频率计单片机程序.doc

#includesbit dig1=P20; /接八个数码管（另外P1.0P1.7接七段选信号sbit dig2=P21; / P0.0P0.7接CPLD的dataout0123）sbit dig3=P22;sbit dig4=P23;sbit dig5=P24;sbit dig6=P25;sbit dig7=P26;sbit dig8=P27;sbit latch=P30;sbit clrdata=P34; /与CPLD的clrdata相连接sbit digisele2=P35; /digisele2、digisele1、digisele0与CPLD的sbit digisele1=P36; / digisel210相连接sbit digisele0=P37;#define T0_High_Init 0xfa;#define T0_Low_Init 0x00;unsigned int counter;unsigned char digit1,digit2,digit3,digit4,digit5,digit6,digit7,digit8;int segment716=0x7E,0x30,0x6D,0x79,0x33,0x5B,0x5F,0x70,0x7F,0x7B,0x77,0x1F,0x4E,0x3D,0x4F,0x47;unsigned char indata;void initial(void) /初始化，设定工作方式及中断 counter=0; TMOD=0x11; /定时器工作方式 TH0=T0_High_Init; /设置定时器初始值 TL0=T0_Low_Init; TR0=1; /启动定时器 ET0=1; /允许定时器中断 EA=1; /开中断void delay() /延迟 int t; for (t=0;t10;t+) int latchhigh(void) /判断latch是否为高电平 int flag; if (latch) delay(); if (latch) flag=1; else flag=0;else flag=0;return flag;int latchlow(void) /判断latch是否为低电平 int flag; if (!latch) delay(); if (!latch) flag=1; else flag=0;else flag=0;return flag;void getdata(void) digisele2=0; digisele1=0; digisele0=0; delay(); indata=P0; digit8=indata&0x0f; digisele0=1; delay(); indata=P0; digit7=indata&0x0f; digisele1=1; digisele0=0; delay(); indata=P0; digit6=indata&0x0f; digisele0=1; delay(); indata=P0; digit5=indata&0x0f; digisele2=1; digisele1=0; digisele0=0; delay(); indata=P0; digit4=indata&0x0f; digisele0=1; delay(); indata=P0; digit3=indata&0x0f; digisele1=1; digisele0=0; delay(); indata=P0; digit2=indata&0x0f; digisele0=1; delay(); indata=P0; digit1=indata&0x0f;void main() /主函数 initial(); while(1)while(latchhigh();getdata(); clrdata=0; delay();clrdata=1;while(latchlow();void displaydigit(unsigned int digitselected)/点亮数码管 if (digitselected=1) dig8=1;P1=segment7digit1;/段选整体赋值dig1=0; if (digitselected=2) dig1=1;P1=segment7digit2;dig2=0; if (digitselected=3) dig2=1;P1=segment7digit3;dig3=0; if (digitselected=4) dig3=1;P1=segment7digit4;dig4=0; if (digitselected=5) dig4=1;P1=segment7digit5;dig5=0; if (digitselected=6) dig5=1;P1=segment7digit6;dig6=0; if (digitselected=7) dig6=1;P1=segment7digit7;dig7=0; if (digitselected=8) dig7=1;P1=segment7digit8;dig8=0;void display(void) interrupt 1/中断处理函