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这是个 nesasm 3.2 入土教程, 感兴趣的可以研究下/ B3 H( p4 z/ X

$ z9 u& m8 N$ M* g* b以下是主框架代码:
) ~1 w9 V! t% G4 X# ?: F+ R) O0 E- ;======================================================================
; @/ `7 O* P3 J( k; r+ P1 ~ - ;文件头3 g8 s8 n# j7 _$ Y# x: ]
- NES_16KB_PRG_SIZE = 8 ;16KB PRG大小数量% @5 J9 d m/ e
- NES_8KB_CHR_SIZE = 1 ;8KB CHR大小数量2 ^ I! O" E; |
- BANK_DATA_MASK = NES_16KB_PRG_SIZE * 2 - 1 ;bank号掩码
9 R4 C4 ]. m" u1 t" i - ;======================================================================" c' E. d ^% k$ o8 A7 ^! h7 R! y
- PRG_DATA_BANK_C000 = NES_16KB_PRG_SIZE * 2 - 2+ Q! H/ U/ G# U* m# l
- PRG_DATA_BANK_E000 = NES_16KB_PRG_SIZE * 2 - 1
* {0 T, L9 `+ _6 W+ _" ?" j - ;======================================================================) q0 k) e3 [& j* y9 B
- RESET_BANK = NES_16KB_PRG_SIZE * 2 - 1$ ?( \7 ]* Y: r, n1 }
- RESET_ADDR = $E000 ;主程序起始地址
" y+ c) M7 C4 s$ ]6 S ^/ D - ;======================================================================& l( D7 n$ w4 ?2 m' Y8 q
- .INESPRG NES_16KB_PRG_SIZE ;16KB PRG 数量, $01-$EF8(1-3832),即16-61,312 KB
5 E( V. u; N8 G- o3 e3 D. k2 ~ - .INESCHR NES_8KB_CHR_SIZE ;8KB CHR 数量,$01-$EF8(1-3832),即0-30,656 KB
, L1 B* X( t7 I1 d+ a P7 I* I( ?- o - .INESMAP 4 ;Mapper号 (0-4095)
" G1 b N7 b# S' I. Y - .INESSUBMAP 0 ;子Mapper号 (0-15)
) K# ?& P( B4 _& n% T - .INESMIR 0 ;命名表镜像 (0: 水平 1: 垂直 2: 四屏)
# |8 t) ^2 c# {9 o3 z - .INESBAT 0 ;指定是否存在电池备份 (0: 不存在 1: 存在)# A# Z) d. a% b7 E7 j
- .INESPRGRAM 0 ;指定 PRG RAM 大小 (大小 = 64字节 << 计数)( d8 a8 K: i' N2 U4 N2 |- H
- .INESPRGNVRAM 0 ;指定 PRG NVRAM 大小(大小 = 64字节 << 计数)# p3 S! n3 @9 K/ }6 s+ k7 P6 H7 M
- .INESCHRRAM 0 ;指定 CHR RAM 大小(大小 = 64字节 << 计数)5 k# J* e& S* g+ Z, S) ]! y* j
- .INESCHRNVRAM 0 ;指定 CHR NVRAM 大小(大小 = 64字节 << 计数); Q$ q3 K* L& W2 v; `+ E
- .INESTIM 0 ;指定时序 (0: NTSC, 1: PAL, 2: 多区域, 3: Dendy)
1 J7 [/ N7 W g2 Q. q - ;======================================================================: Y; \5 n! N. o' h
- .INCLUDE "fc_demo_config.asm" ;全局配置
! B, @0 f3 @" f8 v - .INCLUDE "fc_demo_constant.asm" ;NES常量
# A0 H8 C, p) k1 r' P* i9 `; D - ;======================================================================6 J6 p/ u# o7 O Z5 a
- ;音乐配置& a0 Q2 I% g# V
- .IF 0 = MUSIC_THEME 2 }+ a+ D! ^+ H" x" L
- .INCLUDE "data/music/Gremlin 2/config.asm"
- ^2 y% ? U$ C% A: J [! M" ^ - .ENDIF; t6 o- |) t; T. g1 u* W% t& f
-
. q1 H/ @) v2 L! t( |1 }5 p - .IF 1 = MUSIC_THEME; } U4 p0 f; j% b }% V- A
- .INCLUDE "data/music/Raf World/config.asm"9 R; l A1 D, h6 k: U$ @
- .ENDIF
( i8 R+ B. O- N2 H" M - ) w6 v; M' ]% t& C- |+ r4 m
