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Problems with Olimex AVR-USB-JTAG and Spark Fun Electronics

Started by larwe January 8, 2006
Has anyone successfully used this product?

I posted a query here a week or two ago, no replies - so I ordered one
from Spark Fun Electronics. It arrived with the wrong USB cable (they
shipped A to B, it requires A to A) and SFE never responded to my email
asking for the problem to be corrected (note to self: buy elsewhere
next time). So I cannibalized two other USB cables and got it
connected.

I installed the latest driver from FTDI, and it mounted the device as
COM5. I can't find any method in registry or control panel to change
that, by the way.

AVR Studio won't connect. I select JTAGICE and COM5, and it just pauses
for a little while then returns to the select-port dialog.

It is possible my target isn't working properly yet - but shouldn't AVR
Studio connect to the ICE even if there is no target connected? It's
not establishing any communication whatsoever.

larwe wrote:
<snip>
> I installed the latest driver from FTDI, and it mounted the device as > COM5. I can't find any method in registry or control panel to change > that, by the way.
<snip> XP(sp2) DeviceManager->Ports->Com5->Properties->Advanced->DropDown HTH Rocky
Rocky wrote:

> > I installed the latest driver from FTDI, and it mounted the device as > > COM5. I can't find any method in registry or control panel to change > > XP(sp2) > DeviceManager->Ports->Com5->Properties->Advanced->DropDown
Ah, I'll try moving it to COM2 when I get home. I noticed that Olimex mentioned problems with firmware upgrades on ports > 2. Thanks.
Try posting to the SFE forum, or see if anyone there has the same
problem.

Leon

larwe wrote:

> AVR Studio won't connect. I select JTAGICE and COM5, and it just pauses > for a little while then returns to the select-port dialog.
This turns out to be a case of RTFM, sorta. Olimex's web page http://www.olimex.com/dev/avr-usb-jtag.html says "no need for external power supply as takes power from USB port". This turns out not to be true; the AVR-USB-JTAG requires target power.
On 10 Jan 2006 17:16:02 -0800, "larwe" <zwsdotcom@gmail.com> wrote:

>larwe wrote: > >> AVR Studio won't connect. I select JTAGICE and COM5, and it just pauses >> for a little while then returns to the select-port dialog. > >This turns out to be a case of RTFM, sorta. Olimex's web page >http://www.olimex.com/dev/avr-usb-jtag.html says "no need for external >power supply as takes power from USB port". This turns out not to be >true; the AVR-USB-JTAG requires target power.
.. just like the Atmel JTAGs - it's for the JTAG's level converter chips that make the device work with targets with different Vcc as far as I remember. Mit freundlichen Gr&#4294967295;&#4294967295;en Frank-Christian Kr&#4294967295;gel
Frank-Christian Kruegel wrote:

> >> AVR Studio won't connect. I select JTAGICE and COM5, and it just pauses > > > >true; the AVR-USB-JTAG requires target power. > > .. just like the Atmel JTAGs - it's for the JTAG's level converter chips
That much I can understand, but it seems like the actual micro inside the USB-JTAG is powered off the target, since you can't upgrade the firmware unless you're connected to a powered target.

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