?? doorbell.asm
字號:
LIST p=16F84 ; PIC16F844 is the target processor
#include "P16F84.INC" ; Include header file
CBLOCK 0x10 ; Temporary storage
tempo
tptrl
tptrh
note
length
pitch
temp
dl1
dl2
ENDC
ORG 0
entrypoint goto initialise
ORG 4
intvector goto toggle
initialise ; Register set up:
clrw ; Zero.
movwf PORTA ; Ensure PORTB is zero before we enable it.
movwf PORTB ; Ensure PORTB is zero before we enable it.
bsf STATUS,RP0 ; Select Bank 1
clrf TRISB ; Port B is outputs
; Set up timer 0 for tone generation
movlw 0x02 ; Prescaler on, internal clocking, divide by 4
movwf OPTION_REG
bcf STATUS,RP0 ; Back to bank 0
; Poll for a button
wait clrf PORTB
wloop btfss PORTA,0
goto playtune0
btfss PORTA,1
goto playtune1
goto wloop
;Routines to play the tunes
playtune0 movlw 0x13
movwf PORTB
movlw 0x50
movwf tempo
movlw tune0 / 0x100
movwf tptrh
movlw tune0 % 0x100
movwf tptrl
goto playtune
playtune1 movlw 0x23
movwf PORTB
movlw 0xA0
movwf tempo
movlw tune1 / 0x100
movwf tptrh
movlw tune1 % 0x100
movwf tptrl
goto playtune
;Subroutine to play a tune
playtune call gettunedata ; Lookup note from tune table
movwf note ; Store the note code
btfsc note,7 ; Bit 7 set => end of tune
goto wait ; Back to waiting for a button press
incf tptrl,F ; Increment the tune pointer
call gettunedata ; Get the note length
movwf length ; Store it
; Play the stored note
; The tune table supports two octaves and 8 note lengths.
playnote btfsc note,6 ; Bit 6 set => rest
goto playwait ; Silence ensues...
movf note,W ; Retrieve the note
andlw 0x3F ; Mask off the pitch index
call pitchtable ; and look it up in the pitchtable
movwf pitch ; Transfer the value to Timer 0
movwf TMR0
bcf INTCON,T0IF ; Clear Timer Interrupt
bsf INTCON,T0IE ; Enable interrupts for Timer 0
bsf INTCON,GIE
playwait movf length,W ; Retrieve the note length
movwf dl1 ; and store it in delay counter 1
loop1 movf tempo,W ; This value sets the timing resolution
movwf dl2
loop2 nop ; Inner delay loop delay
nop
decfsz dl2,F
goto loop2
decfsz dl1,F ; Outer delay loop
goto loop1
bcf INTCON,T0IE ; Timer interrupts off
;Fetch next note/length pair:
incf tptrl,F ; Increment tune ptr
btfsc STATUS,Z ; Test for low byte rollover
incf tptrh,F ; Inc high byte
goto playtune ; Loop for next note
; Routine to fetch data from the tune tables
gettunedata movf tptrh,W ; Set up PCLATH for the jump
movwf PCLATH
movf tptrl,W ; Get low address of tptr
movwf PCL ; Jump off to the table entry
; Pitch lookup function
pitchtable clrf PCLATH ; Clear PCLATH for zero page
addwf PCL,F
retlw 0x11 ;C5 // Midi Code 60
retlw 0x1F ;C#
retlw 0x2B ;D
retlw 0x37 ;D#
retlw 0x42 ;E
retlw 0x4D ;F
retlw 0x57 ;F#
retlw 0x61 ;G
retlw 0x6A ;G#
retlw 0x72 ;A (440)
retlw 0x7A ;Bb
retlw 0x81 ;B
retlw 0x89 ;C6 // Midi Code 72
retlw 0x8F ;Db
retlw 0x96 ;D
retlw 0x9C ;Eb
retlw 0xA1 ;E
retlw 0xA7 ;F
retlw 0xAC ;F#
retlw 0xB0 ;G
retlw 0xB5 ;Ab
retlw 0xB9 ;A (880)
retlw 0xBD ;Bb
retlw 0xC1 ;B
retlw 0xC4 ;C7 // Midi Code 84
retlw 0xC8 ;Db
retlw 0xCB ;D
retlw 0xCE ;Eb
retlw 0xD1 ;E
retlw 0xD3 ;F
retlw 0xD6 ;F#
retlw 0xD8 ;G
retlw 0xDA ;Ab
retlw 0xDC ;A (1760)
retlw 0xDE ;Bb
retlw 0xE0 ;
retlw 0xE2 ;C8 // Midi Code 96
;Interrupt service - toggle the drive polarity to the sounder
;Note that this does not preserve the status bits - be careful,
;and that there is an assumption we are addressing bank 0.
