DNA保守序列识别算法的并行化和MPI集群环境构建.doc

CPU键盘扫描实验电路图如下：要求按下s1键时，p3口的8位LED正向流水点亮；按下s2键时，p3口的8位LED反向流水点亮；按下s3键时，p3口的8位LED熄灭；按下s4键时，p3口的8位LED闪烁。程序代码：#includeunsigned char tab =0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f; /段码表sbit S1=P14; /将S1位定义为P1.4引脚sbit S2=P15; /将S2位定义为P1.5引脚sbit S3=P16; /将S3位定义为P1.6引脚sbit S4=P17; /将S4位定义为P1.7引脚 /*流水灯延时*/void delay0()unsigned char i,j;for(i=0;i250;i+) for(j=0;j250;j+) ;/*软件消抖延时*/void delay1()unsigned char i,j;for(i=0;i100;i+) for(j=0;j100;j+) ;/*正转*/void zheng()int i;for(i=0;i=0;i-)P3=tabi;delay0(); /*关闭*/void close()P3=0xff; /*闪烁*/void shan()P3=0xff;delay0();P3=0x00;delay0();void main()int key=0;while(1)P1=0xf0;if(P1&0xf0)!=0xf0)delay1();if(P1&0xf0)!=0xf0)if(S1=0)key=1;if(S2=0)key=2;if(S3=0)key=3;if(S4=0)key=4;switch(key) case 1: zheng(); break; case 2:fan(); break; case 3:close(); break; case 4:shan(); break;说明：在s1键按下后，LED正向流水亮；要想反向亮，按s2键时按下时间长一点。下面介绍一个用951中定时器扫描中断的方法。实验电路图同上，用定时器T1每1ms扫描一次键盘，这样便可以很好地实现键盘控制功能。代码如下：#includeunsigned char tab =0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f; /段码表sbit S1=P14; /将S1位定义为P1.4引脚sbit S2=P15; /将S2位定义为P1.5引脚sbit S3=P16; /将S3位定义为P1.6引脚sbit S4=P17; /将S4位定义为P1.7引脚unsigned char key=0; /*流水灯延时*/void delay0()unsigned char i,j;for(i=0;i250;i+) for(j=0;j250;j+) ;/*软件消抖延时*/void delay1()unsigned char i,j;for(i=0;i100;i+) for(j=0;j100;j+) ;/*正转*/void zheng()int i;for(i=0;i=0;i-)P3=tabi;delay0(); /*关闭*/void close()P3=0xff; /*闪烁*/void shan()P3=0xff;delay0();P3=0x00;delay0();void main()TMOD=0x10; /定时器1工作与状态1EA=1;/开总中断ET1=1;/开定时器1中断TH1=(65536-1000)/256;/每1毫秒扫描一次TL1=(65536-1000)%256;TR1=1;/启动定时器1while(1)switch(key) case 1: zheng(); break; case 2:fan(); break; case 3:close(); break; case 4:shan(); break;void int1() interrupt 3 using 0P1=0xf0;TR1=0;if(P1&0xf0)!=0xf0)/判断是否有按键按下delay1();/用软件延时消抖if(P1&0xf0)!=0xf0)/再判断if(S1=0)key=