Re: [lwip-users] Call tcp_close() out of tcp_recv()-context?

[Abhijith N M]

Hello  All,

I need to implement TCP/IP through lwip stack on AT32UC3A0512.
I tried using the BSD sockets of lwip stack to establish TCP/IP, but I can 
never ping successfully, the connected ATEML EVK1105 board.

Ethernet driver are working perfectly. I think some change needs to be done to 
LWIP stack to create a Socket properly and send data.

Pinging is failing and Data communication is failing. Please let me know a 
solution for this.

Thanks and Regards
Abhijith N.M.
________________________________________
From: address@hidden address@hidden on behalf of address@hidden address@hidden
Sent: 07 September 2015 23:55:15
To: Mailing list for lwIP users
Subject: Re: [lwip-users] Call tcp_close() out of tcp_recv()-context?

Karl Karpfen wrote:
> My question: can I do a tcp_close() from within my_recv() which is
> called in lwIP's receive-context

Yes you can. And the lwIP API allows it.

> (which possibly may be a receive-IRQ)?

No. Unless you take special action to prevent concurrent access to the
lwIP core (i.e. block ETH IRQ when calling lwIP functions from main
loop), receive functions must not be called from ISR. If that is the
case, most often the creator of your lwIP port has done something wrong.
This has been the case for some microcontroller vendor's ports in the past.

Simon

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