正点原子阿波罗F429+STM32CubeMX+LAN8720+LWIP+Freetos:带操作系统实现网络热插拔

1、前言

前文提要
点击跳转
点击跳转代码下载

2、STM32CubeMX配置

打开ETH中断

配置freertos

已经配置完成了，点击生成代码。打开代码。

3、代码调试

3.1、main.c调试

1.删除掉main函数里面的use_lwip_process();
2.把printf(“程序开始\r\n”); 移动到MX_USART1_UART_Init(); 后面。

  MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
	printf("程序开始\r\n");
  /* USER CODE END 2 */

  /* Call init function for freertos objects (in freertos.c) */
  MX_FREERTOS_Init(); 

  /* Start scheduler */
  osKernelStart();
  
  /* We should never get here as control is now taken by the scheduler */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  printf("程序开始\r\n");
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }

3.2 、use_lwip.c

修改use_lwip_process函数

void use_lwip_process(void)
{
	use_read_network_cable();
}

3.3、lwip.c

修改MX_LWIP_Init函数

void MX_LWIP_Init(void)
{
  /* Initilialize the LwIP stack with RTOS */
  tcpip_init( NULL, NULL );

  /* IP addresses initialization with DHCP (IPv4) */
  ipaddr.addr = 0;
  netmask.addr = 0;
  gw.addr = 0;

  /* add the network interface (IPv4/IPv6) with RTOS */
  netif_add(&gnetif, &ipaddr, &netmask, &gw, NULL, &ethernetif_init, &tcpip_input);

  /* Registers the default network interface */
  netif_set_default(&gnetif);

  if (netif_is_link_up(&gnetif))
  {
    /* When the netif is fully configured this function must be called */
    netif_set_up(&gnetif);
  }
  else
  {
    /* When the netif link is down this function must be called */
    netif_set_down(&gnetif);
  }

  /* Set the link callback function, this function is called on change of link status*/
  netif_set_link_callback(&gnetif, ethernetif_update_config);

  /* create a binary semaphore used for informing ethernetif of frame reception */
    

  /* Start DHCP negotiation for a network interface (IPv4) */
  dhcp_start(&gnetif);

/* USER CODE BEGIN 3 */
	osThreadId_t lkTaskHandle;
    
	const osThreadAttr_t defaultTask_attributes = {
		.name = "lkTask",
		.priority = (osPriority_t) osPriorityNormal,
		.stack_size = configMINIMAL_STACK_SIZE * 2,
	};
	lkTaskHandle = osThreadNew(ethernetif_set_link, &gnetif, &defaultTask_attributes);
/* USER CODE END 3 */
}

3.4、ethernetif.c

把函数void ethernetif_set_link(void const *argument) 修改为void ethernetif_set_link(void *argument) ，去掉传递参数的const。同理修改ethernetif.h里面的函数名。
传递参数改变了，修改里面的代码为：

void ethernetif_set_link(void *argument)
{
  uint32_t regvalue = 0;
  struct netif *gnetif = (struct netif *)argument;
  
  for(;;)
  {
    /* Read PHY_BSR*/
    HAL_ETH_ReadPHYRegister(&heth, PHY_BSR, &regvalue);
    
    regvalue &= PHY_LINKED_STATUS;
    
    /* Check whether the netif link down and the PHY link is up */
    if(!netif_is_link_up(gnetif) && (regvalue))
    {
      /* network cable is connected */ 
      netif_set_link_up(gnetif);        
    }
    else if(netif_is_link_up(gnetif) && (!regvalue))
    {
      /* network cable is dis-connected */
      netif_set_link_down(gnetif);
    }
    
    /* Suspend thread for 200 ms */
    osDelay(200);
  }
}

3.5、stm32f4xx_hal_eth.c

打开stm32f4xx_hal_eth.c找到==HAL_StatusTypeDef HAL_ETH_Init(ETH_HandleTypeDef *heth)==函数修改里面的两端代码(不修改也没事,只是开机有时候会判断为连接错误,具体原因没找.)

      if((HAL_GetTick() - tickstart ) > ETH_TIMEOUT_LINKED_STATE)
      {
//        /* In case of write timeout */
//        err = ETH_ERROR;
//      
//        /* Config MAC and DMA */
//        ETH_MACDMAConfig(heth, err);
//        
//        heth->State= HAL_ETH_STATE_READY;
//  
//        /* Process Unlocked */
//        __HAL_UNLOCK(heth);
//    
//        return HAL_TIMEOUT;
		  break;
      }
    } while (((phyreg & PHY_LINKED_STATUS) != PHY_LINKED_STATUS));

      if((HAL_GetTick() - tickstart ) > ETH_TIMEOUT_AUTONEGO_COMPLETED)
      {
//        /* In case of write timeout */
//        err = ETH_ERROR;
//      
//        /* Config MAC and DMA */
//        ETH_MACDMAConfig(heth, err);
//        
//        heth->State= HAL_ETH_STATE_READY;
//  
//        /* Process Unlocked */
//        __HAL_UNLOCK(heth);
//    
//        return HAL_TIMEOUT;
		  break;
      }
      
    } while (((phyreg & PHY_AUTONEGO_COMPLETE) != PHY_AUTONEGO_COMPLETE));

3.6、freertos.c

1.添加头文件 #include “use_lwip.H”

/* USER CODE BEGIN Includes */     
#include "use_lwip.H"
/* USER CODE END Includes */

在StartDefaultTask函数添加一句use_lwip_process(); 即可。

void StartDefaultTask(void *argument)
{
  /* init code for LWIP */
  MX_LWIP_Init();
  /* USER CODE BEGIN StartDefaultTask */
  /* Infinite loop */
  for(;;)
  {
	  use_lwip_process();
    osDelay(1);
  }
  /* USER CODE END StartDefaultTask */
}

4、运行

编译,连接开发版.打开串口调试助手,烧录代码到开发版.可以尝试插拔网线,并查看串口返回的信息.