add support for single pair Ethernet PHY (IDFGH-9431)

[gkasprow]

Is your feature request related to a problem?

10Base-T1S becomes more and more popular as a CAN replacement in industry and automotive.
It's an ideal solution for short-range IoT networks, epecially where 2.4GHz band is overcorowded

Describe the solution you'd like.

Support for either LAN8670 PHY or NCN26010 MAC+PHY

Describe alternatives you've considered.

Of course standard Ethernet works fine but it requires switch and a lot of cabling if one needs to build a sensor network with let's say 16 devices.

Additional context.

Here is the use case - a photonic sensor where SPE is used for both data transfer and power
sinara-hw/DiPho#18

[kostaond]

Hi @gkasprow, thanks for submitting the feature request. It really could be interesting to support 10Base-T1S. Could you please check this article first? Would it be applicable to 10Base-T1S PHY chips?

[gkasprow]

It looks so. These chips have a standard RMII interface. Only registers differ.

[gkasprow]

I have LAN8670 eval in my lab as well as USB dongle
we are curently developing open source PoE router based on RPI 0.

[morgana2313]

@gkasprow: we want to use the 10BASE-T1S LAN8670 LAN8651 with esp-idf. Is there any code available from sinara-hw/DiPho#18 , from which we can learn how to setup the proper chip registers ?

We have the EVB-LAN8670-USB working with Linux raspberry pi.

[gkasprow]

We were using NCN26010 with STM32 eval board.
There is example code for STM32 and other platforms provided by Onsemi
https://www.onsemi.com/pub/Collateral/EXAMPLE%20SOFTWARE:%20STM32%20IMPLEMENTATION%20.ZIP

[morgana2313]

We got an ESP32 + LAN8551 replying to ping packets send by the RPi with the LAN8650/1 OPEN Alliance TC6 Driver. It gives ping times of ±50ms. Between two RPi's the SPE ping times are ±1ms.

What would be normal ping times for a 10Base-T1S network?

[gkasprow]

It depends on how the ICMP stack is implemented. Did you use polling or interrupts?
With interrupts, it should be a much lower value. If you use polling, 50ms could be possible.

[baybal]

Hi @gkasprow, thanks for submitting the feature request. It really could be interesting to support 10Base-T1S. Could you please check this article first? Would it be applicable to 10Base-T1S PHY chips?

Current chip revisions of LAN867* have buggy PLCA. I was recommended NCN26000, but it's nowhere to be found.

[gkasprow]

NCN26010 chips are easily available now. Availability issue was a few months ago.
Devkits are also available .

[baybal]

NCN26010 chips are easily available now. Availability issue was a few months ago. Devkits are also available .

NCN26010 is SPI and NCN26000 is MII. You can only realistically use it with a much higher end MCU, while RMII is a lingua franca for ethernet in microcontrollers, including sub $1 ones.

[gkasprow]

Oh,I didn't know Onsemi has RMII version. I thought you made a typoo. Anyway, SPI is better because RMII consumes most of ESP32 IOs.

[baybal]

Oh,I didn't know Onsemi has RMII version. I thought you made a typoo. Anyway, SPI is better because RMII consumes most of ESP32 IOs.

But then you lose all the power & performance benefit of the onboard MAC

[gkasprow]

We arr limited to 10Mbit anyway so that is not critical.

[kostaond]

espressif/esp-eth-drivers#19

[Indastri]

The fix was merged. Closing the issue. If there will be any more problems do not hesitate to reopen this or create a new issue.
Cheers!