STM32F7加DP83848移植LWIP后有时候能连上网有时候又连不上
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 ;
heth.Instance = ETH;
heth.Init.AutoNegotiation = ETH_AUTONEGOTIATION_ENABLE;
heth.Init.PhyAddress = 1;//LAN8742A_PHY_ADDRESS;
MACAddr = 0x00;
MACAddr = 0x80;
MACAddr = 0xE1;
MACAddr = 0x00;
MACAddr = 0x00;
MACAddr = 0x00;
heth.Init.MACAddr = &MACAddr;
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, ETH_TXBUFNB);
/* Initialize Rx Descriptors list: Chain Mode*/
HAL_ETH_DMARxDescListInit(&heth, DMARxDscrTab, &Rx_Buff, ETH_RXBUFNB);
#if LWIP_ARP || LWIP_ETHERNET
/* set MAC hardware address length */
netif->hwaddr_len = ETH_HWADDR_LEN;
/* set MAC hardware address */
netif->hwaddr =heth.Init.MACAddr;
netif->hwaddr =heth.Init.MACAddr;
netif->hwaddr =heth.Init.MACAddr;
netif->hwaddr =heth.Init.MACAddr;
netif->hwaddr =heth.Init.MACAddr;
netif->hwaddr =heth.Init.MACAddr;
/* 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 = 192;
IP_ADDRESS1 = 168;
IP_ADDRESS1 = 4;
IP_ADDRESS1 = 161;
NETMASK_ADDRESS = 255;
NETMASK_ADDRESS = 255;
NETMASK_ADDRESS = 255;
NETMASK_ADDRESS = 0;
GATEWAY_ADDRESS = 192;
GATEWAY_ADDRESS = 168;
GATEWAY_ADDRESS = 4;
GATEWAY_ADDRESS = 1;
/* Initilialize the LwIP stack without RTOS */
lwip_init();
IP4_ADDR(&ipaddr, IP_ADDRESS1, IP_ADDRESS1, IP_ADDRESS1, IP_ADDRESS1);
IP4_ADDR(&netmask, NETMASK_ADDRESS, NETMASK_ADDRESS , NETMASK_ADDRESS, NETMASK_ADDRESS);
IP4_ADDR(&gw, GATEWAY_ADDRESS, GATEWAY_ADDRESS, GATEWAY_ADDRESS, GATEWAY_ADDRESS);
/* 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！
首选，使用 ping 192.168.4.161
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。 DP和LAN的寄存器还是有区别的，我建议你可以参考下STM32F756G-EVAL的网络例程，用的也是DP83848，复制那几个配置文件，差不多只需要修改IO管脚就能简单的测试下。 我也遇到了同样的问题，使用stm32f429是没问题的，但是换成stm32f767就不行了，楼主解决没有？
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