电路与系统仿真实践报告.docx

一 设计目的与意义通过设计一个简单的实际应用输入控制显示系统，掌握protues仿真软件的使用。同时，加深理解汉字在LED上的显示原理，增加对电子仿真的兴趣。LED点阵显示屏是集微电子技术、计算机技术、信息处理技术于一体的大型显示屏系统。它以其色彩鲜艳，动态范围广，亮度高，寿命长，工作稳定可靠等优点而成为众多显示媒体以及户外作业显示的理想选择。同时也可广泛应用到军事、车站、宾馆、体育、新闻、金融、证券、广告以及交通运输等许多行业。由于受到存储器本身的局限，其特殊字符往往难以显示，同时显示内容也不能随意更改。因此就提出了一种利用PC机和单片机控制的LED显示系统通信方法。该方法可以对显示内容进行实时控制，从而实现诸如动态显示效果。同时用户也可以在PC机上进行显示效果的预览，显示内容亦可以即时修改。同时它具有发光率高、使用寿命长、组态灵活、色彩丰富以及对室内外环境适应能力强等优点。并广泛的用于公交汽车、商店、体育场馆、车站、学校、银行、高速公路等公共场所的信息发布和广告宣传。二 功能与操作说明1、 功能（1） 可显示汉字、英文和符号。（2） 分幅静止显示功能。（3） 移动循环显示功能，上移依次显示字符为“托普信息职业技术学院”。2、 操作上电运行即可三 硬件设计图1 硬件电路组成框图各功能模块电路的设计1、列控制电路三组74LS138用于控制LED点阵显示屏的24列，E1引脚为3线-8线译码器的输出使能端，由P1.0P1.5端口控制。A、B、C为3线-8线译码器的输入端，信号由单片机的P2.0P2.2端口给出。Y0Y7为输出端，用于选中所要点亮的列。图2 74LS1382、数据输出电路在本设计中，74LS595用于输出3线-8线译码器所选中的列的数据，来控制该列中哪些LED应该点亮。在很短的时间内，循环点亮24列，凭借人眼的视觉暂留效果，就可以看到一幅循环点亮的字幕。74LS595是8位串行输入并行输出的锁存器，每一个上升沿，可以使SH_CP向移位寄存器输入一位数据，等到8位数据全部输入完毕时，ST_CP端的上升沿，可以使移位寄存器内的数据并行输入到数据寄存器，当OE端为低电平时，数据寄存器内的数据向外输出。可见，数据的串入移位与并行输出是相互独立的，可以实现输出上一组数据的同时串入下一组数据。图3 74LS5953、显示屏在此次设计中，要求用3线-8线译码器输出控制显示屏的列，因此，在用88的LED点阵块组合时，要清楚哪些引脚控制行、那些引脚控制列，然后再组合起来并且给各引脚编号，就能达到预期的效果。图4 判断8*8点阵的逻辑引脚 图5 布线方式采用网络标号图6 LED显示屏整体电路图（用Proteus仿真）图7（24*24点阵LED条幅显示屏的电路原理图）四 软件设计软件程序主要由开始、初始化、主程序、字库组成。其中主程序的流程图如图8所示。图8主程序流程图图9程序流程图下面的程序能够用来实现滚动显示汉字的显示。程序清单如下：ORG 0HLJMP STARTORG 0BHLJMP INTT0START:MOV 20H,#00H MOV A,#0FFH MOV R7,#0 MOV P1,A MOV P2,A MOV P3,A MOV P0,A CLR P1.6 MOV TMOD,#01H MOV TH0,#0FEH MOV TL0,#18H MOV SCON,#0 MOV IE,#82H MOV SP,#70H MOV R0,#0MAIN:LCALL DIS1 MOV DPTR,#TAB LCALL MOVDISP LJMP MAINMOVDISP:MOV B,#00HDISLOOP:MOV R3,#07HDISMOV:JNB 02H,AAA DEC DPH CLR 02AAA:MOV R2,#0 MOV R1,B SETB TR0WAITMOV:JBC 01H,DISMOV1 AJMP WAITMOVDISMOV1:DJNZ R3,DISMOV JNB 02H,BBB DEC DPH CLR 02BBB:INC B MOV A,B CJNE A,#0,CC0 INC DPH INC R7CC0:INC B MOV A,B CJNE A,#0,CC1 INC DPH INC R7CC1:INC B MOV A,B CJNE A,#0,CCC INC DPH INC R7CCC:MOV A,R1 MOVOUT:CJNE R7,#3,DISLOOP MOV A,B CJNE A,#24,DISLOOP MOV R7,#0 RETDIS1:MOV R3,#0AH CLR P1.3 CLR P1.4 CLR P1.5DIS11:MOV R2,#0 MOV DPTR,#TAB MOV R1,#0H SETB TR0WAIT11:JBC 01H,DIS111 AJMP WAIT11DIS111:DJNZ R3,DIS11 RETINTT0:INC R0 PUSH ACC MOV TH0,#0FEH MOV TL0,#18H JBC 00H,GOEND MOV A,R1 MOVC A,A+DPTR MOV SBUF,AWAIT:JBC TI,GO