Re: [lwip-users] lwip-users Digest, Vol 119, Issue 1

[Andrea Coccon]

Hi Claudius,

I'm writing to ask if you followed your intention to write a MAC driver for the STM32.

Browsing through the forums I can see a lot of new projects based on this MCU but everybody complains about badly written drivers..

Bye,

Andrea

From: Claudius Zingerli <address@hidden>
To: Mailing list for lwIP users <address@hidden>
Cc: 
Date: Mon, 01 Jul 2013 09:56:08 +0200
Subject: Re: [lwip-users] Low Iperf performance of lwip 1.4.1 on STM32 and FreeRTOS
Hi ella and all,

Some progress here: I receive a lot of CRC & Align errors (MMC counters of STM32). At least there is /some/ correlation between these errors and LWIP behaving strangely (if there is an increase in the MMC counters, LwIP gets into trouble, if there is none, LwIP mostly works fine). This may further be related to the usage of RMII between the MAC and PHY and creating the RMII-Clock with the STM32-PLL. Datasheet jitter and precision should be OK for the PHY, but this might not be the cleanest solution (There is some hint in the datasheet that good guys should source the RMII clock by bypassing the PLL). So in a next step, I'm going to use a dedicated 50MHz oscillator to clock the PHY and MCU.
On the software-side: An own implementation of the MAC driver is on the way. Could probably be open sourced if there is some interest.

Claudius