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;*****************************************
; Program to tx MIDI data with 10Mhz clock
; MIDI Drum-Pads POLYPHONIC
; NOTE MIDI:
; 099h note-on channel 10 "09=on 9=ch10"
; 089h note-off channel 10 "08=off 9=ch10"
; 097h note-on channel 8 "09=on 7=ch8"
; 087h note-off channel 8 "08=off 7=ch8"
;
; 07fh max velocity "0-127" (06e=110)
;
; RA0=out midi
; PA1=down mode PA2=up mode PA3=MidiCh PA4=store
;
; rel1.3 22 02 2003
;*****************************************

PROCESSOR 16f84a
RADIX hex
INCLUDE "P16F84a.INC"
ERRORLEVEL -302
ERRORLEVEL -305
__CONFIG 3FFAH

;*****************************************
;    Port Assignments
;*****************************************

PCL     equ     0x02
STATUS     equ     0x03
PORTA     equ     0x05
PORTB     equ     0x06

;*****************************************
; Variable Assignment Addresses
;*****************************************

dlyreg equ 0x0C
xcount equ 0x0D
xmtreg equ 0x0E
delay1 equ 0x0F
count equ 0x10
drum     equ     0x11 ;store ee
ch_now equ 0x12 ;channel midi 0=10 1=08
ch_comp equ 0x13 ;compare for skip
value equ 0x14 ;input pressed
value1 equ 0x15
value2 equ 0x16 ;input for map ee
delay equ 0x17 ;delay drumpad pressed

drum0 equ 0x18
drum1 equ 0x19
drum2 equ 0x1A
drum3 equ 0x1B
drum4 equ 0x1C
drum5 equ 0x1D
drum6 equ 0x1E
drum7 equ 0x1F

;*****************************************
;   Variable drum sound
;*****************************************

snd00 equ 0x20
snd01 equ 0x21
snd02 equ 0x22
snd03 equ 0x23
snd04 equ 0x24
snd05 equ 0x25
snd06 equ 0x26
snd07 equ 0x27
Tx_FE equ 0x28
Tx_FF equ 0x29

;*****************************************
;   PROGRAM Reset Point
;*****************************************

org 0x00
goto INIT

;*****************************************
; map new sound
;*****************************************

convert addwf PCL
nop
goto convert0
goto convert1
goto convert2
goto convert3
goto convert4
goto convert5
goto convert6
goto convert7

convert0 movf snd00,w
return
convert1 movf snd01,w
return
convert2 movf snd02,w
return
convert3 movf snd03,w
return
convert4 movf snd04,w
return
convert5 movf snd05,w
return
convert6 movf snd06,w
return
convert7 movf snd07,w
return

;*************************************
; drive for call sound
;*************************************

dr_pad clrf count
drum?     incf count,F
     rrf value
     btfss STATUS,C
     goto drum?

      movf count,W
call convert
movwf drum
return

;*****************************************
;   Initialise Software
;*****************************************

INIT bsf STATUS,RP0
clrf PORTA
movlw 0x1E ;xxx11110b bit0=out
movwf TRISA

clrf PORTB
movlw 0xFF ;11111111b
movwf TRISB
bcf STATUS,RP0
bsf PORTA,0

;*****************************************
;   Recall EEp memory
;*****************************************

Rd_ee00 bcf STATUS,RP0 ;read the sndmap from eeprom
movlw 0x00
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd00

Rd_ee01 bcf STATUS,RP0
movlw 0x01
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd01

Rd_ee02 bcf STATUS,RP0
movlw 0x02
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd02

Rd_ee03 bcf STATUS,RP0
movlw 0x03
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd03

Rd_ee04 bcf STATUS,RP0
movlw 0x04
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd04

Rd_ee05 bcf STATUS,RP0
movlw 0x05
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd05

Rd_ee06 bcf STATUS,RP0
movlw 0x06
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd06

