I am looking for different option of interfacing to the JTAG port on a PogoPlug board. I have found the picture below which has silkscreen (my board doesn't),
I have used JTAG before, but it was built into the board (using an FTDI chip).
I am not quite sure what type of dongle can I possibly purchase.
I also have a few devices which could be made to do the job, I think I could use
usbprog-jtag code on an Arduino, however that will also require a level-shifter (which I don't have). I have a few other devices, including an mbed board
(cortex-m3) and an Econotag (arm7).
Is there a cross-platform example that I could compile with a customized GPIO mapping header and use that with OpenOCD?
I don't have a parallel port on my new machine, though I don't really feel like
fiddling with parport any more, a USB dongle device is a preference really.
I know that FT2232 chip can be used for JTAG using libftdi, however I only have
a FT232R cable, I suppose that cannot be use really, is that right? Though I manged
to run bitbang command from libftdi. Probably the FT232R is missing some important pins that would make it usable as JTAG tool …
Update 1: I have had a conversation with one person who suggested that there should
be a way of using FT232 in bitbang mode, since you can set TX/RX to be GPIO and
apparently this blog describes how to use the FTDI cable as AVR ISP.
Best Answer
I have decided to go with the Bus Blaster, because it looks like the most flexible and inexpensive JTAG adaptor out there. It features a CPLD which does most of the work and can be re-programmed also.