[STM32F072] Problem in use all 4 UARTs in same time

[Metya]

I am creating a hub to connect several devices together. When I send a frame to one of the UARTs from an external device, I get an interrupt from each of the UARTs instead of just the one I sent to. what i am doing wrong?

I generated configuration in STM32CubeIDE.

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	if (huart->Instance == USART1)
	{
		HAL_UART_Receive_IT(&huart1, &rxBuffer[0], 1);
	}
	else if (huart->Instance == USART2)
	{
		HAL_UART_Receive_IT(&huart2, &rxBuffer[1], 1);
	}
	else if (huart->Instance == USART3)
	{
		HAL_UART_Receive_IT(&huart3, &rxBuffer[2], 1);
	}
	else if (huart->Instance == USART4)
	{
		HAL_UART_Receive_IT(&huart4, &rxBuffer[3], 1);
	}
}

[TDK]

> I get an interrupt from each of the UARTs instead of just the one I sent to.

How do you know? Prove what you're saying is correct.

[Tesla DeLorean]

Pretty sure nobody is going to be able to replicate your observation from the code provided.

The callback can only enter with a single instance, you'll need to look upstream for the issue, I'd start with the IRQHandlers.

I'd also do a better job of buffering/signalling I had data.

I expect the HW to function as designed, try a simpler implementation, without HAL. Prove the HW works, then fix the SW you're using.