AVR-Chat

Graham,

> What do you mean when you say "updated"? The Olimex document I was 
> referring to is about how to get the software loaded into the 
> JTAG- ICE in the first place from AVR Studio (using AVR 
> prog).  You have to 
> make an adapter cable from the JTAG socket to an ISP device such as 
> the STK500.  This includes opening the case to get at the reset 
> signal. Then, you have to use the ISP to flip the boot fuse. Then you 
> disconnect the ISP, connect AVR Studio to the JTAG-ICE serial port, 
> power up and use AVR prog. After loading the software, verification 
> fails (the documentation says that this is OK, but I'd rather see 
> verification happen). Then you have to go back to the ISP connection 
> and clear out the boot fuse. Then you break down your adapter cabling 
> and put the unit back together.

Upgrading the firmware does nothing other than change its verision
number...

Also, Tsvetan's latest AVR JTAG devices are transparently upgradable
from AVR Studio, it's only for the first few shipped AVR JTAG devices
that you need to do this.

> My JTAG-ICE clone has a pad that you short to ground to start the 
> boot loader. You short this (with a paper-clip, for example) and 
> power up. Then you use AVR prog. Verification works. Then you power 
> down and up again and you're ready to roll.
> 
> What I've got so far is that one person here thinks my JTAG-ICE is a 
> decent product but everyone else is happy with the Atmel, Olimex or 
> roll-your-own options. This is good input and I will initially make 
> only a small number, not expecting to sell that many after all.

You might come a cropper with Atmel, unfortunately.  I think they're
wanting to protect their IP.  It's like the old days with the Mac
emulator for the ST: you had to have true Mac roms to run it, they
didn't ship ROMs with the emulator.

Do you have Atmel's permission to program the firmware into your device,
for instance? or are you going to write your own?

--
Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk
CrossWorks for MSP430, ARM, and (soon) Atmel AVR processors