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c46f569a39
This adds an "extra/" directory to hold various experiments and optional programs. With this change, we add a tool that can simulate the lightbar behavior on the build machine. That can be used to experment with variations in the lightbar pattern code without needing to reflash a Pixel with a new EC to see the effect. There is no functional change to the EC code, just a couple of #ifdefs to allow common/lightbar.c to be compiled separately from the EC. BUG=none BRANCH=ToT TEST=make buildall -j cd extra make ./lightbar You may need to install the libxcb1-dev package on your build machine. Change-Id: I847ce7ea97cae792b1de1b91f488819e873b6555 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/199883
47 lines
1.7 KiB
Plaintext
47 lines
1.7 KiB
Plaintext
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This directory is for experiments only. It is not built automatically,
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required, supported, guaranteed to work, or necessarily well-documented.
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The contents may change without warning at any time.
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------------------------------------------------------------------------------
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Lightbar simulator
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------------------------------------------------------------------------------
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Build with "make lightbar". The executable is "./lightbar".
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You may need to install libxcb1-dev or similar.
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This provides a simulation environment for the lightbar task, compiling
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common/lightbar.c from the EC source, but faking the rest of the EC.
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The EC console is on stdin/stdout, delivering all input to the lightbar's
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console command handler (so it prefixes any input with "lightbar"). The
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lightbar itself is displayed in an X window. You can click in that window to
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emulate changes to the battery level, AC connection, and brightness, all of
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which are normally outside the lightbar task's direct control.
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The initial sequence is "S5". Try issuing the command "seq s3s0" to see
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something more familiar.
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Note: the Pixel lightbar circuitry has three modes of operation:
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Unpowered
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When the host CPU is off (S5/G3), all power to the lightbar and its
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controller circuitry is lost.
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On
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When the host CPU is on (S0) or suspended (S3), the lightbar is powered
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again. After every power loss, it will need to be reinitialized by calling
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lb_init() before it can be used.
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Standby
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The lightbar controller ICs can turn off all the LED outputs to conserve
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power. This is the initial state when power is applied. You can turn the
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LEDs off manually by calling lb_off(). When suspended, the controller will
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respond to commands, but the LEDs aren't lit. Turn them on with lb_on().
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