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This is a board designed to receive nucleo64 (and maybe 32) boards
to be test TARGETS. The stm32l1 on _this_ board is reprogrammed via
one of the debug connectors, with appropriate software to be
master/slave/etc to correspond with the DUT. All (most) communication
lines between the two boards are tapped to a 10 pin connector matching
cheap FX2based logic analysers, allowing automatic tests to be written
that use sigrok to check that the signals on the wire match expectations.
Notes on assembly hw1-a:
* 16Mhz crystal, 15pf load caps, and 3k7 i2c pullups
(why don't I have 4k7 0603 resistors lying around? who knows!)
* A power LED wouldn't hurt.
* Adding a red/green user led wouldn't hurt for test pass/fail, even though
it's meant to be autotest
* maybe a fet to turn on/off the i2c pull ups programatically?
(maybe just a single jumper? is there really any need for individual control
of the pullups?)
* move stlink connector 90° or just down and tuck it in, so we can pull the
edge in. It overlaps the buttons on the nucleos, and requires longer
pins than necessary otherwise.
* Add some ground pads for test points, just in general. Test points good,
more test points better.
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