Page 291 - Making PIC Microcontroller Instruments and Controllers

PBOJECT 6 2e1

Sre Flnal segment to make a finished program-ihe touch panel
(Continuecl)

EIID SEI.ECT
CASE EI.SE
END SE'.ECT
;The following segmenr of code uses lhe lwo r'time counters" to
;turn the two LEDS on
;and off as specined by lhe fasrer/slower buttons. It counts each
; Elrnrng sequence
; independentty and lurns lhe related LED on and off.
lF LCD I=ACTIVE IIHEN
IF STAI-I=BLINR THEN
AI,PEA=AJ.PI'A +1 i
IF lJrPEA>=! 0 THEN ;
AIPEA=o i
TOGCI.A I,CD.ONE
ENDIF
ENDIF
ENDIF
IF LCD,2 EACTIVE THEIiI
IF STAI-2 EBLINK THEDI
BEIA=BEIIA +1 ;
IF BEIA>=|!IMl TXEN
BEIA=0
TOGSI.E LCD_TWO
ENDIF
ENDIF
ENDIF
RETURN

PAITSER! ; pause to de bounce, long
aOR x=1 TO 300
PAUSE 1
NEK![ X
REIIURI|

PAusERl. ; pause to de-bounce, short
FOR X=1 TO 50 ,
PAUSE 1 i
NEXT X ;
REIURN i
END i

EXERCISE
Modify the hardware and the Prcgram 20.1 so tho four columns are detected on lines
B4 to B7, and then use the intenupt capability of these four lines to imprcve the per-
formance of this program by mating its operation crisper