Diff for /wikisrc/projects/project/ledapi.mdwn between versions 1.2 and 1.3

version 1.2, 2011/11/06 14:48:47 version 1.3, 2015/02/20 17:12:46
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 Design and implement a general API for control of LED and LCD type devices on NetBSD. The API would allow devices to register individual LED and LCD devices, along with a set of capabilities for each one. Devices that wish to display status via an LED/LCD would also register themselves as an event provider. A userland program would control the wiring of each event provider, to each output indicator. The API would need to encompass all types of LCD displays, such as 3 segment LCDs, 7 segment alphanumerics, and simple on/off state LED's. A simple example is a keyboard LED, which is an output indicator, and the caps-lock key being pressed, which is an event provider.  Design and implement a general API for control of LED and LCD type devices on NetBSD. The API would allow devices to register individual LED and LCD devices, along with a set of capabilities for each one. Devices that wish to display status via an LED/LCD would also register themselves as an event provider. A userland program would control the wiring of each event provider, to each output indicator. The API would need to encompass all types of LCD displays, such as 3 segment LCDs, 7 segment alphanumerics, and simple on/off state LED's. A simple example is a keyboard LED, which is an output indicator, and the caps-lock key being pressed, which is an event provider.
   
 There is prior art in OpenBSD; it should be checked for suitability, and any resulting API should not differ from theirs without reason.  There is prior art in OpenBSD; it should be checked for suitability, and any resulting API should not differ from theirs without reason.
   
   Milestones:
   
   * a port of OpenBSD's LED tools
   * a userland tool to control LED
   * demonstration of functionality
   * integration into NetBSD
   
 """  """
 ]]  ]]
   

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  Added in v.1.3


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