ramp Counter ANALOGUE TO DIGITAL CONVERSION (ADC)

Code:

list p = 16f877
include <p16f877.inc>
BANK0 macro
bcf STATUS,RP0
bcf STATUS,RP1
endm

BANK1 macro
bsf STATUS,RP0
bcf STATUS,RP1
endm

BANK2 macro
bcf STATUS,RP0
bsf STATUS,RP1
endm

BANK3 macro
bsf STATUS,RP0
bsf STATUS,RP1
endm

COUNT EQU 0x22 ;USED FOR COUNTING
RESULT EQU 0x23


ORG 0
NOP
GOTO START
ORG 0x20

START CALL INIT
REPEAT CLRF COUNT ;SET COUNT TO ZERO
RAMP MOVF COUNT,W ;GET COUNT vALUE
MOVWF PORTD ;AND OUTPUT TO DAC
BTFSC PORTA,4 ;TEST COMP OUTPUT
GOTO DONE ;IF NOT ZERo
; CoNVERS ION CoMPLETE
INCF COUNT ;COtINT UP
GOTO RAMP ;RAMP UP

DONE MOVF COUNT,W ;GET COUNT
MOVWF RESULT ;AND STORE
GOTO REPEAT ;DO AGAIN

;PORT INIT ROUTINE
INIT BSF STATUS,RP0 ;SET To BANK 1.
CLRF TRISD ;SET PORT D To OUTPUT
MOVLW 06 ;MAKE PoRT A DIGITAL
MOVWF ADCON1
BSF TRISA,4 ;AND BIT A4 To INPUT
BCF STATUS,RP0 ;BACK To BANK 0
RETURN
END

_________________
M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

Posts: 2715
Have thanks: 74 time

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