Analog Input read issue

[christian.martono]

Hi,
I am having trouble reading analog input by using the following command (using piControl):

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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

[->Johannes<-]

Hi Christian,

did you configure your AI_1 in PiCtory?

Pictory.png (5.83 KiB) Viewed 6496 times

What is PiCtory?

Regards

Johannes

[christian.martono]

Hi Johannes,
Yes, I did (as shown in screenshot below)

PICtorysetting.jpg (38.12 KiB) Viewed 6492 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

[->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

[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 6391 times

I also try to see which was outdated - FYI

christiansos2.png (60.38 KiB) Viewed 6391 times

[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?

[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.

[dirk]

Hi could you be so kind to give me an update?