Re: [lwip-users] tcp connection problem

[Janusz U.]

> > I am using FreeRTOS  4.1.0 - OS, lwIP 1.1.1 and ppp. PPP, IP, ICMP (ping) 
> > work fine and is stable I hope.
> > I have problem with TCP. I make http server. Ather telnet ip 80 
> > connection is made (TCP_DEBUG: TCP connection established ...->80) and 
> > then OS crashes. I did analise => OS is halt on TCP_EVENT_ACCEPT(pcb, 
> > ERR_OK, err); in tcp_in.c (tcp_process). Have you any ideas?
>
> Sounds like it's having some problem dereferencing the pointer to the
> accept callback.  This callback is called whenever a new connection is
> established.
>
> Kieran


hi,

It is a little accidental. In special moments (rarely) system crashes after 
returning from TCP_EVENT_ACCEPT (I do not insert line defining 
LWIP_CALLBACK_API and LWIP_EVENT_API in lwipopt.h, only opt.h define that). 
Debug screen is stopped on printf before TCP_EVENT_ACCEPT and sometimes on 
printf behind until .
I am suspecting a stack (although I defined huge stacks, every task has 1200 
bytes, and memory heap for FreeRTOS, 24000 bytes) or something similar. I 
think it is not caused by PPP because IP/ICMP is really stable. Everything 
is ported into ARM7 at91sam7s256 (256kB FLASH, 64kB RAM).

Janusz