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我是用CUBE生成的工程，因为CUBE默认用的PHY是LAN8742，需要把LAN8742改成DP83848，网上看了很多帖子，将stm32f7xx_hal_conf.h头文件里面关于外部PHY寄存器的定义修改为如下： /* Section 4: Extended PHY Registers */ #define PHY_SR ((uint16_t)0x10U) /*!< PHY status register Offset */ #define PHY_MICR ((uint16_t)0x11) /*!< MII Interrupt Control Register */ #define PHY_MISR ((uint16_t)0x12) /*!< MII Interrupt Status and Misc. Control Register */ #define PHY_LINK_STATUS ((uint16_t)0x0001) /*!< PHY Link mask */ #define PHY_SPEED_STATUS ((uint16_t)0x0002U) /*!< PHY Speed mask */ #define PHY_DUPLEX_STATUS ((uint16_t)0x0004U) /*!< PHY Duplex mask */ //#define PHY_ISFR ((uint16_t)0x000BU) /*!< PHY Interrupt Source Flag register Offset */ //#define PHY_ISFR_INT4 ((uint16_t)0x000BU) /*!< PHY Link down inturrupt */ #define PHY_MICR_INT_EN ((uint16_t)0x0002) /*!< PHY Enable interrupts */ #define PHY_MICR_INT_OE ((uint16_t)0x0001) /*!< PHY Enable output interrupt events */ #define PHY_MISR_LINK_INT_EN ((uint16_t)0x0020) /*!< Enable Interrupt on change of link status */ #define PHY_LINK_INTERRUPT ((uint16_t)0x2000) /*!< PHY link status interrupt mask */ 红色部分注释掉的是cube生成的LAN8742的寄存器定义 然后ethernetif.c文件中的底层初始化函数： static void low_level_init(struct netif *netif) { uint32_t regvalue = 0; HAL_StatusTypeDef hal_eth_init_status; /* Init ETH */ uint8_t MACAddr[6] ; heth.Instance = ETH; heth.Init.AutoNegotiation = ETH_AUTONEGOTIATION_ENABLE; heth.Init.PhyAddress = 1;//LAN8742A_PHY_ADDRESS; MACAddr[0] = 0x00; MACAddr[1] = 0x80; MACAddr[2] = 0xE1; MACAddr[3] = 0x00; MACAddr[4] = 0x00; MACAddr[5] = 0x00; heth.Init.MACAddr = &MACAddr[0]; heth.Init.RxMode = ETH_RXPOLLING_MODE; heth.Init.ChecksumMode = ETH_CHECKSUM_BY_HARDWARE; heth.Init.MediaInterface = ETH_MEDIA_INTERFACE_RMII; hal_eth_init_status = HAL_ETH_Init(&heth); if (hal_eth_init_status == HAL_OK) { /* Set netif link flag */ netif->flags |= NETIF_FLAG_LINK_UP; } /* Initialize Tx Descriptors list: Chain Mode */ HAL_ETH_DMATxDescListInit(&heth, DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB); /* Initialize Rx Descriptors list: Chain Mode */ HAL_ETH_DMARxDescListInit(&heth, DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB); #if LWIP_ARP || LWIP_ETHERNET /* set MAC hardware address length */ netif->hwaddr_len = ETH_HWADDR_LEN; /* set MAC hardware address */ netif->hwaddr[0] = heth.Init.MACAddr[0]; netif->hwaddr[1] = heth.Init.MACAddr[1]; netif->hwaddr[2] = heth.Init.MACAddr[2]; netif->hwaddr[3] = heth.Init.MACAddr[3]; netif->hwaddr[4] = heth.Init.MACAddr[4]; netif->hwaddr[5] = heth.Init.MACAddr[5]; /* maximum transfer unit */ netif->mtu = 1500; /* Accept broadcast address and ARP traffic */ /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */ #if