第8章键盘显示接口技术--显示器ppt课件.ppt

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1、第八章：第八章：5151系列单片机键盘系列单片机键盘/ /显示器接口技显示器接口技术术 常用的显示设备：常用的显示设备： 发光二极管、八段发光二极管、八段LEDLED显示器、点阵显示器、点阵LEDLED，液晶显示器（液晶显示器（LCDLCD）、屏幕显示器（）、屏幕显示器（CRTCRT）等。）等。 8.1 LED8.1 LED显示器接口技术显示器接口技术 8.2 8.2 键盘接口技术键盘接口技术 8.3 8.3 点阵接口技术点阵接口技术 8.4 8.4 液晶显示器接口技术液晶显示器接口技术8.1 518.1 51单片机显示器接口技术单片机显示器接口技术1 1、LEDLED显示器结构与原理显示器结

2、构与原理： （1 1）结构：）结构：LEDLED封装图封装图共阴极共阴极LEDLED共阳极共阳极LEDLED（2 2）LEDLED显示器的基本问题显示器的基本问题 a.a.七段码问题七段码问题 共阳极、共阴极七段码共阳极、共阴极七段码 如显示如显示“0”,0”,共阴极七段码：共阴极七段码： dpdp g f e d c b a g f e d c b a 0 0 1 1 1 1 1 1 0 0 1 1 1 1 1 1 3FH3FH 共阳极七段码：共阳极七段码： dpdp g f e d c b a g f e d c b a 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0C

3、0H0C0H 共阴极七段码表共阴极七段码表：unsigned char code daima16=unsigned char code daima16= 0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71;0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71; b.b.驱动问题驱动问题 LEDLED显示器的每一个段显示器

4、的每一个段通常需要通常需要1 15mA电流。电流。 段驱动、位驱动；段驱动、位驱动； 段口、位口段口、位口 c.c.显示方式问题显示方式问题 静态显示、动态显示静态显示、动态显示 d.d.译码方式问题译码方式问题 硬件译码：硬件译码：采用专用译码器芯片实现，如采用专用译码器芯片实现，如CD4511CD4511、74477447等芯片等芯片 软件译码：软件译码：采用软件查表的方法，如显示采用软件查表的方法，如显示“3”3”： unsigned char code table16=unsigned char code table16= 0 x3F,0 x06,0 x5B,0 x4F,0 x66,0

5、 x6D,0 x7D,0 x27,0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71;0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71; unsigned char unsigned char i,ji,j; ; i=0 x03; /i=0 x03; / j=j=tableitablei; /; /查表，转换成查表，转换成7 7段码段码 (3) (3) 显示函数的编写问题显示函数的编写问题 a.a.建立建立7

6、7段码表段码表 b.b.建立显示缓冲区建立显示缓冲区 通常，显示缓冲区中存放要显示的内容，对应通常，显示缓冲区中存放要显示的内容，对应于每个显示器，显示缓冲区的数据由其他函数于每个显示器，显示缓冲区的数据由其他函数或主函数来修改。或主函数来修改。 c.c.编制显示函数编制显示函数 显示函数只完成将显示缓冲区中的数据通过查显示函数只完成将显示缓冲区中的数据通过查表转换成表转换成7 7段码送显示器显示。段码送显示器显示。 d.d.显示函数的调用显示函数的调用 在主函数或其他函数中调用显示函数。在主函数或其他函数中调用显示函数。 例如：例如：2 2位显示器显示函数的编写位显示器显示函数的编写 uns

7、igned char dis_buf2;unsigned char dis_buf2;/显示缓冲区显示缓冲区 unsigned char code table16=unsigned char code table16=0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71;0 x7C,0 x39,0 x5E,0 x79,0 x71

8、; void void Disp(voidDisp(void) ) /2 /2位数码管显示函数位数码管显示函数 unsigned char unsigned char i i; ; i=dis_buf0; / i=dis_buf0; /取显示内容取显示内容 P1= P1=tableitablei; /7; /7段码送显示器段码送显示器 i=dis_buf1; i=dis_buf1; P3= P3=tableitablei; （4 4）LEDLED显示器静态显示显示器静态显示 1 1、一个、一个8 8位端口位端口控制控制1 1位位LEDLED显示显示器；器； 2 2、不改变显示内、不改变显示内容

9、，显示器一直容，显示器一直显示不变；显示不变； 3 3、硬件复杂，软、硬件复杂，软件控制简单。件控制简单。例例1 1：利用：利用P2P2、P3P3口进行静态显示：轮流显口进行静态显示：轮流显示示“12”12”、“-”-”、“AB”AB”ahabcdefgbcdefghR1A02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19AB/BA1U274LS245A02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19AB/BA1U374LS245XTAL218XTAL119

