stm32103串口+DMA+空闲中断 hal

### STM32F103 HAL UART DMA Idle Interrupt Example Code For implementing UART communication with DMA and handling idle interrupts on an STM32F103 using the HAL library, one can refer to specific configurations that ensure proper setup of both hardware components as well as software handlers. #### Initialization Configuration The initialization process involves configuring the UART peripheral along with its associated DMA channel. For instance, when utilizing USART2 alongside DMA for data reception, it's crucial to set up the correct DMA stream based on the microcontroller’s datasheet specifications[^1]. In this case, `USART2` uses `DMA1_Channel6`. ```c UART_HandleTypeDef huart2; DMA_HandleTypeDef hdma_usart2_rx; void MX_USART2_UART_Init(void) { huart2.Instance = USART2; huart2.Init.BaudRate = 115200; huart2.Init.WordLength = UART_WORDLENGTH_8B; huart2.Init.StopBits = UART_STOPBITS_1; huart2.Init.Parity = UART_PARITY_NONE; huart2.Init.Mode = UART_MODE_TX_RX; huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart2.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart2) != HAL_OK) { Error_Handler(); } } void MX_DMA_Init(void) { __HAL_RCC_DMA1_CLK_ENABLE(); hdma_usart2_rx.Instance = DMA1_Channel6; hdma_usart2_rx.Init.Direction = DMA_PERIPH_TO_MEMORY; hdma_usart2_rx.Init.PeriphInc = DMA_PINC_DISABLE; hdma_usart2_rx.Init.MemInc = DMA_MINC_ENABLE; hdma_usart2_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE; hdma_usart2_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE; hdma_usart2_rx.Init.Mode = DMA_CIRCULAR; hdma_usart2_rx.Init.Priority = DMA_PRIORITY_HIGH; if (HAL_DMA_Init(&hdma_usart2_rx) != HAL_OK) { Error_Handler(); } __HAL_LINKDMA(&huart2, hdmarx, hdma_usart2_rx); } ``` #### Handling Idle Line Detection To handle the idle line detection effectively, configure the UART to generate an interrupt upon detecting an idle line condition. This allows applications to know when a complete frame has been received over UART without additional stop bits being detected between frames. ```c static uint8_t rxBuffer[64]; uint8_t *pRxData = NULL; volatile size_t RxSize = 0; void HAL_UARTEx_RxCpltCallback(UART_HandleTypeDef *huart) { if(huart->Instance==USART2){ pRxData = &rxBuffer[RxSize]; // Point to next position in buffer RxSize += strlen((char*)pRxData); // Update total bytes read /* Process Received Data Here */ // Restart receiving after processing current chunk HAL_UART_Receive_IT(&huart2, (uint8_t *)pRxData, sizeof(rxBuffer)); } } void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart) { if (__HAL_UART_GET_FLAG(huart, UART_FLAG_IDLE)) { __HAL_UART_CLEAR_IDLEFLAG(huart); // Handle end-of-frame here or trigger further actions. // Optionally restart continuous receive operation. HAL_UART_Receive_DMA(&huart2, rxBuffer, sizeof(rxBuffer)); } } ``` This configuration ensures seamless integration of UART communication with DMA transfers while also managing idle line detections through appropriate callback functions. The provided snippets illustrate how these elements come together within an application built around the STM32 HAL libraries.