- .IF 2 = MUSIC_THEME
9 ^9 q1 U& x( ~- P - .INCLUDE "data/music/Ninja Gaiden 3/config.asm") J T( _4 W, a6 Q
- .ENDIF
! X9 u% _- N; X; W3 D
) G9 v) v! g2 l8 @- ;======================================================================5 S$ r& t# u. K" d, ~9 m
- ;引用CHR图像数据, n& K8 r9 z/ o3 ~& u/ t0 k. G
- .BANK NES_16KB_PRG_SIZE * 2
7 @" c7 \7 w+ {3 C - .ORG $0000
, Y! K* h( M, P4 o8 Q, O! \ - .INCBIN "data/bkg.chr"" m( X# W& j! V
- .INCBIN "data/sp.chr"
/ j" A, h$ O4 [ - 1 z1 w. ]/ D& ^# E& A/ z: [
- ;======================================================================
+ W2 y, F( q: e* R9 k ? - .BANK PRG_DATA_BANK_E000 & BANK_DATA_MASK;设置程序所在Bank
% x1 y$ T# E* G& N: { - .ORG RESET_ADDR0 W, S6 |. U/ P$ S' w8 r Y( _
- ;======================================================================
: `+ z1 f2 W+ ^5 ^7 M( I' D% C - ;引用其他源文件
]/ [& F9 ^& K1 K3 S; s - .INCLUDE "fc_demo_ppu.asm" ;PPU处理) h W1 }2 _! L: K6 v$ B- C* x
- .INCLUDE "fc_demo_joysitck.asm" ;手柄处理
9 h- |) _6 z7 C4 ` - .INCLUDE "fc_demo_static_text.asm" ;静态文本处理. A% K" O# Z$ E! r4 C
- ;======================================================================0 r- D! [( R$ c6 E. E. \1 i
- : L* \% F* G5 Q1 j& G
- ;======================================================================4 H: G1 M1 P; m5 S4 M
- ;等待VBlank到来
8 c/ E0 c6 d. S- p; T - Wait_For_VBlank! C0 h3 B; }# P% R! P, c2 a
- LDA PPU_STATUS" r. Y0 | P' w% k0 N9 D; L
- BPL Wait_For_VBlank$ V- p! d$ u3 l4 T( K7 o1 H& Q( j
- RTS
' h3 g( M9 `$ R: M5 V; A2 q' V - % C2 P8 `9 ^4 q+ i. B
- ;======================================================================
( B/ x$ m- O) i/ V4 O6 o1 ^ - ;调色板初始化
5 {) @3 a! e# r8 y, V- g' _& \, I - Palette_Init$ n6 [' y3 w: R! ]$ I
- LDA #$3F
6 |% y {4 z. S" J- j - STA PPU_ADDRESS
3 z' r8 G9 Z2 T) u# _ - LDA #$00
1 ?' F T5 o' j6 K3 [ - STA PPU_ADDRESS
6 `+ u$ h' ?( ?+ o% z - LDX #$00
2 }. `" k9 z0 d: U1 z! P - LDY #$20# e e$ @( L" S! F
- .Write_Data( j4 G4 K+ P! ~& K
- LDA Palette_Data,X
1 }' ~- r1 u0 T1 F/ Z - STA FC_PPU_Pal_Addr,X* l* X0 p5 I# _ E6 o" o
- INX
. D& C- [2 J7 y( |' g* F - DEY$ k: E4 g' {5 A L
- BNE .Write_Data
- ]$ L5 z7 Y1 p. [1 M" h4 Q1 L - .End* V) n! z$ n! W
- RTS
) \, v6 q3 J. r6 \; E - ( Z* `! j1 I Z0 R6 {) z! K0 R
- ;----------------------------------------
1 B! G! X/ h; Z2 I, k2 C7 r& N - ;调色板数据
1 q$ }1 ~& y# d- g - Palette_Data- s8 M, f I: ~2 `
- .HEX 0F 20 32 02 0F 20 32 0F 0F 20 32 26 0F 1B 0F 1B
6 J( a* J6 }+ H: v" r0 t3 k - .HEX 0F 21 27 22 0F 24 24 24 0F 21 21 21 0F 22 22 228 s& r0 J4 U6 F% K+ k, F5 v
-