AJMP WAITGO: INC R1 CJNE R1,#0,AA INC DPH SETB 02HAA: MOV A,R1 MOVC A,A+DPTR MOV SBUF,AWAIT1:JBC TI,GO1 AJMP WAIT1GO1:INC R1 CJNE R1,#0,BB INC DPH SETB 02HBB: MOV A,R1 MOVC A,A+DPTR MOV SBUF,AWAIT2:JBC TI,GO2 AJMP WAIT2GO2:CLR P1.3 CLR P1.4 CLR P1.5 NOP SETB P1.6 NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP NOP CLR P1.6 MOV A,R2 ANL A,#7H ANL P1,#0F8H ORL P1,AP122:INC R2 CJNE R2,#8,PAN1 LJMP PAN1APAN1:JC PAN1A CJNE R2,#10H,PAN2 LJMP PAN1BPAN2:JC PAN1B CJNE R2,#018H,PAN3 LJMP PAN1CPAN3:JC PAN1C AJMP PANTPAN1A:SETB P1.3 AJMP PANTPAN1B:SETB P1.4 AJMP PANTPAN1C:SETB P1.5PANT:INC R1; CJNE R1,#0,CC INC DPH SETB 02HCC: MOV A,R2GO3:CJNE R2,#24,GO4 SETB 00HGO4:POP ACC RETIGOEND:CLR TR0 SETB 01H POP ACC RETIORG 0A00HTAB:;24*24点阵汉字表：12个字托普信息职业技术学院DB 00H,00H,00H,00H,010H,00H,00H,010H,00H,00H,038H,00H ;*DB 00H,038H,00H,00H,038H,00H,00H,07CH,00H,00H,07CH,00HDB 00H,07CH,00H,0FFH,0FFH,0FEH,07FH,0FFH,0FCH,01FH,0FFH,0F0HDB 0FH,0FFH,0E0H,03H,0FFH,080H,01H,0FFH,00H,03H,0FFH,080HDB 030H,0FFH,080H,03H,0FFH,080H,07H,0EFH,0C0H,07H,083H,0C0HDB 07H,01H,0C0H,0CH,00H,060H,08H,00H,020H,00H,00H,00HDB 06H,00H,00H,07H,00H,00H,03H,00H,00H,03H,01H,0C0H ;托DB 03H,01H,0E0H,03H,03H,0C0H,03H,07H,00H,03H,09EH,00HDB 07H,0F6H,00H,03FH,06H,00H,013H,06H,0F0H,03H,087H,0E0HDB 03H,01EH,00H,07H,076H,00H,0FH,06H,02H,03BH,06H,02HDB 0F3H,06H,03H,0E3H,06H,07H,043H,07H,0FH,0FH,03H,0FEHDB 07H,00H,0FCH,06H,00H,00H,00H,00H,00H,00H,00H,00HDB 00H,01H,080H,01H,0C3H,080H,00H,0C6H,00H,00H,049H,0C0H;普DB 00H,03FH,0E0H,03H,0FEH,00H,00H,066H,040H,00H,066H,0E0HDB 06H,067H,080H,03H,067H,00H,03H,066H,07CH,00H,0FFH,0FEHDB 0FFH,0E0H,00H,078H,00H,00H,00H,01FH,00H,03H,0F3H,080HDB 03H,03H,080H,01H,0BBH,080H,01H,0F3H,00H,01H,083H,00HDB 01H,083H,00H,01H,0FBH,00H,01H,0C7H,00H,01H,083H,00HDB 00H,00H,00H,03H,07H,080H,03H,083H,080H,03H,081H,080H;信DB 03H,00H,08H,07H,01H,0FEH,06H,0FFH,0FEH,0CH,060H,00HDB 0EH,00H,0C0H,01EH,0FH,0E0H,036H,00H,00H,066H,00H,00HDB 046H,07H,0C0H,086H,0EH,00H,06H,00H,00H,06H,01H,0F0HDB 06H,03FH,0F8H,06H,018H,070H,06H,018H,060H,06H,018H,0E0HDB 06H,0FH,0E0H,06H,08H,00H,00H,00H,00H,00H,00H,00HDB 00H,030H,00H,00H,038H,00H,00H,030H,00H,00H,060H,00H;息DB 