chaoskey: Wait for input data to stabilize before using it
authorKeith Packard <keithp@keithp.com>
Tue, 12 Sep 2017 20:40:06 +0000 (13:40 -0700)
committerKeith Packard <keithp@keithp.com>
Tue, 12 Sep 2017 20:40:06 +0000 (13:40 -0700)
The ADC data takes a while to start working after power on; wait for
the range of input values to look reasonable before using the data.

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

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