基于定时器的采样周期控制模块设计

//包含头文件 #include <reg52.h> #include <intrins.h> //定义数据类型 #define uchar unsigned char #define uint unsigned int #define XH 20 //学号 //数码管段码表 uchar code SMG_CODE[] = {/*0,1,2,3,4,5,6,7,8,9,n,*/ 0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x5C,0x54,0x71,0x76,0x38,}; uchar array[] = {0,0}; //显示缓冲 //数码管位选引脚 sbit Wei1 = P3^0; sbit Wei2 = P3^1; //LED引脚 sbit LED = P1^7; //计数值 uint Num = 0; //显示标志位 uchar Flag = 0; void delayms(uint x) //延时函数 { uchar i; while(x--)for(i = 0; i < 120; i++); } //显示数值 void Display(void) { P2 = 0x00; Wei1 = 1; Wei2 = 0; P2 = SMG_CODE[array[0]]; delayms(2); P2 = 0x00; Wei1 = 0; Wei2 = 1; P2 = SMG_CODE[array[1]]; delayms(2); } //主函数 void main(void) { //显示学号 array[0] = XH/10; array[1] = XH%10; //初始化定时器 中断 TMOD = 0x51; TH0 = (65536 - 50000)>>8; TL0 = (65536 - 50000)&0xff; ET0 = 1; TH1 = 0; TL1 = 0; EX0 = 1; IT0 = 1; EX1 = 1; IT1 = 1; EA = 1; PX0 = 0; PX1 = 1; while(1) { if(Flag == 1){Num = TH1<<8|TL1; if(Num < 99)Num = 99; array[0] = Num/10; array[1] = Num%10;} //显示标志位为1显示数值 Display(); //显示 } } //外部中断0 void EX0_IT0(void) interrupt 0 { //启动停止定时器0 显示标志位置1 TR0 = ~TR0; Flag = 1; } //定时器0中断函数 void ET0_T0(void) interrupt 1 { static uchar i = 0; //定时器初值 TH0 = (65536 - 50000)>>8; TL0 = (65536 - 50000)&0xff; //1S时间到 输出波形 if(++i == 20) { i = 0; LED = ~LED; } } //外部中断1 void EX1_IT1(void) interrupt 2 { //启动停止定时器1 显示标志位置1 TR1 = ~TR1; Flag = 1; }