Re: [lwip-users] lwip fails for full duplex communication

[Krzysztof Wesołowski]

On Tue, May 29, 2012 at 10:18 AM, lookwong <address@hidden> wrote:
> I don't think lwip spports full duplex mode.

I do not know what you mean by full duplex, but LwIP works fine for
example echoing data, so the problem is probably in application

Regards,
Krzysztof Wesołowski,
tel. +48 721 337 238

http://www.rainlabs.pl



>
>
> On Tue, May 22, 2012 at 12:36 PM, GICINDIA <address@hidden> wrote:
>>
>>
>> Hello Kieran,
>>
>> Thanx alot for the reply.
>>
>> If no. of pbufs is the issue then, to resolve this problem can i make
>> MEMP_NUM_PBUF = 32?
>>
>> But, i did not understand lwip data transmit logic fully, if possible can
>> u
>> explain it? so that i can be able to implement some other logic for buffer
>> handling at serial side before writing data into pbufs.
>>
>>
>> Regards,
>> Asma.
>>
>>
>>
>> Kieran Mansley wrote:
>> >
>> > It looks to me like you have 16 pbufs, each of size 256 bytes.  Your
>> > TCP_WND is 2048, so you can have 2KB of data received and waiting for
>> > your
>> > application before the other end will stop sending.  Your TCP_SND_BUF is
>> > 6KB, so you can have that much sent by your application waiting to go
>> > onto
>> > the wire.  In total, this makes 8KB of buffering, but you only have
>> > enough
>> > pbufs to hold 4KB (16 * 256).  I think this is why you're running out.
>> >
>> > Kieran
>> > _______________________________________________
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>> >
>> >
>>
>> --
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>>
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