Button Combinations Debounced with jm_debounce?

coryco2

I am trying to debounce multi-button combinations with jm_debounce from the Object Exchange http://obex.parallax.com/objects/489/

It seems to work fine for OR-ing multiple buttons like this:

con

  BTN_A   = 0001 << 18      'pin 18                                 
  BTN_B   = 0010 << 18      'pin 19 
  BTN_C   = 0100 << 18      'pin 20 
  BTN_D   = 1000 << 18      'pin 21 
  BTN_E   = 0000 << 18      'pin 22 
  BTN_F  = 0000 << 18      'pin 23 

  BTN_MASK = BTN_A | BTN_B | BTN_C | BTN_D | BTN_E | BTN_F

  ACT_HI   = 1
  ACT_LO   = 0 

obj

  btns : "jm_debounce"


PUB  Main  |  b

  btns.init(BTN_MASK, 25, ACT_HI)

  repeat

    IF b := btns.getbits(BTN_A | BTN_B) 
         SomeMethod
         
    ELSE
        SomeOtherMethod

but not AND-ing...which is what I want to use it for:

PUB  Main  |  b

  btns.init(BTN_MASK, 25, ACT_HI)

  repeat

    IF b := btns.getbits(BTN_A & BTN_B) 
         SomeMethod
         
    ELSE
        SomeOtherMethod

Can this be made to work for debouncing when trying to detect only when two or more button are pressed in combination?

JonnyMac

You must use ORing to combine single bits into a multi-bit value; by ANDing, you are always setting the mask to 0

if (btns.getbits(BTN_A | BTN_B) == (BTN_A | BTN_B))
    so_something

I think you may be taking the term OR too literally here. In the above snippet the single-bit masks are ORed together to form a multi-bit mask; in this case, both bits must be active for the expression to evaluate as true. In this case the code is only looking for BTN_A and BTN_B to be active at the same time.