usart3 on nucleo-h753 not work fine

[yogui_ricardo]

I have been trying to transmit and receive from putty through the USB virtual com (CN1) of the core board, I tried with different baud rates and the result is always the same, garbage arrives at the putty, and I am not receiving anything either, it is my configuration and tks in advance =  

static void MX_USART3_UART_Init(void)

{ huart3.Instance = USART3;

huart3.Init.BaudRate = 115200;

huart3.Init.WordLength = UART_WORDLENGTH_8B;

huart3.Init.StopBits = UART_STOPBITS_1;

huart3.Init.Parity = UART_PARITY_NONE;

huart3.Init.Mode = UART_MODE_TX_RX;

huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;

huart3.Init.OverSampling = UART_OVERSAMPLING_16;

huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;

huart3.Init.ClockPrescaler = UART_PRESCALER_DIV1;

huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_MSBFIRST_INIT;

huart3.AdvancedInit.MSBFirst = UART_ADVFEATURE_MSBFIRST_ENABLE;

if (HAL_UART_Init(&huart3) != HAL_OK)

{

Error_Handler();

}

if (HAL_UARTEx_SetTxFifoThreshold(&huart3, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)

{

Error_Handler();

}

if (HAL_UARTEx_SetRxFifoThreshold(&huart3, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)

{

Error_Handler();

}

if (HAL_UARTEx_DisableFifoMode(&huart3) != HAL_OK)

{

Error_Handler();

}

}

Call to send

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) //

{

if(htim->Instance == TIM1)

{

cada2segundos();

}

}

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) {

if (huart->Instance == USART3) {

HAL_GPIO_TogglePin(GPIOB, LD1_Pin);

}

}

void cada2segundos(void)

{

HAL_GPIO_TogglePin(GPIOE, LD2_Pin);// ambar

HAL_UART_Receive_DMA(&huart3, rx_buffer,RX_BUFFER_SIZE);

uint8_t mensaje[] = "Hola de nuevo";

HAL_UART_Transmit_IT(&huart3, mensaje, sizeof(mensaje) - 1);

}

[Tesla DeLorean]

Show the MSP code that initializes the clocks and the GPIOs

NUCLEO-H753ZI

Should be using USART3 PD8 / PD9 provided SB12 and SB19 are intact

Serial is typically LSB first!!

huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_MSBFIRST_INIT; // ??

[SofLit]

Hello and welcome to the community.

First I suggest you to read these recommandations about how to pot a thread on this community: https://community.st.com/t5/community-guidelines/how-to-write-your-question-to-maximize-your-chances-to-find-a/ta-p/575228

Secont I'm wondering why are you using a timer to send your string at this level? What about the periodicity of the timer IT?

Did you try to send the string once? I suggest you to inspire from this "printf" example over UART: https://github.com/STMicroelectronics/STM32CubeH7/tree/master/Projects/STM32H743I-EVAL/Examples/UART/UART_Printf

[Tesla DeLorean]

//****************************************************************************

void USART3_Init(uint32_t BaudRate) // TX/RX VCP NUCLEO-H753ZI
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  UART_HandleTypeDef UartHandle = {0};

  __USART3_CLK_ENABLE();
  __GPIOD_CLK_ENABLE();

  /* UART RX/TX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = GPIO_PIN_8 | GPIO_PIN_9;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_HIGH;
  GPIO_InitStruct.Alternate = GPIO_AF7_USART3;

  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

  /*## Configure the UART peripheral ######################################*/
  /* Put the USART peripheral in the Asynchronous mode (UART Mode) */
  /* USART3 configured as follow:
      - Word Length = 8 Bits
      - Stop Bit = One Stop bit
      - Parity = NO parity
      - BaudRate = 115200 baud
      - Hardware flow control disabled (RTS and CTS signals) */
  UartHandle.Instance        = USART3;

  UartHandle.Init.BaudRate   = BaudRate;
  UartHandle.Init.WordLength = UART_WORDLENGTH_8B;
  UartHandle.Init.StopBits   = UART_STOPBITS_1;
  UartHandle.Init.Parity     = UART_PARITY_NONE;
  UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
  UartHandle.Init.Mode       = UART_MODE_TX_RX;

  UartHandle.Init.OverSampling   = UART_OVERSAMPLING_16;
#ifdef UART_ONE_BIT_SAMPLE_DISABLE
  UartHandle.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
#endif

  if (HAL_UART_Init(&UartHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  HAL_NVIC_SetPriority(USART3_IRQn, 1, 0);
  HAL_NVIC_EnableIRQ(USART3_IRQn);
}

//****************************************************************************

[yogui_ricardo · Accepted solution]

The problem was the clock configuration, I had done some tests with the callback at different mhz.

Tks  (i´m new in stm32 family)