如何通过正点原子探索者实现DHCP求助 - 平头弟

如何通过正点原子探索者实现DHCP求助

2019-07-20 05:32发布

站内问答 / STM32/STM8

4832 5

一、环境说明：
1.硬件环境：正点原子探索者开发板
2.实验目的：实现DHCP自动获取IP地址，能够通过电脑ping通该IP地址；
3.实验过程：探索者F4资料盘(A盘)  ->  4程序源码  ->3扩展例程  ->  2LWIP扩展例程  ->  网络实验1LWIP无操作系统移植,将该程序编译下载到开发板，液晶屏显示DHCP成功，并能成功通过电脑去ping通该IP地址；由于自行设计控制板没有外扩RAM，该例程并无法直接用于本人自己设计的控制板，所以想通过官方一个简单的例程进行修改以达到DHCP功能，于是选择了探索者F4 资料盘(A盘)6，软件资料4，LWIP学习资料STM32F4x7_ETH_LwIP_V1.1.0STM32F4x7_ETH_LwIP_V1.1.0ProjectStandalone cp_echo_client，选择该例程进行修改，代码及问题描述如下：
4.程序代码：

int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
ETH_BSP_Config();
LwIP_Init();
while (1)
{
   LwIP_Periodic_Handle(LocalTime);
}
}