Rd_ee07 bcf STATUS,RP0
movlw 0x07
movwf EEADR
bsf STATUS,RP0
bsf EECON1,0x00
bcf STATUS,RP0
movf EEDATA,W
movwf snd07

;*****************************************
;   Main Programme Start
;*****************************************

main clrf PORTB
movf PORTA,W
andlw 0x0E ;in PORTA1;2;3;B00001110
btfss STATUS,Z
call select
btfsc PORTA,4 ;pa4 only store
call ee_rec

movf PORTB,W
main_1      movwf value ;from value the input pressed
      movwf value1
xorlw 0x00
     btfsc STATUS,Z
goto tx_fe
goto tx_nn

tx_fe decfsz Tx_FE
goto main
decfsz Tx_FF
goto main
movlw 0xFE ;on line FE
movwf xmtreg
call txmidi
movlw 0x7F ;127x2 = ca500ms
movwf Tx_FE
movwf Tx_FF
      goto main

tx_nn movf value1,w
movwf value2 ;store ee
andlw 0x01
movwf value
btfsc value,0
call dr_pad
movwf drum0

movf value1,w
andlw 0x02
movwf value
btfsc value,1
call dr_pad
movwf drum1

movf value1,w
andlw 0x04
movwf value
btfsc value,2
call dr_pad
movwf drum2

movf value1,w
andlw 0x08
movwf value
btfsc value,3
call dr_pad
movwf drum3

movf value1,w
andlw 0x10
movwf value
btfsc value,4
call dr_pad
movwf drum4

movf value1,w
andlw 0x20
movwf value
btfsc value,5
call dr_pad
movwf drum5

movf value1,w
andlw 0x40
movwf value
btfsc value,6
call dr_pad
movwf drum6

movf value1,w
andlw 0x80
movwf value
btfsc value,7
call dr_pad
movwf drum7

;*************************************
; Select bit midi channel and go tx
;*************************************

play btfsc ch_now,0 ;selection channel midi 8-10
     goto nch10 ;if0 goto
goto nch08 ;if1 goto

nch10 call noteon0
     call noteoff0
     goto main

nch08 call noteon1
call noteoff1
goto main

;*****************************************
; note-on subroutine
;*****************************************

noteon0 movlw 099h ;note-on ch10
movwf xmtreg
call txmidi
     goto laston

noteon1 movlw 097h ;note-on ch8
movwf xmtreg
call txmidi
     goto laston

laston movf drum0,W ;drum note1
xorlw 0x00
     btfsc STATUS,Z
     goto l1
movwf xmtreg
call txmidi

movlw 06eh ;max velocity1
movwf xmtreg
call txmidi

l1 movf drum1,W ;drum note2
xorlw 0x00
     btfsc STATUS,Z
     goto l2
movwf xmtreg
call txmidi

movlw 06eh ;max velocity2
movwf xmtreg
call txmidi

l2 movf drum2,W ;drum note3
xorlw 0x00
     btfsc STATUS,Z
     goto l3
movwf xmtreg
call txmidi

movlw 06eh ;max velocity3
movwf xmtreg
call txmidi

l3 movf drum3,W ;drum note4
xorlw 0x00
     btfsc STATUS,Z
     goto l4
movwf xmtreg
call txmidi

movlw 06eh ;max velocity4
movwf xmtreg
call txmidi

l4 movf drum4,W ;drum note5
xorlw 0x00
     btfsc STATUS,Z
     goto l5
movwf xmtreg
call txmidi

movlw 06eh ;max velocity5
movwf xmtreg
call txmidi

l5 movf drum5,W ;drum note6
xorlw 0x00
     btfsc STATUS,Z
     goto l6
movwf xmtreg
call txmidi

movlw 06eh ;max velocity6
movwf xmtreg
call txmidi

l6 movf drum6,W ;drum note7
xorlw 0x00
     btfsc STATUS,Z
     goto l7
movwf xmtreg
call txmidi

