[Color Computer] [coco] Learning MW C

[Gene Heskett]

On Monday 14 August 2006 11:00, jdaggett at gate.net wrote:
>On 14 Aug 2006 at 0:32, James Diffendaffer wrote:
>> --- In ColorComputer at yahoogroups.com, "George's Coco Address"
>>
>> <yahoo at ...> wrote:
>> >Should I wish to step these motors faster, I need to also use
>> > a modified sine wave. I figure four bits per coil could do this. Of
>>
>> course,
>>
>> > this takes more time for the computer to do and speed is getting more
>> > serious.
>>
>> Can you precalculate a table for the sine wave and then just figure
>> the starting point in the table to start sending values from?
>
>*************************
>
>Analog Devices makes low frequency DDS (Direct Digital Synthesis) chips
>that uses 32 bit serial or parallel command to set the frequency.  The
>AD9831 will synthesize any frequency from ab out 1 Hz to 12.5 MHz in 1 Hz
>steps. A well designed post filter and an external 25MHz clock frequency
> and then the computer can just upload the frequency encoded in four
> bytes to the chip.

Which is nice, but where then is the motor?  How many cycles has this chip 
generated since the last time it was updated?  Its a question that in the 
interests of not ruining the parts because the bit went too far, cannot be 
ignored.

>james

-- 
Cheers, Gene
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