stm32:[cubeMX] freeRTOS lwip dhcp IPaddress

[sycinfinity]

Posted on February 19, 2016 at 09:27

Hi everyone. 

I need your's help. 

I use stm32cubemx for init all pins and functions.

and I wonder use FreeRTOS, and LWIP driver. My purpose is create LWIP threads, and do TCP/IP communication to my virtual box's ubuntu system. (TCP, UDP echo server and client.)So, I make IAR project from cubeMX. First time, I didn't use LWIP_DHCP option. at cubeMX's lwip_configuration. Set IP address manually, and my TCP and UDP echo server and client were done very well. ex) Ubuntu(TCP server) <-> board(TCP client) Ubuntu(TCP client) <-> board(TCP server) Ubuntu(UDP server) <-> board(UDP client) Ubuntu(UDP client) <-> board(UDP server)Next, I USE DHCP option. but, it didn't work. So I found why didn't work it. First I looked my iptime  router's setting window. (192.168.1.1) (DHPC server) . But didn't find my board's MAC addr, and IP addr at 'inside network table.' So I look router's system log. And found my board's ip addr. I don't know why It didn't exist at 'inside network table'. But i knew board' ip addr. Anyway, I get my board's ip addr. so do TCP and UDP. but, when i use it server i work good. but, client didn't work.ex) Ubuntu(TCP server) <-> board(TCP client) --> not work. Ubuntu(TCP client) <-> board(TCP server) --> work. Ubuntu(UDP server) <-> board(UDP client) --> not work. Ubuntu(UDP client) <-> board(UDP server) --> work.So, i look my source. And found where my ip addr's saved. at my main(), freeRTOS's kernel start, and in my defaultTask , it call MX_LWIP_Init();, and in this function, /******************************************************************/void MX_LWIP_Init(void){   tcpip_init( NULL, NULL );    ipaddr.addr = 0;  netmask.addr = 0;  gw.addr = 0;    /* add the network interface */  netif_add(&gnetif, &ipaddr, &netmask, &gw, NULL, &ethernetif_init, &tcpip_input);   /*  Registers the default network interface */  netif_set_default(&gnetif);  if (netif_is_link_up(&gnetif))  {    /* When the netif is fully configured this function must be called */    netif_set_up(&gnetif);  }  else  {    /* When the netif link is down this function must be called */       netif_set_down(&gnetif);  }  dhcp_start(&gnetif);}/******************************************************************/'gnetif' is definedd netif.So, go to inside of gnetif, and found my DHCP's client addr are saved at here.gnetif.dhcp->offered_ip_addr.addr;gnetif.dhcp->offered_gw_addr.addr;gnetif.dhcp->offered_sn_mask.addr;So, I add this source at my defaultTask where called MX_LWIP_Init(); like this.  /************************************************************************/void StartDefaultTask(void const * argument){  /* init code for LWIP */  MX_LWIP_Init();    gnetif.ip_addr.addr = gnetif.dhcp->offered_ip_addr.addr;  gnetif.gw.addr = gnetif.dhcp->offered_gw_addr.addr;  gnetif.netmask.addr = gnetif.dhcp->offered_sn_mask.addr;    ~~~~~~~~/************************************************************************/finally, my source are work well. But, I don't convince my solution is right solution. Is it right solution??? eles, Do I mistake when use dhcp configure?? I confused . because, at menual, just I check DHCP option, I could work my source easy.plz anyone tell me why my source can't work. or, tell me exist other right solution?thank you. #freertos #stm32 #lwip #dhcp