void ETH_BSP_Config(void){  RCC_ClocksTypeDef RCC_Clocks;  SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);  RCC_GetClocksFreq(&RCC_Clocks);  SysTick_Config(RCC_Clocks.HCLK_Frequency/ 100);  NVIC_SetPriority(SysTick_IRQn, 0);  ETH_GPIO_Config();  ETH_MACDMA_Config();if(ETH_ReadPHYRegister(LAN8720A_PHY_ADDRESS,PHY_BSR) & PHY_Linked_Status){       EthStatus|= ETH_LINK_FLAG;}}void ETH_GPIO_Config(void){  GPIO_InitTypeDef GPIO_InitStructure;  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE); #ifdef MII_MODE /* Mode MII with STM324xx-EVAL  */  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA |RCC_AHB1Periph_GPIOB |                      RCC_AHB1Periph_GPIOC| RCC_AHB1Periph_GPIOI |                      RCC_AHB1Periph_GPIOG| RCC_AHB1Periph_GPIOH |                      RCC_AHB1Periph_GPIOF| RCC_AHB1Periph_GPIOD,ENABLE);        #ifdef PHY_CLOCK_MCO  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_8;  GPIO_InitStructure.GPIO_Speed =GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_OType =GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd  =GPIO_PuPd_NOPULL ;   GPIO_Init(GPIOA, &GPIO_InitStructure);  RCC_MCO1Config(RCC_MCO1Source_HSE,RCC_MCO1Div_1); #endif /* PHY_CLOCK_MCO */  SYSCFG_ETH_MediaInterfaceConfig(SYSCFG_ETH_MediaInterface_MII);#elif defined RMII_MODE  /* Mode RMII withSTM324xx-EVAL */  /* Enable GPIOs clocks */  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA |RCC_AHB1Periph_GPIOC |                      RCC_AHB1Periph_GPIOG| RCC_AHB1Periph_GPIOD , ENABLE);       SYSCFG_ETH_MediaInterfaceConfig(SYSCFG_ETH_MediaInterface_RMII);#endif#ifdef MII_MODE /* Mode MII with STM324xx-EVAL  */  /* Configure PA1, PA2 and PA7 */  GPIO_InitStructure.GPIO_Pin       =GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_7;GPIO_InitStructure.GPIO_Speed  =GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_Mode       =GPIO_Mode_AF;  GPIO_InitStructure.GPIO_OType =GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd       =GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOA, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource1,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7,GPIO_AF_ETH);  /* Configure PB5 and PB8 */  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_5 | GPIO_Pin_8;  GPIO_Init(GPIOB, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOB, GPIO_PinSource5,GPIO_AF_ETH);   GPIO_PinAFConfig(GPIOB, GPIO_PinSource8,GPIO_AF_ETH);  /* Configure PC1, PC2, PC3, PC4 and PC5 */  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;  GPIO_Init(GPIOC, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource1,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource2, GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource3,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource4,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource5,GPIO_AF_ETH);                              /* Configure PG11, PG14 and PG13 */  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_11| GPIO_Pin_13 | GPIO_Pin_14;  GPIO_Init(GPIOG, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOG, GPIO_PinSource11,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOG, GPIO_PinSource13,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOG, GPIO_PinSource14,GPIO_AF_ETH);  /* Configure PH2, PH3, PH6, PH7 */  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_6 | GPIO_Pin_7;  GPIO_Init(GPIOH, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOH, GPIO_PinSource2,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOH, GPIO_PinSource3,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOH, GPIO_PinSource6,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOH, GPIO_PinSource7,GPIO_AF_ETH);  /* Configure PI10 */  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_10;  GPIO_Init(GPIOI, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOI, GPIO_PinSource10,GPIO_AF_ETH);#elif defined RMII_MODE  /* Mode RMII withSTM324xx-EVAL */  /* Configure PA1, PA2 and PA7 */  GPIO_InitStructure.GPIO_Pin    = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_7;  GPIO_InitStructure.GPIO_Speed  =GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF;  GPIO_InitStructure.GPIO_OType =GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOA, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource1,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource2,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7,GPIO_AF_ETH); /* Configure PC1, PC4 and PC5 */  GPIO_InitStructure.GPIO_Pin =GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5;  GPIO_Init(GPIOC, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource1,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource4,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOC, GPIO_PinSource5,GPIO_AF_ETH);  /* Configure PG11, PG14 and PG13 */  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_11| GPIO_Pin_13 | GPIO_Pin_14;  GPIO_Init(GPIOG, &GPIO_InitStructure);  GPIO_PinAFConfig(GPIOG, GPIO_PinSource11,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOG, GPIO_PinSource13,GPIO_AF_ETH);  GPIO_PinAFConfig(GPIOG, GPIO_PinSource14,GPIO_AF_ETH);         /* Configure PD3 */  GPIO_InitStructure.GPIO_Pin    = GPIO_Pin_3 ;GPIO_InitStructure.GPIO_Speed =GPIO_Speed_100MHz;  