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Analog Input read issue
Posted: 26 Jul 2021, 14:31
by christian.martono
Hi,
I am having trouble reading analog input by using the following command (using piControl):
Code: Select all
pi@raspberrypi:~ $ piTest -r AIn_1
, where the returned reading is always 0
Anybody has run into same issue?
But, once I performed the following manual raw iio read (see below code), then the analog input reading using above will start working correctly.
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pi@raspberrypi:~ $ sudo cat /sys/bus/iio/devices/iio:device1/in_voltage0_raw
Once I performed power cycle (turn off the device), the issue is back again.
Note: I am using RevPi Compact - and i have configure this device using PICtory.
Thanks.
-Christian
Re: Analog Input read issue
Posted: 28 Jul 2021, 08:37
by ->Johannes<-
Hi Christian,
did you configure your AI_1 in PiCtory?
- Pictory.png (5.83 KiB) Viewed 6493 times
What is PiCtory?
Regards
Johannes
Re: Analog Input read issue
Posted: 28 Jul 2021, 09:40
by christian.martono
Hi Johannes,
Yes, I did (as shown in screenshot below)
- PICtorysetting.jpg (38.12 KiB) Viewed 6489 times
Is there anything else that I need to configure?
I should have mentioned also that the issue is intermittent. Analog Input reading (via piTest) sometimes works even after reboot. But 50% of the time it would fail again (returning 0), until I perform the
iio raw read. Note that I have 5 other RevPi Compact devices and they all behave exactly the same way - thus i don't believe this is device issue.
Also, note that while I am troubleshooting this, i look at the piControl logs (in the /var/log/kern.log) -- see my other posting
https://revolution.kunbus.de/forum/vie ... f=6&t=2998 -- and i notice that the piControl is producing "missed cycle " warnings / errors. I am not sure if these are related, but these warning/error messages are unsettling.
-Christian
Re: Analog Input read issue
Posted: 29 Jul 2021, 14:20
by ->Johannes<-
Hi Christian,
did you updated your device with:
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sudo apt-get update
sudo apt-get upgrade
Could you send a SOS-Report?
Guide:
SOS Report
You have to register for free.
Meanwhile I will check this behaviour on a device.
Regards
Johannes
Re: Analog Input read issue
Posted: 01 Aug 2021, 09:23
by christian.martono
Hi Johannes,
I tried to get the sos, but I got the following "Unable to locate package revpi-sos" error. Did I miss any step? Any advice?
- christiansos.png (45.34 KiB) Viewed 6388 times
I also try to see which was outdated - FYI
- christiansos2.png (60.38 KiB) Viewed 6388 times
Re: Analog Input read issue
Posted: 05 Aug 2021, 11:29
by christian.martono
Hi Johannes, or others,
Any comments?
I tried to get revpi-sos but could not get the tool. So I am not sure how else to provide anymore diagnostic info.
Also, the issue persists intermittently on all of my 5 RevPI Compact devices. I have done all the apt-get update and upgrades. The fact that the issue happens on all 5 devices, could it be my setup? The device are connected to power supply and analog inputs (0-8V signal) - nothing else. The devices are powered with 26V power supply (instead of "typical" 24V), but I believe this should be still within the max ratings. The devices are on the field (and CPU temperature reading is up to 70deg Celsius max). Could any of this setup be the issue?
Re: Analog Input read issue
Posted: 16 Aug 2021, 15:01
by dirk
Hello Christian, unfortunately a mistake has crept in with us. You just need to install this package: "sudo apt install revpi-tools ". Then you can create the SOS report with "repvi-sos".
26 volts are within the tolerance range of the RevPi see data sheet.
Re: Analog Input read issue
Posted: 27 Aug 2021, 19:30
by dirk
Hi could you be so kind to give me an update?