STM32F407+LAN8720A +LWIP +FreeRTOS ping通
上一篇实现了LWIP ping 通

本篇实现UDP通讯

实现如下功能：

1. 串口1空闲中断+DMA接收，收到数据用UDP发送
2. UDP接收，收到数据用串口1发送

STM32CUBEIDE配置和代码

1. 配置UARAT1的空闲中断+DMA接收

UART1接收到数据，释放信号量，在任务中进行数据处理（UDP发送）

/* USER CODE END Header_StartTask03 */
void StartTask03(void const * argument)
{
   
  /* USER CODE BEGIN StartTask03 */
	uint16_t len_data;
	HAL_UARTEx_ReceiveToIdle_DMA(&huart1, buletooth_rxBuf, 250);
	hdma_usart1_rx.Instance->CR  &= ~(DMA_IT_HT);//取消接收一半中断

  /* Infinite loop */
  for(;;)
  {
   
	  //UART RECEIVED, UDP SEND
	  osSemaphoreWait (BinarySem_BLUE_RecHandle, osWaitForever);
	  if(ble_rxBuf_len > 0)
	  {
   
		  len_data = ble_rxBuf_len;
		  udp_client_send_data(buletooth_rxBuf, len_data);
	  }
  }
  /* USER CODE END StartTask03 */
}

/* Private application code --------------------------------------------------*/
/* USER CODE BEGIN Application */
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{
   
	if(huart->Instance ==  USART1)
	{
   
		ble_rxBuf_len = Size;
		osSemaphoreRelease (BinarySem_BLUE_RecHandle);
		HAL_UARTEx_ReceiveToIdle_DMA(&huart1, buletooth_rxBuf, 250);
	}
}

2. 配置UDP

void udp_client_init(void)
{
   
	ip_addr_t serverIP;
	err_t err;

	IP4_ADDR(&serverIP, 192, 168, 111, 11);

    upcb = udp_new();

    if (upcb != NULL)
    {
   
        /* 配置本地端口 */
        upcb->local_port = UDP_LOCAL_PORT;

        /* 配置服务器IP和端口号*/
        err = udp_connect(upcb, &serverIP, UDP_REMOTE_PORT);

        if (err == ERR_OK)
        {
   
            /* 注册接收回调函数 */
            udp_recv(upcb, udp_receive_callback, NULL);

            printf("UDP INIT SUCCESS\r\n");
        }
        else
        {
   
            udp_remove(upcb);
        }
    }
}
static void udp_receive_callback(void *arg, struct udp_pcb *upcb,struct pbuf *p, const ip_addr_t *addr, u16_t port)
{
   
    if (p != NULL)
    {
   
        struct pbuf *ptmp = p;

        while (ptmp != NULL)
        {
   
            memset(cache_udprece, 0, sizeof(cache_udprece));