AVR-Chat

John Samperi wrote:
> At 02:56 PM 20/03/2005, you wrote:
> 
>>Where do you get the firmware to turn a mega8535 into a jtagice?
>
> It is not a 8535 but a M16. The board DXIO-6 uses a 8535
> which is pin compatible with the M16 so it was quite easy to build
> the circuit for the ice as 90% of the stuff is already there i.e.
> Power supply, RS232, oscillator etc. The programming socket carries
> power and 3 of the signals required fo the ice...so a little veroboard
> some connectors a few components and it's all done.
> For firmware just do a search for jtagice and you will come
> up with lots of usefull info ;-) then Studio does the upgrade to
> the lastest firmware.

I know a guy that tried that with a mega16 but avr studio wouldn't
see it as a jtag ice. The jtag ice mk-I has a mega163 in it. So you're
saying the firmware from avr studio works unmodified in a mega16? If so,
i'll have another look at his pcb.

>>Could have something to do with the setting that allows timers
>>to be stopped or run at full speed during jtag single-stepping.
> 
> Maybe...now it's flashing sporadically with the ice back on.
> Lots of new stuff to learn and many questions to ask....

Make sure the ice isn't automatically changing any clock fuses,
or loading down VCC on the target pcb.