?? doorbell.lst
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MPASM 03.00 Released DOORBELL.ASM 7-9-2002 10:52:24 PAGE 1
LOC OBJECT CODE LINE SOURCE TEXT
VALUE
00001 LIST p=16F84 ; PIC16F844 is the target processor
00002
00003 #include "P16F84.INC" ; Include header file
00001 LIST
00002 ; P16F84.INC Standard Header File, Version 2.00 Microchip Technology, Inc.
00136 LIST
00004
00005 CBLOCK 0x10 ; Temporary storage
00000010 00006 tempo
00000011 00007 tptrl
00000012 00008 tptrh
00000013 00009 note
00000014 00010 length
00000015 00011 pitch
00000016 00012 temp
00000017 00013 dl1
00000018 00014 dl2
00015 ENDC
00016
00017
0000 00018 ORG 0
0000 2805 00019 entrypoint goto initialise
00020
0004 00021 ORG 4
0004 2870 00022 intvector goto toggle
00023
0005 00024 initialise ; Register set up:
0005 0103 00025 clrw ; Zero.
0006 0085 00026 movwf PORTA ; Ensure PORTB is zero before we enable it.
0007 0086 00027 movwf PORTB ; Ensure PORTB is zero before we enable it.
0008 1683 00028 bsf STATUS,RP0 ; Select Bank 1
Message[302]: Register in operand not in bank 0. Ensure that bank bits are correct.
0009 0186 00029 clrf TRISB ; Port B is outputs
00030
00031 ; Set up timer 0 for tone generation
000A 3002 00032 movlw 0x02 ; Prescaler on, internal clocking, divide by 4
Message[302]: Register in operand not in bank 0. Ensure that bank bits are correct.
000B 0081 00033 movwf OPTION_REG
000C 1283 00034 bcf STATUS,RP0 ; Back to bank 0
00035
00036
00037 ; Poll for a button
000D 0186 00038 wait clrf PORTB
000E 1C05 00039 wloop btfss PORTA,0
000F 2813 00040 goto playtune0
0010 1C85 00041 btfss PORTA,1
0011 281C 00042 goto playtune1
0012 280E 00043 goto wloop
00044
00045 ;Routines to play the tunes
0013 3013 00046 playtune0 movlw 0x13
0014 0086 00047 movwf PORTB
0015 3050 00048 movlw 0x50
MPASM 03.00 Released DOORBELL.ASM 7-9-2002 10:52:24 PAGE 2
LOC OBJECT CODE LINE SOURCE TEXT
VALUE
0016 0090 00049 movwf tempo
0017 3000 00050 movlw tune0 / 0x100
0018 0092 00051 movwf tptrh
0019 3080 00052 movlw tune0 % 0x100
001A 0091 00053 movwf tptrl
001B 2825 00054 goto playtune
00055
001C 3023 00056 playtune1 movlw 0x23
001D 0086 00057 movwf PORTB
001E 30A0 00058 movlw 0xA0
001F 0090 00059 movwf tempo
0020 3001 00060 movlw tune1 / 0x100
0021 0092 00061 movwf tptrh
0022 3042 00062 movlw tune1 % 0x100
0023 0091 00063 movwf tptrl
0024 2825 00064 goto playtune
00065
00066 ;Subroutine to play a tune
0025 2045 00067 playtune call gettunedata ; Lookup note from tune table
0026 0093 00068 movwf note ; Store the note code
0027 1B93 00069 btfsc note,7 ; Bit 7 set => end of tune
0028 280D 00070 goto wait ; Back to waiting for a button press
0029 0A91 00071 incf tptrl,F ; Increment the tune pointer
002A 2045 00072 call gettunedata ; Get the note length
002B 0094 00073 movwf length ; Store it
00074
00075 ; Play the stored note
00076 ; The tune table supports two octaves and 8 note lengths.
002C 1B13 00077 playnote btfsc note,6 ; Bit 6 set => rest
002D 2836 00078 goto playwait ; Silence ensues...