LWIP_ARP netif->flags |= NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP; #else netif->flags |= NETIF_FLAG_BROADCAST; #endif /* LWIP_ARP */ /* Enable MAC and DMA transmission and reception */ HAL_ETH_Start(&heth); /* Read Register Configuration */ HAL_ETH_ReadPHYRegister(&heth, PHY_MICR, ®value); regvalue |= (PHY_MICR_INT_EN | PHY_MICR_INT_OE); /* Enable Interrupt on change of link status */ HAL_ETH_WritePHYRegister(&heth, PHY_MICR , regvalue ); HAL_ETH_ReadPHYRegister(&heth, PHY_MISR , ®value); regvalue |= PHY_MISR_LINK_INT_EN; HAL_ETH_WritePHYRegister(&heth, PHY_MISR, regvalue); } 整个程序跑的流程如下： 第一步初始化LWIP： void MX_LWIP_Init(void) { IP_ADDRESS1[0] = 192; IP_ADDRESS1[1] = 168; IP_ADDRESS1[2] = 4; IP_ADDRESS1[3] = 161; NETMASK_ADDRESS[0] = 255; NETMASK_ADDRESS[1] = 255; NETMASK_ADDRESS[2] = 255; NETMASK_ADDRESS[3] = 0; GATEWAY_ADDRESS[0] = 192; GATEWAY_ADDRESS[1] = 168; GATEWAY_ADDRESS[2] = 4; GATEWAY_ADDRESS[3] = 1; /* Initilialize the LwIP stack without RTOS */ lwip_init(); IP4_ADDR(&ipaddr, IP_ADDRESS1[0], IP_ADDRESS1[1], IP_ADDRESS1[2], IP_ADDRESS1[3]); IP4_ADDR(&netmask, NETMASK_ADDRESS[0], NETMASK_ADDRESS[1] , NETMASK_ADDRESS[2], NETMASK_ADDRESS[3]); IP4_ADDR(&gw, GATEWAY_ADDRESS[0], GATEWAY_ADDRESS[1], GATEWAY_ADDRESS[2], GATEWAY_ADDRESS[3]); /* add the network interface (IPv4/IPv6) without RTOS */ netif_add(&gnetif, &ipaddr, &netmask, &gw, NULL, ðernetif_init, ðernet_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); } } 第二步连接服务器： void tcp_echoclient_connect(void) { ip_addr_t DestIPaddr; DEST_IP_ADDR0 = unWinSkyRecSetDat.strSetDat.DestHostNet.IP_Address.ip1; //112; DEST_IP_ADDR1 = unWinSkyRecSetDat.strSetDat.DestHostNet.IP_Address.ip2; //74; DEST_IP_ADDR2 = unWinSkyRecSetDat.strSetDat.DestHostNet.IP_Address.ip3; //210; DEST_IP_ADDR3 = unWinSkyRecSetDat.strSetDat.DestHostNet.IP_Address.ip4; //81; DEST_PORT = unWinSkyRecSetDat.strSetDat.DestHostNet.NetPortNumber; //8056; /* create new tcp pcb */ echoclient_pcb = tcp_new(); if (echoclient_pcb != NULL) { IP4_ADDR( &DestIPaddr, DEST_IP_ADDR0, DEST_IP_ADDR1, DEST_IP_ADDR2, DEST_IP_ADDR3 ); /* connect to destination address/port */ tcp_connect(echoclient_pcb,&DestIPaddr,DEST_PORT,tcp_echoclient_connected); } } 第三步while（1）里面： 循环读数据 void MX_LWIP_Process(void) { ethernetif_input(&gnetif); sys_check_timeouts(); } 一秒钟一次检测连接状态，如果断开则一直尝试连接服务器 void ConnectToDest(void)//练接服务器 { static int ConnectCase=0; switch(ConnectCase) { case 0: ethernetif_set_link(&gnetif); ConnectCase=1; break; case 1: tcp_echoclient_connect(); ConnectCase=0; break; default: break; } 大致过程就是这样，下载到板子上之后一直连不上，RESET也不行，只有DEBUG的时候一直RESET才能连上，不知道什么原因，请大神们帮忙看看！ |
要确定，你板子上的IP，是否已经设置成功。
当板子连接成功后，再确认 服务器端口 是否开启了。
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