基于pic单片机测温程序分享

;振荡器1MHzR/C

;命令时钟250kHz

include

 

page1macro

bsfSTATUS，RP0;page1

endm

page0macro

bcfSTATUS，RP0;page0

endm

cbLOCk0ch

time1，temp

lo_val，hi_val，msn，lsn

digit1，digit2

count，read

ssave，wsave

flags

endc

;==================================

org00

gotoinit

org04

btfssINTCON，T0IF

gotoend_int

MOVwfwsave

swapfSTATUS，w

MOVwfssave;中断保护

decfcount，f

decfszread，f

gotoint2

calladconv;A/D

MOVlw.16;

MOVwfread

int2MOVfcount，0

btfscSTATUS，Z

bsfflags，0;eot

bcfINTCON，T0IF

end_intswapfssave，w

MOVwfSTATUS;

swapfwsave，f;

swapfwsave，w

retfie;

;==========查表===============

tableaddwfPCL;portb

retlwb’01110111’;0

retlwb’00010100’;1

retlwb’00111011’;2

retlwb’00111110’;3

retlwb’01011100’;4

retlwb’01101110’;5

retlwb’01101111’;6

retlwb’00110100’;7

retlwb’01111111’;8

retlwb’01111100’;9

retlw0

retlw0

retlw0

retlw0

retlw0

retlw0

retlw0

;*********************温度转变******************

lookupaddwfPCL

retlw.99;00

retlw.99;01

retlw.99;02

retlw.99;03

retlw.91;04

retlw.81;05

retlw.73;06

retlw.66;07

retlw.59;08

retlw.52;09

retlw.45;0A

retlw.39;0B

retlw.31;0C

retlw.23;0D

retlw.13;0E

retlw.0;0F

retlw.0;catchfor》f0h

;==========a/d转变值存到temp==========

interpMOVflsn，0;初值

swapflsn，w;swap&save

MOVwfmsn;intow

MOVlw0fh

andwflsn，f;stripoffupperrubbish

andwfmsn，f;stripoffupperrubbish

MOVfmsn，0;reload

calllookup;getvalue

MOVwflo_val;saveit

incfmsn，w;incrementpointer

calllookup;getnextvalue

subwflo_val，w;getdifference&save

MOVwfhi_val

multaddwfhi_val，f;addtocurrent

decfszlsn，f;countdownonmultiplyloop

gotomult

swapfhi_val，w;divideby16

andlw0fh;extractuppernibble

subwflo_val，w;addlovaluetolovaluetogetresult

return

adconvbsfADCON0，GO;startconversion

MOVlw.5;waitdelay10uS

MOVwftemp

decfsztemp，f;loopforawhile

goto$-1

btfscADCON0，GO;testforendofconversion

goto$-1

retlw0

bin_bcdMOVwfdigit1;firstdigit

clrfdigit2;seconddigit

tenlopMOVlw.10

subwfdigit1，w;findouthowmany10’s

btfscSTATUS，C

incfdigit2，f

btfscSTATUS，C

MOVwfdigit1;remainder1’sleft

btfscSTATUS，C

gototenlop

return

;=======================================

initclrfPORTB

clrfPORTA

clrfADCON0

clrfflags

page1

MOVlwb’11110011’

MOVwfTRISA

MOVlwb’10000000’;

MOVwfTRISB;setupportb

MOVlwb’00000100’;/32

MOVwfOPTION_REG

MOVlwb’00000010’

MOVwfADCON1

page0

MOVlwb’00001000’;setupchangeofstateonportb

MOVwfINTCON;towakeup

sleep;shutdown

MOVlwb’11000001’;seta/dinternalrcclock

;channel0，a/drunning

MOVwfADCON0;doit

MOVlw.153;timeoutvalue

MOVwfcount

MOVlw.16;intervaltimerreload

MOVwfread

MOVlwb’10100000’;setupchangeofstateonportb

MOVwfINTCON;towakeup

calladconv;performA/Dconversion

;==================main====================

mainbtfscflags，0;testfortimeout

gotoinit;yessoshutdown

MOVfADRES，0;loadvalue

MOVwflsn;storeforconversion

callinterp;usinginterpolationmethod

callbin_bcd;convertinto2digits

MOVfdigit1，0;loadmsb

calltable;convertinto7segmentformat

MOVwfPORTB;sendtodisplay

bsfPORTA，2;enablecharacter

btfssTMR0，6;testbit

goto$-1;loop

bcfPORTA，2

MOVfdigit2，0;loadlsb

calltable;convertinto7segmentformat

MOVwfPORTB;sendtodisplay

bsfPORTA，3;enablecharacter

btfscTMR0，6;testbit

goto$-1;loop

bcfPORTA，3

gotomain

end