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Jthorpe
Jthorpe

Reputation: 10204

How to use the "Usage In Use Indicator"

I'm trying to RTFM the HID Usage Tables FOR Universal Serial Bus (USB) v1.22 and the second paragraph of section 14 (Telephony Device Page) has this to say:

Indicators on a phone are handled by wrapping them in LED: Usage In Use Indicator and LED: Usage Selected Indicator usages. For example, a message-indicator LED would be identified by a Telephony: Message usage declared as a Feature or Output in a LED: Usage In Use Indicator collection.

I think this means that there is some way to get the the Telephony state in an output report (the "message-indicator" in their example), but I have no idea from this description how to implement this in a HID report descriptor. Can someone provide an example section of a HID report descriptor that make use of the usage in use indicator as described?

Upvotes: 0

Views: 70

Answers (1)

Jthorpe
Jthorpe

Reputation: 10204

Found example of the Usage in Use Indicator in Example A.10 (p. 144) of an older version (v1.12) of the same document (I would recapitulate the example here, but copying content from the original document is disallowed)

Furthermore, Table 11.6 (General Device Indicators, p.21) of the v1.12 document clarifies the definition of the Usage In Use Indicator and section 3.4.4 (Alternate Types, p. 66) describe the effect of the Usage In Use Indicator.

Upvotes: 0

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