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这是个 nesasm 3.2 入土教程, 感兴趣的可以研究下
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以下是主框架代码:1 m& f1 \6 w0 @% O) ~( l
- ;======================================================================
6 G0 G9 S6 Z! P - ;文件头
6 P3 i+ m' P5 `; { - NES_16KB_PRG_SIZE = 8 ;16KB PRG大小数量) x) P) r+ w6 m. H
- NES_8KB_CHR_SIZE = 1 ;8KB CHR大小数量; d. o5 ~0 E. o8 ~, R9 @1 k) S- Z
- BANK_DATA_MASK = NES_16KB_PRG_SIZE * 2 - 1 ;bank号掩码
0 X: a6 {! L3 U5 w - ;======================================================================
/ S" O8 M- C- i - PRG_DATA_BANK_C000 = NES_16KB_PRG_SIZE * 2 - 2. l' _* U# C+ U
- PRG_DATA_BANK_E000 = NES_16KB_PRG_SIZE * 2 - 1
/ }6 r* p e9 T/ i6 n |5 F) B- \ - ;======================================================================5 k, i5 d0 G. d, w+ J6 `
- RESET_BANK = NES_16KB_PRG_SIZE * 2 - 1- a% y2 k* K2 ]! k& s7 }
- RESET_ADDR = $E000 ;主程序起始地址
7 Z. Q, }0 j) K2 u& | - ;======================================================================
5 [+ O$ l' [+ `$ x - .INESPRG NES_16KB_PRG_SIZE ;16KB PRG 数量, $01-$EF8(1-3832),即16-61,312 KB# Y1 ?6 J0 i6 p: H; }
- .INESCHR NES_8KB_CHR_SIZE ;8KB CHR 数量,$01-$EF8(1-3832),即0-30,656 KB
# q7 n' f! W# `: C; e - .INESMAP 4 ;Mapper号 (0-4095)
* Z4 V% y! I1 v3 h6 ]2 f - .INESSUBMAP 0 ;子Mapper号 (0-15)
& B X" @0 {$ S% Y& e/ |3 l& o; f - .INESMIR 0 ;命名表镜像 (0: 水平 1: 垂直 2: 四屏)
3 j3 H7 n, N( d5 J1 \* x& ] - .INESBAT 0 ;指定是否存在电池备份 (0: 不存在 1: 存在)
% `7 B7 m' D4 T$ h5 N - .INESPRGRAM 0 ;指定 PRG RAM 大小 (大小 = 64字节 << 计数)9 A% N- b2 F3 A4 I
- .INESPRGNVRAM 0 ;指定 PRG NVRAM 大小(大小 = 64字节 << 计数)# }/ A( M K$ i! O. w5 q) Q- U
- .INESCHRRAM 0 ;指定 CHR RAM 大小(大小 = 64字节 << 计数)
: o* a! c2 B* \, W! B - .INESCHRNVRAM 0 ;指定 CHR NVRAM 大小(大小 = 64字节 << 计数); p, K( P- W% u- n; w3 K
- .INESTIM 0 ;指定时序 (0: NTSC, 1: PAL, 2: 多区域, 3: Dendy)" H+ t1 A8 g, i, T* s7 |7 r; o6 P
- ;======================================================================
3 k) U0 u1 e, {& ]8 L7 B - .INCLUDE "fc_demo_config.asm" ;全局配置( ?( @4 q: |: d9 ~/ r2 z3 W8 f+ M# S
- .INCLUDE "fc_demo_constant.asm" ;NES常量
1 y4 z# T3 ~; @; Q7 a. _ - ;======================================================================
7 e- F% d' Y+ a9 h' w# g* j - ;音乐配置
5 }8 S Y7 k7 t/ e* J& Z' { - .IF 0 = MUSIC_THEME
: X P+ x( {& I2 i. X - .INCLUDE "data/music/Gremlin 2/config.asm"
/ t a( {- v# [1 g, K - .ENDIF! }7 x/ n+ l7 }% ^5 c2 f5 ]8 \3 s
- ! {+ A/ m7 ?* ^! j+ A' h
- .IF 1 = MUSIC_THEME
. V6 }0 d' U8 l1 |. ~6 _& o3 K/ e - .INCLUDE "data/music/Raf World/config.asm"
; |# s: a2 g/ M6 t# M - .ENDIF6 |: g% L& k( q( _8 A
- v. I/ h6 f8 S1 Q
- .IF 2 = MUSIC_THEME