10、ALE30EA31PSEN29RST9P0.0/AD039P0.1/AD138P0.2/AD237P0.3/AD336P0.4/AD435P0.5/AD534P0.6/AD633P0.7/AD732P1.0/T21P1.1/T2EX2P1.23P1.34P1.45P1.56P1.67P1.78P3.0/RXD10P3.1/TXD11P3.2/INT012P3.3/INT113P3.4/T014P3.7/RD17P3.6/WR16P3.5/T115P2.7/A1528P2.0/A821P2.1/A922P2.2/A1023P2.3/A1124P2.4/A1225P2.5/A1326P2.6/A1

11、427U1AT89C52 #include #include unsigned char dis_buf2;unsigned char dis_buf2; / /显示缓冲区显示缓冲区 unsigned char code table18=unsigned char code table18= 0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,

12、0 x71,0 x40,0 x00;77,0 x7C,0 x39,0 x5E,0 x79,0 x71,0 x40,0 x00; void void dl(unsigneddl(unsigned intint x) x) / /延时延时xmsxms unsigned unsigned intint t1,t2; t1,t2;for (t1=0;t1x;t1+)for (t1=0;t1x;t1+)for (t2=0;t2120;t2+) ;for (t2=0;t2120;t2+) ; void void display(voiddisplay(void) /) /显示函数显示函数 P2=table

13、dis_buf0; /P2=tabledis_buf0; /静态显示静态显示1 1P3=tabledis_buf1; /P3=tabledis_buf1; /静态显示静态显示2 2 void void main(voidmain(void) ) while(1)while(1) dis_buf0=1; dis_buf1=2;/dis_buf0=1; dis_buf1=2;/送显示数据送显示数据1212display();display(); /调显示函数调显示函数dl(500); dl(500); /延时延时500ms 500ms dis_buf0=16; dis_buf1=16;dis_bu

14、f0=16; dis_buf1=16; /显示显示-display();display(); dl(500);dl(500);dis_buf0=0 x0a; dis_buf1=0 x0b; /dis_buf0=0 x0a; dis_buf1=0 x0b; /显示显示ababdisplay();display(); dl(500);dl(500); 例例2 2：利用：利用8255PA8255PA、PBPB、PCPC口进行静态显口进行静态显示：轮流显示示：轮流显示“123”123”、“abcabc”PA7PC7PC0PC1PC2PC3PC4PC5PC0PC6PC1PC7PC2PC3PC4PC5PC

15、6PA0PA5PA1PA6PA2PA7PA3PA4PA5PA6PA0PA1PA2PA3PA4XTAL218XTAL119ALE30EA31PSEN29RST9P0.0/AD039P0.1/AD138P0.2/AD237P0.3/AD336P0.4/AD435P0.5/AD534P0.6/AD633P0.7/AD732P1.0/T21P1.1/T2EX2P1.23P1.34P1.45P1.56P1.67P1.78P3.0/RXD10P3.1/TXD11P3.2/INT012P3.3/INT113P3.4/T014P3.7/RD17P3.6/WR16P3.5/T115P2.7/A1528P2.0/

16、A821P2.1/A922P2.2/A1023P2.3/A1124P2.4/A1225P2.5/A1326P2.6/A1427U1AT89C52PROGRAM=.例2程序例2.hexD034D133D232D331D430D529D628D727RD5WR36A09A18RESET35CS6PA04PA13PA22PA31PA440PA539PA638PA737PB018PB119PB220PB321PB422PB523PB624PB725PC014PC115PC216PC317PC413PC512PC611PC710U58255AA02B018A13B117A24B216A35B315A46

17、B414A57B513A68B612A79B711CE19AB/BA1U274LS245A02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19AB/BA1U374LS245A02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19AB/BA1U474LS245 #include #include #include #include #define COM8255 XBYTE0 xbfff#define COM8255 XBYTE0 xbfff #define PA82

18、55 XBYTE0 xbcff#define PA8255 XBYTE0 xbcff #define PB8255 XBYTE0 xbdff#define PB8255 XBYTE0 xbdff #define PC8255 XBYTE0 xbeff#define PC8255 XBYTE0 xbeff unsigned char dis_buf3;unsigned char dis_buf3; / /显示缓冲区显示缓冲区 unsigned char code table18=unsigned char code table18= 0 x3F,0 x06,0 x5B,0 x4F,0 x66,0

