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Removed redundant file.
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Bobbi Webber-Manners
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BIN
applecorn.po
BIN
applecorn.po
Binary file not shown.
268
auxmem.audio.s
268
auxmem.audio.s
@ -1,268 +0,0 @@
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* AUXMEM.AUDIO.S
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* (c) Bobbi 2022 GPLv3
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*
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* Applecorn audio code
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*
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* Sound buffers in aux LC for now
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* Not sure where to move them to
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SNDBUF0 DS 16
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SNDBUF1 DS 16
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SNDBUF2 DS 16
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SNDBUF3 DS 16
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* Get address of sound buffer
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* On entry: X is buffer number
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* On exit: OSIRQWS points to start of buffer
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* Called with interrupts disabled
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GETBUFADDR LDA :BUFADDRL,X
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STA OSINTWS+0
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LDA :BUFADDRH,X
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STA OSINTWS+1
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RTS
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:BUFADDRL DB $00
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DB $00
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DB $00
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DB $00
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DB <SNDBUF0
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DB <SNDBUF1
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DB <SNDBUF2
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DB <SNDBUF3
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DB $00
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:BUFADDRH DB $00
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DB $00
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DB $00
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DB $00
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DB >SNDBUF0
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DB >SNDBUF1
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DB >SNDBUF2
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DB >SNDBUF3
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DB $00
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* Insert value into buffer (INSV)
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* On entry: A is value, X is buffer number.
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* On exit: A, X, Y preserved. C clear on success.
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INSHND PHP ; Save flags, turn off interrupts
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SEI
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PHY
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PHA
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LDY ENDINDICES,X ; Get input pointer
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INY ; Next byte
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CPY #16
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BNE :NOTEND ; See if it's the end
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LDY #0 ; If so, wraparound
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:NOTEND TYA
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CMP STARTINDICES,X ; See if buffer is full
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BEQ :FULL
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LDY ENDINDICES,X ; Current position
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STA ENDINDICES,X ; Write updated input pointer
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JSR GETBUFADDR ; Buffer address into OSINTWS
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PLA ; Get value back
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STA (OSINTWS),Y ; Write to buffer
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PLY
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PLP ; Restore flags
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CLC ; Exit with carry clear
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RTS
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:FULL PLA ; Restore A
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PLY
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PLP ; Restore flags
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SEC ; Exit with carry set
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RTS
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* Remove value from buffer or examine buffer (REMV)
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* On entry: X is buffer number, V=1 if only examination is requested
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* On exit: If examination, A next byte, X preserved, Y=offset to next char
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* Removal: A undef, X preserved, Y value of byte removed
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* If buffer already empty C=1, else C=0
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REMHND PHP ; Save flags, turn off interrupts
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SEI
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LDA STARTINDICES,X ; Output pointer for buf X
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CMP ENDINDICES,X
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BEQ :EMPTY ; Buffer is empty
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TAY ; Buffer pointer into Y
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JSR GETBUFADDR ; Buffer address into OSINTWS
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LDA (OSINTWS),Y ; Read byte from buffer
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PHA ; Stash for later
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BVS :EXAM ; If only examination, done
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INY ; Next byte
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CPY #16
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BNE :NOTEND ; See if it's the end
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LDY #0 ; If so, wraparound
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:NOTEND TYA
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STA STARTINDICES,X ; Set output pointer
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PLY ; Char read from buffer
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PLP
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CLC ; Success
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RTS
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:EXAM PLA ; Char read from buffer
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PLP
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CLC ; Success
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RTS
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:EMPTY PLP
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SEC ; Buffer already empty
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RTS
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* OSBYTE &07 - Make a sound
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* On entry: (OSCTRL),Y points to eight byte parameter block (2 bytes each for
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* channel, amplitude, pitch, duration)
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WORD07 LDA (OSCTRL),Y ; Get channel number 0-3
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ORA #$04 ; Convert to buffer number 4-7
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TAX ; Into X
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INY ; Point to channel num MSB
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INY ; Point to amplitude LSB
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LDA (OSCTRL),Y
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JSR INSHND ; Insert into queue X
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INY ; Point to amplitude MSB
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INY ; Point to pitch LSB
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LDA (OSCTRL),Y
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JSR INSHND ; Insert into queue X
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INY ; Point to pitch MSB
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INY ; Point to duration LSB
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JSR INSHND ; Insert into queue X
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RTS
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* OSBYTE &08 - Envelope
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* On entry: (OSCTRL),Y points to 14 byte parameter block
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WORD08
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* TODO: IMPLEMENT THIS!!!
