PCIDAS 4020/12 ext trigger/clock

I've posted this question at comedi.org and not received a response.  My 
boss keeps bugging me to get this external clock code working but I 
don't know how to do it.
I found a reference to this INSN_CONFIG_TIMER_1 since I sent this email 
which helps some but still leaves a lot of questions.  Now, I guess the 
data structures should look like:

data[0]=INSN_CONFIG_TIMER_1;
data[1]=COMEDI_EV_SCAN_BEGIN;  correct?
data[2]= ???  trigger negative edge (digital, not analog trigger)
data[3]=0x04;
data[4]=???  divisor for 10Mhz clock

insn[1].insn=INSN_CONFIG;
insn[1].n=n_scan;
insn[1].data=data;
insn[1].subdev=subdevice;
insn[1].chanspec=INSN_CONFIG_TIMER_1;

As you can see I'm still guessing on some of this.  If there's any documentation that would help me please point me to it.

thanks - Nick Iorio



-------- Original Message --------
Subject: 	Re: PCIDAS 4020/12 ext trigger/clock
Date: 	Mon, 13 Dec 2004 09:08:47 -0800
From: 	Nick Iorio <niorio_at_jmar.com>
To: 	Frank Mori Hess <fmhess_at_users.sourceforge.net>, comedi_at_comedi.org
References: 	<419E2C60.50700_at_jmar.com> 
<200411201143.04840.fmhess_at_users.sourceforge.net>



Hi Frank,
I've been reading the documentation on this and I understand the
TRIG_OTHER but am having a hard time figuring out how I code for the
external clock.  I don't know what you meant by "using an INSN_CONFIG_TIMER_1 configuration insn
to configure the divisor to use for the external clock."  Could you give me the rest of the insn code I need to
define an external clock of 10Mhz?

I'm adding a 4th instruction (before the INSN_READ) to the example
insn.c code wihch so far looks like this:
insn[1].insn=INSN_CONFIG;
insn[1].n=n_scan;
insn[1].data=data;
insn[1].subdev=subdevice;
insn[1].chanspec=INSN_CONFIG_TIMER_1 ???

thanks - nick

Frank Mori Hess wrote:

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>On Friday 19 November 2004 12:24 pm, Nick Iorio wrote:
>  
>
>>I have a PCIDAS 4020/12 which has an external trigger connected to the
>>BNC and an external clock connected to pin 10 of the 40 pin connector.
>>How do I reference these in comedi?
>>thank you - nick
>>    
>>
>
>It looks like the comedilib docs haven't been synced with the drivers 
>recently.  This quote may help:
>
>To select the bnc trigger input on the 4020 (instead of the dio input),
>specify a nonzero channel in the chanspec.  If you wish to use an external
>master clock on the 4020, you may do so by setting the scan_begin_src
>to TRIG_OTHER, and using an INSN_CONFIG_TIMER_1 configuration insn
>to configure the divisor to use for the external clock.
>
>- -- 
>Frank
>
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