ex15 - debounce.bs2

proteus得一些经典例子

' {$STAMP BS2}
' ==============================================================================
'
' File...... Ex15 - Debounce.BS2
' Purpose... Multi-input button debouncing
' Author.... Parallax
' E-mail.... [e-mail]
' Started...
' Updated... 01 MAY 2002
'
'
' ==============================================================================
' ------------------------------------------------------------------------------
' Program Description
' ------------------------------------------------------------------------------
' This program demonstrates the simultaneous debouncing of multiple inputs. The
' input subroutine is easily adjusted to handle any number of inputs.
' ------------------------------------------------------------------------------
' I/O Definitions
' ------------------------------------------------------------------------------
SwInputs VAR InA ' four inputs, pins 0 - 3
' ------------------------------------------------------------------------------
' Variables
' ------------------------------------------------------------------------------
switches VAR Nib ' debounced inputs
x VAR Nib ' loop counter
' ------------------------------------------------------------------------------
' Program Code
' ------------------------------------------------------------------------------
Main:
GOSUB Get_Switches ' get debounced inputs
DEBUG Home, "Inputs = ", IBIN4 switches, CR ' display in binary mode
PAUSE 50 ' a little time between readings
GOTO Main ' do it again
END
' ------------------------------------------------------------------------------
' Subroutines
' ------------------------------------------------------------------------------
Get_Switches:
switches = %1111 ' enable all four inputs
FOR x = 1 TO 10
switches = switches & ~SwInputs ' test inputs
PAUSE 5 ' delay between tests
NEXT
RETURN