新手上路
- 积分
- 44
- 金钱
- 44
- 注册时间
- 2019-5-14
- 在线时间
- 18 小时
|
发表于 2019-6-11 15:11:22
|
显示全部楼层
我是按一下思路做了一遍可是没有效果，下面有完整文章的连接 大家帮忙看看 是不是我漏掉了什么
开发背景：
1、主芯片—STM32F107rct6；
2、TCP/IP协议栈—LWIP，依托ST例程移植；
3、操作系统—无（裸机）；
异常现象：
1、网线不插入的情况下先给设备上电，之后再插入网线无法ping通；（如果上电前网线插入，网络正常）；
2、网络已经正常的情况下，电脑PC端修改传输模式（比如从原来的100M全双工修改为10M全双工）导致网络不通；
原因分析：
1、针对第一种异常情况，是由于上电时网线未插入，导致ETH初始化部分未能成功完成，之后即使再插入网线，程序中没有再次进行初始化的逻辑补充，从而导致网络异常；
2、针对第二种情况，情况是上电时完成了ETH的初始化并与PC协商成功，此时网络正常。但当PC端修改传输模式后，程序中未能执行再次协商与MAC的初始化工作，导致网络异常；
解决方法：
首先，要明确上述问题的关键点所在，所有的异常均是网线的拔插导致（PC端修改连接传输方式时也相当于网线的拔掉重插），因此主程序中必须要有对当前网络连接与断开的检测或者利用PHY芯片的中断引脚；
其次，无论利用轮询或是PHY中断配置引脚，根本的原理都是一样的，就是感知到网络的连接与断开，下面给出采用的查询方式：
void Eth_Link_ITHandler(struct netif *netif)
{
/* Check whether the link interrupt has occurred or not */
if(((ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_MISR)) & PHY_LINK_STATUS) != 0){/*检测插拔中断*/
uint16_t status = ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_BSR);
if(status & (PHY_AutoNego_Complete | PHY_Linked_Status)){/*检测到网线连接*/
if(EthInitStatus == 0){/*之前未成功初始化过*/
/*Reinit PHY*/
ETH_Reinit();
}
else{/*之前已经成功初始化*/
/*set link up for re link callbalk function*/
netif_set_link_up(netif);
}
}
else{/*网线断开*/\
/*set link down for re link callbalk function*/
netif_set_link_down(netif);
}
}
}
备注说明：将该检测函数放入主循环，程序中标注的部分为解决网线热拔插问题的关键点。
1、标注红色的部分执行的条件是检测到网线插入且之前ETH部分未成功初始化过（即之前一直处在上电但网线未插入）的情况，此时需要对ETH重新初始化，从而解决异常现象的第一种情况，具体执行内容为：
/**
* @brief : first time power on but init failed, do again
* @param : None
*
* @retval : None
* @Author : xuk
*/
void ETH_Reinit(void){
/* Configure Ethernet */
EthInitStatus =
ETH_Init(Ð_InitStructure, DP83848_PHY_ADDRESS);
}
其中ETH_InitStructure已设为全局结构体；
2、标注蓝色部分的执行条件是已经成功初始化过ETH，但之后出现了网线的拔插情况，此时需要在每次检测到网络连接时重新进行自协商并初始化MAC，具体的执行流程如下介绍：
A、检测到该条件时，首先调用：
netif_set_link_up(netif);
netif_set_link_down(netif);
B、追溯两个函数的定义处，如下：
#if LWIP_NETIF_LINK_CALLBACK
/**
* Called by a driver when its link goes up
*/
void netif_set_link_up(struct netif *netif )
{
netif->flags |= NETIF_FLAG_LINK_UP;
#if LWIP_DHCP
if (netif->dhcp) {
dhcp_network_changed(netif);
}
#endif /* LWIP_DHCP */
#if LWIP_AUTOIP
if (netif->autoip) {
autoip_network_changed(netif);
}
#endif /* LWIP_AUTOIP */
if (netif->flags & NETIF_FLAG_UP) {
#if LWIP_ARP
/* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */
if (netif->flags & NETIF_FLAG_ETHARP) {
etharp_gratuitous(netif);
}
#endif /* LWIP_ARP */
#if LWIP_IGMP
/* resend IGMP memberships */
if (netif->flags & NETIF_FLAG_IGMP) {
igmp_report_groups( netif);
}
#endif /* LWIP_IGMP */
}
NETIF_LINK_CALLBACK(netif);
}
/**
* Called by a driver when its link goes down
*/
void netif_set_link_down(struct netif *netif )
{
netif->flags &= ~NETIF_FLAG_LINK_UP;
NETIF_LINK_CALLBACK(netif);
}
/**
* Ask if a link is up
*/
u8_t netif_is_link_up(struct netif *netif)
{
return (netif->flags & NETIF_FLAG_LINK_UP) ? 1 : 0;
}
/**
* Set callback to be called when link is brought up/down
*/
void
netif_set_link_callback(struct netif *netif, void (* link_callback)(struct netif *netif ))
{
if (netif) {
netif->link_callback = link_callback;
}
}
#endif /* LWIP_NETIF_LINK_CALLBACK */
