|Subject:||[avrdude-dev] USBasp improvements|
|Date:||Tue, 04 Dec 2007 20:01:23 +0200|
|User-agent:||Thunderbird 188.8.131.52 (Windows/20071031)|
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.
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