! \- X- U' |; f. U& d - .INCLUDE "data/music/Ninja Gaiden 3/config.asm"$ @7 ~# Y) E. |/ K" M, n4 z4 Z% o
- .ENDIF+ \ V% w$ H2 W3 x6 y
) Q5 i2 g" _! ]. b" ]+ N- ;======================================================================
0 g) G' m! y6 C( e - ;引用CHR图像数据
; e( m% h8 M+ e: A1 m, S4 @ - .BANK NES_16KB_PRG_SIZE * 2; g, G5 U% p9 S0 a( l8 e
- .ORG $0000
* ^8 b1 F* n2 `+ W! }$ a - .INCBIN "data/bkg.chr"- @5 b3 u7 P' [" O
- .INCBIN "data/sp.chr"& \+ a! R0 D3 a: Y$ S
- 0 l5 b5 m* H2 {
- ;======================================================================
; |) W* P5 x8 B6 y - .BANK PRG_DATA_BANK_E000 & BANK_DATA_MASK;设置程序所在Bank
% O0 G5 r6 N4 ` - .ORG RESET_ADDR
0 G' ?% N7 f% O: }& A2 u9 D - ;======================================================================
8 ]4 b4 h0 ]% O4 R! k - ;引用其他源文件
" N: T& z/ r: T4 a4 [1 z, n4 B - .INCLUDE "fc_demo_ppu.asm" ;PPU处理: R$ `: E- \) y2 a' G2 i T0 f. s$ z
- .INCLUDE "fc_demo_joysitck.asm" ;手柄处理
1 Y. ]9 R, j, ?4 z6 \2 Z - .INCLUDE "fc_demo_static_text.asm" ;静态文本处理( s- j% ?: z/ b* s& }3 z6 X4 W+ l
- ;======================================================================
$ H; g% a% o8 y) h - ; {: W- v5 T+ k3 a4 a- E* F
- ;======================================================================
8 J. R, w" |( g3 G7 O! j% T - ;等待VBlank到来: }. ~% H4 `9 G% k$ l5 [
- Wait_For_VBlank# G( Y, l7 T2 y$ d1 e0 ^6 {
- LDA PPU_STATUS
* ^) i" ^/ J5 N& K! D. G - BPL Wait_For_VBlank
; K m$ B; v0 l$ X `1 Z1 I4 b - RTS
j7 c! t7 ^( u$ E- w - - K% T6 r; X+ @, V$ V0 ?- R7 x
- ;======================================================================" u' ]# n9 O g1 a# p( r
- ;调色板初始化
# n8 [; z9 v7 ^ ]' {/ n - Palette_Init
! \8 W- L1 Z( H- ~: R8 e1 G4 e; O - LDA #$3F
1 H, a" \! o+ R - STA PPU_ADDRESS
3 g( i8 d7 V" n! m$ J - LDA #$00" t! i9 A7 P/ N. ~
- STA PPU_ADDRESS7 h. I, D1 O$ U+ y# ] T4 C$ i) k- M
- LDX #$00
8 t+ [( _( m. ?: L5 _" @ - LDY #$20
0 e% t3 Z6 X& I0 S: W# W, J - .Write_Data" @* P$ N) y8 `2 ^) h2 b- S* ~
- LDA Palette_Data,X
" M# M, f" J2 Z- e& U( ]* `9 Q - STA FC_PPU_Pal_Addr,X0 V. J) A& `& a8 j( f& Z: m% c
- INX/ R$ p, \- M9 t
- DEY/ a. o6 K: o5 _$ q
- BNE .Write_Data* l" l$ J6 o& q
- .End
* O- ^( @. T1 o& D; X - RTS( D! o7 n$ q: Z/ B% _7 T2 j
# V9 q) @9 x) G0 m- ;----------------------------------------# b+ w$ T% r6 ?2 G9 |- m G
- ;调色板数据) Y3 m4 V& i* c2 ^7 Z4 d
- Palette_Data
" k5 l7 B# ?: Q: G `: k$ ]) f; o - .HEX 0F 20 32 02 0F 20 32 0F 0F 20 32 26 0F 1B 0F 1B/ F! E% m" h. t$ a8 \, D4 m1 h; F
- .HEX 0F 21 27 22 0F 24 24 24 0F 21 21 21 0F 22 22 22! Y7 J- m$ P0 w& C
-