a" P* r6 t( h1 d/ a- I7 u3 l# z& ` - ;======================================================================
" q, y% Y/ ]: U8 Y" N# p- j - ;命名表清空- ]+ r9 I* B( p- e0 _. S
- Nametable_Clear% Z, u0 F8 l# W6 p
- LDA #$20
0 d& k& O+ `6 N5 o - STA PPU_ADDRESS
' M: g3 }( n \8 _* r b, X& w) r - LDA #$00! m% W0 o" y7 Z; q! o8 B
- STA PPU_ADDRESS
0 ~5 a. J2 o# x$ Q; S7 e; u - LDA #$00
8 l% \' w# q7 R8 I' {$ J6 z/ l - LDX #$00- \! z3 i$ ^$ |1 x0 ~8 {
- LDY #$08' A0 h$ c0 P1 G: L4 \
- .Write_Data6 h$ @6 k4 I# K7 B. w6 Z
- STA PPU_DATA' m5 y% s# A: H# s& h
- INX
3 u! Y z' D, f. g6 D Q - BNE .Write_Data; X: p* v8 F7 O! }( Z9 L# Z1 R
- DEY7 r8 K- ]' |1 j7 L8 H; k- c! W, y
- BNE .Write_Data
( n. y0 ]# I; h* X - .End
4 u5 W' g# M7 G - RTS' d" S2 d! b. ?# _- p
- 5 Y o/ h* n6 k( K- |: a, C* t
- ;======================================================================* Z4 h, j* Q+ g
- ;音乐曲目切换6 L& M% X0 p/ Q- D" x8 n
- Music_Select_Process
1 I$ h+ R4 G! f0 k& o/ a9 s. I8 Y; R - 1 k$ k" `5 L1 T( Z
- .Pre_Music;上一曲
3 r6 r# U0 ^# x8 b& J* f6 y - LDA FC_Gamepad_Once
0 [* y* }" d! X - CMP #JOY_KEY_LEFT
, d) ^# t* \2 ?: W - BNE .Next_Music: k8 F! Y8 w5 ]# R/ w0 F! y
- JSR Music_Play_Pre
- [: O& e+ C$ c( k& h# X9 K - .Next_Music;下一曲
" ~% p0 F$ v* M- C - LDA FC_Gamepad_Once
4 X. a% Q; e: r, G% v+ | - CMP #JOY_KEY_RIGHT1 m; `( d3 K d: V: i' t4 k
- BNE .Next_10_Music
3 ^5 O0 M _' T# H - JSR Music_Play_Next+ }8 {' k2 ?1 \2 B3 A
- .Next_10_Music;上10曲, H: C* }$ v( e* V6 I$ q
- LDA FC_Gamepad_Once0 Z1 Y: B7 O# `! d' S! F
- CMP #JOY_KEY_UP
4 Q" D9 ?& o' t" b& Z9 J) | - BNE .Pre_10_Music8 A* h0 A4 P& A$ F `8 ?
- JSR Music_Play_Next_10
7 D$ y6 N# q4 A- s8 `( s4 o, m - .Pre_10_Music;下10曲* D* ^" l' H3 y! e2 Z; z4 @
- LDA FC_Gamepad_Once7 g2 ~" I' c" O6 V- i) X2 {
- CMP #JOY_KEY_DOWN
5 z5 W% q: S- O9 D4 I1 V - BNE .Reset
$ R5 C+ p/ l, [5 g+ n - JSR Music_Play_Pre_10+ U4 g9 x ?4 ?" d6 r5 a9 t
- .Reset;重播当前曲目
% E# P, B( X7 R( T6 k - LDA FC_Gamepad_Once
& |2 r8 b8 H' A" Y. z3 q4 g0 D - CMP #JOY_KEY_START
- t# l5 ~* ]- n8 P: v/ r/ v0 K7 b- u - BNE .End
$ E% B# j' [" R1 G) J - LDA FC_Music_Index
" X% E, \8 Y' A3 ^; o2 ? - JSR Music_Init_Process+ K, X; S R6 I- f+ z. I6 c3 ?/ U% C1 W
- .End
4 H W% a$ p7 w0 t3 I% U/ Y7 b - RTS, N' ~' g# S# l2 H) k/ R* R
" U( n; h+ v" o& J3 E- ;----------------------------------------------------------------------# P, ? r5 p- U! |9 `* d' E, N
- ;播放上一曲
; {# s! N! Z/ [2 C3 b6 ]% A& a - Music_Play_Pre
# O' I4 D5 S1 V* k) \' v - LDA FC_Music_Index# K1 V2 N+ {2 n& H, N9 G0 i1 `
- BEQ .End" [8 x @- D5 V
- DEC FC_Music_Index
+ ]" ?- l' x1 X* K Y- E4 r8 T+ o - LDA FC_Music_Index) m7 [6 ^8 |. R$ |
