Re: [avr-chat] AVRdude timeouts with CKDIV8 and 4MHz internal on t2313

[Peter Fuhrmann]

Preston Wilson schrieb:
> "Johannes Bauer" wrote:
>
>   
> > Hello list,
> >
> > I just wanted to ask if anyone else has trouble with avrdude the way I
> > do: I have some tiny2313s which are preprogrammed with the CKDIV8 fuse
> > and additionally have the 4MHz internal oscillator active. When I try to
> > do anything with them using avrdude, the very first handshake (device
> > signature) fails. Sometimes the first two bytes arrive OK, but the third
> > is garbled, sometimes all bytes are trash. I do not remember the exact
> > values I got, however.
> >
> > When I enter Ponyprog I can program the devices fine. When I tell it to
> > set the fuses to use an external crystal (slow rising power, no CKDIV)
> > the device can be accessed just fine from avrdude also.
> >
> > Programmer: STK200
> > Cable length: around 20cm
> > OS: Linux joelaptop 2.6.26.1 #9 PREEMPT Sat Dec 27 01:33:46 CET 2008
> > i686 Intel(R) Pentium(R) M processor 1400MHz GenuineIntel GNU/Linux
> > AVRDude: Version 5.5 (Gentoo package dev-embedded/avrdude-5.5)
> >
> > If it is helpful to provide the exact output or more debugging info, I
> > can flash back the fuses to the 4MHz osc. in order to reproduce the problem.
> >     
>
> Use avrdude's -B option to slow down the ISP speed.  Try "-B 32" which will
> work with clocks all the way down in the range of 128KHz.
>
> -Preston
I also thin the Problem is due to a to fast sck. But the -B option in
avrdude does not work for the STK200.
Avrdude uses a fixed delay for bitbang-programmers.
Try uisp instead. It hasn't got as many features as avrdude, but it has
got an option to slow the clock for bitbanging-modes:
-dt_sck=<delay> as i recall. try putting a 1000 in there or something.

Best regards,
Peter