注意：I：从上述看出，若要这两个函数有效编译，则必须定义宏LWIP_NETIF_LINK_CALLBACK 为1，请自行设置；
II：函数netif_set_link_callback的作用是指定网络连接发生改变时的回调函数；
III：详细的讲一下主要思路，Eth_Link_ITHandler执行中检测到网线拔插时分别调用netif_set_link_up(netif)、netif_set_link_down(netif);这两个函数的调用会引发netif_set_link_callback的执行，从而执行指定的网络连接或断开的回调函数；
Ⅳ：通过netif_set_link_callback该函数在LWIP初始化的时候指定网络连接变化的回调函数，可放置如下位置：
void LwIP_Init(void){
......
......
......
......
/*set the link up or link down callback function - xuk*/
netif_set_link_callback(&netif,eth_re_link);
}
do
{
tickstart++;
} while (!(ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_BSR) & PHY_AutoNego_Complete) && (tickstart < (uint32_t)PHY_READ_TO));
/* Return ERROR in case of timeout */
if(tickstart == PHY_READ_TO)
{
// return ETH_ERROR;
}
/* Reset Timeout counter */
tickstart = 0;
/* Read the result of the auto-negotiation */
regvalue = ETH_ReadPHYRegister(DP83848_PHY_ADDRESS, PHY_SR);
/* Configure the MAC with the Duplex Mode fixed by the auto-negotiation process */
if((regvalue & PHY_DUPLEX_STATUS) != (uint32_t)RESET)
{
/* Set Ethernet duplex mode to Full-duplex following the auto-negotiation */
ETH_InitStructure.ETH_Mode = ETH_Mode_FullDuplex;
}
else
{
/* Set Ethernet duplex mode to Half-duplex following the auto-negotiation */
ETH_InitStructure.ETH_Mode = ETH_Mode_HalfDuplex;
}
/* Configure the MAC with the speed fixed by the auto-negotiation process */
if(regvalue & PHY_SPEED_STATUS)
{
/* Set Ethernet speed to 10M following the auto-negotiation */
ETH_InitStructure.ETH_Speed = ETH_Speed_10M;
}
else
{
/* Set Ethernet speed to 100M following the auto-negotiation */
ETH_InitStructure.ETH_Speed = ETH_Speed_100M;
}
}
else{/*AutoNegotiation_Disable*/
if(!ETH_WritePHYRegister(DP83848_PHY_ADDRESS, PHY_BCR, ((uint16_t)(ETH_InitStructure.ETH_Mode >> 3) |
(uint16_t)(ETH_InitStructure.ETH_Speed >> 1))))
{
/* Return ERROR in case of write timeout */
// return ETH_ERROR;
}
/* Delay to assure PHY configuration */
// _eth_delay_(PHY_CONFIG_DELAY);
}
/*------------------------ ETHERNET MACCR Configuration --------------------*/
/* Get the ETHERNET MACCR value */
tmpreg = ETH->MACCR;
/* Clear WD, PCE, PS, TE and RE bits */
tmpreg &= MACCR_CLEAR_MASK;
/* Set the WD bit according to ETH_Watchdog value */
/* Set the JD: bit according to ETH_Jabber value */
/* Set the IFG bit according to ETH_InterFrameGap value */
/* Set the DCRS bit according to ETH_CarrierSense value */
/* Set the FES bit according to ETH_Speed value */
/* Set the DO bit according to ETH_ReceiveOwn value */
/* Set the LM bit according to ETH_LoopbackMode value */
/* Set the DM bit according to ETH_Mode value */
/* Set the IPCO bit according to ETH_ChecksumOffload value */
/* Set the DR bit according to ETH_RetryTransmission value */
/* Set the ACS bit according to ETH_AutomaticPadCRCStrip value */
/* Set the BL bit according to ETH_BackOffLimit value */
/* Set the DC bit according to ETH_DeferralCheck value */
tmpreg |= (uint32_t)(ETH_InitStructure.ETH_Watchdog |
ETH_InitStructure.ETH_Jabber |
ETH_InitStructure.ETH_InterFrameGap |
ETH_InitStructure.ETH_CarrierSense |
ETH_InitStructure.ETH_Speed |
ETH_InitStructure.ETH_ReceiveOwn |
