About thomas987

thomas987 · 2021-09-28

I've enabled pps-gpio and pps in the kernel config and added the following to the device tree:/{ //... pps{ compatible = "pps-gpio"; gpios = <&gpiod 13 GPIO_PULL_UP>; status = "okay"; }; };but this results in the follo...

thomas987 · 2021-06-29

Hi again,that's how i understood it so far, correct me if i'm wrong:openstlinux on STM32MP1 uses arch_sys_counter as clocksourcecat /sys/devices/system/clocksource/clocksource0/available_clocksource arch_sys_counterwhich also serves as clock source ...

thomas987 · 2021-06-17

Hi,I wanted to ask if there is a possibility to have the same time domain on the M4 and A7 cores?To be a bit more specific: my STM32MP1 board synchronises time over Ethernet using PTP (and that works great!) but now i want to timestamp a digital inpu...

thomas987 · 2021-10-07

Hi,thanks for checking!Yes, indeed, it seems to work now as a kernel module (=m) but fails when i build it into the kernel (=y)Best Regards and thanks for your help!Thomas

thomas987 · 2021-10-01

Hi Oliver,> instead of "NULL" I would expect "pps" instead. (parsing the DT for pps-gpios then extract the gpio pin). the second parameter should only specify the name used for the gpio handle, right? so "pps" would look for "pps-gpios" and NULL shou...

thomas987 · 2021-09-30

Hi,the pps-gpio module is used for pps input -- to measure and timestamp an incoming PPS signal. It actually should work with any GPIO pin but it always fails here:https://github.com/STMicroelectronics/linux/blob/v5.10-stm32mp/drivers/pps/clients/pps...

thomas987 · 2021-06-18

Thanks for this amazing answer!The required precision for the first prototype won't be that hard to reach i guess (talking about <~1µs), but in a later stage <100ns would be desirable.The proposed setup with (reset on capture) + (TRGO on reset) sound...

thomas987 · 2021-06-17

Hi @Community member ,thanks for your quick response!The STGEN is an additional method i haven't thought of, if i understood it correct that would imply that i would have to synchronise:A7 linux system time to STGEN -- do you have any hint for me wh...

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pps-gpio failes to request GPIO

CLOCK_MONOTONIC(_RAW) and STGEN have ~8s difference -- how are they related?

Shared/common time (domain) between A7 and M4

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Re: Shared/common time (domain) between A7 and M4

Re: Shared/common time (domain) between A7 and M4