- JSR Music_Init_Process- m+ h, C/ ?+ Y+ c) d8 @
- .End
, K/ _* R. I6 F" @5 ^9 l9 w - RTS
( p: Q0 X* v* `+ u' M- l! n - ;----------------------------------------------------------------------
/ ?& o# u/ |) W% L - ;播放下一曲
) y' w: G$ ?$ K3 Z, B3 n5 M/ C7 @ - Music_Play_Next
" S. c: H& p0 @# n# X - LDA FC_Music_Index
5 g7 ~' t. x, S$ H- R: R) A - CMP FC_Music_Max_Index
/ w* Q$ }% L9 n2 v - BCS .End
+ i) t" n9 L8 Q* D5 X- O - INC FC_Music_Index
8 j9 [' M# s( p$ Y n - LDA FC_Music_Index
- m+ M; t% K% g - JSR Music_Init_Process
4 b: R c$ C& a u# p, s3 w! [ - .End2 s( d- {; h! r7 ]8 p4 o
- RTS/ {" g+ X2 B+ ^3 Y6 P' Q6 D" [
' g. ]4 ?$ _: v# s) d- ;----------------------------------------------------------------------
, T& a+ S8 n3 Z - ;播放上10曲; u0 C; g8 ?' ~6 J
- Music_Play_Pre_107 u1 u2 r+ [. m4 _: L4 N, V
- LDA FC_Music_Index
- v1 G; s( m- H/ ^" p7 @ - BEQ .End
% [( t2 x* L5 m - SEC9 N7 ^- l3 s2 _. W+ n
- SBC #10" b# S8 }' G6 U7 P; x
- BCS .Pre_109 I" w( V% Q2 a* L: }0 I6 \) G( Y, @
- LDA #$005 V; V0 v' ^- S3 u" l+ c
- .Pre_10
1 c$ w: r2 X4 K6 u9 a/ R - STA FC_Music_Index0 z' q# \& X' b; N
- JSR Music_Init_Process0 X8 E g# Q; b% {8 N% |3 X8 i
- .End
" `6 E" A) Y; F( \ - RTS
" n" n+ o: w& ^) ~9 l/ m6 m - ;----------------------------------------------------------------------+ q$ C7 {. Y" h3 x$ M* ^
- ;播放下10曲0 e G5 _- F$ V2 P8 k+ h
- Music_Play_Next_10
7 \# S! k+ u# W% q& Y - LDA FC_Music_Index: `3 h+ _: g/ V: g" {: \7 y
- CMP FC_Music_Max_Index
3 ^9 c! }* g! G! f - BCS .End t2 b. M& [0 a0 y+ T4 A
- CLC! j. H6 A2 I# p( i7 W
- ADC #107 A# V, w& b. N* v
- CMP FC_Music_Max_Index1 h! w! E7 q! S2 L6 G2 a( E; f5 p" V
- BCC .Next_107 _8 F6 X/ _3 P5 f: M4 `/ s
- LDA FC_Music_Max_Index9 U9 [+ ~* _4 Z5 q. z/ g
- .Next_10
( f) K, n' m# r" n8 O7 k - STA FC_Music_Index
( Q' I5 @( @# l0 I' d. k/ B1 E - JSR Music_Init_Process
' D3 E$ j% e4 O6 g6 a. C - .End
+ g+ [: f. X+ y. i8 P+ X - RTS
" K' n/ I E3 u2 T2 p$ K6 a
. ^+ [# U7 t1 D- ;----------------------------------------------------------------------0 [; h* X( b5 u/ t" a+ U1 i" `' J
- ;8位十六进制转3位十进制制1 u- o6 P. c/ f" R" t$ {! Q
- Hex8ToDec8 b5 n. B# V. d
- STA FC_Dec_Data_1: T* c% ~6 y y# y5 t1 c
- LDA #$00
, p( n% \+ b) o3 [7 Z - STA FC_Dec_Data_100+ C$ G' U. Q6 |( H6 Z2 u/ }
- STA FC_Dec_Data_10
+ H# t# S: G" y/ p. }) T, y# C! t2 X. _ - LDA FC_Dec_Data_1
( y% Q0 f; z+ n1 c8 S - .Convert_100/ M) o# r# [6 S! s) y2 T7 V
- CMP #100
% Z2 M( v k2 h9 b& S( x t - BCC .Convert_10
g: [5 ^2 y6 d; ~/ J5 c5 o7 Y$ L - SEC2 r2 z( X" G r
- SBC #100
1 ^& I7 K' k0 ^+ R. m; |! H - INC FC_Dec_Data_1008 ~! J& x/ ~: ?
