On Sunday 30 September 2001 12:47, Greg Shenaut wrote:
> Well, setitimer has a maximum rate of 100 Hz, with a slop factor
> sometimes much greater than 10 ms. This was the result of some
> recent testing on a lightly-loaded standard 4.3 system.
That's not good enough. :/
> How many stepper motors are you driving? If it's only one at a time, then
> maybe the speaker port on the motherboard (a programmable counter-timer)
> would be more reliable.
I like the speaker port idea. Can one program the speaker port to generate
an int/signal/un-block using bsd's kernel API?
> Another idea is to use a fifo'ed UART's data out
> line and fiddle with the baud rate to vary the speed of the pulses.
I don't think this will provide the "smoothness" I want. Going from
2400->4800 steps/sec for example would be a huge jerk. Need SMOOTH
transition (constant-acceleration).
But the speaker port idea sounds great.
--Bart
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