Unable to change A1 and A2 LED

endress_cg · Post by **endress_cg** » 09 Oct 2018, 21:07

Hello, a college setup some strange stuff on once of our RevPi boxes and now I am unable to change the LED states using piTest command, I am assuming some service or interface has not been started, but cannot see what:

pi@RevPi4038:~ $ piTest -d
Found 1 devices:

Address: 0 module type: 95 (0x5f) RevPi Core V1.2
input offset: 0 length: 6
output offset: 6 length 5

pi@RevPi4038:~ $ piTest -w RevPiLED,4
pi@RevPi4038:~ $ piTest -w 6,1,4
Write value 4 hex (-4 dez) to offset 6.
pi@RevPi4038:~ $

a) Strange that the write with RevPiLED did not reply with anything (1st hint as to problem ?)
b) Second write does the same as on a working box but LED did not change

Post by **Mathias** » 10 Oct 2018, 09:23

Hi,
piTest was developed as a demo program, it is not perfect in all parts. For example -w does not display an error message if a variable does not exist. Therefore your first call of piTest does not work.
The second call
$ piTest -w 6,1,4
Write value 4 hex (=4 dec) to offset 6.
should work.
Could it be that another program writes to the LED variable?
Can you send me the output of 'piTest -1 -r 0,11'?

Mathias

endress_cg · Post by **endress_cg** » 10 Oct 2018, 16:24

Hi, I certainly cannot rule out another program writing to the LEDs but I do not know what it is if there.

As for the 'piTest -1 -r 0,11' test, the output was 11x '0'

Post by **Mathias** » 11 Oct 2018, 12:44

Then the piControl driver is not running correctly.
Please delete the file /var/log/kern.log
reboot the RevPi
and send the new /var/log/kern.log file to me.

endress_cg · Post by **endress_cg** » 12 Oct 2018, 17:16

Here is the log file

hobbit · Post by **hobbit** » 17 Oct 2018, 11:42

Hi all
So far I was using RevPi Core 1 with Wheezy Image. But for some networking problems i recently updated to Jessie Image. My Python application also changes the A1 and A2 LED by 'piTest -w RevPiLED,<value>'. Since I updated to Jessie this doesn't work anymore. No changes on LEDs happen. A1 and A2 are allways off.
'piTest -1 -r 0,11' outputs 11x '0' as well.
'piTest -v RevPiLED' shows:
variable name: RevPiLED
offset: 0
length: 0
bit: 0

Any ideas what's the problem?

Post by **Mathias** » 17 Oct 2018, 17:06

Hi,
that's a really stupid bug, I am really sorry about that.
You flashed the original image. In that image the configuration file /var/www/pictory/projects/_config.rsc is empty. That leads to this behaviour.
We use the same image when we produce the RevPis, but we run a test program afterwards. This program copies a nonempty file to the filesystem and everything is fine.
Unfortunately piTest shows the same output in both cases.

So please, open PiCtory, insert a RevPi V2.1, save the configuration and restart the driver. Then the LEDs should be working.

Mathias

hobbit · Post by **hobbit** » 18 Oct 2018, 10:23

Perfect! This solved the problem for me.

endress_cg · Post by **endress_cg** » 24 Oct 2018, 14:55

Hi, i sent you a log file a week ago and as yet no information on how to fix the led issue, I did attempt to do the instructions you gave to the other forum member, but am unable to due to the other changes on our box.
RaspAP installed (web access bring this up instead), no access to PiCore (link on local GUI does not work), unable to find and get to PiCtory

Post by **Mathias** » 25 Oct 2018, 11:44

Hi,
according to your logfile your _config.rsc file is empty and the solution I described should help you.
I never used RaspAP. I am sorry, but I cannot help you with that.
Mathias

Unable to change A1 and A2 LED

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