Posted on April 13, 2014 at 08:57yeah，i use motherboard refrence as
http://www.wvshare.com/product/Open407V-D-Standard.htmmainboard is stmf4-discovery;and my project file is open407-freerots.ioc
then i add some breakpoints use keil with ST-LINK debug and find it stops at the func as follows
void netif_set_up(struct netif *netif)
{
if (!(netif->flags & NETIF_FLAG_UP)) {
netif->flags |= NETIF_FLAG_UP;
#if LWIP_SNMP
snmp_get_sysuptime(&netif->ts);
#endif /* LWIP_SNMP */
NETIF_STATUS_CALLBACK(netif);
if (netif->flags & NETIF_FLAG_LINK_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 */
}
}
}
and then i click stop it jumps to
configASSERT( ( portAIRCR_REG & portPRIORITY_GROUP_MASK ) <= ulMaxPRIGROUPValue );