( V' t; @$ }: m' ^$ s - ;======================================================================
0 {$ b- o8 c( g5 m1 p - ;命名表清空) U: i7 X! w: I0 ~" u) ~/ S) A
- Nametable_Clear
! O# D' J, } I; f0 u/ M - LDA #$20
! n" w R2 B9 X. t7 @& W - STA PPU_ADDRESS5 }' @7 J9 y2 ^
- LDA #$00
+ |. t( V& U! X2 u! d - STA PPU_ADDRESS
2 e2 ^$ |) S m% z7 [ - LDA #$00
1 j6 d- n+ ] \6 c, g - LDX #$00% z. H; z& `6 z7 i
- LDY #$08 X1 G w, j7 M& {3 X w
- .Write_Data: S2 f! A4 o# }! D7 P6 v
- STA PPU_DATA p3 ^* ]: _: ~+ R. B' f
- INX
: C& O( P' E* ]% N5 F4 b - BNE .Write_Data
0 m/ s+ ]5 e: O: [$ l8 ^ - DEY& q( s: x5 n: ~$ |' p. V! h6 _2 X! B
- BNE .Write_Data& _$ q N( P1 @
- .End
l+ J) s$ L* k$ C8 s, \ - RTS
+ I2 P+ R2 R; W( f, w7 \0 j
/ m6 b$ o- w H% U9 A& @- ;======================================================================
+ h- F$ F; w! U3 K) |+ ` - ;音乐曲目切换$ I5 `) y/ `* N; F
- Music_Select_Process
. H y" w" o( `8 T" C' ~3 ]2 H
/ D% W+ a; {2 V, {- .Pre_Music;上一曲
- P. E. m2 c9 y2 w! A! p - LDA FC_Gamepad_Once: ], h& p4 ~ E( }& z7 |
- CMP #JOY_KEY_LEFT
$ w6 i, I' |4 M( m2 U( d - BNE .Next_Music
$ }* I: I# n% u- ] - JSR Music_Play_Pre- [6 F/ A) L+ v4 S& i; A# p
- .Next_Music;下一曲7 q6 m2 X4 [( \9 s' X" u6 _% p
- LDA FC_Gamepad_Once
. P* U. e# C3 ] - CMP #JOY_KEY_RIGHT- v+ Y% x. {* N5 ~( P! j1 g# p
- BNE .Next_10_Music
% ^! S4 a6 q) ^$ f) t - JSR Music_Play_Next# P! N3 M1 x2 e+ P Z
- .Next_10_Music;上10曲
0 N" X1 I6 k, R4 h5 { - LDA FC_Gamepad_Once5 I# T8 K a: A
- CMP #JOY_KEY_UP
& ^7 N6 E9 E3 ]) s- h: |+ e" Y - BNE .Pre_10_Music
% N, X% f2 p/ e$ S. g9 F' [; r - JSR Music_Play_Next_105 d" M0 S: Z6 S: p) T" M
- .Pre_10_Music;下10曲- ]3 d# y8 A) d
- LDA FC_Gamepad_Once; b5 h) }8 q: O' K- H
- CMP #JOY_KEY_DOWN
* w* i& G1 ]8 b+ ]# m3 j7 v - BNE .Reset
$ ^8 L) j8 d. D) K' ^7 M5 ^ - JSR Music_Play_Pre_10
0 p' X& E' i% r: o s6 O - .Reset;重播当前曲目; d& b- f; x) W, c, y" [! N% ~1 X
- LDA FC_Gamepad_Once1 E1 ^; m& I/ t: H
- CMP #JOY_KEY_START2 M6 H: G- d) P, t0 V. k! l/ b
- BNE .End
7 ?1 C* j0 }4 u7 c) K7 {6 w3 j) ^ - LDA FC_Music_Index) W8 J+ _& t* O8 Q. I
- JSR Music_Init_Process, t1 V. `/ u2 f7 n; x) l. m2 [
- .End' e% E2 L* [# f$ n; u
- RTS. V: I5 Z4 r1 j+ ~! q+ a3 N
8 y4 [# S4 w1 H: {/ O- ;----------------------------------------------------------------------% L6 F3 F$ z m5 z
- ;播放上一曲
4 w( Z6 i ^) t* Q - Music_Play_Pre
( M& `# P O) s, v" ? - LDA FC_Music_Index! _5 M1 w7 p4 m
- BEQ .End
. l- u2 a# |7 l" } - DEC FC_Music_Index7 h1 S) l8 Z( T" Q# ]8 @. C+ z
- LDA FC_Music_Index3 z5 \6 V' I1 J N) N
- JSR Music_Init_Process1 o6 n" y8 E5 s6 T/ Q+ V
- .End" K- R' j: e& Y1 z" U
- RTS; d: l. N5 z' P) d5 }: s0 H
