CubeMX HAL_USART_Receive_IT returning always Noise Error

[eperis]

Posted on February 28, 2015 at 09:18

I have checked the demo in:

STM32Cube_FW_F4_V1.3.0\Projects\STM32F4-Discovery\Examples\UART\UART_TwoBoards_ComIT I setup same configuration following STM32CubeMX and I can Tx but I can't Rx. Instead of callingHAL_UART_RxCpltCallback() on reception it callsHAL_UART_ErrorCallback(). A quick look to the UartHandle->ErrorCode reveals I am getting HAL_UART_ERROR_NE. However if I go step-by-step on theHAL_UART_IRQHandler() I can see that the Demo code enters this condition:

tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_RXNE);
tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_RXNE);
/* UART in mode Receiver ---------------------------------------------------*/
if
((tmp1 != RESET) && (tmp2 != RESET))
{ 
UART_Receive_IT(huart);
}

But when executing my code it enters this one instead:

tmp1 = __HAL_UART_GET_FLAG(huart, UART_FLAG_TXE);
tmp2 = __HAL_UART_GET_IT_SOURCE(huart, UART_IT_TXE);
/* UART in mode Transmitter ------------------------------------------------*/
if
((tmp1 != RESET) && (tmp2 != RESET))
{
UART_Transmit_IT(huart);
}

I even tried changing the configuration mode fromUART_MODE_TX_RX to onlyUART_MODE_RX, but the result is the same. I am not sending anything and I am only calling the function (which always lights up the blue LED):

if
(HAL_UART_Receive_IT(&huart2, (uint8_t *)aRxBuffer, 2)!= HAL_OK){
HAL_GPIO_TogglePin(GPIOD, LED_ORANGE);
} 
else
{
HAL_GPIO_TogglePin(GPIOD, LED_BLUE);
}

But as soon as a character is received through the port I get the error. The configuration is as follows:

/** System Clock Configuration
*/
void
SystemClock_Config(
void
)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
__PWR_CLK_ENABLE();
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = 6;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
}
/* USART2 init function */
void
MX_USART2_UART_Init(
void
)
{
huart2.Instance = USART2;
huart2.Init.BaudRate = 9600;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
HAL_UART_Init(&huart2);
}
void
MX_GPIO_Init(
void
)
{
GPIO_InitTypeDef GPIO_InitStruct;
/* GPIO Ports Clock Enable */
__GPIOA_CLK_ENABLE();
__GPIOD_CLK_ENABLE();
/*Configure GPIO pins : PD12 PD13 PD14 PD15 */
GPIO_InitStruct.Pin = GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
}

Main program:

int
main(
void
)
{ 
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
if
(HAL_UART_Receive_IT(&huart2, (uint8_t *)aRxBuffer, 2)!= HAL_OK){
HAL_GPIO_TogglePin(GPIOD, LED_ORANGE);
} 
else
{
HAL_GPIO_TogglePin(GPIOD, LED_BLUE); 
//BLUE
}
while
(1)
{
}
}

void
HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)
{
HAL_GPIO_TogglePin(GPIOD, LED_GREEN); 
//Got it
}
void
HAL_UART_ErrorCallback(UART_HandleTypeDef *UartHandle)
{
/* Turn LED3 on: Transfer error in reception/transmission process */
HAL_GPIO_TogglePin(GPIOD, LED_RED); 
//Error
}

The reception works fine when using blocking mode HAL_UART_Receive(), but not when using HAL_UART_Receive_IT(). #stm32 #usart #discovery #stm32f4