- BNE .Convert_100
4 E: |5 O+ ?" S! b+ ^ - .Convert_10
% L5 l' U1 Y% D, o, O$ f - CMP #10
. { s: h! R- d3 Z9 P - BCC .End
% |4 g0 Q' k' b5 U+ J- }( D - SEC C6 B+ K- G& E- {3 ?8 j' ^" N
- SBC #10
8 m+ [ \ a" s1 P( Z$ h - INC FC_Dec_Data_10; E h/ P* O; V. Y" E! _ f
- BNE .Convert_108 o5 D' m% {" X) W/ S# c1 d: M
- .End4 Q6 i6 W8 y0 Y+ k+ I5 ^
- STA FC_Dec_Data_1
2 h3 A4 D9 N; P* b' x: L" ^ - RTS
. A$ ?6 s! j/ w Y
& O* l& {. d8 t# F5 U) ^4 P) C7 {- ;----------------------------------------------------------------------5 a; W7 n, |$ @( i' C
- ;显示曲目信息, ?. R" |* f4 K; }" g0 S) m
- Music_Info_Display
, I! D! p" z& g - LDX FC_PPU_Buf_Count M0 M% \! H7 O9 T- [( Q. @! W
- LDA #PPU_WRITE_MODE_CNT_LINE
/ s1 c: d6 F# ^; S - STA Use_PPU_Buffer,X
$ b7 G- ]+ m" x1 ? - INX
0 m8 s5 H$ i2 C/ X - ! h, G" @' a. \$ @ Y
- LDA #>MUSIC_INFO_POS! m; G, O, t3 f
- STA Use_PPU_Buffer,X
3 M( K9 ?& y, y2 J! \3 r+ @ - INX
8 @5 j$ o. T# k' E" @ - ) r2 w( E6 l9 e% \: K9 u9 Q
- ;居中8 e. r( K& @; P
- LDA #<(MUSIC_INFO_POS & $E0) + (32 - 5)/2
% n& C0 }' S2 q n, v, Y# V1 h - STA Use_PPU_Buffer,X
P$ y2 Y: k" D6 C) R d2 f8 b - INX! [6 f* A4 x+ n4 H
-
( j* |. J4 c+ D8 C - LDA #$05
" o9 f# w4 ]/ I9 E+ j7 n) H - STA Use_PPU_Buffer,X
@$ Q* k2 Z4 D. c% b - INX% D! `( `' o+ C( [: g3 v( h$ y3 H
- 1 a2 F6 F4 |- O( F0 y3 P) Q
- LDA FC_Music_Index- z" R& g9 N: _( g& T' d
- CLC2 x; i7 i2 @! h# N& P' k, u% P9 y
- ADC #$01
0 w/ q% V$ `* H4 T1 @. Y - JSR Hex8ToDec% [! h) e. T4 s2 K- z
-
, b; ~' M: _; r$ c - LDA FC_Dec_Data_10- g2 Z4 h3 o, v) |; r+ m& q
- CLC
# M/ J! o2 w0 h - ADC #'0'0 p$ v1 ]; {+ E2 J9 ]
- STA Use_PPU_Buffer,X
# o# d2 e k( u9 p' I9 K - INX, a* U* d0 ?) W/ v
- ( M7 I- x3 x. d
- LDA FC_Dec_Data_1: @. X1 [; F# N" G1 ~- A8 M
- CLC
4 Q! C& q% E) V$ D) t A - ADC #'0'7 B5 ]- r$ u0 E1 Z
- STA Use_PPU_Buffer,X
u3 E% p! \# ^9 i1 a* g - INX
% c# q/ `2 _# r( Y& g -
* P J- p% O, o5 u - LDA #'/'
4 p4 k- ?3 T' s9 K ]. Q - STA Use_PPU_Buffer,X1 r7 |4 h0 p8 h5 ?" M. \* C; d
- INX
6 j/ s" w0 f6 R1 A -
! L: A: J6 l& K4 Q - LDA FC_Music_Max_Index
$ x- S( ^3 e5 h, w - CLC9 x6 [, G! i. `, f# T
- ADC #$013 Q5 r5 x" j3 X
- JSR Hex8ToDec i% q" ]& J. j
-
+ I) h* M7 k: Y - LDA FC_Dec_Data_105 S/ h, B8 I& y: a+ [+ ^
- CLC
, z5 S7 N# m9 @ - ADC #'0'
8 ^: J, q$ x0 I$ T' A" Z - STA Use_PPU_Buffer,X8 j3 W2 U8 `- B; a0 U' P% b
- INX( t* z5 `- {/ s0 d8 t, _' u
- - b! W2 f; ]# L% S4 {+ J" z
- LDA FC_Dec_Data_1
2 n6 _9 k2 P# P) h) H" L) {3 _1 M - CLC0 J! S [# v, [* ]+ d6 M6 ?# B
- ADC #'0'
) C$ |4 l' R1 U2 N - STA Use_PPU_Buffer,X
! ^# g0 V- @# I0 a: j4 k - INX
( ?1 N ^! f5 T( C -
* d8 T3 |% ]5 Q - .End; ~8 |3 W3 T( o! ?
- STX FC_PPU_Buf_Count
$ X8 [4 D0 Q7 i3 ^1 x- w - RTS
# _8 f k" V1 Z! T c! e5 r
, ?; A0 d* y9 ?3 _# \0 X o- ;----------------------------------------------------------------------' f8 N4 u/ h% u0 G1 M/ P! t6 n
- ;音乐曲目初始化处理1 U( @6 p. O8 y4 n0 J; Y' Y
- Music_Init_Process
% j. f( `, ?0 e7 b7 ^ - PHA) ]/ ]7 H1 r1 g, O" u
- JSR Music_Clear_Process
1 x1 L+ Z. u- L2 t! I - LDA #$1F' J2 K3 f/ I6 H# e- p
- STA $4015, m6 A9 D" I9 _: ?& u/ L) [6 ?
