STM32F407 Discovery + Ethernet PHY Example?

[Dubbie]

Hi,

I have made an Ethernet PHY board based on the LAN8720A chip.
I have spent a long time searching but I can't find any example code yet to test it with ChibiOS.

My goal is to get a simple webserver working.

Obviously I will have to set the right pins somehow for the RMII interface, but I am a little stuck with where to go next.
I have got the basic blinky demo running on the board.

This is my first project with ChibiOS so I am a little green. Any advice will be gratefully received.

Thanks,

R

[steved]

Look at the Olimex E407 demo - you'll need to match some of the clock settings in mcuconf.h to the Discovery.

Or the demos for any of the 32F4xx nucleo/discovery boards which have Ethernet (e.g. Nucleo144-F429)

Might even be easier to swap your Discovery for one of these boards.

[Dubbie]

Thanks Steved. Will try that.

I do want to get my own breakout board working because it will become part of a larger custom board once I get it all working. I just wanted to attack the Ethernet stuff alone with a known good mcu.

R

[Dubbie]

Hi,

So just a small update.
I fiddled around a bit with the Olimax project.
I mainly changed the clock settings to run from the 8Mhz HSE clock with a SYSCLK at 168Mhz.

It built fine and I flashed it onto the board.

it seems to crap out during the macInit() and I'm not 100% sure if there is something else I need to configure, or if I have a hardware fault.

My phy is connected to the appropriate pins and I am generating a good quality 50mhz clock on it that comes to the STM discovery board.

It kinda looks to me like something is going wrong determining the PHY address. I have tried with and without a pullup on the XER/PHYAD0 pin.
The PHY address register contains 0x1E. so i guess it tried all the adresses with no success.

if there is nothing software/wise that I have obviously missed, that anyone here can see, I will break out the scope and check everything electrically.
Tomorrow I will order a known good PHY board as well

Thanks.

[Giovanni]

Hi,

Have you created board files for your board? the MAC driver can hang if ethernet-related pins are not properly initialized.

You need to define a function for all pins in your board. The pins you are using could also have conflicts with on-board devices, verify on the schematic.

Giovanni

[Dubbie]

I just used the Olimax board file because I figure it is pretty much the same and I don’t care about any of the other pins functions at this stage. I just manually edited the clock setup and the voltage.

If you think it’s better, I will generate new board files.

[Giovanni]

You need to program the Ethernet pins to the appropriate alternate mode, make sure there are no conflicts and take care that the PHY receives the correct clock.

Giovanni

[Dubbie]

Thanks very much for the hand holding.
I will try tomorrow and report how I get on.

[Dubbie]

I got this all working now.

Thanks for the assistance.