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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); } } 
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5个回答
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FPGA 开发十五年开发经验
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2021-10-20 10:27:30
评论
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把DMA发送中断关了，只用串口的空闲中断
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我者是抄空闲中断来接收，效果还好，可以私聊我送你代码！
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