adcutilities.a51

本程序能实现温度的实时采集与显示

;*********************************************************************
; File name: ADCutilities.a51
;
; Copyright 2003 Texas Instruments, Inc. as an unpublished work.
; All Rights Reserved.
;
; Revision History . . .
; Version 1.0
;
; Assembler Version (Keil V2.38), (Raisonance V6.10.13)
;
; Module Description:
; ADC routines to read 24-bit ADC and return value as long integer.
;*********************************************************************
$include (legal.a51); Texas Instruments, Inc. copyright and liability
$include (reg1210.inc)
;*********************************************************************

PUBLIC	unipolar, bipolar

adc_sub 	SEGMENT  CODE
	RSEG  adc_sub

;;;;;;;;;;;;;;;;;;;;;
; unsigned long unipolar(void)
; return the 3 byte adres to R4567 (MSB~LSB)
; unsigned long int with R4=0
unipolar:
	mov	r4,#0
	mov	r5,adresh
	mov	r6,adresm
	mov	r7,adresl
	ret

;;;;;;;;;;;;;;;;;;;;;
; signed long bipolar(void)
; return the 3 byte adres to R4567 (MSB~LSB)
; return signed long int with sign extendsion on R4
bipolar:
	mov	r4,#0
	mov	a,adresh
	mov	r5,a
	mov	r6,adresm
	mov	r7,adresl
	jnb	acc.7,positive
	mov	r4,#0ffh
positive:
	ret
	end