STM32L4 Serial Overrun error Interrupt flags clear

[huarunlin]

When I debugged the STM32L496vg, I found that the serial overrun error interrupt flag clearing process is inconsistent with the st reference manual

mbed-os/targets/TARGET_STM/TARGET_STM32L4/serial_device.c

Lines 60 to 64 in 91b793c

	if (__HAL_UART_GET_FLAG(huart, UART_FLAG_ORE) != RESET) {
	if (__HAL_UART_GET_IT(huart, UART_IT_ORE) != RESET) {
	volatile uint32_t tmpval __attribute__((unused)) = huart->Instance->RDR; // Clear ORE flag
	}
	}

ST RM0351 Reference manual:

[mbedmain]

@huarunlin thank you for raising this issue.Please take a look at the following comments:

Could you add some more detail to the description? A good description should be at least 25 words.
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[jeromecoutant]

Hi
For history, code seems quite old since #5962

@huarunlin do you find a correction ?

[jeromecoutant]

Myabe you can check #14925 discussion ?