STM32和lwip初学者,分享一下网口热插拔功能调试过程。
PHY芯片使用的LAN8720,使用原子哥的lwip扩展例程,原例程初始化LAN8720后是死等。实际项目中网口初始可能不插网线,中途插拔网线等,因此对程序进行修改。
1)先是参考ST官方以太网库,最新版以太网库为2015年5月份(keil5中software packs中下载,或到keil官网下载较快),在此库中采用了外部中断的方式判断网口插拔状态。由于LAN8720的中断口和CLKOUT复用,因此使用中断,只能使用50MHZ方案。电路按照50MHZ更改后。参照官网实现思路,添加程序到工程中。结果发现插拔网口能够检测到中断,但是检测的状态始终是link_down. 苦苦寻找原因,未果。最终放弃中断方式,采用轮询方案。
2)轮询方案的思路是,建立一个低优先级任务,每隔一段时间检测link状态,如果程序运行第一次检测,检测结果为连接,则将该任务挂起。如果第一次检测为断开,则程序会继续检测,直到检测到连接,则对MAC和DMA重新做一遍初始化。经过调试该方法可行。
附中断方案:(调试未成功,主要原因为中断中检测link状态与实际不符,另ST官网例程检测到网口重新连接后只进行了MAC的重新初始化,未进行DMA初始化,经过实验,发现初始化MAC和DMA才正常,只初始化MAC,会出错)[C] 纯文本查看 复制代码
ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable; //????DMA?????????·????????ETH_InitStructure.ETH_FixedBurst = ETH_FixedBurst_Enable; //???????¨??·????? ETH_InitStructure.ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat; //DMA·?????×??ó??·??¤????32?????? ETH_InitStructure.ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;//DMA??????×??ó??·??¤????32??????ETH_InitStructure.ETH_DMAArbitration = ETH_DMAArbitration_RoundRobin_RxTx_2_1;rval=ETH_Init(Ð_InitStructure,LAN8720_PHY_ADDRESS);//????ETH//=======2015/07/08 added by sucore ????????°????í???ò========================//?ù??ST??·???????????????????if( rval == ETH_ERROR ) { printf("ETH init error, may be no linkn"); } EthStatus=rval; if(ETH_ReadPHYRegister(LAN8720_PHY_ADDRESS, PHY_BSR) & 4) { EthStatus |= ETH_LINK_FLAG; } /* Configure the PHY to generate an interrupt on change of link status */ Eth_Link_PHYITConfig(LAN8720_PHY_ADDRESS); /* Configure the EXTI for Ethernet link status. */ Eth_Link_EXTIConfig(); /* Enable the Ethernet Rx Interrupt */ ETH_DMAITConfig(ETH_DMA_IT_NIS | ETH_DMA_IT_R , ENABLE); //==============================================================================[C] 纯文本查看 复制代码
//==================2015/07/08 added by sucore ================================//==================????????°??à?????í????=====================================/** * @brief Configure the PHY to generate an interrupt on change of link status. * @param PHYAddress: external PHY address * @retval None */uint32_t Eth_Link_PHYITConfig(uint16_t PHYAddress){ uint32_t tmpreg = 0; /* Read MASK register */ tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_MASK); /* Enable output interrupt events to signal via the INT pin */ tmpreg |= (uint32_t)PHY_MASK_LINK_INT_EN | PHY_MASK_ENERGYON_INT_EN; if(!(ETH_WritePHYRegister(PHYAddress, PHY_MASK, tmpreg))) { /* Return ERROR in case of write timeout */ return ETH_ERROR; } /* Read INT register */ tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_INT); /* Enable Interrupt on change of link status */ tmpreg |= (uint32_t)PHY_INT_LINK_STATUS|PHY_INT_ENERGYON_STATUS; if(!(ETH_WritePHYRegister(PHYAddress, PHY_INT, tmpreg))) { /* Return ERROR in case of write timeout */ return ETH_ERROR; } /* Return SUCCESS */ return ETH_SUCCESS; }//==================2015/07/08 added by sucore ================================//==================????????°??à?????í????=====================================/** * @brief EXTI configuration for Ethernet link status. * @param PHYAddress: external PHY address * @retval None */void Eth_Link_EXTIConfig(void){ GPIO_InitTypeDef GPIO_InitStructure; EXTI_InitTypeDef EXTI_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; /* Enable the INT (PB14) Clock */ RCC_AHB1PeriphClockCmd(ETH_LINK_GPIO_CLK, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); /* Configure INT pin as input */ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Pin = ETH_LINK_PIN; GPIO_Init(ETH_LINK_GPIO_PORT, &GPIO_InitStructure); /* Connect EXTI Line to INT Pin */ SYSCFG_EXTILineConfig(ETH_LINK_EXTI_PORT_SOURCE, ETH_LINK_EXTI_PIN_SOURCE); /* Configure EXTI line */ EXTI_InitStructure.EXTI_Line = ETH_LINK_EXTI_LINE; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); /* Enable and set the EXTI interrupt to priority 1*/ NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}//==================2015/07/08 added by sucore ================================//==================????????°??à?????í????=====================================/** * @brief This function handles Ethernet link status. * @param None * @retval None */void Eth_Link_ITHandler(uint16_t PHYAddress){u32 temp;//OS_CPU_SR cpu_sr;//OS_ENTER_CRITICAL(); /* Check whether the link interrupt has occurred or not */ if( ((ETH_ReadPHYRegister(PHYAddress, PHY_INT)) & PHY_INT_LINK_STATUS)!= 0) { delay_ms(1);temp=(ETH_ReadPHYRegister(PHYAddress, PHY_BSR) & 4); if(temp) { netif_set_link_up(&lwip_netif); } else { netif_set_link_down(&lwip_netif); } }//OS_EXIT_CRITICAL();}//==================2015/07/08 added by sucore ================================//==================????????°??à?????í????=====================================/** * @brief This function handles External line 10 interrupt request. * @param None * @retval None */void EXTI15_10_IRQHandler(void){ if(EXTI_GetITStatus(ETH_LINK_EXTI_LINE) != RESET) { Eth_Link_ITHandler(LAN8720_PHY_ADDRESS); // ETH_Init(Ð_InitStructure,LAN8720_PHY_ADDRESS);/* Clear interrupt pending bit */ EXTI_ClearITPendingBit(ETH_LINK_EXTI_LINE); }}
轮询方案
[C] 纯文本查看 复制代码
/**********************************************************?????????? ???????í????×??? 2015/07/11 added by sucore?????????? ???????????? ×????? 0???? 1???????????÷?? ??**********************************************************/u8 netlink_status_check(void){ // u32 temp=0; static u32 cursta,presta; static u8 cnt; //u8 retval; cursta=(ETH_ReadPHYRegister(LAN8720_PHY_ADDRESS, PHY_BSR) & 4); cnt++; if(cursta!=presta) { if(cnt!=1) { if(cursta) { netif_set_link_up(&lwip_netif); } else { netif_set_link_down(&lwip_netif); } } else {;} cnt=2; } else {cnt=2;} presta=cursta;return cursta;}void netlink_task(void *pdata){ OS_CPU_SR cpu_sr;static u8 sta=0; while(1) { //u32 temp; OSTimeDlyHMSM(0,0,2,500); /* Check whether the link interrupt has occurred or not */ OS_ENTER_CRITICAL(); if(netlink_status_check()){ sta=1;}OS_EXIT_CRITICAL();if(sta) break;} OSTaskSuspend(OS_PRIO_SELF); OSTimeDlyHMSM(0,0,0,500);}
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