> -----Original Message----- > From: Per Jessen <p...@jessen.ch> > Sent: 25 November 2019 10:46 > To: opensuse-arm@opensuse.org > Subject: RE: [opensuse-arm] any hints for getting ds1820s to work with my nano > pi neo air? > > Guillaume Gardet wrote: > > > Hi, > > > >> -----Original Message----- > >> From: Per Jessen <p...@jessen.ch> > >> Sent: 24 November 2019 16:07 > >> To: opensuse-arm@opensuse.org > >> Subject: [opensuse-arm] any hints for getting ds1820s to work with my > >> nano pi neo air? > >> > >> I measure temperature with DS1820 hooked up to microcontrollers (PIC) > >> or via serial interface to regular PCs, now I was hoping to use a > >> nanopi neo air, but I am not getting anywhere. > >> > >> I have the modules loaded - w1-therm, wire, w1-gpio - but no devices > >> turn up in /sys/bus/w1/devices. I'm connecting the DS1820s to > >> GPIO11 - I guess I need to modify the DTB to make this work? > > > > There are some information about 1-wire here: > > https://en.opensuse.org/openSUSE:1-wire > > Thanks Guillaume, > > Yes, I've seen that one, but it's very limited :-)
Yes, it is, but 1-wire as well. 😉 Feel free to improve it with your findings, if appropriate. > > > If you want to use 1-wire on a regular gpio, with w1-gpio module, you > > need to update your device-tree to setup it properly. Then, you can > > check /sys/bus/w1/devices folder for any devices found on the 1-wire > > bus. > > > > If you do not update your DTB, w1-gpio will not know which gpio to > > use. > > I picked gpio11 because it happened to be convenient for the wiring, but I > don't > really care which one I use. What is the easiest way of using 1-wire devices > on > the nanopi, without having to modify the DTB ? I'm using the Friendlycore > DTB, > not the one from the openSUSE Jeos image. I fear that you need to update your DT. Not sure what is the current status of Device Tree Overlays, upstream. If device tree overlays are supported, you may just need to create a dt fragment, compile it and load it at runtime or on boot as a kernel option. Matthias, Yousaf, do you know about the status of the DT overlays? Guillaume > > > > -- > Per Jessen, Zürich (7.1°C) > Member, openSUSE Heroes. > > -- > To unsubscribe, e-mail: opensuse-arm+unsubscr...@opensuse.org > To contact the owner, e-mail: opensuse-arm+ow...@opensuse.org IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
