View Single Post
Old 07-30-2013, 09:20   #19 (permalink)
Junior Member
Join Date: Jan 2012
Posts: 25
Member: 1713721
Status: Offline
Thanks Meter: 8
Hello, to identify the port jtag not need any init.
You should locate the ID of the CPU.

I think the probem may be the lack of some component (pull-up resistors etc. ..).
If you look at the picture I posted, lack multiple resistance, which connects several jtag pin to Gnd. After lack a capacitor and a resistor that will Vcc.

I'll put the photo jtag port with its components of a test etrex20/30 Garmin.

Uploaded with

Here is a photo of a model jtag port Garmin 60csx, where you can see the name of 3 of the pins. Tdi, Tms, Tck.

Maybe someone can help us know if you need to place these resistors, or something similar.

Uploaded with
  Reply With Quote
Page generated in 0.05852 seconds with 7 queries