movlw 06eh ;max velocity7
movwf xmtreg
call txmidi

l7 movf drum7,W ;drum note8
xorlw 0x00
btfsc STATUS,Z
     return
movwf xmtreg
call txmidi

movlw 06eh ;max velocity8
movwf xmtreg
call txmidi

     return

;*****************************************
; note-off subroutine
;*****************************************

noteoff0 movlw 089h ;note-off ch10
movwf xmtreg
call txmidi
     goto lastoff

noteoff1 movlw 087h ;note-off ch8
movwf xmtreg
call txmidi
     goto lastoff

lastoff     movf drum0,W ;drum note1
xorlw 0x00
btfsc STATUS,Z
     goto l11
movwf xmtreg
call txmidi

movlw 06eh ;max velocity1
movwf xmtreg
call txmidi

l11 movf drum1,W ;drum note2
xorlw 0x00
btfsc STATUS,Z
     goto l12
movwf xmtreg
call txmidi

movlw 06eh ;max velocity2
movwf xmtreg
call txmidi

l12 movf drum2,W ;drum note3
xorlw 0x00
     btfsc STATUS,Z
     goto l13
movwf xmtreg
call txmidi

movlw 06eh ;max velocity3
movwf xmtreg
call txmidi

l13 movf drum3,W ;drum note4
xorlw 0x00
     btfsc STATUS,Z
     goto l14
movwf xmtreg
call txmidi

movlw 06eh ;max velocity4
movwf xmtreg
call txmidi

l14 movf drum4,W ;drum note5
xorlw 0x00
     btfsc STATUS,Z
     goto l15
movwf xmtreg
call txmidi

movlw 06eh ;max velocity5
movwf xmtreg
call txmidi

l15 movf drum5,W ;drum note6
xorlw 0x00
     btfsc STATUS,Z
     goto l16
movwf xmtreg
call txmidi

movlw 06eh ;max velocity6
movwf xmtreg
call txmidi

l16 movf drum6,W ;drum note7
xorlw 0x00
     btfsc STATUS,Z
     goto l17
movwf xmtreg
call txmidi

movlw 06eh ;max velocity7
movwf xmtreg
call txmidi

l17 movf drum7,W ;drum note8
xorlw 0x00
     btfsc STATUS,Z
     return
movwf xmtreg
call txmidi

movlw 06eh ;max velocity8
movwf xmtreg
call txmidi

return

;*****************************************
; channel midi / increm / decrem
;*****************************************

select movlw 0x00 ;filter if drum 0x00
xorwf drum,w
btfsc STATUS,Z
return

btfss PORTA,3
goto chge_inc

xorwf ch_comp
btfsc STATUS,Z
return

btfss ch_now,0 ;ch midi select
goto ch08
movlw 0x00 ;0x00 for ch10
movwf ch_now
goto chge_ch
ch08 movlw 0x01 ;0x01 for ch08
movwf ch_now
chge_ch movwf ch_comp

movlw 0xFE ;delay no bounce
movwf delay
loop_2 decfsz delay,f
goto loop_2

chge_inc btfsc PORTA,2
incf drum,f ;+1 to snd0x

chge_dec btfsc PORTA,1
decf drum,f ;-1 to snd0x

loop_0 movf PORTA,W ;one shot
andlw 0x0E ;in PORTA1;2;3;B00001110
btfss STATUS,Z
goto loop_0

;****************************************
; Demo when press for store in eeprom
;****************************************

btfsc ch_now,0 ;select channel 8-10
     goto on_note0 ;if0 goto
goto on_note1 ;if1 goto