ETH_InitStructure.ETH_LoopbackMode |
ETH_InitStructure.ETH_Mode |
ETH_InitStructure.ETH_ChecksumOffload |
ETH_InitStructure.ETH_RetryTransmission |
ETH_InitStructure.ETH_AutomaticPadCRCStrip |
ETH_InitStructure.ETH_BackOffLimit |
ETH_InitStructure.ETH_DeferralCheck);
/* Write to ETHERNET MACCR */
ETH->MACCR = (uint32_t)tmpreg;
/*----------------------- ETHERNET MACFFR Configuration --------------------*/
/* Set the RA bit according to ETH_ReceiveAll value */
/* Set the SAF and SAIF bits according to ETH_SourceAddrFilter value */
/* Set the PCF bit according to ETH_PassControlFrames value */
/* Set the DBF bit according to ETH_BroadcastFramesReception value */
/* Set the DAIF bit according to ETH_DestinationAddrFilter value */
/* Set the PR bit according to ETH_PromiscuousMode value */
/* Set the PM, HMC and HPF bits according to ETH_MulticastFramesFilter value */
/* Set the HUC and HPF bits according to ETH_UnicastFramesFilter value */
/* Write to ETHERNET MACFFR */
ETH->MACFFR = (uint32_t)(ETH_InitStructure.ETH_ReceiveAll |
ETH_InitStructure.ETH_SourceAddrFilter |
ETH_InitStructure.ETH_PassControlFrames |
ETH_InitStructure.ETH_BroadcastFramesReception |
ETH_InitStructure.ETH_DestinationAddrFilter |
ETH_InitStructure.ETH_PromiscuousMode |
ETH_InitStructure.ETH_MulticastFramesFilter |
ETH_InitStructure.ETH_UnicastFramesFilter);
/*--------------- ETHERNET MACHTHR and MACHTLR Configuration ---------------*/
/* Write to ETHERNET MACHTHR */
ETH->MACHTHR = (uint32_t)ETH_InitStructure.ETH_HashTableHigh;
/* Write to ETHERNET MACHTLR */
ETH->MACHTLR = (uint32_t)ETH_InitStructure.ETH_HashTableLow;
/*----------------------- ETHERNET MACFCR Configuration --------------------*/
/* Get the ETHERNET MACFCR value */
tmpreg = ETH->MACFCR;
/* Clear xx bits */
tmpreg &= MACFCR_CLEAR_MASK;
/* Set the PT bit according to ETH_PauseTime value */
/* Set the DZPQ bit according to ETH_ZeroQuantaPause value */
/* Set the PLT bit according to ETH_PauseLowThreshold value */
/* Set the UP bit according to ETH_UnicastPauseFrameDetect value */
/* Set the RFE bit according to ETH_ReceiveFlowControl value */
/* Set the TFE bit according to ETH_TransmitFlowControl value */
tmpreg |= (uint32_t)((ETH_InitStructure.ETH_PauseTime << 16) |
ETH_InitStructure.ETH_ZeroQuantaPause |
ETH_InitStructure.ETH_PauseLowThreshold |
ETH_InitStructure.ETH_UnicastPauseFrameDetect |
ETH_InitStructure.ETH_ReceiveFlowControl |
ETH_InitStructure.ETH_TransmitFlowControl);
/* Write to ETHERNET MACFCR */
ETH->MACFCR = (uint32_t)tmpreg;
/*----------------------- ETHERNET MACVLANTR Configuration -----------------*/
/* Set the ETV bit according to ETH_VLANTagComparison value */
/* Set the VL bit according to ETH_VLANTagIdentifier value */
ETH->MACVLANTR = (uint32_t)(ETH_InitStructure.ETH_VLANTagComparison |
ETH_InitStructure.ETH_VLANTagIdentifier);
/*-------------------------------- DMA Config ------------------------------*/
/*----------------------- ETHERNET DMAOMR Configuration --------------------*/
/* Get the ETHERNET DMAOMR value */
tmpreg = ETH->DMAOMR;
/* Clear xx bits */
tmpreg &= DMAOMR_CLEAR_MASK;
