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Re: [lwip-users] Function send

From: Martin Persich
Subject: Re: [lwip-users] Function send
Date: Fri, 23 Apr 2010 15:24:27 +0200

Hi Oscar,
there is not buffer for outgoing pckets in LwIP, I think. LwIP "send" function only store packet data to MACB DMA buffer "pcTxBuffer" (file "macb.c", function "lMACBSend") - if there is free descriptor "xTxDescriptors[]", in other case function waiting for release - and then return. Transmitting process to ethernet line is asynchronous and is controlled by MACB unit & DMA in AVR32 and depend on type of connected ethernet devices (hub / switch, half duplex / full duplex,  ...)
Best Regards
Martin Persich
----- Original Message -----
From: Oscar F
Sent: Friday, April 23, 2010 1:47 PM
Subject: [lwip-users] Function send

Hello everybody!!

I´m using EVK1100 with FreeRTOS and lwip, and i would like to know this question.

When i called  the send function, is the packet sent to the ethernet line or this is queued and the return say me only that situation?

It´s importan for me to measure the time to proccess the send functions.

Thank you in advance



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