DI Counter on Web, but not in /sys

knebb

Hi again,

I am using DI 2.01 on an Neuron M103.

I connected (thanks to support here!) a device which sends impulses.

When I browse to the Evok Web-Page, go to "configuration" and select 2.01 I can see the counter going upwards. So it counts perfectly. Being at 78, a second later it states 79. Nice!

Now I want to get this value by some scripting software and tried to access the counter value through the sysfs. I am in /sys/devices/platform/unipi_plc/io_group2/di_2_01 and see the following files:

insgesamt 0
-rw-rw---- 1 root root 4096 Mai 10 12:32 counter
-rw-rw---- 1 root root 4096 Mai 10 12:32 debounce
-rw-rw---- 1 root root 4096 Mai 10 12:32 direct_switch_enable
-rw-rw---- 1 root root 4096 Mai 10 12:32 direct_switch_polarity
-rw-rw---- 1 root root 4096 Mai 10 12:32 direct_switch_toggle
-r--r----- 1 root root 4096 Mai 10 12:32 di_value
lrwxrwxrwx 1 root root    0 Mai 10 12:32 driver -> ../../../../../bus/spi/drivers/NEURONSPI
-rw-r--r-- 1 root root 4096 Mai 10 12:32 driver_override
drwxr-xr-x 3 root root    0 Mai 10 12:32 gpio
drwxrwx--- 3 root gpio    0 Mai  7 08:18 gpiochip3
-r--r--r-- 1 root root 4096 Mai 10 12:32 modalias
drwxr-xr-x 2 root root    0 Mai 10 12:32 power
lrwxrwxrwx 1 root root    0 Mai 10 12:32 subsystem -> ../../../../../bus/platform
-r--r----- 1 root root 4096 Mai 10 12:32 sys_gpio_di_base
-r--r----- 1 root root 4096 Mai 10 12:32 sys_gpio_di_count
-r--r----- 1 root root 4096 Mai 10 12:32 sys_gpio_di_prefix
-rw-r--r-- 1 root root 4096 Mai 10 12:32 uevent

So it looks pretty nice. there is a file called "counter"- unfortunately it is still on 0. And no other file here has a content which equals to the counter the EVOK Web frontend displays.
So where do I get the counter from the sysfs? Oh, and additionally- what is the maximum value of the counter?

Thanks again!

knebb

Me again.

MEanwhile I figured out (thanks to sysfs-docs from here I can even write to the file named "counter" with echo "9" > counter.

Well, when I do so the value on the web front end changes to something like 655359 and continues counting. While the file I wrote to stays on the "9".

Anyone having a clue how these two matches?

TomasKnot

This looks like a mistake in the sysfs, I'll try to get it fixed shortly. For background - the counters are stored as 2 16-bit values, which is where the behaviour you see probably comes from - you are reading and writing only to the top part of the counter value.

If you could post the output from "uname -a" I could send you a test library binary, it's only a couple dozen kilobytes in size.

Otherwise it may take a while before it is updated everywhere.

knebb

Here you are:

uname -a
Linux zentrale 4.9.41-v7+ #1023 SMP Tue Aug 8 16:00:15 BST 2017 armv7l GNU/Linux

TomasKnot

It should now be fixed in the kernel module git repository, I will send you the binary via a private message.

knebb

@TomasKnot
Thanks. If you let me know what file it is I can get it through git (I am not a coder but I know at least how to download through git) and copy it to the proper destination folder on my device.

TomasKnot

I'd rather send it directly, it's only in source code on git and compiling it is not trivial.

You should have the link in your messages now.