Configuring an Ethernet PHY (Davicom DM9161A)

[panpwr]

Hello,

I am trying to use the MQX-supplied driver for my Ethernet PHY (assembled on my custom board), but I can't get it to work (MQX 3.8.0).

I've modified the following:

1. init_enet.c:

const ENET_IF_STRUCT ENET_0 = {

    &MACNET_IF,

    &phy_dm9161_IF,     /*<=== instead of &phy_ksz8041_IF*/

    MACNET_DEVICE_0,

    MACNET_DEVICE_0,

    BSP_ENET0_PHY_ADDR,

    BSP_ENET0_PHY_MII_SPEED

};

2. init_enet.c:

#include "phy_dm9161.h"  /*<=== instead #include "phy_ksz8041.h"*/

3. Recompiled BSP & RTCS libraries.

Now, the problem:

When performing phy_dm9161_init(), the Status Register reading (&phy_status) always returns 0x0, as if it has not been read at all (The PHY's status register default values are definitely different from 0x0).... So I thought checking K60 physical lines, to see if the request is transmitted at all:

When I check the MDIO I/O pin, I don't see anything that is transmitted to line. The MDC line shows accurate clocks at ~2.5MHz (as required by spec).

What am I doing wrong? I don't believe that it is a PHY configuration problem since no instruction is transmitted from K60 towards the PHy.

HELP! :smileyhappy:

Thank you.

[panpwr]

OK, found some problems HW-related problems (following this post: Re: MCF52259 &amp; DP83640):

1. We've added a pull up resistor to the MDIO pin (though it was not mandatory according to the PHY's spec) - then we've started to see communication over the line. However, it was a bit noisy and inaccurate (when trying to make TCP communication).

2. We've added external trace, bypassing our custom's board traces - now it works well (probably due to a combination of problematic trace with a weak pull up) - Hurray! :smileyhappy:.

Now, for another related question:

How can I configure the internal pull up resistor for the MDIO line (PTB0) using MQX functionality? I am trying to save here the external pull-up.

Thanks!

Lior.

[c0170]

Hello,

I have noticed just this one recently, to configure internall pull up, there's lwgpio_set_attribute function.

Regards,

MartinK

[panpwr · Accepted solution]

We've tried to do so, but it didn't quite help... We've added an external pull up and it all seems stable now.

Thank you ! :smileyhappy: