adcldr.asm

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;********************************************************************
;
; Author        : ADI - Apps            www.analog.com/MicroConverter
;
; Date          : April 2002
;
; File          : ADCldr.asm
;
; Hardware      : ADuC814
;
; Description   : Performs repeated single ADC conversions on ADC0
;                 Adjusts output of DAC0 to vary with LDR 
;		  lnk 6 needs to be in position B
;                 lnk 7 needs to be in position B
;		  lnk 8 needs to be on
;		  lnk 5 needs to be on
;		
;********************************************************************

$MOD814                         ; Use 8052&ADuC814 predefined symbols

CHAN    EQU     1               ; convert this ADC input channel..
                                ; ..chan values can be 0 thru 6
;____________________________________________________________________
                                                  ; BEGINNING OF CODE
CSEG

ORG 0000h

        JMP     MAIN            ; jump to main program
;____________________________________________________________________
                                             ; INTERRUPT VECTOR SPACE
	

;====================================================================
                                                       ; MAIN PROGRAM
ORG 004Bh

MAIN:

; PRECONFIGURE...

        MOV     ADCCON1,#080h   ; power up ADC
        MOV     ADCCON2,#CHAN   ; select channel to convert
	MOV     DACCON,#03DH	; Dac 0  0-5V 12bits
        SETB	EA              ; enable interrupts
        SETB    EADC            ; enable ADC interrupt

; PERFORM REPEATED SINGLE CONVERSIONS...

AGAIN:  MOV     A,#01H		; Delay length
	SETB    SCONV           ; innitiate single ADC conversion
        		        ; ADC ISR is called upon completion
	JNB     ADCI,$
	MOV     DAC0H,ADCDATAH
	MOV     DAC0L,ADCDATAL
	
	JMP     AGAIN	
	
;____________________________________________________________________
END