altos: add 'vidtime', a simple brightness monitor
authorKeith Packard <keithp@keithp.com>
Mon, 7 May 2018 18:26:42 +0000 (11:26 -0700)
committerKeith Packard <keithp@keithp.com>
Mon, 7 May 2018 18:26:42 +0000 (11:26 -0700)
This is a testing tool for video refresh tracking. It uses the mpusb
v3.0 hardware and monitors the phototransistor value, sending 0 or 1
to the USB port when the value changes.

Signed-off-by: Keith Packard <keithp@keithp.com>

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