【LwIP学习营】【第一周】移植中遇到phy芯片不一致及其解...

发布于 2018-05-17 16:24:51 浏览：4639 订阅该版

* 本帖最后由 碧水渊 于 2018-5-17 16:52 编辑 *

RTT+LWIP学习第一周

目标开发板：单片机STM32F407IGT6，PHY芯片DP83848源码版本  ：RT-Thread官方源码3.0.3
源码的bsp中包含stm32f40x的rtt，通过env建立MDK工程，重新选择了目标芯片以后。遇到了第一个问题：bsp中的phy芯片是LAN9720和我的phy芯片不一致。解决办法：硬件原理图如下所示![phy原理图.png](/uploads/201805/17/162353jitv0kyekb04ea89.png)由于是phy芯片不一致，修改phy芯片相关的操作。即修改stm32f4xx_eth.c中的函数static voidphy_monitor_thread_entry(void *parameter)。
第一步：定义phy芯片DP83848的地址和用到的寄存器#define DP83848_PHY_ADDRESS 0x01/* PHY registers */#define PHY_MICR                    0x11 /* MII Interrupt Control Register */#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                    0x12 /* MII Interrupt Status and Misc. Control Register */#define PHY_MISR_LINK_INT_EN        ((uint16_t)0x0020) /* Enable Interrupt on change of link status */#define PHY_LINK_STATUS             ((uint16_t)0x2000) /* PHY link status interrupt mask */#define PHY_PHYSTS                  0x01 /* PHY Status Register*/#define PHY_PHYSTS_AUTONEG_COMPLETE ((uint16_t)0x0010) /* 自动协商完成 */#define PHY_PHYSTS_DUPLEX_STATUS    ((uint16_t)0x0004) /* 全双工，半双工，状态标识*/#define PHY_PHYSTS_SPEED_STATUS     ((uint16_t)0x0002) /* 10Mb/s和100Mb/s速度状态标识 */#define PHY_PHYSTS_LINK_STATUS      ((uint16_t)0x0001) /* 建立有效连接状态标识 */

第二步：初始化phy芯片DP83848/* Read MICRregister */tmpreg =ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_MICR);
/* Enable output interrupt events to signalvia the INT pin */tmpreg |= (uint32_t)PHY_MICR_INT_EN |PHY_MICR_INT_OE;if(!(ETH_WritePHYRegister(DP83848_PHY_ADDRESS, PHY_MICR, tmpreg))){       /* Return ERROR in case of writetimeout */       STM32_ETH_PRINTF("phy writetimeout <br>");}
/* Read MISR register */tmpreg =ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_MISR);
/* Enable Interrupt on change of linkstatus */tmpreg |= (uint32_t)PHY_MISR_LINK_INT_EN;if(!(ETH_WritePHYRegister(DP83848_PHY_ADDRESS, PHY_MISR, tmpreg))){        /* Return ERROR in case of writetimeout */        STM32_ETH_PRINTF("phy writetimeout <br>");}/* Return SUCCESS */STM32_ETH_PRINTF("phy init <br>");第三步：修改读取phy芯片DP83848的link status的函数uint16_t status =ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_PHYSTS);STM32_ETH_PRINTF("DP83848PHYSTS:0x%04X <br>", status);phy_speed_new = 0;if(status &(PHY_PHYSTS_AUTONEG_COMPLETE |PHY_PHYSTS_LINK_STATUS)) //link status changed {       phy_speed_new = PHY_LINK_MASK;       if((status & 0x03) == 1)       {             phy_speed_new |= PHY_100M_MASK;       }
       if(status & 0x04)       {             phy_speed_new |= PHY_DUPLEX_MASK;       }}第4步，编译完成，下载到开发板。通过网线把开发板连接到路由器上。在finsh窗口中输入list_if()命令。![listif.png](/uploads/201805/17/162419uz0v941cokc0cevm.png)查看IP地址为192.168.1.100在电脑的cmd窗口中就可以ping通开发板。![pcping.png](/uploads/201805/17/162419yv5s33c545vqv44y.png)