- ;----------------------------------------------------------------------/ r { M8 D$ S6 H
- ;播放下一曲
/ G8 C; q; r: W' _" c - Music_Play_Next7 Q" S+ N7 } G& s1 ?" n
- LDA FC_Music_Index
. ~, D& l0 @$ a. I% q - CMP FC_Music_Max_Index
4 Y! W) X* d W, W; F. ~* |4 j1 m - BCS .End
, w! A u' H4 f4 C, N6 B+ k - INC FC_Music_Index4 ^( f, a3 }% M- R
- LDA FC_Music_Index! y* x. k+ G0 U8 d2 Z
- JSR Music_Init_Process
3 t3 f) d# |; E8 B9 @ - .End
9 W9 m. z" d; V+ a9 z% L, b* G2 J - RTS- z3 `+ u0 e9 r8 K; K
1 [3 Y+ ]: {" g* L, Q- ;----------------------------------------------------------------------/ g# H2 T3 \# `, ]! q
- ;播放上10曲( C( x( V* l3 s& z3 X" l0 Z& ]
- Music_Play_Pre_10
9 p- ^3 u6 ?6 X, O - LDA FC_Music_Index3 J0 E1 V# g. K/ Y; p
- BEQ .End: R V; d/ F8 A3 S# d b0 r
- SEC
( i( t |6 A+ G0 z' `* u - SBC #10
. p ~2 u/ Z+ n$ S; U* Z& ^! Q* B - BCS .Pre_10
! G8 J! g- C; [ - LDA #$00& i. p( V1 f. }- e- [5 D# b
- .Pre_10
5 h$ g9 q" ]: {! G - STA FC_Music_Index
# v, ~) K8 f& x# x( | - JSR Music_Init_Process
( q1 Z1 `# e" q! n - .End0 l6 T, t# B3 O7 ]7 r2 e2 C
- RTS9 u) u9 J4 F) j& Q) [- d1 }
- ;----------------------------------------------------------------------
# Z! y: ^+ s: h - ;播放下10曲
! n" E- f' |$ G9 k - Music_Play_Next_10' I# }& |2 z7 H9 F5 z% t: M* E
- LDA FC_Music_Index( h/ m9 H8 t. i9 A9 |% y0 f
- CMP FC_Music_Max_Index7 f( I: A& z6 }
- BCS .End+ O T' S# h( `: L- u9 ]
- CLC
# B/ H2 _! M4 m- H8 Y: v! d1 z6 ? - ADC #10; {: f1 z) S7 }; u
- CMP FC_Music_Max_Index
, F1 P' `: X3 a- S9 K - BCC .Next_10* G$ z2 k- `) M. x9 D2 U
- LDA FC_Music_Max_Index) h R' S8 C( ?" V! c( i0 f0 }
- .Next_10
: O9 q2 }7 O- J2 c$ F - STA FC_Music_Index1 ? u ^5 [( u4 S
- JSR Music_Init_Process" @: }7 c/ ?# q \
- .End
/ M& z2 s* A* ~) z% a i - RTS
7 w5 a% I6 ?5 s" x
# T) m X5 V' O0 X- ;----------------------------------------------------------------------
1 n1 t& @" e5 t" f1 V: ~ - ;8位十六进制转3位十进制制' [' d9 Z# S: g5 h6 |( ]
- Hex8ToDec
! d# U) e3 W! S( y - STA FC_Dec_Data_1: R- F2 x1 g& H
- LDA #$00
6 Y. |1 S# C1 C5 i - STA FC_Dec_Data_100
( l/ @" k1 v" j5 Z- r. X - STA FC_Dec_Data_10
# G9 `# ~0 d" V! r - LDA FC_Dec_Data_1% u" o; G+ ~. G* y9 T6 r1 Z
- .Convert_100, S+ S& Y8 i; p9 m) l
- CMP #1005 Q0 J" [+ P$ |; S. p: s3 e
- BCC .Convert_10" n' f* Q8 z4 |9 R, e, ~
- SEC
7 M% ?$ h s* j4 T5 x9 u$ p - SBC #100, A& U) L g W7 \/ T
- INC FC_Dec_Data_100
/ i( }& m% I$ z4 L9 \ - BNE .Convert_100
" [- g: f: {! o: r# j, t - .Convert_10
+ W3 v0 c/ h( E' ?$ J( O - CMP #100 B" ]* b/ Q+ X7 ^+ m) H
- BCC .End% d% w) _7 e) b- m; l( Q* g
- SEC
7 _8 t1 }9 j- I5 z) X) U4 V! w - SBC #10
