Stm32F103 uart2 with STM32Cube Mx

Posted on September 01, 2016 at 13:22

Hi, I am using a nucleo - F103RB board for testing its UART. I am using the STM32Cube Mx to generate the codes for the start. I can successfully generate working codes for Usart1 and it can successfully transmit and receive using the HAL library. But when I generate codes for Usart2 using the STM32Cube, I can no longer transmit or receive any data. Does the STM32cube not generate all the required codes for USART2? I am quite new to this so please explain why USART1 is different than USART2 in this case.

here is the auto generated code for the USART2

void MX_USART2_UART_Init(void)

{

  huart2.Instance = USART2;

  huart2.Init.BaudRate = 115200;

  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;

  if (HAL_UART_Init(&huart2) != HAL_OK)

  {

    Error_Handler();

  }

}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)

{

  GPIO_InitTypeDef GPIO_InitStruct;

  if(uartHandle->Instance==USART2)

  {

  /* USER CODE BEGIN USART2_MspInit 0 */

  /* USER CODE END USART2_MspInit 0 */

    /* Peripheral clock enable */

    __HAL_RCC_USART2_CLK_ENABLE();

 

    /**USART2 GPIO Configuration    

    PA2     ------> USART2_TX

    PA3     ------> USART2_RX

    */

    GPIO_InitStruct.Pin = GPIO_PIN_2;

    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;

    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_3;

    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;

    GPIO_InitStruct.Pull = GPIO_NOPULL;

    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* Peripheral DMA init*/

 

    hdma_usart2_rx.Instance = DMA1_Channel6;

    hdma_usart2_rx.Init.Direction = DMA_PERIPH_TO_MEMORY;

    hdma_usart2_rx.Init.PeriphInc = DMA_PINC_DISABLE;

    hdma_usart2_rx.Init.MemInc = DMA_MINC_ENABLE;

    hdma_usart2_rx.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;

    hdma_usart2_rx.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;

    hdma_usart2_rx.Init.Mode = DMA_CIRCULAR;

    hdma_usart2_rx.Init.Priority = DMA_PRIORITY_LOW;

    if (HAL_DMA_Init(&hdma_usart2_rx) != HAL_OK)

    {

      Error_Handler();

    }

    __HAL_LINKDMA(uartHandle,hdmarx,hdma_usart2_rx);

    /* Peripheral interrupt init */

    HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);

    HAL_NVIC_EnableIRQ(USART2_IRQn);

  /* USER CODE BEGIN USART2_MspInit 1 */

  /* USER CODE END USART2_MspInit 1 */

  }

}

#usart2 #stm32f10