00H,05FH,080H,03H,0FBH,0C0H,03H,081H,0C0H,01H,09DH,080HDB 01H,0F9H,080H,01H,081H,080H,01H,09FH,080H,01H,0FBH,00HDB 01H,083H,00H,01H,08FH,00H,01H,0FFH,00H,00H,083H,070HDB 08H,018H,03CH,0AH,01CH,01EH,01BH,0CH,04H,039H,080H,040HDB 030H,0E0H,060H,010H,078H,030H,00H,03FH,0F8H,00H,0FH,0E0HDB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,0F0H,00H;职DB 01FH,0F0H,070H,07EH,0CFH,0FCH,0CH,0E6H,038H,0CH,0C6H,030HDB 0FH,0C6H,030H,0EH,0C6H,060H,0CH,0C3H,0F0H,0DH,0C3H,080HDB 0FH,0C0H,00H,0CH,0C2H,060H,0CH,0F3H,030H,0FH,0C6H,018HDB 01FH,0C6H,01CH,07CH,0CCH,0EH,020H,0D8H,06H,00H,0F0H,06HDB 00H,0C0H,00H,00H,0C0H,00H,00H,040H,00H,00H,00H,00HDB 00H,00H,00H,00H,0EH,00H,00H,07H,00H,01H,0C6H,00H;业DB 00H,0E6H,00H,00H,0E6H,00H,00H,066H,00H,00H,066H,030HDB 00H,066H,070H,08H,066H,070H,0CH,066H,0E0H,06H,066H,0C0HDB 07H,067H,080H,03H,066H,00H,00H,066H,00H,00H,066H,00HDB 00H,066H,00H,00H,067H,0FCH,03H,0FFH,0FEH,03FH,080H,00HDB 00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00HDB 06H,06H,00H,07H,07H,00H,03H,083H,080H,03H,083H,00H;技DB 03H,03H,00H,03H,03H,070H,03H,07H,0E0H,07H,0DFH,00HDB 07FH,03H,00H,033H,03H,00H,03H,03H,060H,03H,087H,0F0HDB 03H,03CH,060H,0FH,010H,0C0H,03BH,0DH,080H,0F3H,07H,080HDB 063H,03H,00H,03H,07H,080H,03H,0DH,0E0H,03H,038H,0F8HDB 0FH,0E0H,07FH,07H,00H,01CH,02H,00H,00H,00H,00H,00HDB 00H,060H,00H,00H,070H,00H,00H,039H,0C0H,00H,030H,0E0H;术DB 00H,030H,060H,00H,030H,00H,00H,030H,00H,00H,03FH,0C0HDB 03H,0FFH,080H,0FH,0F0H,00H,00H,078H,00H,00H,0FCH,00HDB 01H,0F6H,00H,01H,0B3H,00H,03H,031H,080H,06H,031H,0E0HDB 0CH,030H,0F8H,018H,030H,07FH,030H,030H,038H,040H,030H,00HDB 00H,030H,00H,00H,030H,00H,00H,030H,00H,00H,00H,00HDB 00H,01H,080H,00H,031H,0C0H,03H,039H,080H,03H,099H,080H;学DB 01H,09BH,00H,00H,083H,00H,00H,0FH,0F8H,09H,0FCH,01CHDB 01FH,00H,03CH,018H,06H,030H,038H,07FH,00H,031H,0E6H,00HDB 010H,0CH,00H,00H,018H,00H,0DH,0F0H,00H,06H,0FFH,0F8HDB 01FH,0CCH,00H,0CH,0CH,00H,00H,0CH,00H,00H,0CH,00HDB 00H,0CH,00H,00H,07CH,00H,00H,03CH,00H,00H,018H,00HDB 00H,00H,00H,00H,0CH,00H,03H,0EH,00H,07H,087H,00H;院DB 07FH,00H,0F0H,033H,02FH,0F8H,036H,070H,078H,034H,060H,040HDB 036H,043H,00H,033H,05FH,00H,03FH,00H,00H,037H,01H,0E0HDB 032H,03FH,0C0H,030H,07BH,00H,030H,01BH,00H,030H,01B