Research on the problem of ORE flag bit appearing in STM32 serial port-EEWORLD

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Test environment, STM32L476, when the HAL library uses UART, an ORE error occurs in the interrupt flag register, as described below:

Research on the problem of ORE flag appearing in STM32 serial port
Cause of code error:

1. Initialize the serial port, uart_USB_init(); this function does not start the interrupt

2. Delay 3000S, during which the computer sends data to the serial port every 50ms.

3. Start interrupt reception. HAL_NVIC_SetPriority(USART_IRQn, 5, 1);

HAL_NVIC_EnableIRQ(USART_IRQn);

4. An ORE error occurred.

After analysis, there may be two reasons. After the serial port is initialized, the serial port receives data (not processed), and then opens the interrupt to receive data again. Therefore, there is a difference between the two reception interrupt and non-interruption processing. It is also possible that the first non-interruption reception data is not processed.

Solution: Modify the above order

1. Delay 3000S, during which the computer sends data to the serial port every 50ms.

2. Initialize the serial port, uart_USB_init(); this function does not start the interrupt

3. Start interrupt reception. HAL_NVIC_SetPriority(USART_IRQn, 5, 1);

HAL_NVIC_EnableIRQ(USART_IRQn);

Specifically, serial port initialization and interrupt enable should be placed closely together.

Keywords：STM32 Reference address：Research on the problem of ORE flag bit appearing in STM32 serial port

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