gmane.linux.distributions.emc.user

Re: Write error with hostmot2 and 7i43 board

Peter,

>> What EPP mode are you using and what type and length of cable do you have
between the 7I43 and Parallel port? <<

The available parallel port modes in the BIOS are Output only,
Bi-directional, EPP and ECP. It is set to EPP, but I do not see a further
selection for mode of EPP. I think we determined previously that it was
version 1.9. 

The cable was fairly hard to find, I got it here:
http://www.sealevel.com/product_detail.asp?product_id=732&26%2DPin%5FIDC%5Ft
o%5FDB25%5FCable%5F

It is 8" long and I previously rang it out.

>> What type of paralle port do you have (motherboard/PCI add-in) <<

The parallel port is straight from the mother board. This is the motherboard
I am using:
http://www.mini-box.com/Intel-D945GCLF2-Mini-ITX-Motherboard?sc=8&category=1
00

>> Is the iteration count always the same? <<

No. Running it again I got an iteration count of 30865.

>> I dont know if it would be caught by software checking but ISTR the 7I43
cannot use a base thread (EPP operations need to be atomic) so a 7I43 HAL
should only normally only use a Servo thread <<

(Continue reading)

headers

Peter C. Wallace | 5 Dec 05:18

Re: Write error with hostmot2 and 7i43 board

On Thu, 4 Dec 2008, Eric H. Johnson wrote:

> Date: Thu, 4 Dec 2008 22:56:04 -0500
> From: Eric H. Johnson <ejohnson@...>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc-users@...>
> To: "'Enhanced Machine Controller (EMC)'" <emc-users@...>
> Subject: Re: [Emc-users] Write error with hostmot2 and 7i43 board
> 
> Peter,
>
>>> What EPP mode are you using and what type and length of cable do you have
> between the 7I43 and Parallel port? <<
>
> The available parallel port modes in the BIOS are Output only,
> Bi-directional, EPP and ECP. It is set to EPP, but I do not see a further
> selection for mode of EPP. I think we determined previously that it was
> version 1.9.

Newer bitfiles will only work with 1.9 so that seems correct

>
> The cable was fairly hard to find, I got it here:
> http://www.sealevel.com/product_detail.asp?product_id=732&26%2DPin%5FIDC%5Ft
> o%5FDB25%5FCable%5F
>
> It is 8" long and I previously rang it out.
>
>>> What type of paralle port do you have (motherboard/PCI add-in) <<
>

(Continue reading)

headers

Sebastian Kuzminsky | 5 Dec 07:03

Re: Write error with hostmot2 and 7i43 board

Peter C. Wallace wrote:
> On Thu, 4 Dec 2008, Eric H. Johnson wrote:
> 
>> I am using the servo-thread for read and write. I also tried slowing down
>> the servo thread, although I could try slowing it down more. I was using 1ms
>> (1000000).
> 
> 1 ms should be fine (I think 100Usec is the approximate read+write time)

These figures are correct.  hm2_7i43.read() and hm2_7i43.write() 
together take about 100 us, so any servo period above about 200 us 
should work well with the 7i43.  1 ms is a great number to use.

--

-- 
Sebastian Kuzminsky
One of my most productive days was throwing away 1000 lines of code.
     -- Ken Thompson

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