toggle movwf temp
movf pitch,W
movwf TMR0
movf PORTB,W
xorlw 0x0F
movwf PORTB
bcf INTCON,T0IF
movf temp,w
retfie
;Tune Tables
;Must be on even byte boundary
org 0x0080
; Tune 0 Data
; Bach 'Badinerie' from Suite No 2
tune0 retlw 0x17 ;B
retlw 0x78 ;240
retlw 0x1A ;D
retlw 0x3C ;120
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x78 ;240
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x0E ;D
retlw 0x3C ;120
retlw 0x0B ;B
retlw 0xF0 ;480
retlw 0x06 ;F#
retlw 0x3C ;120
retlw 0x0B ;B
retlw 0x3C ;120
retlw 0x0E ;D
retlw 0x3C ;120
retlw 0x0B ;B
retlw 0x3C ;120
retlw 0x0D ;C#
retlw 0x3C ;120
retlw 0x0B ;B
retlw 0x3C ;120
retlw 0x0D ;C#
retlw 0x3C ;120
retlw 0x0B ;B
retlw 0x3C ;120
retlw 0x0A ;A#
retlw 0x3C ;120
retlw 0x0D ;C#
retlw 0x3C ;120
retlw 0x10 ;E
retlw 0x3C ;120
retlw 0x0D ;C#
retlw 0x3C ;120
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x0B ;B
retlw 0x78 ;240
retlw 0x17 ;B
retlw 0x78 ;240
retlw 0x1A ;D
retlw 0x3C ;120
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x78 ;240
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x0E ;D
retlw 0x3C ;120
retlw 0x0B ;B
retlw 0xF0 ;480
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x17 ;B
retlw 0x78 ;240
retlw 0x0E ;D
retlw 0x78 ;240
retlw 0x10 ;E
retlw 0x3C ;60
retlw 0x0E ;D
retlw 0x3C ;30
retlw 0x0D ;C#
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x78 ;240
retlw 0x1A ;D
retlw 0x78 ;240
retlw 0x12 ;F#
retlw 0x78 ;220
retlw 0x12 ;F#
retlw 0x3C ;30
retlw 0x14 ;G#
retlw 0x3C ;65
retlw 0x11 ;F
retlw 0x78 ;270
retlw 0x0D ;C#
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x15 ;A
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x11 ;F
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
retlw 0x15 ;A
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
retlw 0x15 ;A
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x15 ;A
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x11 ;F
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x11 ;F
retlw 0x39 ;115
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x19 ;C#
retlw 0x3E ;125
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x11 ;F
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x39 ;115
retlw 0x1A ;D
retlw 0x3E ;125
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x11 ;F
retlw 0x3C ;120
retlw 0x12 ;F#
retlw 0x3C ;120
retlw 0x1A ;D
retlw 0x3C ;120
retlw 0x19 ;C#
retlw 0x3C ;120
retlw 0x17 ;B
retlw 0x3C ;120
retlw 0x19 ;C#
retlw 0x3C ;120
retlw 0x15 ;A
retlw 0x3C ;120
retlw 0x14 ;G#
retlw 0x3C ;120
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