单片机课程设计--点阵式LED简单图形显示.doc
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点阵式LED简单图形显示
1. 实验任务
在8X8点阵式LED显示“★”、“●”和心形图,通过按键来选择要显示的图形。
2. 电路原理图
图4.26.1
3. 硬件系统连线
(1). 把“单片机系统”区域中的P1端口用8芯排芯连接到“点阵模块”区域中的“DR1-DR8”端口上;
(2). 把“单片机系统”区域中的P3端口用8芯排芯连接到“点阵模块”区域中的“DC1-DC8”端口上;
(3). 把“单片机系统”区域中的P2.0/A8端子用导线连接到“独立式键盘”区域中的SP1端子上;
4. 程序设计内容
(1). “★”在8X8LED点阵上显示图如下图所示
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●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
12H,14H,3CH,48H,3CH,14H,12H,00H
(2). “●”在8X8LED点阵上显示图如下图所示
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●
●
●
●
●
●
●
●
●
●
●
●
00H,00H,38H,44H,44H,44H,38H,00H
(3). 心形图在8X8LED点阵上显示图如下图所示
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●
●
●
●
●
●
●
●
●
●
●
●
●
●
30H,48H,44H,22H,44H,48H,30H,00H
5. 汇编源程序CNTA EQU 30HCOUNT EQU 31HORG 00HLJMP STARTORG 0BHLJMP T0XORG 30HSTART: MOV CNTA,#00HMOV COUNT,#00HMOV TMOD,#01HMOV TH0,#(65536-4000) / 256MOV TL0,#(65536-4000) MOD 256SETB TR0SETB ET0SETB EAWT: JB P2.0,WTMOV R6,#5MOV R7,#248D1: DJNZ R7,$DJNZ R6,D1JB P2.0,WTINC COUNTMOV A,COUNTCJNE A,#03H,NEXTMOV COUNT,#00HNEXT: JNB P2.0,$SJMP WTT0X: NOPMOV TH0,#(65536-4000) / 256MOV TL0,#(65536-4000) MOD 256MOV DPTR,#TABMOV A,CNTAMOVC A,@A+DPTRMOV P3,AMOV DPTR,#GRAPHMOV A,COUNTMOV B,#8MUL ABADD A,CNTAMOVC A,@A+DPTRMOV P1,AINC CNTAMOV A,CNTACJNE A,#8,NEXMOV CNTA,#00HNEX: RETITAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FHGRAPH: DB 12H,14H,3CH,48H,3CH,14H,12H,00HDB 00H,00H,38H,44H,44H,44H,38H,00HDB 30H,48H,44H,22H,44H,48H,30H,00HEND6. C语言源程序#include AT89X52.Hunsigned char code tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};unsigned char code graph[3][8]={{0x12,0x14,0x3c,0x48,0x3c,0x14,0x12,0x00},{0x00,0x00,0x38,0x44,0x44,0x44,0x38,0x00},{0x30,0x48,0x44,0x22,0x44,0x48,0x30,0x00}};unsigned char count;unsigned char cnta;void main(void){unsi
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