Re: [lwip-users] board hangs using dhcp

[address@hidden]

It seems you are violating threading requirements: calling the netif_* 
and dhcp_* functions from any other thread than the tcpip_thread is not 
allowed! And if the code below *would* run in that thread context, it 
would block RX-packets: the tcpip_thread must process incoming packets 
from its mbox.

If you are running multithreaded, you have to use tcpip_callback to get 
into  the tcpip_thread and call dhcp_start from there. Also, the timer 
functions will get called automatically by the tcpip_thread, so there's 
no need to call them on your own.

Simon


Andrea Visinoni wrote:
> Hi,
> i have a simple webserver task on my custom board (at91sam7x256) using
> freertos and lwip 1.2.0.
> Using static ip i have no problems, but using dhcp my board hangs after
> the very first send (using socket api or netconn_write...same problem).
> The port is open, the connection is accepted, but when i start sending
> data to client in several sends, only the first one succeed.
>
> this is my dhcp start code:
>
> IP4_ADDR(&xIpAddr,0,0,0,0);
> IP4_ADDR(&xNetMast,0,0,0,0);
> IP4_ADDR(&xGateway,0,0,0,0);
>
> netif_add(&EMAC_if,&xIpAddr,&xNetMast,&xGateway, NULL,
> ethernetif_init, tcpip_input);
>
> // make it the default interface
> netif_set_default(&EMAC_if);
>
> // Avvio DHCP
> dhcp_start(&EMAC_if);
>
> // DHCP negotiation
> int mscnt = 0;
> while (EMAC_if.ip_addr.addr == 0)
> {
>       sys_msleep(DHCP_FINE_TIMER_MSECS);
>       dhcp_fine_tmr();
>       mscnt += DHCP_FINE_TIMER_MSECS;
>       if (mscnt>= DHCP_COARSE_TIMER_SECS * 1000)
>       {
>           dhcp_coarse_tmr();
>           mscnt = 0;
>       }
> }
>
> Any hints?
>
> Best regards
> Andrea
>
>
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