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Re: [lwip-users] Reg: data transfer to FTP site with GPRS modem

From: S. Ali Tokmen
Subject: Re: [lwip-users] Reg: data transfer to FTP site with GPRS modem
Date: Thu, 13 Sep 2007 18:55:14 +0200

Are you sure lwIP is provided with enough memory? In Ethernet mode I know there are two places where you supply memory:
  • The ADI_ETHER_CMD_SUPPLY_MEM configuration call
  • init_stack's third parameter
Normally a junk value indicates that some buffer got overflowed. Perhaps you can also check if VDK has enough semaphores allocated.
I think it's an overflow issue.

S. Ali Tokmen
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----- Original Message -----
Sent: Thursday, September 13, 2007 12:54 PM
Subject: RE: [lwip-users] Reg: data transfer to FTP site with GPRS modem



This is continuation of my previous post.


What I observed is, after 26packtes, lwip_cheksum function is called. Inside this function, pbuf’s next pointer is taken, but this next pointer is pointing to some junk value (either corrupted or not initiliazed), so it goes to exception handler.


Can you plz suggest any method, to further debug this issue.



Nandakumar KS

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