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Document the firmware version extension

Clara Hobbs 6 years ago
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      docs/console_config.md

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@@ -326,5 +326,10 @@ The device's firmware version number is given in the iSerial descriptor.  The
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 version number follows [Semantic Versioning][].  The serial console
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 configuration interface is the API that the version number describes.
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+Starting with firmware version 1.2.0, the version number can also be read using
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+the firmware version extension: an interface descriptor with class code `0xFF`,
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+subclass code `0x46`, and protocol `0x57` points to a string descriptor with
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+the firmware version.
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+
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 [pid.codes]: http://pid.codes/
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 [Semantic Versioning]: http://semver.org/

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