/ G7 O& I3 k3 F- H& y9 I: B, b' N3 Z - INC FC_Dec_Data_105 u& |, X" `' Z
- BNE .Convert_10' R) ~$ S6 a% }
- .End* D: u8 M9 w# n1 e
- STA FC_Dec_Data_1
) O" u* ?1 Y7 x - RTS! d* w q: M3 g0 [& Y; f6 v, k2 g" I, A
( C1 S/ A0 X/ K9 W- ;----------------------------------------------------------------------4 Y6 ?8 y7 I8 q* D
- ;显示曲目信息- Z- M5 X; O& K* X; ^% s" K1 F
- Music_Info_Display
% w- W% C& a& ^! M: [$ s - LDX FC_PPU_Buf_Count
0 U Q* h3 d* J- s* O9 K: T7 B - LDA #PPU_WRITE_MODE_CNT_LINE9 D: \' l4 M3 v" | P _% ]
- STA Use_PPU_Buffer,X
2 p' y+ l# [/ s: H: B0 ^ - INX
! ]8 S8 ~3 ~% z I: [ -
' f B' v# x% L, L7 A, A - LDA #>MUSIC_INFO_POS+ O8 h/ d8 @! j3 e
- STA Use_PPU_Buffer,X
1 E9 \8 X1 R7 n; P) Y - INX5 ^# H' F6 ?2 M" ]% j8 p) b4 f# `
-
1 }9 c1 s5 n! v9 D/ _/ V - ;居中
' m) A8 R3 C* z2 H/ s - LDA #<(MUSIC_INFO_POS & $E0) + (32 - 5)/2
6 d; v3 X: s& Y: z5 i# c4 u( x4 g - STA Use_PPU_Buffer,X+ h5 L: ^& X9 {5 {% f
- INX+ ?. r% ~, `2 d% T% x: l# u3 n+ ]
-
: ]* B8 m; O P: A - LDA #$05
6 ]- q6 W2 ?/ n: Y- _+ k - STA Use_PPU_Buffer,X* \! D. v% z0 }. [9 z1 K, Z( q; k
- INX% u8 k% h- v) P
- + a+ K, F! M% Y
- LDA FC_Music_Index
) T! d* Q6 F$ x2 ?1 B, [ - CLC1 I% n) V& X# R. q% i- h$ g
- ADC #$01
, \) [* K9 F& Y, x* d! i& ` T - JSR Hex8ToDec5 n$ t _) C1 b1 P" ] h+ k; U
- 9 A1 `6 B) H3 C! @- {1 y& ~8 q
- LDA FC_Dec_Data_10! K. h" A+ l5 e3 i* r( @, w
- CLC! Z* \2 @5 t; T" f& J/ Q% y
- ADC #'0', M l; a8 ?" ~. l, Q, n; c+ x* n
- STA Use_PPU_Buffer,X+ r( a) a1 G5 h
- INX
: G) ?0 \/ c+ O! b0 ~ - ( U& g# y! B- z0 y) ~) k
- LDA FC_Dec_Data_12 J& V- W1 V- P" W- t6 j! o
- CLC
$ A) X2 N7 Z) K, A: r% n - ADC #'0'0 U) i# v. E# j: O5 {8 Z
- STA Use_PPU_Buffer,X
# D' e3 v" ] ^- Q - INX
' S$ J9 c' x. p' E: e& b3 S -
$ |. h( T9 w% v8 ]% a - LDA #'/'. x) `+ U2 O& ~3 s/ H
- STA Use_PPU_Buffer,X, e- o1 d! ]* n8 e& _% a% I! C
- INX
" b' p3 g7 S4 N8 S- ~* J- h -
, ?2 O+ z6 t4 Q5 W. ~ - LDA FC_Music_Max_Index
" \& S9 r$ @5 `# ^4 @& D - CLC
; o' r: O/ x! s& `. ? - ADC #$014 I( X5 x* |* Q' A) y& n" P
- JSR Hex8ToDec
; n) |1 X6 c& ~" \7 E -
( G8 c; B/ `' F: l* V5 y! e! R - LDA FC_Dec_Data_10
, N# r# \6 T4 T - CLC, i: u% x T- c# t; u# h: k" s# H
- ADC #'0'* }+ Y$ ~ W" W8 `; r5 M/ E
- STA Use_PPU_Buffer,X8 g' I5 E/ {* K1 v2 [ k
- INX
; B$ X& Y. Z, b5 Z" H; Y -
' x/ S6 Q3 E% \8 M - LDA FC_Dec_Data_1
3 H$ @; Z+ A4 ] - CLC) H E, Q! A o% W8 U
- ADC #'0' D7 {6 i+ {" L0 ` g& Q, L$ J7 \
- STA Use_PPU_Buffer,X: ^- o' {, }6 g% y% G! d
- INX
6 B+ v: ]& B1 J. O& ?2 ^ - ) s! @& V) ~) I4 J, z/ ~
- .End% f% T2 `" b/ {1 v+ \1 i
- STX FC_PPU_Buf_Count
' i" O1 W& Z/ ~% I3 { - RTS
( s+ {% b6 d2 F2 L - ) d f3 p* R. V# w4 u- Y& @
