[lwip-users] board hangs using dhcp

[Andrea Visinoni]

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