GPIO_InitStructure.GPIO_Mode =GPIO_Mode_OUT;  GPIO_InitStructure.GPIO_OType =GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd =GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOD,&GPIO_InitStructure);          LAN8720A_RST_PIN_RESET;Delay(50);LAN8720A_RST_PIN_SET;ETHERNET_NVICConfiguration();#endif}    static void ETH_MACDMA_Config(void)    {    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_ETH_MAC | RCC_AHB1Periph_ETH_MAC_Tx |                      RCC_AHB1Periph_ETH_MAC_Rx, ENABLE);       ETH_DeInit();       ETH_SoftwareReset();       while(ETH_GetSoftwareResetStatus() == SET);    ETH_StructInit(&ETH_InitStructure);  /*------------------------ MAC  -----------------------------------*/    ETH_InitStructure.ETH_AutoNegotiation = ETH_AutoNegotiation_Enable;    ETH_InitStructure.ETH_LoopbackMode                         =ETH_LoopbackMode_Disable;    ETH_InitStructure.ETH_RetryTransmission       =ETH_RetryTransmission_Disable;    ETH_InitStructure.ETH_AutomaticPadCRCStrip  = ETH_AutomaticPadCRCStrip_Disable;       ETH_InitStructure.ETH_ReceiveAll                            =ETH_ReceiveAll_Disable;    ETH_InitStructure.ETH_BroadcastFramesReception  = ETH_BroadcastFramesReception_Enable;    ETH_InitStructure.ETH_PromiscuousMode          =ETH_PromiscuousMode_Disable;       ETH_InitStructure.ETH_MulticastFramesFilter= ETH_MulticastFramesFilter_Perfect;    ETH_InitStructure.ETH_UnicastFramesFilter    =ETH_UnicastFramesFilter_Perfect;    #ifdef CHECKSUM_BY_HARDWARE    ETH_InitStructure.ETH_ChecksumOffload = ETH_ChecksumOffload_Enable;    #endif  /*------------------------ DMA  -----------------------------------*/       ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame =ETH_DropTCPIPChecksumErrorFrame_Enable;    ETH_InitStructure.ETH_ReceiveStoreForward                   =ETH_ReceiveStoreForward_Enable;    ETH_InitStructure.ETH_TransmitStoreForward                = ETH_TransmitStoreForward_Enable;    ETH_InitStructure.ETH_ForwardErrorFrames                         =ETH_ForwardErrorFrames_Disable;    ETH_InitStructure.ETH_ForwardUndersizedGoodFrames =ETH_ForwardUndersizedGoodFrames_Disable;    ETH_InitStructure.ETH_SecondFrameOperate =ETH_SecondFrameOperate_Enable;    ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;       ETH_InitStructure.ETH_FixedBurst                      = ETH_FixedBurst_Enable;    ETH_InitStructure.ETH_RxDMABurstLength          =ETH_RxDMABurstLength_32Beat;    ETH_InitStructure.ETH_TxDMABurstLength          =ETH_TxDMABurstLength_32Beat;    ETH_InitStructure.ETH_DMAArbitration                =ETH_DMAArbitration_RoundRobin_RxTx_2_1;       EthStatus =ETH_Init(&ETH_InitStructure, LAN8720A_PHY_ADDRESS);    if(EthStatus==ETH_SUCCESS)    {          ETH_DMAITConfig(ETH_DMA_IT_NIS|ETH_DMA_IT_R,ENABLE);       }    } void LwIP_Init(void){  struct ip_addr ipaddr;  struct ip_addr netmask;  struct ip_addr gw;#ifndef USE_DHCP  uint8_t iptab[4] = {0};  uint8_t iptxt[20];#endif  mem_init();  memp_init(); #ifdef USE_DHCP  ipaddr.addr = 0;  netmask.addr = 0;  gw.addr = 0;#else  IP4_ADDR(&ipaddr, IP_ADDR0,IP_ADDR1, IP_ADDR2, IP_ADDR3);  IP4_ADDR(&netmask,NETMASK_ADDR0, NETMASK_ADDR1 , NETMASK_ADDR2, NETMASK_ADDR3);  IP4_ADDR(&gw, GW_ADDR0,GW_ADDR1, GW_ADDR2, GW_ADDR3);#endif     netif_add(&gnetif, &ipaddr,&netmask, &gw, NULL, &ethernetif_init, &ethernet_input);   netif_set_default(&gnetif);   if (EthStatus == (ETH_INIT_FLAG |ETH_LINK_FLAG))  { gnetif.flags |=NETIF_FLAG_LINK_UP; netif_set_up(&gnetif);#ifdef USE_DHCP DHCP_state = DHCP_START;#else #endif /* USE_DHCP */  }  else  { netif_set_down(&gnetif);#ifdef USE_DHCP DHCP_state = DHCP_LINK_DOWN;#endif /* USE_DHCP */  } //netif_set_link_callback(&gnetif, ETH_link_callback);    } 5.调试过程    a)能正常进行LAN8720A寄存器的读写操作；    b)各个功能模块初始化通过，并去到主程序大循环：    while (1)    {          LwIP_Periodic_Handle(LocalTime);    } 6.调试问题    a) DHCP_state值为2，即未能完成DHCP功能；    b)程序过一段时间进入汇编死循环（如下红 {MOD}标记）：             BusFault_Handler:0x08000188 F8DFD00C  LDR.W       sp,[pc,#12]  ; @0x08000198             _main_scatterload:0x0800018C F000F866  BL.W       __scatterload (0x0800025C)             __main_after_scatterload:0x08000190 4800    LDR       r0,[pc,#0]  ; @0x080001940x08000192 4700    BX          r00x08000194 32D9    DCW       0x32D90x08000196 0800    DCW       0x0800             __rt_final_cpp:0x08000198 8200    DCW       0x82000x0800019A 2000    DCW       0x2000 192:                LDR    R0, =SystemInit 0x0800019C 4806    LDR       r0,[pc,#24]  ; @0x080001B8 193:                BLX    R0 0x0800019E 4780    BLX       r0 194:                LDR    R0, =__main 0x080001A0 4806    LDR       r0,[pc,#24]  ; @0x080001BC 195:                BX    R0 196:                ENDP 197:    198: ; Dummy Exception Handlers (infiniteloops which can be modified) 199:    200: NMI_Handler    PROC 201:             EXPORT  NMI_Handler             [WEAK] 0x080001A2 4700    BX          r0 202:             B    . 203:             ENDP 204: HardFault_Handler 205:             PROC 206:             EXPORT  HardFault_Handler       [WEAK] 0x080001A4 E7FE    B          NMI_Handler (0x080001A4) 207:             B    . 208:             ENDP 209: MemManage_Handler 210:             PROC 211:             EXPORT  MemManage_Handler       [WEAK] 0x080001A6 E7FE    B          HardFault_Handler (0x080001A6) 212:             B    . 