Xiaofan Chen wrote:
> Back to the basic, how can OpenOCD to wiggle a pin (forget
> about the PCB Gerber View integration part)? Is this possible?
> I am not so familiar with JTAG. But intuitively I think this is
> already difficult. Without downloading a small program to
> the chips, how do you toggle an I/O pin?
>
>
Take a look a this introduction:
http://www.corelis.com/products/Boundary-Scan_Tutorial.htm
The idea is this: If you have a BSDL file, which identifies the JTAG
commands, the DR scan order (bit order) of all I/O pins... you don't
need much more.
Step 1: Scan in a zero the pin, Step 2: Scan in a one on the pin, Step
3: Repeat.
There is no target code involved.
Same method is used to read the pin..
But - back to the "gerber view" - or something like it... Perhaps a
chip outline.
Maybe like the Xilinix pin allocation graphic view program.
If you can read all the pins. You can draw "logic 1" pins in one color,
and 0 in another.
If you keep reading, you could draw "changing" in a different color.
Take that to the next level - ie: Gerber view - and you can make board
traces blink different colors.
-Duane.
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