MPXM2010D datasheet(11/24 Pages) FREESCALE

11 / 24 page

AN1950

Sensors

Freescale Semiconductor

validcal: ldhx #N2

jsr wrflash

;burn N2 into flash

ldhx #msg05

;and display new current cal values from flash

jsr lcdstro

lda N1

;0mm value

jsr lcdbyto

lda #'/'

jsr lcdchro

lda N2

;160mm value

jsr lcdbyto

jsr del1s

jmp nocalib

;done!

;__________________________________________________________

LEVEL: lda #$01

;===LEVEL=== main routine: displays level, flow & graphics

jsr lcdcmdo

;clear screen

lda #$0C

jsr lcdcmdo

;cursor off

lda #$88

;position cursor at LCD graphics portion

jsr lcdcmdo

;(2nd half of first line)

clra

;and write ascii $00 through $07

fillgfx: jsr lcdchro

;which contain the graphics related to

inca

;40 different readings

cmp #$08

;do all 8

bne fillgfx

LVL:

ldhx #ramfree

;point to 40 pressure readings

lda #$28

;count down from 40

purge: clr 0,x

;clear all those locations

incx

;next (H cannot change: we are in page0 RAM)

dbnza purge

jsr adcbyta

;get averaged A/D reading (i.e. NX)

jsr LfNx

;convert to level and

sta Lgfx

;store in "Level graphics"

LVLwarm: bset 4,porta

bset 5,porta

;LEDs on during this cycle

ldhx #ramfree

;point to 40 pressure readings

mov #$27,RA

;count down from 39

shiftgfx: lda 1,x

;take location+1

sta 0,x

;and move to location+0, i.e. shift graphics left

incx

;next X (once again: we are in page 0, no need to worry about H)

dbnz RA,shiftgfx ;do this 39x

jsr adcbyta

;get averaged A/D reading (i.e. NX)

jsr LfNx

;LX:=(NX-N1)*ConversionValue/(N2-N1)

mov RA,OA

;store result in OA

clr RB

;RB will contain graphic pixels (default=$00)

cmp UnitEmpt

;if <UnitEmpty (preset value = empty or almost)

bcs Lzero

;then "empty" (no pixels)

cmp UnitFull

;if >=UnitFull (preset value = full or almost)

bcc Lsat

;then "full" (pixel $80=bit 7)

clrh

;otherwise determine one of 8 graphic values

ldx UnitDiv

;UnitDiv is roughly full range/8

div

;in order to give 8 values

mov #$01,RB

;but now value has to be converted to pixel

MPXM2010D 数据表(PDF) 11 Page - Freescale Semiconductor, Inc

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