44 lines
822 B
Markdown
44 lines
822 B
Markdown
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---
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title: 串口DMA不定长接收
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updated: 2022-01-11 01:27:13Z
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created: 2022-01-08 13:18:08Z
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tags:
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- mcu
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- 串口
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- 代码块
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---
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串口不定长接收利用的是串口接收中的空闲中断
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处理空闲中断
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```c
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/**
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* @brief This function handles USART1 global interrupt.
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*/
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void USART1_IRQHandler(void)
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{
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/* USER CODE BEGIN USART1_IRQn 0 */
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uint32_t flag,tmp;
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flag = __HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE);
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if (flag != RESET) {
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__HAL_UART_CLEAR_IDLEFLAG(&huart1);
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tmp = huart1.Instance->SR;
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tmp = huart1.Instance->DR;
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HAL_UART_DMAStop(&huart1);
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tmp = hdma_usart1_rx.Instance->CNDTR;
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rxlen = 200 - tmp;
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isrxend = 1;
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}
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/* USER CODE END USART1_IRQn 0 */
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HAL_UART_IRQHandler(&huart1);
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/* USER CODE BEGIN USART1_IRQn 1 */
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/* USER CODE END USART1_IRQn 1 */
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}
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</div>
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```
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#串口
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#mcu
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#代码块
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