Re: Easy example for analog out needed, please

From: Heinrich du Toit <heinrichdt_at_tlabs.ac.za> · Date: Thu, 20 Sep 2007 15:22:48 +0200

I'm sure somebody else will get back to you with a "better/complete"
example.

But I like to point out a few things to you:

firstly. Are both comedi and comedilib installed correctly?
Did you do a comedi_setup so that /dev/comedi0 is linked to the device -
did this success?

Then it is fairly simple.

You need a comedi_open
and then you can do comedi_data_write

use comedi_find_subdevice_by_type to find the subdevice number.

in the comedilib/demo dir there is a program outp.c
This is more or less the simplest example out there.
Offcourse this one works with parameters - hardcoding will make code
shorter maybe :)
I'm sure you'll manage.

On Thu, 2007-09-20 at 12:59 +0000, Johannes wrote:
> Hi Comedi Users,
> 
> I read the comedi doc a couple of times and tried the examples of
> comedilib, but I still dont understand how to make the analog out working,
> so I dont know how to write a program that simply set the analog out.
> I know I have to use comedi_data_write, but how exactly do I set the value
> for the output.
> I also have no clue how the data type lsampl_t works.
> 
> Does anybody have a short and easy example?
> 
> Regards
> 
> PS: I got digital in/out working just fine
> 
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