19、 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71,0 x40,0 x00;77,0 x7C,0 x39,0 x5E,0 x79,0 x71,0 x40,0 x00; void void dl(unsigneddl(unsigned intint x) x) / /延时延时xmsxms unsigned unsigned intint t1,t2; t1,t2;for (t1=0;t1x;t1

20、+)for (t1=0;t1x;t1+)for (t2=0;t2120;t2+) ;for (t2=0;t2120;t2+) ; void void display(voiddisplay(void) ) PA8255=tabledis_buf0;PA8255=tabledis_buf0;PB8255=tabledis_buf1;PB8255=tabledis_buf1;PC8255=tabledis_buf2; PC8255=tabledis_buf2; void void main(voidmain(void) ) COM8255=0 x80;COM8255=0 x80;/8255/825

21、5初始化初始化while(1)while(1) dis_buf0=1; dis_buf0=1; dis_buf1=2; dis_buf1=2; dis_buf2=3; / dis_buf2=3; /显示显示123123 display(); display(); /调显示函数调显示函数 dl(500); /dl(500); /延时延时500ms 500ms dis_buf0=0 x0a; dis_buf0=0 x0a; dis_buf1=0 x0b; dis_buf1=0 x0b; dis_buf2=0 x0c; dis_buf2=0 x0c; / /显示显示abcabc display();

22、 display(); dl(500); dl(500); （5 5）LEDLED动态显示动态显示 动态显示即一位一位轮流点亮各位显示器，动态显示即一位一位轮流点亮各位显示器，采用动画模式。采用动画模式。理解：段口和位口的含义理解：段口和位口的含义 unsigned char dis_buf8 ;unsigned char dis_buf8 ; / /显示缓冲区显示缓冲区 unsigned char code table16=unsigned char code table16=0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6

23、F,0 x77,0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71;0 x7C,0 x39,0 x5E,0 x79,0 x71; void void d dispisplaylay(void(void) ) unsigned char unsigned char i i; ;unsigned char unsigned char bitcodebitcode=0 xfe;=0 xfe;/位码位码for(for(i i=0;=0;i i8;8;i i+)+)

24、 DUANKOUDUANKOU= =tabletable dis_bufdis_buf i i; / /送段码送段码WEIKOUWEIKOU= =bitcodebitcode; ; /位码位码dldl_ _msms();(); /延时延时1ms1ms WEIKOU=0 xff; /WEIKOU=0 xff; /关闭显示关闭显示bitcodebitcode=_crol_(=_crol_(bitcodebitcode,1);/,1);/位码左循环移位位码左循环移位 例例3 3：利用：利用P0P0、P3P3口进行动态显示：显示口进行动态显示：显示“123456”123456”XTAL218XTAL1

25、19ALE30EA31PSEN29RST9P0.0/AD039P0.1/AD138P0.2/AD237P0.3/AD336P0.4/AD435P0.5/AD534P0.6/AD633P0.7/AD732P1.0/T21P1.1/T2EX2P1.23P1.34P1.45P1.56P1.67P1.78P3.0/RXD10P3.1/TXD11P3.2/INT012P3.3/INT113P3.4/T014P3.7/RD17P3.6/WR16P3.5/T115P2.7/A1528P2.0/A821P2.1/A922P2.2/A1023P2.3/A1124P2.4/A1225P2.5/A1326P2.6/

26、A1427U1AT89C52A02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19AB/BA1U274LS24512U1:A740734U1:B740756U1:C740798U1:D74071110U1:E74071312U1:F7407 #include #include #include #include unsigned char dis_buf6=0; /unsigned char dis_buf6=0; /显示缓冲区显示缓冲区 unsigned char code unsigned char code table16

27、=0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7table16=0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 xD,0 x27,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71;71; void void dl_msdl_ms()() / /延时延时1ms1ms unsigned unsigned intint j; j;for (j=0;j150;j+) ;for (j=0;j

28、150;j+) ; void void display(voiddisplay(void) ) unsigned char i;unsigned char i;unsigned char unsigned char bitcodebitcode=0 xfe;=0 xfe;/位码位码for(ifor(i=0;i6;i+)=0;i6;i+) P0= P0=tabledis_bufitabledis_bufi; / /送段码送段码 P3=P3=bitcodebitcode; ; / /位码位码 dl_msdl_ms();(); / /延时延时1ms1ms P3=0 xff; P3=0 xff; /

