[avr-gcc-list] Re: Intermittent connections with clone JTAG ICE

[Mike Young]

Never mind... I dug (shallowly) into the archives, and quickly found a note 
to check the power supply. The jtag device ships without a jumper to enable 
powering itself from USB. What's odd now is not that it had intermittent 
problems, but that it worked at all. Without the jumper, it draws its power 
from the target board, in this case the Butterfly. The Butterfly ships 
without R402, a 0R jumper that connects its power to the JTAG port. Very odd 
that it should work at all unpowered.

----- Original Message ----- 
From: "Mike Young" <address@hidden>
To: <address@hidden>
Sent: Sunday, November 27, 2005 5:21 AM
Subject: Intermittent connections with clone JTAG ICE


> I bought a clone JTAG ICE from Microcontroller Pros 
> (http://microcontrollershop.com/product_info.php?products_id=1106&osCsid=b6732e459ab35fe55dc115a10aec8f52) 
> thinking to play around with the Butterfly. AVR Studio 4.12 has trouble 
> connecting to it, and once connected, often drops the connection. Avarice 
> doesn't see the device at all. Sometimes, forcing a reset on the Butterfly 
> allows AVR Studio to connect briefly. "Briefly" means a few minutes of