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; delmain: main delay routine; generates delay equal to H:X x 20us
; -------
delmain: mov #$36,tsc ;stop TIM & / 64
sthx tmodh ;count H:X x 20us
bclr 5,tsc ;start clock
delwait: brclr 7,tsc,delwait ;wait for end of countdown
pulx
pulh
rts ;this RTS serves for all delay routines!
;-------- A/D Routines ----------------------------------------------
; adcbyti: gets single A/D reading from PTA0 and returns it in A
; -------
adcbyti: mov #$00,adscr ;ADC set to PTA0
brclr 7,adscr,* ;wait for ADC reading
lda adr ;result in adr
rts
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
; adcbyta: gets averaged A/D reading from PTA0 and returns it in A
; -------
adcbyta: clr CNT ;average 256 readings
clr RB ;will be addint them up
clr RA ;in RB:RA
do256a: bsr adcbyti
add RA
sta RA
lda RB
adc #$00
sta RB ;16-bit add into RB:RA
dbnz CNT,do256a ;do all 256
lsl RA ;if RA<$80
bcc nochga ;then RB result is correctly rounded
inc RB ;otherwise round off to next value
nochga: lda RB
rts
;-------- LCD Routines ----------------------------------------------
; lcdinit: initializes LCD
; -------
lcdinit: lda #$3C ;set 8-bit interface, 1/16 duty, 5x10 dots
bsr lcdcmdo
lda #$0C ;display on, cursor off, blink off
bsr lcdcmdo
lda #$06 ;increment cursor position, no display shift
bsr lcdcmdo
lda #$01 ;clear display
bsr lcdcmdo
rts
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
; lcdcmdo: sends a command to LCD
; -------
lcdcmdo: bsr shiftA
bclr 4,porta ;RS=0 for command
bset 3,porta
bclr 3,porta ;toggle E
bsr del5ms ;some commands require 2ms for LCD to execute
rts ;so let's play it safe
;- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
; lcdchro: sends a character (data) to LCD
; -------
lcdchro: bsr shiftA
bset 4,porta ;RS=1 for data
AN1950
Sensors
20
Freescale Semiconductor
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