29、/关闭显示关闭显示 bitcodebitcode=_crol_(bitcode,1); /=_crol_(bitcode,1); /位码左循环移位位码左循环移位 void void main(voidmain(void) ) dis_buf0=1; dis_buf1=2;dis_buf0=1; dis_buf1=2;dis_buf2=3; dis_buf3=4;dis_buf2=3; dis_buf3=4; dis_buf4=5; dis_buf5=6; dis_buf4=5; dis_buf5=6; while(1)while(1) display();display(); A15 A14

30、A13 A12 A11 A10 A9 A8 A7-A0A15 A14 A13 A12 A11 A10 A9 A8 A7-A0 1 1 0 0 1 1 1 1 1 1 1 1 0 00 0 1 - 1 1 - 1 0 10 1 1 01 0 1 11 1 82558255端口地址：端口地址：BCFFHBFFFHBCFFHBFFFH例例4 4：利用：利用8255A8255A控制动态显示控制动态显示PAPA口为段口，口为段口，PBPB口为位口口为位口74LS24574LS245、74077407均为同向驱动器。均为同向驱动器。例例4 4：利用：利用82558255进行动态显示：显示进行动态显示：显示

31、“12345678”12345678”XTAL218XTAL119ALE30EA31PSEN29RST9P0.0/AD039P0.1/AD138P0.2/AD237P0.3/AD336P0.4/AD435P0.5/AD534P0.6/AD633P0.7/AD732P1.0/T21P1.1/T2EX2P1.23P1.34P1.45P1.56P1.67P1.78P3.0/RXD10P3.1/TXD11P3.2/INT012P3.3/INT113P3.4/T014P3.7/RD17P3.6/WR16P3.5/T115P2.7/A1528P2.0/A821P2.1/A922P2.2/A1023P2.3

32、/A1124P2.4/A1225P2.5/A1326P2.6/A1427U0AT89C52D034D133D232D331D430D529D628D727RD5WR36A09A18RESET35CS6PA04PA13PA22PA31PA440PA539PA638PA737PB018PB119PB220PB321PB422PB523PB624PB725PC014PC115PC216PC317PC413PC512PC611PC710U38255AA02B018A13B117A24B216A35B315A46B414A57B513A68B612A79B711CE19AB/BA1U474LS24512

33、U1:A740734U1:B740756U1:C740798U1:D74071110U1:E74071312U1:F740712U2:A740734U2:B7407 #include #include #include #include #include #include #define COM8255 XBYTE0 xbfff#define COM8255 XBYTE0 xbfff #define PA8255 XBYTE0 xbcff#define PA8255 XBYTE0 xbcff #define PB8255 XBYTE0 xbdff#define PB8255 XBYTE0 xb

34、dff #define PC8255 XBYTE0 xbeff#define PC8255 XBYTE0 xbeff unsigned char dis_buf8=1,2,3,4,5,6,7,8;unsigned char dis_buf8=1,2,3,4,5,6,7,8; / /显显示缓冲区示缓冲区 unsigned char code unsigned char code table16=0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x27,table16=0 x3F,0 x06,0 x5B,0 x4F,0 x66,0 x6D,0 x7D,0 x2

35、7,0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71;0 x7F,0 x6F,0 x77,0 x7C,0 x39,0 x5E,0 x79,0 x71; void void dl_msdl_ms()() / /延时延时1ms1ms unsigned unsigned intint j; j;for (j=0;j150;j+) ;for (j=0;j150;j+) ; void void display(voiddisplay(void) ) unsigned char i;unsigned char i;unsigned char unsigned

36、char bitcodebitcode=0 xfe;=0 xfe;/位码位码for(ifor(i=0;i8;i+)=0;i8;i+) PA8255=PA8255=tabledis_bufitabledis_bufi; ; /送段码送段码PC8255=PC8255=bitcodebitcode; ;/位码位码dl_msdl_ms();(); /延时延时1ms1ms PC8255=0 xff; PC8255=0 xff; /关闭显示关闭显示bitcodebitcode=_crol_(bitcode,1);/=_crol_(bitcode,1);/位码左循环移位位码左循环移位 void main()

37、void main() COM8255=0 x80;COM8255=0 x80;/8255/8255初始化初始化while(1)while(1) display();display(); 提高：显示程序的实际问题提高：显示程序的实际问题 前述显示程序是理想仿真下的情况。前述显示程序是理想仿真下的情况。 实际电路板中的显示程序如何呢？实际电路板中的显示程序如何呢？ 与仿真程序相比较，有何区别？与仿真程序相比较，有何区别？PAPA口为段口，口为段口，PBPB口为位口口为位口74LS24574LS245、74077407均为同向驱动器。均为同向驱动器。82558255端口地址：端口地址：BCFFHB

