68300

Charlie,
Are you out there still ?

On Monday, November 3, 2003, at 11:48  AM, Tim wrote:

> Hello all,
> I have question I hope some can help with.
> I am using the Stepper Motor fcn of the TPU on a 68376A (not the G
> mask).
> My present code, when it gets a command to move the stepper checks to
> see if the "desired" and "actual" positions are the same, if so then
> set both to the midpoint (0x7FFF). This way it needs some very unusual
> commands to cause overflow. Well you guessed it ...
> A device we added can send a lot of stepper move commands such that the
> "actual" and "desired" don't get reset back to midpoint.
> So I can have a situation like:
> - the current position is says FF00 and moving in a positive direction
> and ending at FFF0 say.
> - then I get a command to move another say F0 positive.
> - well FFF0 + F0 = 100E0, but the SM fcn uses 16bit registers so this
> is 00E0 and hence a large negative move and in-correct behaviour.
> What are possible solutions?
> - can I take the current position (@ FF00) and the desired position
> (@FFF0)(before new request) and set current position to be 8000 and
> desired position to be 80F0 and not screw up the movement in process?
> - other options?
>
> Tim Flynn
> Director of R&D
> RMS Welding Systems
> Ph.(780)955-3907
> http://www.rmsweldingsystems.com
>
>
> Tim Flynn
> Director of R&D
> RMS Welding Systems
> Ph.(780)955-3907
> http://www.rmsweldingsystems.com
>
>
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Tim Flynn
Director of R&D
RMS Welding Systems
Ph.(780)955-3907
http://www.rmsweldingsystems.com