Re: [Gumstix-users] Robostix ISP with Atmel

[Agustin H. <ah...@gm...>]

Do you explain with more detail the messages that appear in the status
window when you are trying to program the robostix?



2007/6/22, Dave Hylands <dhy...@gm...>:
>
> Hi Alex,
>
> >         I've set my fuses to those specified on the robostix wiki, which
> > is the link you sent me.  I also have had the ISP10PIN connected as in
> > your picture.  The strange thing is I can program fuses, erase the
> > device, and even program the mega128 (sort of).  When it goes through
> > its programming routine, it is able to do everything but read back the
> > program it just wrote it ("READING....FAILED!" and fails to leave
> > programming mode).  When I then diconnect the robostix from the STK500,
> > my program magically runs.  I got a nice PWM generator going.
>
> Hmmm. I've experienced problems similar to what you describe. I think
> it may have been when I installed the absolute latest version of AVR
> Studio.
>
> I messed around with ISP frequencies (you need to press the Write
> button as well) and I installed a few different versions of firmware
> on my STK500 as well. Unfortunatley, I don't remember the exact steps
> to get everything sane again.
>
> So in this case I don't think that there is anything wrong with your
> robostix, but rather something with the STK500/AVR Studio.
>
> >         I'm now trying to connect the USART, which is not working out so
> > well.  I have a simple character echo program written (which I verified
> > works when normally programming a mega128).  The echo'd character that
> > pops up in hyperterminal is not the same one I sent out COM1, so it
> > appears I have a really bad baud rate error (clock inaccuracy?).  I have
> > made changes for the different clock frequency.
>
> What baud rate are you trying to use?
>
> Flash-LED.hex prints values out to the UART-0 at 38.4k baud. You may
> want to try that.
>
> >         I thought the robostix has its own 16MHz clock?  Shouldn't I
> > just be able to set the last fuse on the bottom of the page and be good
> > to go, without manually connecting XT1 to the STK500?
>
> Using the XT1 is only required if the ATMega128 gets it fuses set for
> external clock instead of external crystal.
>
> And yes, you want to choose the very last fuse at the bottom of the page.
>
> --
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
>
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