Re: [lwip-users] NETCONN_NOCOPY not sending

[Bill Auerbach]

Hi,

It could also be that the memory is getting reused (overwritten) in the time
from the tcp_write to the time it's actually sent by the Ethernet driver.

Bill

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf
Of Martin Velek
Sent: Thursday, May 16, 2013 5:08 AM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] NETCONN_NOCOPY not sending

Hi,

my crystal ball is telling me that you are using NOCOPY to pass data e.g.
from ROM, STACK, SRAM but the EMAC driver does not provide send buffer (zero
copy) and thus cannot access the ROM, STACK, SRAM area.
This is e.g. case of LPC1788. With NETCONN_COPY, the lwip creates buffers in
the right memory regions.

Could you provide a detailed description of your configuration, like lwip
version, type of  drivers, system, etc?

Best
Martin

On Sun, May 5, 2013 at 10:41 AM, Nikolas Karakotas <address@hidden>
wrote:
> Hi,
>
> Im trying to send data with NETCONN_NOCOPY but I cant get it to work 
> only with NETCONN_COPY.
> What could be causing this problem?
>
> Regards,
> Nick
>
> _______________________________________________
> lwip-users mailing list
> address@hidden
> https://lists.nongnu.org/mailman/listinfo/lwip-users

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