[Owfs-developers] Problems with DS2450 ...

[Ritchie]

Dear all,

I know this is not a common owfs problem, but I would like to know some
information about the communication to the ds2450 and how to debug it
with the owserver.

Wright now I am working on a Ds2450 Slave, based on a attiny45 and
I get the values "Error: Invalid argument" on "PIO.*" and "volt.*" shown
as values in the webpage of the owserver.

The "memory" is shown the value
"0000000000000000008000800080008000FF00FF00FF00FF0000000040000000"

and I do not know how to find the reason, because Memory transfer is
working so far i can see correctly (used values of 1.. 31 and checked it
on the "page" infos).


I also noticed, that the command "CONVERT" (0x3C) was not send to the
slave (or was not recognize), which I guess is my fault, but where do I
have to take a closer look. I do not have a logic analyser to get closer.

I also try to show the communication of the owserver, but I do
not see any entries on the console.

I used the command:

sudo /usr/bin/owserver --foreground --error_print=0 --error_level=9 -c
/etc/owfs.conf


Can anybody help me ?

Best regards

R.

[Jan Kandziora]

Post by Ritchie
Dear all,
I know this is not a common owfs problem, but I would like to know some
information about the communication to the ds2450 and how to debug it
with the owserver.

Please look at the source code. module/owlib/src/c/ow_2450.c has most of
the relevant code for communicating with the chip. The other part is in
module/owlib/src/c/ow_memory.c

Post by Ritchie
Wright now I am working on a Ds2450 Slave, based on a attiny45 and
I get the values "Error: Invalid argument" on "PIO.*"

You have to follow the FS_r_PIO() function down to the place in the code
which is interesting to you.

I strongly recommend to build you own version of OWFS and add some
instrumentation in that file so you see what is delivered from your
homebrewn device.

Post by Ritchie
and "volt.*" shown
as values in the webpage of the owserver.
The "memory" is shown the value
"0000000000000000008000800080008000FF00FF00FF00FF0000000040000000"
and I do not know how to find the reason, because Memory transfer is
working so far i can see correctly (used values of 1.. 31 and checked it
on the "page" infos).

So, reading individual PIOs work but the aggregate doesn't?

Post by Ritchie
I also noticed, that the command "CONVERT" (0x3C) was not send to the
slave (or was not recognize), which I guess is my fault, but where do I
have to take a closer look. I do not have a logic analyser to get closer.
I also try to show the communication of the owserver, but I do
not see any entries on the console.
sudo /usr/bin/owserver --foreground --error_print=0 --error_level=9 -c
/etc/owfs.conf

Try the --debug switch instead. And please check that you don't
accidentally use a version of OWFS with messages disabled during
compilation. That has been the case for older debian packages, for example.

Kind regards

Jan