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SOME BASIC FUNCTIONS
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Up and Down the debounce application rst checks for the button to be debounced as up before waiting for it to go down. When the switch has been debounced up, then the Debounce_Down routine is invoked, which waits for the switch to be debounced down, at which point PORTB is complemented, to change the state of the LED output on RB0.
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Loop: Debounce Up Debounce Down comf goto PORTB, f Loop ; ; ; Loop Here
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Wait for Key to Go Up Wait for Key to Go Down ; Toggle the PORTB Value
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In this source code, you ll see that I invoke Debounce with the parameters Up and Down, which is the macro version of the button debounce code I presented earlier. I used a macro for this function simply because it is repeated. By providing a macro for essentially the same code, I avoid having to write it twice, and more important, I avoid the opportunity for errors between the same functions to be repeated. The source code for debounce, which can be found in the code\debounce folder is
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title debounce - Debounce Button input and Toggle LED ; ; This Application waits for the button on RA0 to be released ; (for more than 20 msecs) and then when it has been pressed and ; stays constant for 20 msecs, the LED on RB0 is toggled. The ; Process then repeats. ; ; Hardware Notes: ; _MCLR is tied through a 4.7K Resistor to Vcc and PWRT is Enabled ; A 220 Ohm Resistor and LED is attached to PORTB.0 and Vcc ; A 10K pull up is connected to RA0 and its state is passed to ; RB0 ; ; Myke Predko ; 99.12.04 ; LIST R=DEC INCLUDE p16f84.inc ; Registers CBLOCK 0x020 Dlay:2 ENDC Up EQU 1
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Delay Value Flag Value for Debounce Up
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Down EQU -1 ; Macros Debounce MACRO Direction if (Direction < 0) btfsc PORTA, 0 else btfss PORTA, 0 endif goto $ - 1 movlw movwf movlw movwf bcf 0x0100 - 0x0C4 Dlay 0x0100 - 0x00A Dlay + 1 STATUS, Z
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Flag Value for Debounce Down
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Going Down
Wait for Button Released
Initialize Dlay for a 20 msec Delay
Make Sure that Zero is Reset
incfsz Dlay, f goto $ + 2 incf Dlay + 1, f if (Direction < 0) btfsc PORTA, 0 else btfss PORTA, 0 endif goto $ - 11 btfss STATUS, Z goto $ - 6 ENDM
; ; ;
Button Still Released No - Loop Around Again Zero Flag Set (20 mSecs Past )
End the Macro
__CONFIG _CP_OFF & _WDT_OFF & _XT_OSC & _PWRTE_ON PAGE Mainline of debounce 0
org nop bsf bsf bcf bcf Loop:
PORTB, 0 STATUS, RP0 TRISB & 0x07F, 0 STATUS, RP0
; ; ; ; ;
Make LED on RB0 off Initially Goto Bank 1 to set Port Direction Set RB0 to Output Go back to Bank 0 Loop Here
SOME BASIC FUNCTIONS
Debounce Up nop Debounce Down comf goto PORTB, f Loop
; ; ; ; ;
Wait for Key to Go Up Location for Stopping after Up Debounce Wait for Key to Go Down Toggle the PORTB Value
In the debounce source code, there are a few things I want to point out. The rst is the addition of the nop instruction between the two Debounce macro invocations. This instruction is used as an MPLAB breakpoint for testing the code. You cannot put a breakpoint at a macro invocation, and there would be no way of easily checking whether or not the Debounce Up macro invocation worked correctly unless you were to input a high value on the switch at RA0, wait 20 ms, and then input a low. The nop instruction allows you to hang a breakpoint between the two macro invocations during simulation. For testing this application, I used the asynchronous input, just as was used in the ledon experiment. To test the debounce capability of the Debounce macro, after I had toggled RA0 high, I then waited a few cycles (anywhere from 10 to 15 ms) to test the operation of Debounce. In my PC (300-MHz Pentium II), waiting a full 20 ms takes about 2 minutes. If you have a slower PC, you may want to reduce the loop values while you are simulating the application. In the debounce application, note that I debounce the button high (not pressed) before debouncing it low. The reason for doing this is to make sure that there is a de nite break between button presses. This check is normally required for most applications that process button inputs. The Debounce macro isn t bad for applications that require a single button s input to debounce before proceeding with an application. For applications that cannot spend large periods of time waiting for button inputs, the debounce code will have to be interrupt-based, as is shown in a later experiment.
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