STM32H7 PTP NETXDUO

[FB__1]

Hello,

 

I would like to know if this PTP client example from Netxduo can be used on an STM32H723 MCU: 

https://github.com/eclipse-threadx/rtos-docs/blob/main/rtos-docs/netx-duo/netx-duo-ptp-client/chapter1.md

 

Another MCU, the STM32N6 has this implementation here: https://github.com/STMicroelectronics/STM32CubeN6/tree/main/Projects/NUCLEO-N657X0-Q/Applications/NetXDuo/Nx_PTP_Client

 

I wanted to confirm if the STM32H723 does support that example because i am looking at https://github.com/STMicroelectronics/x-cube-azrtos-h7/tree/main/Projects and I cannot find any ...

 

Thank you.

[STackPointer64]

Hello @FB__1, and welcome to ST Community,

Currently, the only available PTP example is, as you mentioned, for the STM32N6. Regarding your question about STM32H723 support, I cannot confirm it will work immediately. However, since the STM32H723 does support PTP, with some adjustments, you should be able to adapt the example to run on that MCU. Additionally, I recommend searching the community for other threads on the same topic.

Best regards,

 

[FB__1]

As another option, will Zephyr RTOS on the STM32H723 work out of the box for the PTP example ?

https://docs.zephyrproject.org/latest/boards/st/nucleo_h723zg/doc/index.html

Thank you.

[Pavel A.]

It looks like Zephyr supports PTP on STM32. You're welcome to try it.

https://github.com/zephyrproject-rtos/zephyr/blob/bfd2ac78ad50dfa7391b122a410ea314b6e35a91/drivers/ethernet/Kconfig.stm32_hal#L85

 

[STackPointer64]

Hello @FB__1 ,

The adjustments typically involve porting hardware-specific configurations, such as clock settings for PTP, Ethernet peripheral pinout configuration, and adapting the NetXDuo middleware to the STM32H7. I recommend reviewing the STM32H7 reference manual along with the NetXDuo PTP guide for detailed information.

Best regards,

[LCE]

Interesting!

 

@STackPointer64 , could you please show us where to find the following:

- STM32 ETH PTP setup (including HW offload if used)

- PTP register writing (clock update, addend change)

 

@FB__1 

- Do you use PTP via UDP or "pure" Ethernet? If Ethernet, does it use HW offload?

- How is PTP sync quality?

- How is sync quality if ethernet traffic goes up?

[STackPointer64]

Hello @LCE,
The STM32 ETH PTP setup can be found in the MX_ETH_Init(...) function. Inside, you will find a PTP struct declaration used to configure the feature, followed by a call to ETH_PTP_SetConfig(...) to apply the configuration to the appropriate registers. For clock updates and addend changes, there are dedicated functions such as HAL_ETH_PTP_AddTimeOffset(...) and HAL_ETH_PTP_AddendUpdate(...).

Best regards,

[LCE]

N6 ETH HAL driver:

 -@- The PTP offload feature is not supported in this driver.

 

What a pity. :(

The HW feature that was never used anywhere...

BTW, as many users (F4, F7, H7) have been asking for PTP examples for years, it almost feels like a "low kick" (nicely said) that ST is sneaking it into N6.

[Pavel A.]

So have you checked zephyr or STLinux?

 

[LCE]

Yes, some time ago.

But since my own experiments with PTP offload (sync quality decreasing with ethernet traffic, compared to stable PTPd) I skipped it.

[WTieg.1]

I read the code of STM32N6，netxduo ptpclient.c and found the ptp implentmation is base on software clock.

Not base on ethernet ptp registers.

[FB__1]

I am satisfied with the NETXDUO PTP performance. I got very good precision below 1usec with the NETXDUO PTP client on the STM32N6 and ptp4l.

I used :

//PPS control register:

TRGTMODSEL[1:0] = 00b -> Interrupt-only mode

PPSEN0 = 1 to enable PPS channel 0