213:             ENDP 214: BusFault_Handler 215:             PROC 216:             EXPORT  BusFault_Handler       [WEAK] 0x080001A8 E7FE    B          MemManage_Handler (0x080001A8) 217:             B    . 218:             ENDP 219: UsageFault_Handler 220:             PROC 221:             EXPORT  UsageFault_Handler       [WEAK] 0x080001AA E7FE    B          BusFault_Handler (0x080001AA) 222:             B    . 223:             ENDP 224: SVC_Handler    PROC 225:             EXPORT  SVC_Handler             [WEAK] 0x080001AC E7FE    B          UsageFault_Handler (0x080001AC) 226:             B    . 227:             ENDP 228: DebugMon_Handler 229:             PROC 230:             EXPORT  DebugMon_Handler       [WEAK] 0x080001AE E7FE    B          SVC_Handler (0x080001AE) 231:             B    . 232:             ENDP 233: PendSV_Handler  PROC 234:             EXPORT  PendSV_Handler          [WEAK] 0x080001B0 E7FE    B          DebugMon_Handler (0x080001B0) 235:             B    . 236:             ENDP 237: SysTick_Handler PROC 238:             EXPORT  SysTick_Handler          [WEAK] 0x080001B2 E7FE    B          PendSV_Handler (0x080001B2) 239:             B    . 0x080001B4 E7FE    B          SysTick_Handler (0x080001B4) 410:             B    . 0x080001B6 E7FE    B          Default_Handler (0x080001B6)0x080001B8 1115    DCW       0x11150x080001BA 0800    DCW       0x08000x080001BC 0189    DCW       0x01890x080001BE 0800    DCW       0x08000x080001C0 EA400301  ORR       r3,r0,r10x080001C4 079B    LSLS       r3,r3,#300x080001C6 D003    BEQ       0x080001D00x080001C8 E009    B          0x080001DE0x080001CA C908    LDM       r1!,{r3}0x080001CC 1F12    SUBS       r2,r2,#40x080001CE C008    STM       r0!,{r3}0x080001D0 2A04    CMP       r2,#0x040x080001D2 D2FA    BCS       0x080001CA0x080001D4 E003    B          0x080001DE0x080001D6 F8113B01  LDRB       r3,[r1],#0x010x080001DA F8003B01  STRB       r3,[r0],#0x010x080001DE 1E52    SUBS       r2,r2,#10x080001E0 D2F9    BCS       0x080001D60x080001E2 4770    BX          lr0x080001E4 B2D2    UXTB       r2,r20x080001E6 E001    B          0x080001EC0x080001E8 F8002B01  STRB       r2,[r0],#0x010x080001EC 1E49    SUBS       r1,r1,#10x080001EE D2FB    BCS       0x080001E80x080001F0 4770    BX          lr0x080001F2 2200    MOVS       r2,#0x000x080001F4 E7F6    B          __aeabi_memset (0x080001E4)0x080001F6 B510    PUSH       {r4,lr}0x080001F8 4613    MOV       r3,r20x080001FA 460A    MOV       r2,r10x080001FC 4604    MOV       r4,r00x080001FE 4619    MOV       r1,r30x08000200 F7FFFFF0  BL.W       __aeabi_memset (0x080001E4)0x08000204 4620    MOV       r0,r40x08000206 BD10    POP       {r4,pc}0x08000208 1C42    ADDS       r2,r0,#10x0800020A F8101B01  LDRB       r1,[r0],#0x010x0800020E 2900    CMP       r1,#0x000x08000210 D1FB    BNE       0x0800020A0x08000212 1A80    SUBS       r0,r0,r20x08000214 4770    BX          lr0x08000216 B530    PUSH       {r4-r5,lr}0x08000218 4604    MOV       r4,r00x0800021A 2000    MOVS       r0,#0x000x0800021C 4603    MOV       r3,r00x0800021E E000    B          0x080002220x08000220 1C5B    ADDS       r3,r3,#10x08000222 4293    CMP       r3,r20x08000224 D203    BCS       0x0800022E0x08000226 5CE0    LDRB       r0,[r4,r3]0x08000228 5CCD    LDRB       r5,[r1,r3]0x0800022A 1B40    SUBS       r0,r0,r50x0800022C D0F8    BEQ       0x080002200x0800022E BD30    POP       {r4-r5,pc}0x08000230 B530    PUSH       {r4-r5,lr}0x08000232 460B    MOV       r3,r10x08000234 4601    MOV       r1,r00x08000236 2000    MOVS       r0,#0x000x08000238 2220    MOVS       r2,#0x200x0800023A 2401    MOVS       r4,#0x010x0800023C E009    B          0x080002520x0800023E FA21F502  LSR       r5,r1,r20x08000242 429D    CMP       r5,r30x08000244 D305    BCC       0x080002520x08000246 FA03F502  LSL       r5,r3,r20x0800024A 1B49    SUBS       r1,r1,r50x0800024C FA04F502  LSL       r5,r4,r20x08000250 4428    ADD       r0,r0,r50x08000252 1E15    SUBS       r5,r2,#00x08000254 F1A20201  SUB       r2,r2,#0x010x08000258 DCF1    BGT       0x0800023E0x0800025A BD30    POP       {r4-r5,pc}0x0800025C 4C06    LDR       r4,[pc,#24]  ; @0x080002780x0800025E 4D07    LDR       r5,[pc,#28]  ; @0x0800027C0x08000260 E006    B          0x080002700x08000262 68E0    LDR       r0,[r4,#0x0C]0x08000264 F0400301  ORR       r3,r0,#0x010x08000268 E8940007  LDM       r4,{r0-r2}0x0800026C 4798    BLX       r30x0800026E 3410    ADDS       r4,r4,#0x100x08000270 42AC    CMP       r4,r50x08000272 D3F6    BCC       0x080002620x08000274 F7FFFF8C  BL.W       __main_after_scatterload (0x08000190)0x08000278 6184    DCW       0x61840x0800027A 0800    DCW       0x08000x0800027C 61A4    DCW       0x61A40x0800027E 0800    DCW       0x0800 90: while (1) 0x08000280 E7FE    B          BusFault_Handler (0x08000280) 115: } 116:    117: /** 118: * @brief  This functionhandles SysTick Handler. 119: * @param  None 120: * @retval None 121: */ 122: void SysTick_Handler(void) 123: { 124: /* Update the LocalTime byadding SYSTEMTICK_PERIOD_MS each SysTick interrupt */ 125: Time_Update(); 126: } 7.问题请教 a)从死循环执行代码是否可以判别是何原因造成？ b)DHCP有哪些关键的参数需要特别注意？ c)第一次接触DHCP，实验数日仍未找出原因，还请大家多多指教，谢谢！（附上源程序）

