Re: [avrdude-dev] USBasp improvements

[Thomas Fischl]

Jurgis Brigmanis wrote:
> So, "round" anything from 8.0 to 4.0 -> 5.33(3) -> 187.5kHz,
> from 4.0 to 2.0 -> 2.66(6) -> 375kHz,
> 2.0 to 1.0 -> 1.33(3) -> 750kHz, etc. ?

Sounds good to me!

> As USBasp itself is a Low Speed USB device (1.5 Mbit/s), is there a
> point to include 1.5MHz option? Or it will be overkill already?

If it's not difficult to provide this option (perhaps bitclock <1.0?!), we
should also add it.

In USBasp firmware the slow SCK option is currently implemented in
software to get very low frequency (8kHz). Is such a low frequency
actually needed? If 187.5kHz is slow enough for all targets we can drop
this software implementation and use only the hardware ISP.

Thomas