Drive # vs. select #

[snhi...@gmail.com]

Hi, all.

What is the difference between numbers reported for drive vs. 'select'?  I'm seeing repeated messages about 'select 3', but the emulator and host are setup for drive 1.  I can see where it's coming from in the source code, but I'm not up on the PRU internals.

[David Gesswein]

Select is the select lines on the interface. The encoding changes
with board revision. For A & B its the 4 select lines. I would need to look
further to see which bit is which line. For C & D its two bits for the two
select jumpers. Upper bit is drive 2 jumper and lower bit drive 1 jumper.
Signals are active low and board uses non inverting buffers. The print
exclusive ors the value with one so converts to active high. That means
3 is both select signals are active.

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