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UART STM32L0, Parity bit implementation

Question asked by ENEDIS.ibrahim on Jun 24, 2016
Latest reply on Jun 28, 2016 by ENEDIS.ibrahim
Hello,
I am setting up communication via USART2 Asynchronous to receive my data. Configuration for receive the data is 9600/7bit/1-bit stop/Parity Even/Mode Rx/Tx. The implementation works fine when no parity is implemented. But the specification dictates that even parity should be supported.

If added the parity, I received any value.I do not understand where is the problem.

My configuration is with STMCubeMx for STM32L031K6 nucleo. 

void MX_USART2_UART_Init(void)
    {
     
      huart2.Instance = USART2;
      huart2.Init.BaudRate = 9600;
      huart2.Init.WordLength = UART_WORDLENGTH_7B;
      huart2.Init.StopBits = UART_STOPBITS_1;
      huart2.Init.Parity = UART_PARITY_NONE;
      huart2.Init.Mode = UART_MODE_RX;
      huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
      huart2.Init.OverSampling = UART_OVERSAMPLING_16;
      huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
      huart2.AdvancedInit.AdvFeatureInit =    UART_ADVFEATURE_RXOVERRUNDISABLE_INIT|UART_ADVFEATURE_DMADISABLEONERROR_INIT;
      huart2.AdvancedInit.OverrunDisable = UART_ADVFEATURE_OVERRUN_DISABLE;
      huart2.AdvancedInit.DMADisableonRxError = UART_ADVFEATURE_DMA_DISABLEONRXERROR;
      if (HAL_UART_Init(&huart2) != HAL_OK)
      {
        Error_Handler();
      }
     
    }
     
    void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
    {
     
      GPIO_InitTypeDef GPIO_InitStruct;
      if(uartHandle->Instance==USART2)
      {
        /* Peripheral clock enable */
        __HAL_RCC_USART2_CLK_ENABLE();
       
        /**USART2 GPIO Configuration   
        PA9     ------> USART2_TX
        PA10     ------> USART2_RX
        */
        GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
        GPIO_InitStruct.Pull = GPIO_PULLUP;
        GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
        GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
     
        /* Peripheral interrupt init */
        HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
        HAL_NVIC_EnableIRQ(USART2_IRQn);
      }
    }
     
    void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
    {
     
      if(uartHandle->Instance==USART2)
      {
        /* Peripheral clock disable */
        __HAL_RCC_USART2_CLK_DISABLE();
       
        /**USART2 GPIO Configuration   
        PA9     ------> USART2_TX
        PA10     ------> USART2_RX
        */
        HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);
     
        /* Peripheral interrupt Deinit*/
        HAL_NVIC_DisableIRQ(USART2_IRQn);
     
      }
    }
 
void MX_GPIO_Init(void)
{
 
  GPIO_InitTypeDef GPIO_InitStruct;
 
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3, GPIO_PIN_RESET);
 
  /*Configure GPIO pin : PB3 */
  GPIO_InitStruct.Pin = GPIO_PIN_3;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
}
/*********************** interruption **********************/
 
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if (huart->Instance == USART2)  //current UART
        {  
            Receive();
            HAL_UART_Receive_IT(&huart2, Rx_data, 1);  
        }
}
 
/******************** Main ******************************/
int main(void)
{
  HW_Init();
  HAL_UART_Receive_IT(&huart2, Rx_data, 1);
  while (1)
  {
  }
}

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