- PLA
3 c5 u; T0 i, k" Y5 Y - JSR Music_Init_Addr" ~+ p; F) t+ |7 p" T
- JSR Music_Info_Display2 y% H1 j- d4 V7 I
- RTS
7 [+ E9 Y# e3 x5 x/ n) ]- i - " V$ O2 Z2 c/ U7 \2 r9 p
- ;----------------------------------------------------------------------; v% e2 _+ \7 F W9 x: a: w4 M
- ;音乐播放处理. D0 ^: @/ d- k2 I0 r
- Music_Play_Process
1 B& g" W- I8 O6 l# R - JSR Music_Play_Addr m/ o$ J/ n% B6 W' O
- RTS
, E% A; X; p2 M3 W* A
9 q7 ~, `3 h- B' x- ;----------------------------------------------------------------------
2 V3 |. |" x7 F t- t - ;音乐播放处理. Y4 h" t! d1 v. P1 s. S/ a
- Music_Clear_Process- C9 Q# T+ o7 Y3 q
- .IF Music_Clear_Addr4 ?9 x( n' g3 ?' ?& N T' F
- JSR Music_Clear_Addr% V& b8 N6 L! w |
- RTS, @& L$ U* `9 S$ V! m8 q/ W
- .ELSE
! ?# O+ \- e8 ~0 m% F7 V, c! S - LDA #$1F
$ v/ q) x2 \9 |2 E! m* L; z - STA $4015
" }9 H$ z# C. i. G - LDA #$00/ [6 ?' N' a5 V, Y
- STA $4010! v: a) n* @- t* g$ A$ `
- LDX #$007 @9 g1 c8 E8 i) I2 |) C+ B0 d% ]
- LDA #$00 x( ~- c! U& a" q
- : Q, Q' a+ x6 Z' a& m
- .Music_Clear_Zreo_Page_03 Y1 s: j7 _7 }0 n" W3 M$ v
- STA $00,X
4 F; y% f8 h# T5 N3 C - INX/ f7 ~: g# w# ]* ^
- CPX #Use_Zero_Page_Begin# i4 |7 S; q$ ~2 N$ [6 U
- BCC .Music_Clear_Zreo_Page_0
& i B: M( T/ U4 G% e -
6 t8 ?* j0 U- Q7 N! K - LDX #Use_Zero_Page_Begin + Use_Zero_Page_Size3 j8 g4 Y% x) t l3 A8 ]
- .Music_Clear_Zreo_Page_11 L2 i6 |5 o6 C; n Y
- STA $00,X! V+ M& ]4 R- F& c s
- INX6 D0 x" {# n8 D9 e2 y+ @! }
- BNE .Music_Clear_Zreo_Page_1! O( D7 z- [% l9 h. `& N1 Z/ ^: w& i
- + s% Q8 ~, K* w1 b4 P: w
- Music_Clear_Process_1! [. Z8 O0 R3 ?
- STA $0600,X
' c( a/ l1 r; V* e J1 c) @ - STA $0700,X
! R9 A7 B' e" ]0 [6 A: l - INX9 j: ^( X' N* G7 L7 U* R" L
- BNE Music_Clear_Process_1
6 d( z2 j6 t- h; Q+ L - LDA #$10
0 C' u, q3 _0 T. K! x ]+ q" _ - STA $4000: h# Y7 p4 `$ J1 g+ F
- STA $4004" d. k: `2 l- O, X5 X6 y
- STA $400C
) T: ~. `, }2 q( W& n3 S( G - LDA #$00
: K8 ?6 I: B+ B& Z) _ - STA $4008
/ T" ?( |+ t1 v K5 [ - LDA #$0F- ~' M& \( j) D7 ]8 f
- STA $4015
7 I: k6 y/ E+ I/ v% b @ - .ENDIF) y5 V5 l" Q9 j7 K& P) c$ u
- 2 V0 P( F" h/ i- X1 [7 C, l' ~& ^- a
- RTS* n4 |+ b' y3 z6 H
- + O8 o4 s- y, R
- ;======================================================================, f S; Z" G9 p& v
- ;重启处理
8 [+ ]* d6 w0 B8 s! g - Reset_Program' o- H! I5 [* u. [0 N/ ^- H2 k
- SEI
g8 F, A* m8 `! z! e - CLD7 ?; @7 H+ m8 b% `% `
- LDA #$007 j' W4 Z, z! S" h, O! a/ F
- STA PPU_CTRL4 j) D7 ]2 i' V* u2 y4 r$ d( n, [
- STA PPU_MASK
