• 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
“);}
/ 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
“);}/ Return SUCCESS /STM32_ETH_PRINTF(“phy init
“);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
“, 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。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。