Jurgis Brigmanis wrote:
Hello!
I'm about to improve USBasp - add software control for ISP SCK speed
(so I could place USBasp in a sealed case and stop worry about "Slow
SCK" jumper). In fact, i've already (sort of) implemented that, just
not ready to submit patches yet.
I was planning to use Avrdude's -B, bitclock command line switch for
that (IMHO it fits), but here's a problem: AVR doesn't have very much
control on hardware ISP speeds - just by factor of 2 - 750kHz, 375kHz,
187.5kHz ...
Unfortunately -B means bit clock period not frequency, and 375kHz for
example, results in 2.66666(6)us period.
Suggestions?
Well the STK500 is not exact either. It also rounds somewhere somehow.
So for stk500 users it would not be a big surprise.
HTH,
Wouter
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