On Thu, 21 Jun 2007, Jon Elson wrote:
> Date: Thu, 21 Jun 2007 11:30:54 -0500
> From: Jon Elson <[EMAIL PROTECTED]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] m5i20 Homing with index
>
> Richard Arthur wrote:
>> Why doesn't homing complete at the index pulse shown here:
>>
>> http://imagebin.org/9073
>>
>> (Homing with HOME_USE_INDEX = FALSE works okay)
>>
> Your index pulse has the wrong polarity. Note it is sending
> true almost all the time, then goes false for a moment. You
> want it to be false except for a short duration. If it is a
> differential signal, then switcxh the two wires to reverse the
> sense. If it is single-ended, you should be able to invert the
> polarity at hal level, although that may defeat the logic in the
> mesa board.
Not sure how it hooks into HAL, or how the driver handles homing, but in
hardware, the index polarity is set by a bit in the CCR
(CounterControlRegister) This would have to be set correctly to match your
index signals _Active_ polarity.
Also the index mask input would have to be in the proper state if index
maskiing is enabled
Peter Wallace
Mesa Electronics
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