMA1_Channel4,DMA_IT_TC| DMA_IT_TE,ENABLE);

         DMA_DeInit(DMA1_Channel5);
         DMA_InitStructure.DMA_PeripheralBaseAddr= (uint32_t)(&USART1->DR);
         DMA_InitStructure.DMA_MemoryBaseAddr= (uint32_t)RxBuffer;
         DMA_InitStructure.DMA_DIR= DMA_DIR_PeripheralSRC;
         DMA_InitStructure.DMA_BufferSize= 30;
         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_PeripheralDataSize_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| DMA_IT_TE,ENABLE);
}

void NVIC_Configuration(void)
{
         NVIC_InitTypeDefNVIC_InitStructure;

         NVIC_InitStructure.NVIC_IRQChannel= USART1_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 2;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority= 0;
         NVIC_InitStructure.NVIC_IRQChannelCmd= ENABLE;
         NVIC_Init(&NVIC_InitStructure);

         NVIC_InitStructure.NVIC_IRQChannel= DMA1_Channel4_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 1;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority= 0;
         NVIC_InitStructure.NVIC_IRQChannelCmd= ENABLE;
         NVIC_Init(&NVIC_InitStructure);

         NVIC_InitStructure.NVIC_IRQChannel= DMA1_Channel5_IRQn;
         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority= 0;
         NVIC_InitStructure.NVIC_IRQChannelSubPriority= 0;
         NVIC_InitStructure.NVIC_IRQChannelCmd= ENABLE;
         NVIC_Init(&NVIC_InitStructure);
}

void USART1_IRQHandler(void)
{
         uint8_t clear;
         if(USART_GetITStatus(USART1,USART_IT_IDLE)!=RESET)                         // forUSART_IT_IDLE
         {
                  clear  = USART1->SR;                                                                                        //clear IT_IDLE
                  clear  = USART1->DR;
                  data_len = 30- DMA_GetCurrDataCounter(DMA1_Channel5);
                  DMA_Cmd(DMA1_Channel5,DISABLE);
                  DMA_SetCurrDataCounter(DMA1_Channel5,30);
                  DMA_Cmd(DMA1_Channel5,ENABLE);
         }
}

void DMA1_Channel4_IRQHandler(void)
{
         if(DMA_GetITStatus(DMA1_FLAG_TC4)!= RESET)                                                 //for DMA_IT_TC
         {
                  DMA_ClearITPendingBit(DMA1_IT_TC4);
         }
}

void DMA1_Channel5_IRQHandler(void)
{
         if(DMA_GetITStatus(DMA1_IT_TC5)!= RESET)                                           //for DMA_IT_TC
         {
                  DMA_ClearITPendingBit(DMA1_IT_TC5);
                  DMA_Cmd(DMA1_Channel5,DISABLE);
                  DMA_SetCurrDataCounter(DMA1_Channel5,30);
                  DMA_Cmd(DMA1_Channel5,ENABLE);
         }
}