38、CFFHBFFFHBFFFHD140073A53Y65A116Y12VCC144Y84A95Y106A13U474073A53Y65A116Y12VCC144Y84A95Y106A13U37407+5+5C6220UF/25VC5104C4104C3104C21041VS1VC+5C110UFR110K+5AN1AN0AN4AN8AN15AN11AN7AN3AN14AN10AN6AN2AN13AN9AN5AN121CS1A01A11WR1RDCOM3DP5B6A7C4D2E1COM8F9G10LED3COM3DP5B6A7C4D2E1COM8F9G10LED2COM3DP5B6A7C4D2E1

39、COM8F9G10LED1COM3DP5B6A7C4D2E1COM8F9G10LED4COM3DP5B6A7C4D2E1COM8F9G10LED8COM3DP5B6A7C4D2E1COM8F9G10LED5COM3DP5B6A7C4D2E1COM8F9G10LED6COM3DP5B6A7C4D2E1COM8F9G10LED7D034D133D232D331D430D529D628D727PA04PA13PA22PA31PA440PA539PA638PA737PB018PB119PB220PB321PB422PB523PB624PB725PC014PC115PC216PC317PC413PC51

40、2PC611PC710RD5WR36A09A18RESET35CS6GND7VCC26U18255+5A02A13A24A35A46A57A68A79B018B117B216B315B414B513B612B711E19DIR1VCC20U274LS24512345678PIN1+5R32KR42KR52KR62KR72KR82KR92KR102KR25.1KR115.1KR125.1KR135.1KR145.1KR155.1KR165.1KR175.1KR182KL1C101UC111U1234USBC2+4T1I11R1O12C2-5C1+1GND15VCC16R1I13C1-3T1O14

41、V-6V22U6MAX232C7104C8104C9104+5X119X218RESET9RD17WR16P112P0039P0138P0237P0336P0435P0534P0633P0732P2021P2122P2728TXD11RXD10VCC40GND20U5STC12C5A32T11.0592MC1230PC1330P+5R191KK1+5+5+5+5123DS1DS1820+5R204.7K+5D7D6D5D4D3D2D1D0PC 7PC 6PC 5PC 4PC 3PC 2PC 1PC 0PB 7PB 6PB 5PB 4PB 3PB 2PB 1PB 0PA 7PA 6PA 5PA

42、4PA 3PA 2PA 1PA 0DIG4DIG5DIG6DIG7DPGFEDCBADIG3DIG2DIG1DIG0DI G0DI G1DI G2DI G3DI G4DI G5DI G6DI G7PA 0PA 1PA 2PA 3PA 4PA 5PA 6PA 7PB 0PB 1PB 2PB 3PB 4PB 5PB 6PB 7PC 0PC 1PC 2PC 3PC 4PC 5PC 6PC 7RX DTX DX1X2D0D1D2D3D4D5D6D7X2X1WRRDRX DTX DA0A1CSRDWRA1A0CSVCVCVCDSDS void void zhucxzhucx (unsigned char

43、 k) / (unsigned char k) /模拟主程序执行时间模拟主程序执行时间 unsigned unsigned intint i; i;for (i=0;ifor (i=0;ik;ik;i+)+)dl_msdl_ms();(); void main()void main() COM8255=0 x80;COM8255=0 x80;/8255/8255初始化初始化while(1)while(1) display();display();zhucx(1); /zhucx(1); /执行其他主程序执行其他主程序 1 1、82558255的的A1A0A1A0接接A9A9、A8A8，8255

44、A8255A的的CSCS接接A14A14，PAPA、PBPB口接口接8 8位位LEDLED显示器。显示器。 编程使编程使LEDLED显示器每隔显示器每隔1 1秒轮流显示：秒轮流显示： - - -GooDGooD- - -及及-ABCDEF-.-ABCDEF-. 思路：思路： 1 1、修改、修改8255A8255A的端口地址；的端口地址； 2 2、添加、添加7 7段码：段码：“-”-”、“o”o”； 3 3、修改主程序：、修改主程序： 前一秒，显示缓冲区中送前一秒，显示缓冲区中送“-ABCDEF-ABCDEF-” ” 的的7 7段码序号，段码序号， 后一秒，显示缓冲区中送后一秒，显示缓冲区中送“- - -GooDGooD- - -”的的7 7段码序号。段码序号。 4 4、1 1秒延时可调用延时程序。秒延时可调用延时程序。2 2、串行口控制的、串行口控制的LEDLED显示显示