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RTS
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* Called from Ensoniq interrupt handler - process audio queue
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* Called at 100Hz
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ENSQIRQ INC COUNTER ; Increment centisecond timer
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INC :CNT ; Find every 5th cycle
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CMP #5
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BNE :NOT20HZ
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STZ :CNT
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LDX #3 ; Process four audio queues
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:L1 LDA OSCTIMES,X ; Time remaining on current note
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BEQ :NONOTE ; No note playing
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DEC OSCTIMES,X
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BRA :NOTE
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:NONOTE LDY #$00 ; Zero volume
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LDA #$00 ; Zero freq
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JSR ENSQNOTE ; Silence channel Y
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:NOTE CLV ; Means remove from queue
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JSR REMHND ; Remove byte from queue
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BCS :EMPTY ; Nothing in queue
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PHY ; Amplitude
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JSR REMHND ; Remove byte from queue
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PHY ; Frequency
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JSR REMHND ; Remove byte from queue
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TYA ; Duration
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STA OSCTIMES,X
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PLA ; Recover frequency
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PLY ; Recover amplitude
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JSR ENSQNOTE ; Start note playing
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:EMPTY DEX
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BNE :L1 ; Next audio queue
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:NOT20HZ
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* TODO: Envelope processing on all cycles (AT 100Hz)
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:RTS RTS
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:CNT DB $00 ; Used to determine 20Hz cycles
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COUNTER DW $0000 ; Centisecond counter
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* Time remaining for current note, in 1/20th of second
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OSCTIMES DB $00
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DB $00
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DB $00
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DB $00
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* Initialize Ensoniq
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ENSQSNDCTL EQU $C03C
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ENSQSNDDAT EQU $C03D
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ENSQADDRL EQU $C03E
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ENSQADDRH EQU $C03F
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* Initialize Ensoniq
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* Setup wavetable - one period of a square wave
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ENSQINIT LDA ENSQSNDCTL ; Get settings
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ORA #$60 ; DOC RAM, autoincrement on
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STA ENSQSNDCTL ; Set it
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LDA #$00
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STA ENSQADDRL ; DOC RAM addr $0000
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STA ENSQADDRH ; DOC RAM addr $0000
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LDA #120 ; High value of square wave
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LDX #$00
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:L1 STA ENSQSNDDAT ; 128 cycles of high value
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INX
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CPX #128
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BNE :L1
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LDA #80 ; Low value of square wave
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:L2 STA ENSQSNDDAT ; 128 cycles of low value
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INX
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CPX #0
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BNE :L2
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LDX #$E1 ; DOC Osc Enable register $E1
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LDY #8 ; Four oscillators enabled
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JSR ENSQWRTDOC
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; Fall through
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* Silence all channels
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ENSQSILENT LDY #$00 ; Amplitude
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LDA #$80 ; Frequency
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LDX #$03
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:L1 JSR ENSQNOTE ; Initialize channel Y
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STZ OSCTIMES,X ; No note playing
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DEX
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BPL :L1
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RTS
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* Configure Ensoniq oscillator
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* On entry: X - oscillator number 0-3 , A - frequency, Y - amplitude
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* Preserves all registers
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* TODO: ALWAYS USES OSCILLATOR CHANNEL 0 FOR NOW
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ENSQNOTE PHA
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PHX
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PHY
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LDX #$00 ; DOC register $00 (Freq Lo)
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TAY ; Frequency value LS byte
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JSR ENSQWRTDOC
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LDX #$20 ; DOC register $20 (Freq Hi)
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LDY #$00 ; Frequency value MS byte
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JSR ENSQWRTDOC
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LDX #$40 ; DOC register $40 (Volume)
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PLY ; Amplitude value
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PHY
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JSR ENSQWRTDOC
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LDX #$80 ; DOC register $80 (Wavetable)
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LDY #$00 ; Wavetable pointer $00
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JSR ENSQWRTDOC
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LDX #$A0 ; DOC register $A0 (Control)
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LDY #$00 ; Free run, no IRQ, start
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JSR ENSQWRTDOC
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LDX #$C0 ; DOC register $C0 (WT size)
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LDY #$00 ; For 256 byte wavetable
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JSR ENSQWRTDOC
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PLY
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PLX
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PLA
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RTS
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* Wait for Ensoniq to be ready
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ENSQWAIT LDA ENSQSNDDAT
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AND #$80
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BNE ENSQWAIT
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RTS
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* Write to DOC registers
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* On entry: Value in Y, register in X
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* Preserves all registers
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ENSQWRTDOC PHA
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JSR ENSQWAIT ; Wait for DOC to be ready
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LDA ENSQSNDCTL
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AND #$90 ; DOC register, no autoincr
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ORA #$0F ; Master volume maximum
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STA ENSQSNDCTL
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STX ENSQADDRL ; Select DOC register
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STZ ENSQADDRH
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STY ENSQSNDDAT ; Write data
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PLA
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RTS
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