- ;----------------------------------------------------------------------, T1 H4 b2 p6 u
- ;音乐曲目初始化处理
( b+ s" `2 [. @ - Music_Init_Process( l2 X, o1 ?$ ^' {" H
- PHA
5 J: L, ^$ |! W' h ^ - JSR Music_Clear_Process
7 g. N4 A# @; L - LDA #$1F/ B0 F6 d5 q1 G& n# m
- STA $4015
- l# g9 {/ S& `: J - PLA4 ~9 ~. L: P2 l9 b! u
- JSR Music_Init_Addr3 c/ L$ w2 x- q! c! V4 ]( P
- JSR Music_Info_Display
* _' h3 N0 p- l# w1 D( Z - RTS
& {" j- l4 }* P* ?# `6 U% Y- m
& B) e1 }+ I; c- ;----------------------------------------------------------------------
9 a! R6 O" ^# _5 m8 l! ` - ;音乐播放处理. w6 p- u% U$ }" t3 g* R) y& z/ M/ Q
- Music_Play_Process' {! l3 {# B. s+ ?, r1 K" U
- JSR Music_Play_Addr! Y% F6 `) v' t3 Y3 q5 B2 V2 Z
- RTS
! U4 B$ f; f* d% N5 p! a - ; d4 t7 k- Q8 y2 D4 @/ }; Q1 v9 x( j
- ;----------------------------------------------------------------------
# j4 A8 y! H# e$ @1 k3 A+ | - ;音乐播放处理
/ b7 C; k, G! m/ r - Music_Clear_Process
; |) s: R- Y" F$ u - .IF Music_Clear_Addr) G2 E" z1 |# M8 m$ V& y k* J0 e
- JSR Music_Clear_Addr/ g! C+ M4 a6 e& t1 g4 c
- RTS' L5 \7 _" L2 x3 M" ^
- .ELSE, L# B2 N: {; D' J5 L0 {
- LDA #$1F
3 s& D1 O- e4 a+ c [ - STA $4015
2 f! z* _8 @9 \" h. H - LDA #$00
6 Q, B9 W, }$ C$ D, o9 Y - STA $4010
$ T* _0 I* m! H i$ e! w - LDX #$00. g2 D$ I$ y/ R, u! d
- LDA #$00
% b* T# L# K) ?0 x+ A - ' r3 o- W# j. G9 _6 I) R
- .Music_Clear_Zreo_Page_0
; X8 ]' }# O( M+ j/ m9 Y - STA $00,X, B" M' I4 j- K* g2 e
- INX
! h" X9 W6 z$ N! o) V* j - CPX #Use_Zero_Page_Begin$ i9 |4 H, ]0 P3 F* Q+ o
- BCC .Music_Clear_Zreo_Page_0
* B' E! \+ ]$ d" n7 j8 E8 _+ t -
+ Q: C5 d' a5 H8 l8 i8 H - LDX #Use_Zero_Page_Begin + Use_Zero_Page_Size
`1 K1 g7 \0 ^! W1 [) N2 `, f5 V - .Music_Clear_Zreo_Page_1
! t$ Q+ P! w% O8 J+ i7 `' a - STA $00,X+ l! g( l2 B7 |; M# C# o
- INX
4 A5 I( y" j$ E$ ?( J7 E2 w - BNE .Music_Clear_Zreo_Page_11 y4 d# h4 q, M. c. \, ^, k# X
-
' k6 x* S0 P. j* `1 Q4 I/ L - Music_Clear_Process_1
) \3 N6 [; P: @$ ]* Y - STA $0600,X
. i. @# h$ W1 ] - STA $0700,X
% W. Z/ q q1 k* u - INX% E, t2 X U5 w& y
- BNE Music_Clear_Process_1
4 c+ V6 S. Y3 Q6 q+ i7 C+ C - LDA #$105 N; m: b, e8 ~* j) i( x7 D) H
- STA $4000
; f8 [& N5 I" `( D" X/ J, I - STA $4004
O! W4 i' \- [/ W* C5 L7 h0 P) b - STA $400C
. t- m6 `/ ]6 ^0 _4 Y/ a4 Z - LDA #$00: y6 \' ~* l. \( G
- STA $4008
8 {# c7 s% \/ O( J - LDA #$0F
" D; y( @& d8 a6 z/ l - STA $4015- K; p& Z) O% }& S. z/ E1 s
- .ENDIF
; P9 \# X' f/ t9 _1 o! C# c - + D5 N: _: j' p p S; K$ K7 E
- RTS
, J, n" `) |" D7 z, b6 X8 ~
! D" G/ H+ P$ l+ `8 r: I9 { x- ;======================================================================
