HAL_UART_Receive_IT returns error

[duybienle]

Posted on August 04, 2016 at 09:48

Hi, I want to transmit something from PC to uC and I put UART in receive mode. However HAL_UART_Receive_IT keeps returning error, and I don't know why?

My code is really simple:

int main(void)

{/* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); SystemClock_Config(); MX_GPIO_Init(); MX_USART2_UART_Init(); while (1) { uartStatus = HAL_UART_Receive_IT(&huart2, (uint8_t *)aRxBuffer, 10); if(uartStatus != HAL_OK) { Error_Handler(); } } }

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)

{ /* Set transmission flag: transfer complete */ } I let the code rund and did not send anything from PC. After a few loop cycles, the uartStatus becomes BUSY and error_handle() occurs. How to solve this problem ? Thanks Bien

[Walid FTITI_O]

Posted on August 22, 2016 at 13:16

Hi Le.bien,

It seems you have an overrun error due to pending interrupt.

In order to clear the pending interrupts we provide a specific macros in stm32f4xx_hal_uart.h file that can be used directly by the application (when needed).

Please refer to the Exported macro section in stm32f4xx_hal_uart.h file. The specific macro to clear the overrun pending interrupt is

__HAL_UART_CLEAR_OREFLAG()

Thus you can perform this to avoid overrun issue:

__HAL_UART_CLEAR_OREFLAG(…)
HAL_UART_Receive_IT(…)

-Hannibal-