Can't get any interrupt when receive frame

Hi,

i've this strange behaviour and I can't figure it out why.

I've already used this library before and so I can't understand why I've so many trouble now, but basically I can't receive any interrupt when receiving a Modbus frame from the master.

I've configured my device as a slave with the following parameters:

/* Modbus Slave initialization */
modH->uModbusType = MB_SLAVE;
modH->port =  &huart3; // This is the UART port connected to STLINK in the discovery F429
modH->u8id = 1; //Master ID
modH->u16timeOut = 1000;
modH->EN_Port = UART3_TX_EN_GPIO_Port; // RS485 Enable
modH->EN_Pin = UART3_TX_EN_Pin; // RS485 Enable
modH->u16regs = ModbusDATARX;
modH->u16regsize= sizeof(ModbusDATARX)/sizeof(ModbusDATARX[0]);
modH->xTypeHW = USART_HW;

My GPIOs are set in this way:

GPIO_InitStruct.Pin = UART3_TX_EN_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

GPIO_InitStruct.Pin = UART3_RX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_UART3;
HAL_GPIO_Init(UART3_RX_GPIO_Port, &GPIO_InitStruct);

GPIO_InitStruct.Pin = UART3_TX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_UART3;
HAL_GPIO_Init(UART3_TX_GPIO_Port, &GPIO_InitStruct);

And the interrupt is this way:

/* UART3 interrupt Init */
HAL_NVIC_SetPriority(UART3_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(UART3_IRQn);

And the uart is set in this way:

static void MX_UART3_Init(void)
{

  /* USER CODE BEGIN UART3_Init 0 */

  /* USER CODE END UART3_Init 0 */

  /* USER CODE BEGIN UART3_Init 1 */

  /* USER CODE END UART3_Init 1 */
  huart3.Instance = UART3;
  huart3.Init.BaudRate = 38400;
  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;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN UART3_Init 2 */

  /* USER CODE END UART3_Init 2 */

}

I'm putting a brekpoint here when I send messages though QModBus tool but it's never reached

void UART3_IRQHandler(void)
{
  /* USER CODE BEGIN UART3_IRQn 0 */

  /* USER CODE END UART3_IRQn 0 */
  HAL_UART_IRQHandler(&huart3);
  /* USER CODE BEGIN UART3_IRQn 1 */

  /* USER CODE END UART3_IRQn 1 */
}

What I'm missing?

Thanks in advance for any help

alejoseb / Modbus-STM32-HAL-FreeRTOS

Can't get any interrupt when receive frame #48