# Y, d: D$ X. _ - STA JOY2_FRAME6 ~: Y: x6 n) M& G" L, u
- STA APU_STATUS
6 q& T* K( h4 l5 Z -
0 y+ [6 X' y2 y4 S3 W( n- | - ;等待屏幕准备完毕
- _" q4 }1 | b - LDX #$02
3 C3 H' I# q4 X, _* Y - .Wait_For_Screen_Ready
! A1 H$ {$ Q% h - LDA PPU_STATUS
& Z" i# j( A9 h1 N. I7 @ - BPL .Wait_For_Screen_Ready0 v" U9 S' ^" f) D" D
- DEX3 E5 Z1 p2 R' Y9 L
- BNE .Wait_For_Screen_Ready" j* r% u+ d( B; k' g2 d2 d
- 6 w: i- S" y1 V
- ;清空调色板
' x' @4 x* b( L C4 G - Palette_Clear
. z Q* b( L9 k8 _6 [# C. ~& Z+ } - LDA #$3F% }( _# {; A) l! U% U( @
- STA PPU_ADDRESS0 c, m- O( ?# {; H3 z- q
- LDA #$00
9 p0 F0 K9 L+ ?: P/ w/ p - STA PPU_ADDRESS# |3 a. r# Q7 i! H/ D5 k
- LDX #$20
) G/ R) B1 a( M( X7 y0 |, h9 j - LDA #$0F
, X2 Y2 I3 ]0 m4 ^! H* u4 I6 J! b - .Write_Data* Q i/ V- j) C
- STA PPU_DATA( x9 C; C8 p6 d3 E
- DEX' K! A3 k$ M' K% M& R6 F2 m3 D
- BNE .Write_Data
9 g$ h$ z5 a' I4 b" l! P2 y: d/ G: ] - % C& j- {+ I4 E3 Y
- ;清除声音 $4000-40137 q2 |( y, ], a' B* U H( U) ?5 R
- LDY #$14
8 B: _0 ]" e* F. g V - LDX #$00# ?4 ~! m Y3 Z" S- q
- .Sound_Clear# m. t8 L. a* `0 N- k- w2 Y
- STA $4000,X
6 L5 m- m9 G8 @" L - INX* u' h2 X# p G$ O4 p/ D0 m
- DEY
. ]3 o, m( I# z u4 h! q - BNE .Sound_Clear$ P( R" c9 c3 I* o
- 6 o' C! P; R2 t$ u; O
- ;清除 RAM $0000-07FF
1 D9 `" n/ e. ]* w% ] r3 s - LDA #$002 B" e& c4 z4 L1 o! A/ l/ s
- STA $00' [0 U" m. G- k% E7 ]' f" K
- STA $01
( D8 n4 v" t2 J - TAY
0 \% X8 j/ H' [& V6 N k - LDX #$08* Z# J9 q3 J- h; _$ p! n6 V2 P
- .Memory_Clear% J* s9 P" M( w- f; R& U
- STA [$00],Y6 Y5 o7 P: m" _- v
- INY
1 X* j+ W1 }; j& o - BNE .Memory_Clear, h2 H! J3 |5 B$ P
- INC $01
: t+ \$ x' p7 h9 h" K - DEX
3 K2 v% @; |4 }0 J - BNE .Memory_Clear
9 _. v2 {+ G3 K' ?4 s -
T6 d' [& M+ i h1 D: B - ;精灵缓冲初始化
1 n+ N+ G/ [; N0 i0 Y7 \3 o - LDX #$00
- h- k' X% I& [/ m+ I* H - LDA #$F8
) P7 R, M1 P6 p$ v1 M - .OAM_Clear% N, A( r0 }. ^; {: E* a
- STA OAM_DMA_Buffer,X
# ^5 v# E5 U* d' G - INX
& d% B0 N% o* p: B! `9 ]% j# l7 Q - BNE .OAM_Clear& R! X6 A7 }- `- ]
-
, e. G. z1 H9 r - ;栈指针初始化
; p+ v6 g5 Z( D# S5 J7 S - LDX #$FF$ s ?9 S* {; w6 ]3 W7 l
- TXS4 _$ S0 c% n: ?' \6 U; k! r5 k
-
3 O: {0 Z. q/ x n6 U. G3 | - JSR Nametable_Clear;命名表清空 C. D7 ~: y5 K# H
- JSR Palette_Init;初始化调色板缓冲
3 U' o) K" s. e - JSR Static_Text_Init;初始化静态文本; i) d p9 D& n5 Z8 h
-
, L" W' }7 \0 r+ U8 P$ R - LDA #MUSIC_ITEM_TOTAL - 1+ i9 ~% z. \9 ~& e# o2 Z
- STA FC_Music_Max_Index; c& c* [1 o2 l0 ?7 Q$ d; a# f
-
r' Q4 \8 B; @1 f - LDA #$1F; ~# h$ y- T3 Z& e) u% \) }' A" g
- STA APU_STATUS
