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+--- Forum: General Discussion on ROCKPRO64 (https://forum.pine64.org/forumdisplay.php?fid=99)
+--- Thread: No /dev/gpiochip[n] on RockPro64. (/showthread.php?tid=9459)
No /dev/gpiochip[n] on RockPro64. - Faradn - 03-18-2020
SBC: Rockpro64 v2.1 4Gb
OS: ubuntu 18.04 minimal w / Mate' DE
Linux rockpro64 4.4.190-1233-rockchip-ayufan-gd3f1be0ed310 #1 SMP
Wed Aug 28 08:59:34 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
I'm working with the libgpiod library and noticed there is no GPIO
character device on the RockPro64. The GPIO character device exists
on the Odroid XU4, N2 & the Pi 3B. Is this unique to the Rockchip
family of ARM processors?
TIA,
/Faradn
~ Rockpro64 ~ Odroid N2 ~ Odroid XU4 ~ Pi 3B ~
RE: No /dev/gpiochip[n] on RockPro64. - tllim - 03-21-2020
(03-18-2020, 12:27 PM)Faradn Wrote: SBC: Rockpro64 v2.1 4Gb
OS: ubuntu 18.04 minimal w / Mate' DE
Linux rockpro64 4.4.190-1233-rockchip-ayufan-gd3f1be0ed310 #1 SMP
Wed Aug 28 08:59:34 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
I'm working with the libgpiod library and noticed there is no GPIO
character device on the RockPro64. The GPIO character device exists
on the Odroid XU4, N2 & the Pi 3B. Is this unique to the Rockchip
family of ARM processors?
TIA,
/Faradn
~ Rockpro64 ~ Odroid N2 ~ Odroid XU4 ~ Pi 3B ~
https://forum.frank-mankel.org/topic/292/rockpro64-rp64-gpio/2
RE: No /dev/gpiochip[n] on RockPro64. - Faradn - 03-25-2020
(03-21-2020, 04:41 PM)tllim Wrote:(03-18-2020, 12:27 PM)Faradn Wrote: SBC: Rockpro64 v2.1 4Gb
OS: ubuntu 18.04 minimal w / Mate' DE
Linux rockpro64 4.4.190-1233-rockchip-ayufan-gd3f1be0ed310 #1 SMP
Wed Aug 28 08:59:34 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
I'm working with the libgpiod library and noticed there is no GPIO
character device on the RockPro64. The GPIO character device exists
on the Odroid XU4, N2 & the Pi 3B. Is this unique to the Rockchip
family of ARM processors?
TIA,
/Faradn
~ Rockpro64 ~ Odroid N2 ~ Odroid XU4 ~ Pi 3B ~
https://forum.frank-mankel.org/topic/292/rockpro64-rp64-gpio/2
SBC: Rockpro64 v2.1 4Gb
OS: ubuntu 18.04 minimal w / Mate' DE
Linux rockpro64 4.4.190-1233-rockchip-ayufan-gd3f1be0ed310 #1 SMP
Wed Aug 28 08:59:34 UTC 2019 aarch64 aarch64 aarch64 GNU/Linux
Thank you TlLim.
My interest is with the libgoiod [C] library.
Hope all is well with you and yours.
TIA,
~ Rockpro64 ~ Odroid N2 ~ Odroid XU4 ~ Pi 3B ~
https://www.youtube.com/watch?v=ljOoGyCso8s
RE: No /dev/gpiochip[n] on RockPro64. - Gienek - 04-20-2020
Hello,
According to this article:
https://www.beyondlogic.org/an-introduction-to-chardev-gpio-and-libgpiod-on-the-raspberry-pi/
the new chardev GPIO interface has been introduced as of Linux 4.8.
I am using a recent Linux release from Mrfixit2001, and it has kernel 4.4.207.
Maybe it is necessary to wait for newer releases, to get the new GPIO interface?
Best regards,
Gienek.
RE: No /dev/gpiochip[n] on RockPro64. - Faradn - 04-20-2020
(04-20-2020, 04:31 AM)Gienek Wrote: Hello,
According to this article:
https://www.beyondlogic.org/an-introduction-to-chardev-gpio-and-libgpiod-on-the-raspberry-pi/
the new chardev GPIO interface has been introduced as of Linux 4.8.
I am using a recent Linux release from Mrfixit2001, and it has kernel 4.4.207.
Maybe it is necessary to wait for newer releases, to get the new GPIO interface?
Best regards,
Gienek.
Thanks @Gienek.
I'm now running Manjaro Arm v20.04 with kernel 5.6.0 and all (4)
gpiochip character devices exist.
/Faradn
RE: No /dev/gpiochip[n] on RockPro64. - Gienek - 04-21-2020
O! I did not know about such difference between Linux releases for ROCKPro64.
Have you already gathered experience about performance of this new interface? It is very interresting!
I am using a set of own C-functions to handle GPIO. This is very fast and simple, but I miss one functionality: A possibility of async reaction to interrupt from GPIO. I have no clue, how to achieve this in purely user-space process.
Does this new interface allow for something, like select() which returns when GPIO pin changes state?
BR,
Gienek.
RE: No /dev/gpiochip[n] on RockPro64. - Faradn - 04-21-2020
(04-21-2020, 06:41 AM)Gienek Wrote: O! I did not know about such difference between Linux releases for ROCKPro64.I'm using libgpiod-1.4.1.
Have you already gathered experience about performance of this new interface? It is very interresting!
I am using a set of own C-functions to handle GPIO. This is very fast and simple, but I miss one functionality: A possibility of async reaction to interrupt from GPIO. I have no clue, how to achieve this in purely user-space process.
Does this new interface allow for something, like select() which returns when GPIO pin changes state?
BR,
Gienek.
Works very well on my Odroid N2.
Will begin testing on my RockPro64 shortly.
/Faradn