' d5 f, _: g c" _9 ]" }' l - ;重启处理
0 O; j& p. w( d$ k - Reset_Program( ^/ n O: k m& L3 ^
- SEI
/ x8 Q6 F$ G" @4 V - CLD
. X, O" u" i5 R5 k) x- K+ j# N, Y% u - LDA #$00/ t1 o+ w- n+ A% X+ t( @
- STA PPU_CTRL
7 J1 W5 `3 W! n - STA PPU_MASK
1 X! d$ M4 L7 m* M - STA JOY2_FRAME
% x2 W! X7 q3 d% S. L1 U: z - STA APU_STATUS% B' ^ Z, ~: k5 A
-
6 d3 c$ l" c, G u" N - ;等待屏幕准备完毕
+ t" X: }6 h/ O V. k4 K; s/ H/ q - LDX #$02: j! v7 }4 y% h
- .Wait_For_Screen_Ready! \: C8 c$ {% d9 b! s
- LDA PPU_STATUS8 W( b3 @/ y% D, {
- BPL .Wait_For_Screen_Ready( s5 K: a4 e% V
- DEX
G" |3 Z8 ]: @0 o0 }+ u, Q1 O2 j - BNE .Wait_For_Screen_Ready
! I3 f% a( p0 l - - M+ u2 X1 \1 n* o
- ;清空调色板( H$ D; m# J, h) y8 \
- Palette_Clear
C- ?. V6 Q7 P* v5 G - LDA #$3F6 B, H) @0 F+ g9 B" G4 X8 m
- STA PPU_ADDRESS
7 H' _6 N, d3 x/ @: p - LDA #$00
' E1 c4 [) j- }, M1 z8 ?1 k - STA PPU_ADDRESS4 h: n+ ]/ @/ z- w- m
- LDX #$20. B8 ?! q% H( V+ T3 X9 n
- LDA #$0F
* R, |+ S1 ^& j) L+ R s8 z; q! O8 _ - .Write_Data
3 X9 ]7 N6 w* e& u0 o1 M - STA PPU_DATA
7 q* S6 m6 L5 T9 E/ i( l9 `% r - DEX
# i( |' i a& ]: X - BNE .Write_Data
* A. R) \0 e4 n8 E. H) b6 k* Y - + f& l9 q& Q, \3 b
- ;清除声音 $4000-4013
% x" Z. Y& M1 L3 \3 a& L - LDY #$148 X0 X4 y4 D( a: l( i
- LDX #$00' m* s- k/ N4 N/ t$ x
- .Sound_Clear0 p+ N% b: n5 f
- STA $4000,X
$ X3 y3 o; _2 K - INX
t/ ?6 s4 Y, \" z4 y a2 I - DEY1 t9 x) Q' c$ R
- BNE .Sound_Clear8 }. j1 f+ E$ }1 Z7 _* i+ V
- 1 c2 T9 y2 B0 P- @0 p0 g
- ;清除 RAM $0000-07FF
# N* B! O) U6 |7 e - LDA #$00( u/ K& [( t% \8 S- W* I9 G+ |* R
- STA $00
7 R6 C' g# j' n4 B& h! v - STA $01
! v: i% b# D# ^+ P: ~ - TAY
+ j2 D, x) l$ |) d0 S% ~3 ?) _6 w5 g - LDX #$080 }3 b) t5 x9 {9 A8 [
- .Memory_Clear& @% c# Y( y3 X$ O0 R/ @5 t$ ]+ r
- STA [$00],Y
2 Z7 W) X0 o8 t - INY
& D1 B! B, R2 P& L; h# X! I9 U - BNE .Memory_Clear- d' Z) q' z5 m4 a( A N
- INC $010 L5 ~! g. h2 o: K! u
- DEX* O4 m& L: z1 o& O8 ?
- BNE .Memory_Clear& N |1 p. l& g# ~. G5 X0 n
-
" r: h4 m, D5 p4 T) e$ X" N - ;精灵缓冲初始化
; t! T- B* b; a3 H# T - LDX #$00
6 ]3 a' b: V# W$ ]" w% V5 u - LDA #$F8
% t9 n5 n. ~; ~4 A( F- S7 j - .OAM_Clear
6 ?5 Y# }& ^* a, h - STA OAM_DMA_Buffer,X7 S. a% A% h/ R
- INX
/ S- ? F9 J9 \% z( U4 u - BNE .OAM_Clear
' \6 t1 L- b. W; D" u! e -
8 {/ f" n2 u& B) [9 v/ r% k - ;栈指针初始化
9 d% S$ W! o# c8 V1 F" g3 {" v7 c - LDX #$FF7 @# s" l3 x. {7 u* x* Y* d
- TXS" f0 _6 _, e$ u+ T' N1 m' S- M) z5 x; u
-
( G% X f- Q( c) a H" W - JSR Nametable_Clear;命名表清空$ a. A( y" Y) n% |3 M
- JSR Palette_Init;初始化调色板缓冲* C/ k- y6 Z. d0 ]
- JSR Static_Text_Init;初始化静态文本+ I1 i4 z' b' S& U+ G1 j
-
, F/ [7 j% ^& A9 N7 Q% p - LDA #MUSIC_ITEM_TOTAL - 1
