On Fri, 21 Aug 2009, Gene Heskett wrote:
> Date: Fri, 21 Aug 2009 21:06:16 -0400
> From: Gene Heskett <[email protected]>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] Realistic spindle encoder count for parallel port?
>
> On Friday 21 August 2009, Peter C. Wallace wrote:
>> OK got it done and it fits in XC9572 we have on little CPLD board but I
>> wont be able to test it until Monday
>>
>> 1. Input digital filter
>> ok 15 count filter on a,b,index
>>
>> 2. Quadrature decoder (quadrature to up/down)
>> ok
>>
>> 3. Up down modulo N counter (for divide by N)
>> ok has 8 selectable DIVIDE_RATIOS via three input signals (jumpers on CPLD
>> bd)
>>
>> 4. 2 bit up/down counter
>> ok
>>
>> 5. 2 bit binary --> quadrature encoder
>> ok
>>
>> 6. Optional index stretcher
>>
>> Works a little strange but should be ok, basically index out is set by
>> incoming (filtered) index and cleared when DIVIDE_RATIO input encoder
>> counts have occured (either up or down or a mix) As long as only one edge
>> is used you will always get a index signal with a minimum width of one
>> (divided) count
>
> That sounds almost exactly like what I would need to control the spindles on
> both my little lathe, and on the micro-mill. Do you have a target price for
> the completed unit?
I have bare CPLD circuit cards that I can send out for shipping cost, the CPLD
is about ~2.00 its in a 44 lead PLCC. I could make preprogrammed version if
anyone wants just chips or just post the source if anyone wants to hack it.
The source is basically just bits and pieces copy-pasted from the HostMot2
encoder counter with a few added wigglers and twirlers.
for a standalone chip version I'd add a ring or R/C oscillator so it does not
need a separate clock
I think I only have one assembled CPLD card An I promised that to Steve B
Peter Wallace
Mesa Electronics
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