STM32F4x7_ETH_LwIP_V1.1.0(改版可操作LAN8720A)试验版.rar (2.56 MB, 下载次数: 87) 2017-8-16 18:05 上传点击文件名下载附件

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5条回答

1楼-- · 2019-07-20 11:22

使用网络抓包工具Wireshark，分别运行两个程序均能获取如下信息：
Source Destination Protocol Length Info
02:00:00:00:00:00 Broadcast ARP 60 Gratuitous ARP for 0.0.0.0 (Request)
0.0.0.0 255.255.255.255 DHCP 350 DHCP Discover - Transaction ID 0xabcd0001
Tp-LinkT_9a:c0:92 Broadcast ARP 60 Who has 192.168.1.180? Tell 192.168.1.1
0.0.0.0 255.255.255.255 DHCP 350 DHCP Request  - Transaction ID 0xabcd0002
02:00:00:00:00:00 Broadcast ARP 60 Who has 192.168.1.180? Tell 0.0.0.0
02:00:00:00:00:00 Broadcast ARP 60 Who has 192.168.1.180? Tell 0.0.0.0
数据说明程序已经发出DHCP请求，并得到回应，而无法DHCP的原因可能是接收数据有问题，单步调试程序，发现中断程序频繁，并可能是由此而引发死循环，因接收数据处理程序相对还是比较复杂的，不宜放置在中断中处理，所以对程序进行如下修改：
stm32f4x7_eth_bsp.c 中的函数 static void ETH_MACDMA_Config(void) 注释使能中断语句：
  if(EthStatus==ETH_SUCCESS)
  {
//ETH_DMAITConfig(ETH_DMA_IT_NIS|ETH_DMA_IT_R,ENABLE);
  }
main.c主函数中使用查询方式获取数据
  while (1)
  {
if (ETH_CheckFrameReceived())
{
   LwIP_Pkt_Handle();
}
LwIP_Periodic_Handle(LocalTime);
  }
更改此两处，DHCP成功。

2楼-- · 2019-07-20 12:20

精彩回答 2 元偷偷看……

3楼-- · 2019-07-20 16:59

zuozhongkai 发表于 2017-8-16 20:34
探索者的网络例程就默认支持DHCP！

是的，探索者的例程能够进行DHCP，但是自己建立的工程无法完成DHCP，所以请教。

4楼-- · 2019-07-20 18:55

补充说明，死循环内容为：
0x080001D6 F8113B01 LDRB       r3,[r1],#0x01
0x080001DA F8003B01 STRB       r3,[r0],#0x01
0x080001DE 1E52          SUBS       r2,r2,#1
0x080001E0  D2F9       BCS          0x080001D6

5楼-- · 2019-07-20 22:07

精彩回答 2 元偷偷看……

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