Re: [avrdude-dev] Performance of programming via MPSEE

[Hannes Weisbach]

Am 13.08.2012 um 20:08 schrieb Ing. Daniel Rozsnyó:

> Hi,
>  I finally get my onboard programming via FT2232HL to work (on previous 5.11 
> release, there was a random verification failure, todays svn is ok).
Yes, I fixed them ;)
> 
> 
>  Are there any switches to tune the performance of the MPSEE mode? My mcu 
> runs at 16M, so clock throttling should not be required.
> 
Yes. You can adjust the frequency with -b. The default is 150kHz (I think), so 
it is quite slow. But it needs to be that slow by default, so that all factory 
devices work - even with bad cabling ;). The maximum ISP clock with 16MHz 
crystal should be 4MHz, so the maximum for you should be -b 4000000. Depeding 
on the quality of your programming cable (lead inductance, ground connection, 
etc) your mileage may vary. Try starting with -b 1000000. Would you be so kind 
as to report some performance figures back?
> 
> Note:
>  I specially connected the USB cable to a motherboard port (as my USB hub 
> somehow slows down all transfers - e.g. to a card reader).
It's probably a USB 1.1 Hub (12MBit/s vs 480 of USB 2.0).

Best regards,
Hannes