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Is HIBERNATE_WAKE_PIN setting is edge or level sensitive?

John Osen
Genius 3585 points
Other Parts Discussed in Thread: TM4C1231D5PM

I am using a TM4C1231D5PM.

Is the hibernation module wake pin setting edge or level setting?

My program logic is:

  1. Has the user been inactive for >500msec?
  2. Yes, then it is time go hibernate, wake on pin, but first save some data off to EE (about 20msec).
  3. Now, go to sleep.

When interacting with the keys on the target devices, and the user moves from one key to another, there appears to be a small window during where the device calls HibernateRequest, but then does not come out of hibernation even though a key is being pressed.  All keys trigger the wake pin on the TM4C.

My suspicion is that in the 20msec EE update window the user moves to a new key, HibernateRequest is called with the wake pin already asserted.  If the wake function is on transition, then a transition is not seen until the user releases the key and pushes on a key again.  And indeed that is what happens.

I monitor behavior on the CAN bus.  So I know I am enterring the HibernateRequest code, but not enterring main again until I release all keys, the push any key.