Raspberry Pi read only

2022-01-27T20:49:37.139000Z

Hi yannickasselin,

I'm also using the RPI CM4 in a touch screen which has eMMC and a spare SD card slot. I was going to partition the eMMC as I'm concerned the vibrations will cause issues with SD card.

So you did not get it working with the partition and without a delay? I will continue and keep you updated when I find a solution

Raspberry Pi read only

2022-01-27T14:33:22.460000Z

Yes it was working but I did not spend much time testing it.

I now use some Raspberry Pi CM4 with the overlay enabled and I save my persistent variables on a usb stick instead of a second partition.

I followed a quick guide to make sure my usb stick is always mounted on the same directory and so far did not need to delay the codesys runtime.

Everything works fine but I am still experimenting with it.

Dont't hesistate to post your findings on this topic.

Raspberry Pi read only

2022-01-26T22:48:11.901000Z

Hi yannickasselin,

Did you get this working on another partition and is it a reliable option?

Thanks

Raspberry Pi read only

2021-02-02T11:30:52.129000Z

Hi Edwin,
You wrote "there are some problems with the softlicense".
Can you give some more information about it?
Does it mean right now (with all latest Versions of Raspberry OS, CODESYS, and Raspi packages) it is not worth trying because it will fail anyway when using a soft license?

Raspberry Pi read only

2021-01-11T21:29:58.225000Z

With a second partition I still need to add a delay. I will try to find out how to make sure the partition or the usb stick is mounted before starting the runtime.

Raspberry Pi read only

2021-01-11T20:33:20.844000Z

It seems to work when adding " /bin/sleep 10 " in /etc/init.d/codesyscontrol but I agree, it is probably not the best way to do it. I will try using a separate partition on the sd card instead of USB stick.

Raspberry Pi read only

2021-01-11T19:44:38.453000Z

I would try a sleep in the
/etc/init.d/codesyscontrol
but I'm not sure if this is a proper solution

Raspberry Pi read only

2021-01-11T19:03:56.198000Z

I found that the placeholder is $PlcLogic$ not $PLCLogic$ There is an error in Codesys Help:
https://help.codesys.com/webapp/ac_pm_overview;product=core_Application_Composer;version=3.5.16.0

So this is working now:

[SysFile]
FilePath.1=/etc/, 3S.dat
PlcLogicPrefix=1
PlaceholderFilePath.1=/media/pi/DATA/PlcLogic, $PlcLogic$
PlaceholderFilePath.1.Volatile=1
PlaceholderFilePath.1.View=1

But I still have a problem. I think Codesys starts before the USB stick gets mounted. So Codesys creates another folder named DATA in media/pi. I think I have seen a way to delay the start of the runtime but I cannot find it now.

Is there a setting to delay the start of the runtime?

Raspberry Pi read only

2021-01-11T17:36:31.252000Z

When I do this, everything works fine. I can see the persistent variables written on USB stick:

[SysFile]
FilePath.1=/etc/, 3S.dat
PlcLogicPrefix=1
PlaceholderFilePath.1=/media/pi/DATA/ac_persistence, $ac_persistence$
PlaceholderFilePath.1.Volatile=1
PlaceholderFilePath.1.View=1

But when I do this, nothing is written on the USB stick:

[SysFile]
PlcLogicPrefix=1
FilePath.1=/etc/, 3S.dat
PlaceholderFilePath=/media/pi/DATA/PlcLogic, $PLCLogic$

Raspberry Pi read only

2021-01-11T17:12:11.954000Z

I must be missing something. It does not seem to work. Nothing gets written on the USB stick.

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