#include #define uchar unsigned char #define uint unsigned int #define ulong unsigned long #define LED_DAT P0 sbit LED_SEG0 = P2^7; sbit LED_SEG1 = P2^6; sbit LED_SEG2 = P2^5; sbit LED_SEG3 = P2^4; #define TIME_CYLC 100 //12M晶振，定时器10ms 中断一次 我们1秒计算一次转速 // 1000ms/10ms = 100 #define PLUS_PER 10 //码盘的齿数 ，这里假定码盘上有10个齿，即传感器检测到10个脉冲，认为1圈 #define K 1.65 //校准系数 unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar data Disbuf[4];// 显示缓冲区 uint Tcounter = 0; //时间计数器 bit Flag_Fresh = 0; // 刷新标志 bit Flag_clac = 0; //计算转速标志 bit Flag_Err = 0; //超量程标志 void DisplayFresh();//在数码管上显示一个四位数 void ClacSpeed();//计算转速，并把结果放入数码管缓冲区 void init_timer();//初始化定时器T0\T1 void Delay(uint ms);//延时函数 void it_timer0() interrupt 1 /* interrupt address is 0x000b */ { TF0 = 0; //定时器 T0用于数码管的动态刷新 TH0 = 0xC0; TL0 = 0x00; Flag_Fresh = 1; Tcounter++; if(Tcounter>TIME_CYLC) { Flag_clac = 1;//周期到，该重新计算转速了 } } void it_timer1() interrupt 3 /* interrupt address is 0x001b */ { TF1 = 0; //定时器T1用于单位时间内收到的脉冲数 //要速度不是很快，T1永远不会益处 Flag_Err = 1; //如果速度很高，我们应考虑另外一种测速方法：T测速法 } void main(void) { Disbuf[0] = 0; //开机时，初始化为0000 Disbuf[1] = 0; Disbuf[2] = 0; Disbuf[3] = 0; init_timer(); while(1) { if(Flag_Fresh) { Flag_Fresh = 0; DisplayFresh(); // 定时刷新数码管显示 } if(Flag_clac) { Flag_clac = 0; ClacSpeed(); //计算转速，并把结果放入数码管缓冲区 Tcounter = 0;//周期定时 清零 TH1=TL1 = 0x00;//脉冲计数清零 } if(Flag_Err) //超量程处理 { Disbuf[0] = 0x9e; //开机时，初始化为0000 Disbuf[1] = 0x9e; Disbuf[2] = 0x9e; Disbuf[3] = 0x9e; while(1) { DisplayFresh();//不再测速 等待复位i } } } } //在数码管上显示一个四位数 void DisplayFresh() { P2 |= 0xF0; LED_SEG0 = 0; LED_DAT = table[Disbuf[0]]; Delay(1); P2 |= 0xF0; LED_SEG1 = 0; LED_DAT = table[Disbuf[1]]; Delay(1); P2 |= 0xF0; LED_SEG2 = 0; LED_DAT = table[Disbuf[2]]; Delay(1); P2 |= 0xF0; LED_SEG3 = 0; LED_DAT = table[Disbuf[3]]; Delay(1); P2 |= 0xF0; } //计算转速，并