基于STM32F1 的BASIC解码实验 1、basic程序以文件形式存储 2、程序文件存储在sd卡 3、解释结果显示在液晶屏上 6 @3 d6 g% X) I( m% b5 @$ o* v" w
主函数部分 - int main(void)1 i0 Q h. @' T$ M* Z) H1 ]% @
- {
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9 ~6 W4 W5 b. B8 r* i0 b- delay_init(72); //延时初始化
: o# Q P9 D. F" u1 _% D5 Y3 L - Init_Io();7 H& e8 j# J0 w/ P6 i, {
- GLCD_Init(); //初始化液晶* v- S( [& x& R
7 i" e2 k2 ?8 N- BACK_COLOR=0x001F;
- w4 u& D" Z: ], W! h - LCD_ShowString(30,10,"Mini STM32 SD Card TEST");
; _' D$ \! M4 y/ Z) m4 N5 L - LCD_ShowString(30,30,__DATE__); " Z4 e% I, [$ T: |* @& B
- LCD_ShowString(150,30,__TIME__);7 k7 {( I$ h; Z0 [% ]7 w+ _8 [
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- ffext_mount(0, &fs);9 }, d6 W5 I3 Y& ?& G
4 |- a! m/ [' `, S0 u3 i' l% p1 t- ffext_read("0:3.bas", wbuff2, 1024, FA_OPEN_ALWAYS | FA_READ);
! h/ ]" y- ~+ ]8 H4 q - BACK_COLOR=0x001F;
/ x+ b1 D1 @2 B/ p V3 V5 Q) h - POINT_COLOR=0xF800;% A8 X1 @0 O; y" [! `3 w4 r
- A3 \+ N4 T: [" a" ]
- basic(wbuff2);; U' Q: e9 O, s) U3 z
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- while (1)
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, I' ^& U7 q5 s1 A2 ] - }
复制代码basic关键字部分 - , R1 I( r. C A2 M9 }3 U
- struct commands /* 关键字查找表 */- @1 G. z0 N4 G1 ?: Q- n
- {
1 R$ a6 j! Y" Z- g# J - char command[20];8 M6 M8 Y- W& n' B3 y! p: @
- char tok;3 Y$ i% b, \+ f. O T
- }table[] ={ /* 命令必须输入小写 */
* Q7 k. H7 u3 P9 `$ p9 U# `8 L2 |1 c7 m - "print", PRINT,
9 x2 E6 f: B; H Y - "input", INPUT,
7 z+ X7 W+ `% @" @; { - "if", IF,
' b) z" M4 ]* \ U* m1 {/ c$ n - "then", THEN,
0 ~$ K) e3 f5 W2 o" y' y - "goto", GOTO,4 p6 O# j/ o" r/ b t$ l! M' v F
- "for", FOR," z S* x `& b: W: p
- "next", NEXT,
2 _2 U7 a0 p) M, d1 @* z. K+ n& i - "to", TO,
' H. S1 O2 m* N - "gosub", GOSUB,
5 s" }9 K: D! W( i% P5 L" ?, u - "return", RETURN,
2 I" F6 I' C: t - "end", END,; Z) p7 \: I; g# W/ D" R- J
- "", END /* 单词表的结束 */
1 ?9 ]) W3 K; G8 { - };
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执行部分
& }3 _* h8 S+ h0 R1 O- void basic(char *buf)9 Q, i4 S# U& A
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- char *p_buf;
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8 `4 d! ?" v3 G3 T1 t- /* 载入源文件 */5 P0 J% D1 m) S4 K5 T1 c
) S; h- u6 d, Y' ~3 A6 Y- p_buf=buf;
4 F! m" P3 s m( ^- t; B: B! T" u$ z - if(setjmp(e_buf)) exit(1); /* 初始化长跳缓冲区 */1 h. Y+ A$ T) J2 N+ b' z' @ _; ~! \
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- prog = p_buf;" L% n! V% [; `1 ~
- scan_labels(); /* 在程序中找到标签 */' @& W2 y5 M3 W- Y
- ftos = 0; /* 初始化FOR堆栈索引 */" P# Y3 h3 F! K8 q
- gtos = 0; /* 初始化GOSUB堆栈索引 */
9 W" l5 @, K. l3 Y3 e - do
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- token_type = get_token();
! F( e% G; e( M' C/ b1 e$ j7 o2 S - /* 检查赋值语句 */
. b5 x! g3 f+ ^0 T9 A - if(token_type==VARIABLE)5 M8 ^( k$ ^& y/ W3 |
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- putback(); /* 将变量返回到输入流 */$ b7 J A& s, b' q& Y1 [
- assignment(); /* 必须是赋值语句 */
# t0 C+ T3 Y& O4 ~ - }
. Z7 p- }# T8 Q4 U$ g: D) \4 S& y0 V - else /* 是命令 */
9 _! G* l( B7 B E1 U - switch(tok)! R0 y# I! w3 o
- {
( M0 Q7 K+ j q& g, K - case PRINT:' R7 ~4 Y( c, \1 i/ H: j
- print();
3 u. D, t, \* M* x7 I8 y - break;3 J0 J1 z0 _/ v$ u- S
- case GOTO:
8 |+ ~$ h- M* t( h( ^9 T" ]3 @7 S - exec_goto();
9 z9 }4 o- d! S - break;
9 e# y0 d$ G& U5 _3 g! h( y - case IF:
$ D4 @ d; P$ u4 O3 O( g - exec_if();5 e0 v) L& e% x: r( Y% e+ j+ c
- break;
2 r+ M' u1 n. z- E$ M+ L - case FOR:/ B* t+ f1 U4 S0 D* K* E9 H/ Z
- exec_for();5 L7 J2 w2 i# @, [. S9 i
- break;
) G2 Q/ F7 {" H* m; | - case NEXT:" Z7 b) j Y. E) r! G
- next();
, H' P. {; H" l* @ - break;
5 {( W% i! l9 [; F8 [3 C - case INPUT:2 k9 m9 P, S' i; G
- input();
+ u* K) r) _( E4 x - break;
& f! Y ]" F S# w3 W - case GOSUB:6 V, Q$ r! m$ i0 N* l
- gosub();. ~! ^0 b# q, O( F" x
- break;4 S0 t- |5 o! t
- case RETURN:
4 v+ \. ~4 C1 R( B# O - greturn();
2 S/ e& V3 @* z - break;
9 t: u) @, _$ B) b; K - case END:
4 o. N; ?1 K* |/ \- c9 D! o, t& _ - printf("run basic end!"); w% e" i. G$ [
- while(1);
! Z4 ?# a s9 B6 s8 O - exit(0);: z& m+ ~* ?3 `: c8 M; T- x6 A
- }
1 e$ k& c- ]2 [, ~ V- M - }while (tok != FINISHED);
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- }
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参考资料:
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