5 V I' ^, S: f G - LDA #MUSIC_BGM - 1
4 Z4 y, y% z! f; j, R- V - STA FC_Music_Index
* F) M9 o8 c+ n - JSR Music_Init_Process;音乐播放
0 i- ]$ r0 ?5 G6 y1 u5 F - `' E. ~/ J1 o# e) l
- ;设置屏幕显示状态缓冲(当NMI处理时控制屏幕显示状态)
! f& W+ m$ N( `' p. H4 k! \7 ~ - LDA #$1E- c. _5 ^1 L! H( R
- STA FC_PPU_Mask_Buf
' C4 _$ v4 h+ b$ N4 T9 s3 X -
4 T% @. E; P7 y6 s9 @5 z: e - ;启用NMI处理! Q( R: c0 v, b- Z4 G% J5 ~1 E/ b
- LDA #$806 j r: ?7 W5 S6 l& _
- STA PPU_CTRL( I8 t \4 C1 f/ _. z+ y1 C
- 6 ~) Q r+ l2 G) K8 y
- ;程序循环, 剩余工作交给 NMI 中断处理
) t& {$ M% n" |8 C - .Loop; Y2 N" i8 Q# ?' f6 c6 ~) @3 p5 M
- JMP .Loop6 G2 f) n, z; i9 ?# N6 i
- ' I C1 b2 [$ ]3 z# \. k
- ;======================================================================' D5 U( t! H: P; C# P9 p
- ;不可屏蔽中断处理# I }& i& M# Y
- Nmi_Program3 l8 J! x9 s2 M: T; i6 Z
- PHA
2 D9 E! f( G) P9 b J$ L' m - TXA
; x# v' ^* G# N - PHA: z3 e& V( J/ o$ D/ F
- TYA1 y& @$ x% q% V H
- PHA8 z7 v l9 V" G" u
- " j% ^$ g% x9 r8 ~" z0 ^+ X u
- LDA PPU_STATUS;读取使得 PPU状态寄存器复位
$ N! v% ]# ]5 ?1 E8 D% N# J - 1 Y" o. _1 i" q( E* c- c
- JSR FC_PPU_Procrss;PPU处理% q& ^! d2 o, X; z
-
) r: V* T" Q1 [/ S4 g- ^& }& n - ;精灵内存更新, N7 w5 I# G" v. I
- LDA #$00
8 H: X9 J5 g7 p& ?" S( U - STA PPU_OAM_ADDR* J) r$ D1 X1 V
- LDA #OAM_DMA_Buffer / $0100
) @+ s5 ]% u: W9 ?, w6 k2 I- [ - STA OAM_DMA
9 O$ V! e# h' {) N5 z0 y3 } - ! @) [! `9 ?- o5 k* V F8 G
- JSR FC_Gamepad_Process;手柄输入处理+ m/ H, e1 q( M) M/ E
- JSR Music_Select_Process;音乐选曲处理! M; q, J' l+ `2 P# ]
- JSR Music_Play_Process;音乐播放处理
* }0 }) J* `$ y3 d7 g! x - 0 r8 s" U! v, w
- PLA
5 d; H; t/ e" G- F' ?8 O' r - TAY5 `; M/ [$ x9 j$ _6 v4 j4 v/ z
- PLA
4 Q5 z6 i! ~ o - TAX7 d" f6 C+ k$ x% Q0 V$ Z, `) y- B. w5 k
- PLA
6 g0 T+ Y M$ X( l& Q) Z
# f; U5 a8 z$ }/ t- RTI
* e3 d% x, P" o0 j1 N* } - 5 p0 E- `# Y2 Q' z5 y a+ J3 O2 ]
- ;======================================================================
/ S& I1 M8 z* a; K/ V - ;请求中断处理& n9 c3 h+ m% Q b# {$ E
- Irq_Program
6 T- k8 j \& y - RTI& S7 T# W# y+ Y3 x
0 t/ ~9 }5 J: y3 R3 z5 [- ;======================================================================
2 @8 o2 J8 Y" s8 I - ;中断向量表4 w( q9 V3 q: l$ p: i5 p* B
- .ORG $FFFA
% R# E/ x% k( N- V* X/ s - .DW Nmi_Program ;NMI触发时执行
1 T; f! U0 q+ ]* w - .DW Reset_Program ;载入ROM时最先执行+ S* `1 B/ h! s# P8 |
- .DW Irq_Program ;IRQ触发时执行# P( B3 A0 N- e* t' r* R
复制代码 ( d# n3 V6 T Z5 D" Z
& a5 n4 b' f1 m* K
; \6 D4 h$ q- J2 Rhttps://gitee.com/flame_cyclone/nesasm_3_2 |
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