Re: [lwip-users] change PHY and strange behaviour

[Noam weissman]

Hi,

First of all DP83484 has a few versions. I worked with the DP83484M and
DP83484C. I also worked with Marvel 
Switch 88E6071

I found that all standard IEEE compliant PHY's have 32 registers and the
general purpose code supplied by ST 
should work with all of them. However when I triad modifying the ST code
to work with the switch I found out 
that ST code does not work properly. At least the code I had at that
time...

You may have some settings issues but most probably you have a hardware
problem. 

If you think your hardware is OK check that the PHY is reset properly.
ST code uses a fixed time delay that may 
not be sufficient. Also check that auto negotiation and other parameters
are set properly.

After you check everything from the software and still see problems you
need to check that hardware is OK.

Good luck,
Noam.



-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of pcu
Sent: Thursday, June 12, 2014 6:20 PM
To: address@hidden
Subject: [lwip-users] change PHY and strange behaviour

Hello,

I changed my PHY from DP83848 in MII to LAN8720 in RMII. Initialisation
in code seems correct, and signals also (REFCLOCK...) But I got a
strange ping answer starts at 500ms, decrease to 1ms and roll again.
I test my webserver and it is also very slow.

<http://lwip.100.n7.nabble.com/file/n22776/Capture.gif>
An Idea, or where to look?
I think it is a detail but what...

I'm on STM32F4 + Freertos.
Thank you.



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