strm32 idle 串口接收数据

### STM32 Idle Mode UART Receive Data Example For handling UART reception in idle mode on an STM32 microcontroller, a common approach involves configuring the USART to trigger interrupts specifically when it detects an idle line condition. This method allows for efficient management of incoming data packets separated by periods of inactivity. The provided code snippet demonstrates how to implement such functionality: ```c void USART1_IRQHandler(void) { uint16_t num; uint8_t buff[100]; if (USART_GetITStatus(USART1, USART_IT_IDLE) != RESET) { // Clear DR and SR registers after IDLE detection. USART1->DR; USART1->SR; // Retrieve received bytes into buffer up until last valid byte before IDLE state was entered. num = USART_GetReceiveData(USART1, buff, sizeof(buff)); // Process or send back buffered data as required. USART_SetSendData(USART1, buff, num); // Acknowledge interrupt flag corresponding to IDLE event. USART_ClearITPendingBit(USART1, USART_IT_IDLE); } } ``` This implementation ensures that once an idle period is detected between transmissions, all previously sent characters are read from the receiver shift register into `buff` array[^1]. To enhance this setup further especially concerning high-speed communications, integrating Direct Memory Access (DMA) can be beneficial. By doing so, continuous blocks of memory get automatically populated with incoming serial information without CPU intervention beyond initial configuration stages[^2]. Moreover, another critical aspect worth noting pertains to ensuring proper initialization settings within your project files where enabling specific flags like `USART_IT_IDLE` becomes necessary alongside setting appropriate baud rates among other parameters relevant to desired operation modes including power-saving ones[^3].