stm32F407VET6串口三接收中断代码

### STM32F407VET6 UART3 接收中断代码示例 对于STM32F407VET6单片机，在实现UART3接收中断功能时，需要初始化USART外设并配置相应的NVIC中断优先级。由于该芯片使用了4位中断优先级[^2]，因此在配置过程中需要注意这一点。 #### 初始化和使能UART3接收中断 ```c #include "stm32f4xx_hal.h" UART_HandleTypeDef huart3; void MX_USART3_UART_Init(void) { huart3.Instance = USART3; huart3.Init.BaudRate = 9600; huart3.Init.WordLength = UART_WORDLENGTH_8B; huart3.Init.StopBits = UART_STOPBITS_1; huart3.Init.Parity = UART_PARITY_NONE; huart3.Init.Mode = UART_MODE_TX_RX; huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart3.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart3) != HAL_OK) { Error_Handler(); } } // 配置中断优先级 void SystemClock_Config(void) { __HAL_RCC_GPIOA_CLK_ENABLE(); // Enable GPIOA clock for USART3 TX/RX pins /* Configure the NVIC attributes */ HAL_NVIC_SetPriority(USART3_IRQn, 5, 0); // 设置USART3中断优先级为5 HAL_NVIC_EnableIRQ(USART3_IRQn); } ``` 上述代码片段展示了如何初始化USART3以及配置其中断优先级。通过`HAL_NVIC_SetPriority()`函数设置了USART3的中断优先级，并启用了对应的中断请求。 #### 实现UART3接收中断服务程序 当接收到数据时会触发此ISR（Interrupt Service Routine），可以在里面读取接收到的数据： ```c uint8_t received_data; void USART3_IRQHandler(void) { /* Check whether the interrupt is triggered by IDLE line detection or RXNE flag */ if (__HAL_UART_GET_FLAG(&huart3, UART_FLAG_IDLE)) { uint16_t temp; // Clear Idle Line Detection Flag and read data from DR register to clear RXNE flag. temp = huart3.Instance->RDR; __HAL_UART_CLEAR_IDLEFLAG(&huart3); // Process your received byte here received_data = (uint8_t)(temp & 0xFF); // Optionally handle end of frame logic... } else if(__HAL_UART_GET_FLAG(&huart3, UART_FLAG_RXNE)){ // Read a single character when there's new incoming data available received_data = (uint8_t)huart3.Instance->DR; // Add processing code after receiving each byte as needed } } ``` 这段代码实现了基本的UART3接收中断处理逻辑，能够检测到新字符到达并通过读取寄存器获取这些字符。注意这里还包含了对空闲线状态(IDLE)的支持，这有助于识别帧边界。