on_note0 movlw 099h ;note on ch10
movwf xmtreg
call txmidi

movf drum,W ;drum note
movwf xmtreg
call txmidi

movlw 06eh ;max velocity1
movwf xmtreg
call txmidi

movlw 089h ;note-off ch10
movwf xmtreg
call txmidi

movf drum,W ;drum note
movwf xmtreg
call txmidi

movlw 06eh ;max velocity1
movwf xmtreg
call txmidi
goto main

on_note1 movlw 097h ;note on ch8
movwf xmtreg
call txmidi

movf drum,W ;drum note
movwf xmtreg
call txmidi

movlw 06eh ;max velocity1
movwf xmtreg
call txmidi

movlw 087h ;note-off ch8
movwf xmtreg
call txmidi

movf drum,W ;drum note
movwf xmtreg
call txmidi

movlw 06eh ;max velocity1
movwf xmtreg
call txmidi
goto main

;*****************************************
;   Subroutines tx words midi
;*****************************************

delay2 movwf dlyreg ;delay=1+(n-1)*3+3 cycles
dly2 decfsz dlyreg ;where n is in W reg.
goto dly2 ;n=18 for delay=55 cycles
nop
return

bit_set nop
nop
bsf PORTA,0
     return

bit_clr bcf PORTA,0
     nop
nop
return

txmidi ;return
movlw .8
movwf xcount
bcf PORTA,0
movlw .02
movwf delay1
dly1 decfsz delay1
goto dly1

xnext movlw .20 ;This loop has 25 cycles
call delay2 ;Plus delay2 value.
rrf xmtreg ;number of cycles to
btfsc STATUS,0x00 ;bit set/clear =1+55+9=65.
call bit_set ;number of cycles from
btfss STATUS,0x00 ;bit set/clear =15.
call bit_clr ;Total=80*0.4us=32uS
decfsz xcount
goto xnext

movlw .22 ;This loop requires 65 cycles
call delay2 ;61 +4 so if n=20
nop
bsf PORTA,0 ;delay=4+(n-1)*3=61

movlw .25 ;This loop requires 80 cycles
call delay2 ;75+5 so if n=25
return ;delay=4+(n-1)*3=76

;*****************************************
; organizzation eeprom
;*****************************************

ee_rec movlw 0x00 ;the first start there is drum to 0x00
xorwf drum,w ;and if press PA2 write in to eep 0x00
btfsc STATUS,Z ;this confront if byte is 0x00
return ;
movlw 0x00 ;
xorwf value2,w ;
btfsc STATUS,Z ;
return ;

loop_1 movf PORTA,w ;one shot
andlw 0x08 ;in PORTA4 ;B00001000
btfss STATUS,Z
goto loop_1

btfsc value2,0
goto rec_0
btfsc value2,1
goto rec_1
btfsc value2,2
goto rec_2
btfsc value2,3
goto rec_3
btfsc value2,4
goto rec_4
btfsc value2,5
goto rec_5
btfsc value2,6
goto rec_6
btfsc value2,7
goto rec_7

rec_0 movlw 0x00
goto ee_wr
rec_1 movlw 0x01
goto ee_wr
rec_2 movlw 0x02
goto ee_wr
rec_3 movlw 0x03
goto ee_wr
rec_4 movlw 0x04
goto ee_wr
rec_5 movlw 0x05
goto ee_wr
rec_6 movlw 0x06
goto ee_wr
rec_7 movlw 0x07
goto ee_wr

ee_wr movwf EEADR
movf drum,w ;in drum storing the new note
movwf EEDATA
bsf STATUS,RP0
bsf EECON1,WREN
movlw 0x55
movwf EECON2
movlw 0xAA
movwf EECON2
bsf EECON1,WR
ee_wait btfsc EECON1,WR
goto ee_wait
goto Rd_ee00

org 0x2100
DATA .36 ;bd (referiments decimal keys of keyboard)
DATA .38 ;sn
DATA .47 ;high tom
DATA .45 ;mid tom
DATA .41 ;low tom
DATA .49 ;crash
DATA .44 ;open hh
DATA .46 ;close hh
DATA 0x00
     DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00

DATA 0x00
     DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
DATA 0x00
     DATA 0x00
DATA 0x56 ;Ver1.3
DATA 0x65
DATA 0x72
DATA 0x31
DATA 0x2E
DATA 0x33

     END