28第四章26点阵式LED简单图形显示技术

AT89S51单片机实验及实践教程-153-26．点阵式LED简单图形显示技术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4.26.13．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12345678●●●●●AT89S51单片机实验及实践教程-154-●●●●●●●●●●●●●●●●12H，14H，3CH，48H，3CH，14H，12H，00H(2)．“●”在8X8LED点阵上显示图如下图所示12345678●●●●●●●●●●●●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12345678●●●●●●●●●●●●●●30H，48H，44H，22H，44H，48H，30H，00H5．汇编源程序CNTAEQU30HCOUNTEQU31HORG00HLJMPSTARTORG0BHLJMPT0XORG30HSTART:MOVCNTA,#00HMOVCOUNT,#00HMOVTMOD,#01HAT89S51单片机实验及实践教程-155-MOVTH0,#(65536-4000)/256MOVTL0,#(65536-4000)MOD256SETBTR0SETBET0SETBEAWT:JBP2.0,WTMOVR6,#5MOVR7,#248D1:DJNZR7,$DJNZR6,D1JBP2.0,WTINCCOUNTMOVA,COUNTCJNEA,#03H,NEXTMOVCOUNT,#00HNEXT:JNBP2.0,$SJMPWTT0X:NOPMOVTH0,#(65536-4000)/256MOVTL0,#(65536-4000)MOD256MOVDPTR,#TABMOVA,CNTAMOVCA,@A+DPTRMOVP3,AMOVDPTR,#GRAPHMOVA,COUNTMOVB,#8MULABADDA,CNTAMOVCA,@A+DPTRMOVP1,AINCCNTAMOVA,CNTACJNEA,#8,NEXMOVCNTA,#00HNEX:RETITAB:DB0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FHGRAPH:DB12H,14H,3CH,48H,3CH,14H,12H,00HDB00H,00H,38H,44H,44H,44H,38H,00HDB30H,48H,44H,22H,44H,48H,30H,00HEND6．C语言源程序#includeAT89X52.Hunsignedcharcodetab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};AT89S51单片机实验及实践教程-156-unsignedcharcodegraph[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}};unsignedcharcount;unsignedcharcnta;voidmain(void){unsignedchari,j;TMOD=0x01;TH0=(65536-4000)/256;TL0=(65536-4000)%256;TR0=1;ET0=1;EA=1;while(1){if(P2_0==0){for(i=5;i0;i--)for(j=248;j0;j--);if(P2_0==0){count++;if(count==3){count=0;}while(P2_0==0);}}}}voidt0(void)interrupt1using0{TH0=(65536-4000)/256;TL0=(65536-4000)%256;P3=tab[cnta];P1=graph[count][cnta];cnta++;if(cnta==8){cnta=0;}}