tiny_music: inline for code savings
This commit is contained in:
Vince Weaver
parent
93d0e88114
commit
902e1cdcbe
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@ -32,7 +32,7 @@ interrupt_handler:
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inc $0404 ; debug (flashes char onscreen)
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pt3_irq_handler:
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ay3_irq_handler:
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bit MOCK_6522_T1CL ; clear 6522 interrupt by reading T1C-L ; 4
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; see if still counting down
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@ -92,7 +92,7 @@ note_only:
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sty y_smc+1
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out_smc:
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ldx #$00
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jsr pt3_write_reg ; trashes A/X/Y
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jsr ay3_write_reg ; trashes A/X/Y
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; set coarse note A (assume 0)
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; could get extra octave by putting 1 here
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@ -111,22 +111,9 @@ done_update_song:
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; Finally done with this interrupt
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;=================================
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done_pt3_irq_handler:
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done_ay3_irq_handler:
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jmp exit_interrupt
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;=================================
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; Finally done with this interrupt
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;=================================
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quiet_exit:
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stx DONE_PLAYING
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jsr clear_ay_both
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ldx #$ff ; also mute the channel
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stx AY_REGISTERS+7 ; just in case
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exit_interrupt:
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@ -157,28 +144,6 @@ frequency_lookup:
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; .byte $77,$70,$6A,$64,$5E,$59,$54,$4F,$4B,$47,$43,$3F,$00,$00,$00,$00
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; .byte $3B,$38,$35,$32,$2F,$2C,$2A,$27,$25,$23,$21,$1F,$00,$00,$00,$00
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;=====================
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; address in X
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; value in A
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pt3_write_reg:
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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ldy #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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sty MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sty MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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ldy #MOCK_AY_INACTIVE ; go inactive ; 2
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sty MOCK_6522_ORB1 ; 4
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sty MOCK_6522_ORB2 ; 4
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; value
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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sta MOCK_6522_ORA2 ; put value on PA2 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sty MOCK_6522_ORB1 ; 4
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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sty MOCK_6522_ORB2 ; 4
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rts
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@ -52,181 +52,42 @@ MOCK_AY_WRITE = $6 ; 1 1 0
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MOCK_AY_LATCH_ADDR = $7 ; 1 1 1
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;========================
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;========================
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; Mockingboard Init
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;========================
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;========================
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mockingboard_init:
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;=========================
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; Initialize the 6522s
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; set the data direction for all pins of PortA/PortB to be output
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mockingboard_init:
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lda #$ff ; all output (1)
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mock_init_smc1:
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sta MOCK_6522_DDRB1
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sta MOCK_6522_DDRB1 ; set for 6522 #1
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sta MOCK_6522_DDRA1
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mock_init_smc2:
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sta MOCK_6522_DDRB2
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sta MOCK_6522_DDRB2 ; set for 6522 #2
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sta MOCK_6522_DDRA2
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rts
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;===================================
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;===================================
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; Reset Both AY-3-8910s
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;===================================
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;===================================
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;======================
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; Reset Left AY-3-8910
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;======================
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reset_ay_both:
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lda #MOCK_AY_RESET
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reset_ay_smc1:
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sta MOCK_6522_ORB1
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lda #MOCK_AY_INACTIVE
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reset_ay_smc2:
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sta MOCK_6522_ORB1
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;======================
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; Reset Right AY-3-8910
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;======================
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;reset_ay_right:
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;could be merged with both
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lda #MOCK_AY_RESET
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reset_ay_smc3:
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sta MOCK_6522_ORB2
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lda #MOCK_AY_INACTIVE
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reset_ay_smc4:
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sta MOCK_6522_ORB2
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rts
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; Write sequence
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; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
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;=========================================
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; Write Right/Left to save value AY-3-8910
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;=========================================
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; register in X
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; value in MB_VALUE
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write_ay_both:
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; address
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write_ay_smc1:
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
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write_ay_smc2:
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sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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ldy #MOCK_AY_INACTIVE ; go inactive ; 2
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write_ay_smc3:
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sty MOCK_6522_ORB1 ; 4
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sty MOCK_6522_ORB2 ; 4
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;===========
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; 28
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; value
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lda MB_VALUE ; 3
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write_ay_smc4:
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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sta MOCK_6522_ORA2 ; put value on PA2 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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write_ay_smc5:
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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write_ay_smc6:
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sty MOCK_6522_ORB1 ; 4
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sty MOCK_6522_ORB2 ; 4
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;===========
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; 29
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rts ; 6
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;===========
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; 63
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write_ay_both_end:
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;.assert >write_ay_both = >write_ay_both_end, error, "write_ay_both crosses page"
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;=======================================
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; clear ay -- clear all 14 AY registers
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; should silence the card
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;=======================================
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; 7+(74*14)+5=1048
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clear_ay_both:
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ldx #13 ; 2
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lda #0 ; 2
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sta MB_VALUE ; 3
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clear_ay_left_loop:
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jsr write_ay_both ; 6+63
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dex ; 2
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bpl clear_ay_left_loop ; 3
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; -1
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rts ; 6
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clear_ay_end:
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;.assert >clear_ay_both = >clear_ay_end, error, "clear_ay_both crosses page"
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;=============================
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; Setup
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;=============================
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mockingboard_setup_interrupt:
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.ifdef PT3_ENABLE_APPLE_IIC
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lda APPLEII_MODEL
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cmp #'C'
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bne done_iic_hack
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; bypass the firmware interrupt handler
