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Added LED description table to README

Clara Hobbs 4 years ago
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      README.md

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@@ -173,3 +173,14 @@ configured voltage, the Sink will negotiate it, then turn on its output and
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 blink the LED three times to indicate success.  If the supply cannot output
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 enough power, the Sink will turn its LED on solid to indicate failure, and
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 leave its output turned off.
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+### Status LED descriptions
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+LED State            | Mode  | Meaning
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+---------------------|-------|---------------------------------------------------
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+Fast blink (4/sec)   | Sink  | Negotiating USB Power Delivery contract
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+Medium blink (2/sec) | Sink  | USB Power Delivery contract established, output on
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+Off                  | Sink  | Output on
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+On                   | Sink  | Unable to get configured power from source
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+Slow blink (1/sec)   | Setup | Running in setup mode
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+Fast blink (4/sec)   | Setup | `identify` command run

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