/* Set the DT bit according to ETH_DropTCPIPChecksumErrorFrame value */
/* Set the RSF bit according to ETH_ReceiveStoreForward value */
/* Set the DFF bit according to ETH_FlushReceivedFrame value */
/* Set the TSF bit according to ETH_TransmitStoreForward value */
/* Set the TTC bit according to ETH_TransmitThresholdControl value */
/* Set the FEF bit according to ETH_ForwardErrorFrames value */
/* Set the FUF bit according to ETH_ForwardUndersizedGoodFrames value */
/* Set the RTC bit according to ETH_ReceiveThresholdControl value */
/* Set the OSF bit according to ETH_SecondFrameOperate value */
tmpreg |= (uint32_t)(ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame |
ETH_InitStructure.ETH_ReceiveStoreForward |
ETH_InitStructure.ETH_FlushReceivedFrame |
ETH_InitStructure.ETH_TransmitStoreForward |
ETH_InitStructure.ETH_TransmitThresholdControl |
ETH_InitStructure.ETH_ForwardErrorFrames |
ETH_InitStructure.ETH_ForwardUndersizedGoodFrames |
ETH_InitStructure.ETH_ReceiveThresholdControl |
ETH_InitStructure.ETH_SecondFrameOperate);
/* Write to ETHERNET DMAOMR */
ETH->DMAOMR = (uint32_t)tmpreg;
/*----------------------- ETHERNET DMABMR Configuration --------------------*/
/* Set the AAL bit according to ETH_AddressAlignedBeats value */
/* Set the FB bit according to ETH_FixedBurst value */
/* Set the RPBL and 4*PBL bits according to ETH_RxDMABurstLength value */
/* Set the PBL and 4*PBL bits according to ETH_TxDMABurstLength value */
/* Set the DSL bit according to ETH_DesciptorSkipLength value */
/* Set the PR and DA bits according to ETH_DMAArbitration value */
ETH->DMABMR = (uint32_t)(ETH_InitStructure.ETH_AddressAlignedBeats |
ETH_InitStructure.ETH_FixedBurst |
ETH_InitStructure.ETH_RxDMABurstLength | /* !! if 4xPBL is selected for Tx or Rx it is applied for the other */
ETH_InitStructure.ETH_TxDMABurstLength |
(ETH_InitStructure.ETH_DescriptorSkipLength << 2) |
ETH_InitStructure.ETH_DMAArbitration |
ETH_DMABMR_USP); /* Enable use of separate PBL for Rx and Tx */
#ifdef USE_ENHANCED_DMA_DESCRIPTORS
/* Enable the Enhanced DMA descriptors */
ETH->DMABMR |= ETH_DMABMR_EDE;
#endif /* USE_ENHANCED_DMA_DESCRIPTORS */
/* Return Ethernet configuration success */
// return ETH_SUCCESS;
// ETH_Start();
}
else{/*link down process*/
}
}
至此，对于STM32F207（裸机）- LWIP网线热插入网络不通遇到的问题以及解决办法介绍完毕。
原文：https://blog.csdn.net/xukao5671927/article/details/77765464
其中，回调函数eth_re_link的具体内容如下，实现网络拔插后的重新自协商与MAC初始化：
/**
* @brief : process the relink of eth
* @param : netif - - specify the ETH netif
*
* @retval : none
* @author : xuk
*/
void
eth_re_link(struct netif *netif){
__IO uint32_t tickstart = 0;
uint32_t regvalue = 0, tmpreg = 0;
if(netif_is_link_up(netif)){/*link up process*/
if(ETH_InitStructure.ETH_AutoNegotiation == ETH_AutoNegotiation_Enable){/*AutoNegotiation_Enable*/
/* Enable Auto-Negotiation */
ETH_WritePHYRegister(DP83848_PHY_ADDRESS, PHY_BCR, PHY_AutoNegotiation);
/* Wait until the auto-negotiation will be completed */
原文：https://blog.csdn.net/xukao5671927/article/details/77765464
|
|
/2 
|手机版|OpenEdv-开源电子网
( 粤ICP备12000418号-1 )
楼主
HYAddress) 
