STM32F407 collision between ethernet and DMA

[Vaclav Chrascina]

Posted on April 24, 2018 at 11:22

Hello,

I am continuously sending and receiving data throught DMA. It's working like I expect so I added Ethernet and LwIP in my MXCube project and compiled. Everything works fine until I plug LAN cable. Could you give me some advice what am I doing wrong or what setting did I forget about?

Here is my code:

int main(void)

{

  HAL_Init();

  SystemClock_Config();

  MX_GPIO_Init();

  MX_DMA_Init();  MX_LWIP_Init();  MX_USART3_UART_Init();    HAL_GPIO_WritePin(GPIOB,GPIO_PIN_9,GPIO_PIN_SET);                //set RS 485 into transmit mode      HAL_UART_Transmit_DMA(&huart3, aTxBuffer, 2);  HAL_UART_Receive_DMA (&huart3, aRxBuffer, 4);

  while (1)

  {  }}

static void MX_USART3_UART_Init(void)

{

  huart3.Instance = USART3;

  huart3.Init.BaudRate = 38400;  huart3.Init.WordLength = UART_WORDLENGTH_9B;  huart3.Init.StopBits = UART_STOPBITS_1;  huart3.Init.Parity = UART_PARITY_EVEN;  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(__FILE__, __LINE__);  }

}

static void MX_DMA_Init(void)

{  /* DMA controller clock enable */  __HAL_RCC_DMA1_CLK_ENABLE();

  /* DMA interrupt init */

  /* DMA1_Stream1_IRQn interrupt configuration */  HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 0, 0);  HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn);  /* DMA1_Stream3_IRQn interrupt configuration */  HAL_NVIC_SetPriority(DMA1_Stream3_IRQn, 0, 0);  HAL_NVIC_EnableIRQ(DMA1_Stream3_IRQn);

}

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *UartHandle)

{    __NOP();  /* Set transmission flag: transfer complete */    HAL_GPIO_WritePin(GPIOB,GPIO_PIN_9,GPIO_PIN_RESET);                    //RS 485 receive mode    //DataRecieved = 0;    UartReady = SET;}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *UartHandle)

{    __NOP();  /* Set transmission flag: transfer complete */    HAL_GPIO_WritePin(GPIOB,GPIO_PIN_9,GPIO_PIN_SET);                        //RS 485 transmit mode    //DataRecieved = 1;    UartReady = SET;    HAL_UART_Transmit_DMA(&huart3, aTxBuffer, 2);}#uart #stm32f4 #dma #etherent