2 W- ]( v, F% u7 F3 p - STA FC_Music_Max_Index
+ q1 @4 y6 z6 Y( d. x -
, `1 E2 S8 m% p7 M+ V0 ] - LDA #$1F2 K2 E/ A+ a' @
- STA APU_STATUS) e! J: ?. D, T$ F
- LDA #MUSIC_BGM - 1" {3 g0 v: I, E- c3 c
- STA FC_Music_Index
* o- j/ T L Y$ g% G! g) K - JSR Music_Init_Process;音乐播放( S( c' j0 G, w; L: r& w
- 0 I' C2 ?9 x# n2 `1 r6 [
- ;设置屏幕显示状态缓冲(当NMI处理时控制屏幕显示状态)& A4 _* K- u) d8 o1 o, a' b
- LDA #$1E& q8 a# y) p6 e( Q0 n
- STA FC_PPU_Mask_Buf! R: u8 f- Y0 s* {" u- O# I
- " v! g& t& k5 ^
- ;启用NMI处理& w# j( r6 M8 o& c* ~6 a* Z
- LDA #$808 _9 L7 y% S6 Q
- STA PPU_CTRL3 ?; `: S4 j |) [, t8 b" d
-
/ v @$ z$ X/ `& d# _! R - ;程序循环, 剩余工作交给 NMI 中断处理
; Y# V: b" c* ] - .Loop
6 X' @+ n$ M5 w$ Q0 ? - JMP .Loop& n! ?2 M* F5 |! S& \ ~
6 t1 F2 x: B: g/ k4 V+ |1 J- ;======================================================================! R& }- p9 \# G7 w; s) c
- ;不可屏蔽中断处理
2 ]. M& M8 c$ B4 T6 m: \0 S - Nmi_Program
( [. }/ C+ L2 k2 v" \- | - PHA* `/ b7 E& a# _) T$ } I0 g6 m( V
- TXA4 ^* _$ G1 q! k
- PHA7 V2 J, K( o( [% o9 {& \7 f) V
- TYA( V, z" Z9 P: \ X) L- i
- PHA
0 X) E, Q' c1 I. { - 4 S- @7 {+ T, E. n
- LDA PPU_STATUS;读取使得 PPU状态寄存器复位% J2 y8 D. F4 _
- 2 [5 p4 n6 r8 i- J' e8 @+ s g1 {
- JSR FC_PPU_Procrss;PPU处理
/ o+ `5 z1 j9 h# o - * P. A5 e, E8 b1 c
- ;精灵内存更新' w) X8 h& e- g& h1 b
- LDA #$00
3 ?5 I+ [+ Z' P# h - STA PPU_OAM_ADDR" R4 H: R" Y. N% K6 m% }* o0 [/ T
- LDA #OAM_DMA_Buffer / $0100
$ g( A! c# u3 ]' O* r - STA OAM_DMA
! r8 H) F( ^3 {! N& p -
1 q# t; V. b1 v* T3 x, \, q* @ - JSR FC_Gamepad_Process;手柄输入处理, J I! _9 R/ p' c0 ~4 y% Y
- JSR Music_Select_Process;音乐选曲处理 {+ `0 H- y7 |
- JSR Music_Play_Process;音乐播放处理
2 c' R+ y' h9 }' r2 r X/ H3 |. m - ( e; L# B2 [0 s* {; Z% X, O
- PLA
& i* y0 N7 h2 a6 \9 [) u2 N8 ^ - TAY+ z% e- p6 D' x, N6 h5 r; i- s
- PLA
% r/ w% Z+ \% P4 v Y. E1 J - TAX$ E/ K+ X' G1 E9 a- _
- PLA) F& O: V3 E' o- W
* m2 G7 s6 j4 F- RTI3 R" M4 J$ F+ ^9 e# U
3 r* D- M2 d3 H6 T2 ?- ;======================================================================
1 |2 E* e; d6 I# o: ^/ e - ;请求中断处理
- Q1 Z' v1 R0 h" {! I6 [# q - Irq_Program% {: h# z# F! E0 C8 t7 k
- RTI
: g# l# Q1 @3 X7 \+ \4 @, e9 g5 `
" t+ k( u, y. \- y1 b/ Q# F2 D- ;======================================================================+ |$ s$ k9 y4 A
- ;中断向量表
, l4 R. l- \4 O; g - .ORG $FFFA! \+ `+ w5 h) g$ c2 D, W! d
- .DW Nmi_Program ;NMI触发时执行9 s% d( P+ B$ n
- .DW Reset_Program ;载入ROM时最先执行0 {' Y% I8 j" d# |, b! E. V
- .DW Irq_Program ;IRQ触发时执行8 o8 B. c# |' _% O1 h
复制代码 & y( r6 O0 B9 Y x( O1 r
4 y# |" {) b3 t2 n- \6 R6 f8 t& V/ r1 Z
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