002E 0813 00079 movf note,W ; Retrieve the note
002F 393F 00080 andlw 0x3F ; Mask off the pitch index
0030 2049 00081 call pitchtable ; and look it up in the pitchtable
0031 0095 00082 movwf pitch ; Transfer the value to Timer 0
0032 0081 00083 movwf TMR0
0033 110B 00084 bcf INTCON,T0IF ; Clear Timer Interrupt
0034 168B 00085 bsf INTCON,T0IE ; Enable interrupts for Timer 0
0035 178B 00086 bsf INTCON,GIE
0036 0814 00087 playwait movf length,W ; Retrieve the note length
0037 0097 00088 movwf dl1 ; and store it in delay counter 1
0038 0810 00089 loop1 movf tempo,W ; This value sets the timing resolution
0039 0098 00090 movwf dl2
003A 0000 00091 loop2 nop ; Inner delay loop delay
003B 0000 00092 nop
003C 0B98 00093 decfsz dl2,F
003D 283A 00094 goto loop2
003E 0B97 00095 decfsz dl1,F ; Outer delay loop
003F 2838 00096 goto loop1
0040 128B 00097 bcf INTCON,T0IE ; Timer interrupts off
00098
00099 ;Fetch next note/length pair:
0041 0A91 00100 incf tptrl,F ; Increment tune ptr
0042 1903 00101 btfsc STATUS,Z ; Test for low byte rollover
MPASM 03.00 Released DOORBELL.ASM 7-9-2002 10:52:24 PAGE 3
LOC OBJECT CODE LINE SOURCE TEXT
VALUE
0043 0A92 00102 incf tptrh,F ; Inc high byte
0044 2825 00103 goto playtune ; Loop for next note
00104
00105 ; Routine to fetch data from the tune tables
0045 0812 00106 gettunedata movf tptrh,W ; Set up PCLATH for the jump
0046 008A 00107 movwf PCLATH
0047 0811 00108 movf tptrl,W ; Get low address of tptr
0048 0082 00109 movwf PCL ; Jump off to the table entry
00110
00111 ; Pitch lookup function
0049 018A 00112 pitchtable clrf PCLATH ; Clear PCLATH for zero page
004A 0782 00113 addwf PCL,F
004B 3411 00114 retlw 0x11 ;C5 // Midi Code 60
004C 341F 00115 retlw 0x1F ;C#
004D 342B 00116 retlw 0x2B ;D
004E 3437 00117 retlw 0x37 ;D#
004F 3442 00118 retlw 0x42 ;E
0050 344D 00119 retlw 0x4D ;F
0051 3457 00120 retlw 0x57 ;F#
0052 3461 00121 retlw 0x61 ;G
0053 346A 00122 retlw 0x6A ;G#
0054 3472 00123 retlw 0x72 ;A (440)
0055 347A 00124 retlw 0x7A ;Bb
0056 3481 00125 retlw 0x81 ;B
0057 3489 00126 retlw 0x89 ;C6 // Midi Code 72
0058 348F 00127 retlw 0x8F ;Db
0059 3496 00128 retlw 0x96 ;D
005A 349C 00129 retlw 0x9C ;Eb
005B 34A1 00130 retlw 0xA1 ;E
005C 34A7 00131 retlw 0xA7 ;F
005D 34AC 00132 retlw 0xAC ;F#
005E 34B0 00133 retlw 0xB0 ;G
005F 34B5 00134 retlw 0xB5 ;Ab
0060 34B9 00135 retlw 0xB9 ;A (880)
0061 34BD 00136 retlw 0xBD ;Bb
0062 34C1 00137 retlw 0xC1 ;B
0063 34C4 00138 retlw 0xC4 ;C7 // Midi Code 84
0064 34C8 00139 retlw 0xC8 ;Db
0065 34CB 00140 retlw 0xCB ;D
0066 34CE 00141 retlw 0xCE ;Eb
0067 34D1 00142 retlw 0xD1 ;E
0068 34D3 00143 retlw 0xD3 ;F
0069 34D6 00144 retlw 0xD6 ;F#
006A 34D8 00145 retlw 0xD8 ;G
006B 34DA 00146 retlw 0xDA ;Ab
006C 34DC 00147 retlw 0xDC ;A (1760)
006D 34DE 00148 retlw 0xDE ;Bb
006E 34E0 00149 retlw 0xE0 ;
006F 34E2 00150 retlw 0xE2 ;C8 // Midi Code 96
00151
00152
00153
00154
MPASM 03.00 Released DOORBELL.ASM 7-9-2002 10:52:24 PAGE 4
LOC OBJECT CODE LINE SOURCE TEXT
VALUE
00155 ;Interrupt service - toggle the drive polarity to the sounder
00156 ;Note that this does not preserve the status bits - be careful,
00157 ;and that there is an assumption we are addressing bank 0.
0070 0096 00158 toggle movwf temp
0071 0815 00159 movf pitch,W
0072 0081 00160 movwf TMR0
0073 0806 00161 movf PORTB,W
0074 3A0F 00162 xorlw 0x0F
0075 0086 00163 movwf PORTB
0076 110B 00164 bcf INTCON,T0IF
0077 0816 00165 movf temp,w
0078 0009 00166 retfie
00167
00168 ;Tune Tables
00169 ;Must be on even byte boundary
00170
0080 00171 org 0x0080
00172
00173 ; Tune 0 Data
00174 ; Bach 'Badinerie' from Suite No 2
0080 3417 00175 tune0 retlw 0x17 ;B
0081 3478 00176 retlw 0x78 ;240
0082 341A 00177 retlw 0x1A ;D
0083 343C 00178 retlw 0x3C ;120
0084 3417 00179 retlw 0x17 ;B
0085 343C 00180 retlw 0x3C ;120
0086 3412 00181 retlw 0x12 ;F#
0087 3478 00182 retlw 0x78 ;240
0088 3417 00183 retlw 0x17 ;B
0089 343C 00184 retlw 0x3C ;120
008A 3412 00185 retlw 0x12 ;F#
008B 343C 00186 retlw 0x3C ;120
008C 340E 00187 retlw 0x0E ;D
008D 3478 00188 retlw 0x78 ;240
008E 3412 00189 retlw 0x12 ;F#
008F 343C 00190 retlw 0x3C ;120
0090 340E 00191 retlw 0x0E ;D
0091 343C 00192 retlw 0x3C ;120
0092 340B 00193 retlw 0x0B ;B
0093 34F0 00194 retlw 0xF0 ;480
0094 3406 00195 retlw 0x06 ;F#
0095 343C 00196 retlw 0x3C ;120
0096 340B 00197 retlw 0x0B ;B
0097 343C 00198 retlw 0x3C ;120
0098 340E 00199 retlw 0x0E ;D
0099 343C 00200 retlw 0x3C ;120
009A 340B 00201 retlw 0x0B ;B
009B 343C 00202 retlw 0x3C ;120
009C 340D 00203 retlw 0x0D ;C#
009D 343C 00204 retlw 0x3C ;120
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