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; should we do this on IIe too? probably faster
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; first we have to copy the ROM to the language card
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sei ; disable interrupts
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copy_rom_loop:
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lda $c089 ; read ROM, write RAM1
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lda $c089
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ldy #0
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read_rom_loop:
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lda $D000,Y
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sta $400,Y ; note this uses text page as
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; temporary data store
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iny
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bne read_rom_loop
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lda $c08B ; read/write RAM1
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lda $c08B ;
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write_rom_loop:
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lda $400,Y
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sta $D000,Y
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iny
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bne write_rom_loop
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inc read_rom_loop+2
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inc write_rom_loop+5
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bne copy_rom_loop
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lda #<interrupt_handler
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sta $fffe
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lda #>interrupt_handler
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sta $ffff
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lda #$EA ; nop out the "lda $45" in the irq handler
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sta interrupt_smc
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sta interrupt_smc+1
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.endif
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done_iic_hack:
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;=========================
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; Setup Interrupt Handler
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;=========================
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; NOTE: we don't support IIc as it's a hack
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; traditionally Mockingboard on IIc was rare
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;========================
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; set up interrupt
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; Vector address goes to 0x3fe/0x3ff
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; FIXME: should chain any existing handler
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lda #<interrupt_handler
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sta $03fe
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@ -252,32 +113,43 @@ done_iic_hack:
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sei ; disable interrupts just in case
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lda #$40 ; Continuous interrupts, don't touch PB7
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setup_irq_smc1:
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sta MOCK_6522_ACR ; ACR register
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lda #$7F ; clear all interrupt flags
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setup_irq_smc2:
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sta MOCK_6522_IER ; IER register (interrupt enable)
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lda #$C0
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setup_irq_smc3:
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sta MOCK_6522_IFR ; IFR: 1100, enable interrupt on timer one oflow
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setup_irq_smc4:
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sta MOCK_6522_IER ; IER: 1100, enable timer one interrupt
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lda #$34
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; lda #$E7
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setup_irq_smc5:
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sta MOCK_6522_T1CL ; write into low-order latch
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lda #$85
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; lda #$4f
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setup_irq_smc6:
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sta MOCK_6522_T1CH ; write into high-order latch,
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; load both values into counter
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; clear interrupt and start counting
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rts
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;===================================
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;===================================
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; Reset Both AY-3-8910s
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;===================================
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;===================================
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;===========================
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; Reset Right/Left AY-3-8910
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;===========================
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lda #MOCK_AY_RESET
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sta MOCK_6522_ORB1
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sta MOCK_6522_ORB2
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lda #MOCK_AY_INACTIVE
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sta MOCK_6522_ORB1
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sta MOCK_6522_ORB2
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init_registers:
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lda #0
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sta SONG_OFFSET
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@ -287,42 +159,79 @@ init_registers:
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ldx #$00
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lda #$00
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jsr pt3_write_reg
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jsr ay3_write_reg
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; set coarse note A
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ldx #$01
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lda #$00
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jsr pt3_write_reg
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jsr ay3_write_reg
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; set mixer ABC enabled
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ldx #$07
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lda #$38
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jsr pt3_write_reg
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jsr ay3_write_reg
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; A volume 14
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ldx #$08
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lda #$E
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jsr pt3_write_reg
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jsr ay3_write_reg
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; B volume 12
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ldx #$09
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lda #$C
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jsr pt3_write_reg
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jsr ay3_write_reg
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; C volume 12
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ldx #$0A
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lda #$C
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jsr pt3_write_reg
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jsr ay3_write_reg
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rts
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;=====================
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;=====================
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;=====================
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; ay3 write reg
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;=====================
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;=====================
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;=====================
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; writes to both chips (so same output to both Right/Left)
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; address in X (preserved)
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; value in A
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; NOTE: it looks like you could interleave things to save bytes
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; but technically this violates the AY-3-8910 spec sheet on
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; finishing accesses in less than 10us (10 cycles)
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ay3_write_reg:
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pha
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lda #MOCK_AY_LATCH_ADDR ; latch_address for PB1 ; 2
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ldy #MOCK_AY_INACTIVE ; go inactive ; 2
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stx MOCK_6522_ORA1 ; put address on PA1 ; 4
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sta MOCK_6522_ORB1 ; latch_address on PB1 ; 4
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sty MOCK_6522_ORB1 ; 4
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stx MOCK_6522_ORA2 ; put address on PA2 ; 4
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sta MOCK_6522_ORB2 ; latch_address on PB2 ; 4
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sty MOCK_6522_ORB2 ; 4
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pla
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; value
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sta MOCK_6522_ORA1 ; put value on PA1 ; 4
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sta MOCK_6522_ORA2 ; put value on PA2 ; 4
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lda #MOCK_AY_WRITE ; ; 2
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sta MOCK_6522_ORB1 ; write on PB1 ; 4
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sty MOCK_6522_ORB1 ; 4
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sta MOCK_6522_ORB2 ; write on PB2 ; 4
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sty MOCK_6522_ORB2 ; 4
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rts
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@ -1,5 +1,8 @@
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; Tiny Mockingboard Player
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; 514B -- Initial implementation
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; 423B -- inline everything
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SONG_L = $70
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SONG_H = $71
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SONG_OFFSET = $72
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@ -36,13 +39,8 @@ tiny_music:
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sta SONG_H
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; assume mockingboard in slot#4
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jsr mockingboard_init
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jsr mockingboard_setup_interrupt
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jsr reset_ay_both
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jsr clear_ay_both
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jsr init_registers
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start_interrupts:
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cli
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