157 lines
2.5 KiB
ArmAsm
157 lines
2.5 KiB
ArmAsm
; ZZ points to offset from pointer
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;D0 F1 ;0 $9000,$9100,$9200 = A Low (reg0)
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;D1 F2 ;1 $9300,$9400,$9500 = A high (reg1) [top], B high (reg3) [bottom]
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;D2 F3 ;2 $9600,$9700,$9800 = B Low (reg2)
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;D3 F4 ;3 $9900,$9A00,$9B00 = C Low (reg4)
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;D4 F5 ;4 $9C00,$9D00,$9E00 = Envelope Shape (r13) [top], C high (reg5) [bot]
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;D5 F6 ;5 $9F00,$A000,$A100 = Noise (r6), bit7 = don't change envelope
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;D6 F7 ;6 $A200,$A300,$A400 = Enable (r7)
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;D7 F8 ;7 $A500,$A600,$A700 = A amp (r8), bit 5 of r8,r9,r10
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;D8 F9 ;8 $A800,$A900,$AA00 = C amp (r10) [top], B amp (r9) [bottom]
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;D9 FA ;9 $AB00,$AC00,$AD00 = ENV low (r11)
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;DA FB ;a $AE00,$AF00,$B000 = ENV high (r12)
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pt3_write_frame:
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ldy FRAME_OFFSET ; 3
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;=====================
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; Register 0: A fine
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lda A_FINE_TONE
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r0_wrsmc:
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sta $D000,Y
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;==========================
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; Register 1/3: A/B coarse
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lda A_COARSE_TONE
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asl
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asl
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asl
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asl
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ora B_COARSE_TONE
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r1_wrsmc:
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sta $D100,Y
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;====================
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; Register 2: B fine
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lda B_FINE_TONE
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r2_wrsmc:
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sta $D200,Y
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;====================
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; Register 3: B coarse already done
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;=============================
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; Register 4: C fine
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lda C_FINE_TONE
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r4_wrsmc:
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sta $D300,Y
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;=======================================
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; Register 5: Envelope Shape [top] / C coarse [bottom]
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lda C_COARSE_TONE
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and #$f
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sta C_COARSE_TEMP
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lda ENVELOPE_SHAPE
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cmp #$ff
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beq no_envelope
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yes_envelope:
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lda ENVELOPE_SHAPE
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asl
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asl
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asl
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asl
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ora C_COARSE_TEMP
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sta C_COARSE_TEMP
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lda #0
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jmp done_envelope
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no_envelope:
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lda #$80
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done_envelope:
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sta ENV_SHAPE_TEMP
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lda C_COARSE_TEMP
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r13_wrsmc:
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sta $D400,Y
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;=====================
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; Register 6: Noise
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lda NOISE
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and #$1f
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ora ENV_SHAPE_TEMP
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r6_wrsmc:
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sta $D500,Y
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;=====================
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; Register 7: Enable
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lda ENABLE
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r7_wrsmc:
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sta $D600,Y
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;=====================
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; Register 8: a-amp
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lda A_VOLUME
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and #$1f
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sta A_VOL_TEMP
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lda B_VOLUME
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and #$10
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asl
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ora A_VOL_TEMP
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sta A_VOL_TEMP
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lda C_VOLUME
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and #$10
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asl
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asl
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ora A_VOL_TEMP
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r8_wrsmc:
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sta $D700,Y
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;============================
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; Register 9/10: b-amp (bottom) , c-amp (top)
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lda B_VOLUME
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and #$f
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sta A_VOL_TEMP
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lda C_VOLUME
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asl
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asl
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asl
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asl
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ora A_VOL_TEMP
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r9_wrsmc:
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sta $D800,Y
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;=====================
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; Register 10: c-amp already handled
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;=====================
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; Register 11: E fine
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lda ENVELOPE_FINE
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r11_wrsmc:
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sta $D900,Y
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;=======================
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; Register 12: E coarse
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lda ENVELOPE_COARSE
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r12_wrsmc:
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sta $DA00,Y
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;=============================
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; Register 13: already handled
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rts ; 6
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