AVR-Chat

At 07:02 PM 11/26/2004, Geert De Pecker wrote:


>Dave,
>
>Am I correct in understanding that your dec-to-zero timers then
>would trigger a pulse, and depending on the acc/decel you set the
>timers to a greater/smaller count to influence the time between
>the interrupt and thus the step pulse?

Those are different, I use them for system events in the 2-200mS range.
When I've done steppers, I do them with timer 1, and reload the time on 
each step according to my accel table.

So to accelerate, index Z to point to the table, get the index, increment, 
store it back.
Now mult the inc'd index by 2, and add to Z. Pull two bytes from where Z is 
pointing, and use that to reload T1.