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Thread: HID Keyboard Device has no Power Management Option

  1. #1
    Junior Member
    Join Date
    Nov 2019
    Posts
    19

    HID Keyboard Device has no Power Management Option

    I want to use Teensy 4.0 programmed as HID keyboard for PC wakeup.
    But I do not see Power Management tab in Device Properties, while usual PC USB Keyboard has this tab.
    So, I could not wakeup PC with Teensy.
    I could not find any differences between Teensy HID Keyboard and ordinary usb keyboard in the Details tab.

    The question is: what is nessesary to activate Power Management tab for Teensy?

  2. #2
    Not sure if this will help, but here's an old thread that you can check out:

    I woke my Mac from sleep with a teensy 3.0

  3. #3
    Junior Member
    Join Date
    Nov 2019
    Posts
    19
    Thanks, daperl
    Setting
    0xA0 or 0xE0 // bmAttributes
    definitelly enables Power Management Option
    but it is not enough.
    USB0_CTL and USB_CTL_RESUME
    are not defined for T4

  4. #4
    Yeah, the control register names seem to be different for T4. But it seems clear from page 2344 of the RT1060 manual that you should be able to resume a connected USB host. Good luck.
    Last edited by daperl; 02-06-2020 at 05:02 PM.

  5. #5
    Junior Member
    Join Date
    Nov 2019
    Posts
    19
    Found a trivial solution:
    https://www.ftdichip.com/Support/Kno...motewakeup.htm
    works even with FT232RL

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