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 30H COUNT EQU 31H ORG 00H LJMP START ORG 0BH LJMP T0X ORG 30H START: MOV CNTA,#00H MOV COUNT,#00H MOV TMOD,#01H MOV TH0,#(65536-4000) / 256 MOV TL0,#(65536-4000) MOD 256 SETB TR0 SETB ET0 SETB EA WT: JB P2.0,WT MOV R6,#5 MOV R7,#248 D1: DJNZ R7,$ DJNZ R6,D1 JB P2.0,WT INC COUNT MOV A,COUNT CJNE A,#03H,NEXT MOV COUNT,#00H NEXT: JNB P2.0,$ SJMP WT T0X: NOP MOV TH0,#(65536-4000) / 256 MOV TL0,#(65536-4000) MOD 256 MOV DPTR,#TAB MOV A,CNTA MOVC A,@A+DPTR MOV P3,A MOV DPTR,#GRAPH MOV A,COUNT MOV B,#8 MUL AB ADD A,CNTA MOVC A,@A+DPTR MOV P1,A INC CNTA MOV A,CNTA CJNE A,#8,NEX MOV CNTA,#00H NEX: RETI TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH GRAPH: DB 12H,14H,3CH,48H,3CH,14H,12H,00H DB 00H,00H,38H,44H,44H,44H,38H,00H DB 30H,48H,44H,22H,44H,48H,30H,00H END 6． C语言源程序 #include AT89X52.H unsigned 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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