单片机可预设电压的数控电源程序

#ifndef _PWLOCK_H // 防止PWLock.h被重复引用#define _PWLOCK_H#include <reg52.h>#include <absacc.h>#include <stdio.h>#include <math.h>#define uchar unsigned char#define uint unsigned intuchar px;uint a;uint b;uint c; //为0XFFuint i;uchar digbit; // 字位uchar dy;uchar wordbuf[2]; // 字型码缓冲区uchar count; // 位计数uchar pwbuf[2]; // 输入数字存储区bit enterflag; // 确认键按下与否标志bit lh;bit pwflag; // 密码正确与否标志bit showflag; // 数码管显示与否标志sbit P20=P2^0;sbit P21=P2^1;void display(void); // 显示函数#endif//#include "PWLock.h"/* 键消抖延时函数*/void delay(void){uint i;for (i=4000;i>0;i--);}/* 键扫描函数*/uchar keyscan(void){uchar scancode,tmpcode;P1 = 0xf0; // 发全0行扫描码if ((P1&0xf0)!=0xf0) // 若有键按下{delay(); // 延时去抖动if ((P1&0xf0)!=0xf0) // 延时后再判断一次，去除抖动影响{scancode = 0xfe;while((scancode&0x10)!=0) // 逐行扫描{P1 = scancode; // 输出行扫描码if ((P1&0xf0)!=0xf0) // 本行有键按下{tmpcode = (P1&0xf0)|0x0f;/* 返回特征字节码，为1的位即对应于行和列*/return((~scancode)+(~tmpcode));}else scancode = (scancode<<1)|0x01; // 行扫描码左移一位}}}return(0); // 无键按下，返回值为0}/* 定时器0中断服务子程序，2ms定时动态扫描显示*/void time0_int(void) interrupt 1{/* 重置2ms定时*/TH0 = -2000/256;TL0 = -2000%256;px++; //片选if (showflag==1)display(); // 调用显示函数}/* 根据共阴极字型编码表获取0~9，A~B字型代码*/uchar getcode(uchar i){uchar p;switch (i){case 0: p=0x3f; break; /* 0 */case 1: p=0x06; break; /* 1 */case 2: p=0x5B; break; /* 2 */case 3: p=0x4F; break; /* 3 */case 4: p=0x66; break; /* 4 */case 5: p=0x6D; break; /* 5 */case 6: p=0x7D; break; /* 6 */case 7: p=0x07; break; /* 7 */case 8: p=0x7F; break; /* 8 */case 9: p=0x67; break; /* 9 */default: break;}return(p);}void Display(void) //LED数值显示{switch (px%2){case 0:P20 = 1;P21 = 0; P0 = getcode(wordbuf[0]);break; case 1:P21 = 1;P20 = 0; P0 = getcode(wordbuf[1]);break; default: return;}}/* 显示函数*//*void display(void){uchar i;switch (digbit){case 1: i=0; break;case 2: i=1; break;default: break;}P2 = 0x0; // 关闭显示// P20=0;// P21=0;P0 = getcode(wordbuf[i]); // 送字型码P2=digbit; // 送字位码digbit=1;if(digbit==1){digbit=2;P20 = 1;P21 = 0;}digbit=2;P21 = 1;P20 = 0;if (digbit<0x02) // 共2位digbit = digbit*2; // 左移一位elsedigbit = 0x01;}*//* 主程序*/void main(){uchar j,key;uint temp;P20 = 1;P21 = 1; // 关闭数码管显示TMOD = 0x11; // T0，T1工作方式1/* 2ms 定时设置*/TH0 = -2000/256;TL0 = 2000%256;/* 启动计数器0，关闭计数器1 */TR0 = 1;ET0 = 1;TR1 = 0;ET1 = 1;EA = 1;count = 0; // 初始计数器设为0enterflag = 0; // 没有按下确认键lh = 0;pwflag = 0; // 标志先置为0digbit = 0x01; // 从第一位数码管开始动态扫描/* 刚加电时，bu显示*/for (j=0;j<2;j++)wordbuf[j] = 17;showflag = 1; // 打开数码管显while(1){key = keyscan(); // 调用键盘扫描函数switch(key){case 0x11: // 1行1列，数字1 if (count<2){wordbuf[count] = 1; // 对应位上显示“1”pwbuf[count] = 1;if(count==0){a=1;}if(count==1){b=1;}count++;}break;case 0x21: // 1行2列，数字3 if (count<2){wordbuf[count] = 2; // 对应位上显示“2"pwbuf[count] = 2;if(count==0){a=2;}if(count==1){b=2;}count++;}break;case 0x41: // 1行3列，数字3 if (count<2){wordbuf[count] = 3; // 对应位上显示“3"pwbuf[count] = 3;if(count==0){a=3;}if(count==1){b=3;}count++;}break;case 0x12: // 2行1列，数字4 if (count<2){wordbuf[count] = 4; // 对应位上显示“4"pwbuf[count] = 4;if(count==0){a=4;}if(count==1){b=4;}count++;}break;case 0x22: // 2行2列，数字5 if (count<2){wordbuf[count] = 5; // 对应位上显示“5"pwbuf[count] = 5;if(count==0){a=5;}if(count==1){b=5;}count++;}break;case 0x42: // 2行3列，数字6if (count<2){wordbuf[count] = 6; // 对应位上显示“6"pwbuf[count] = 6;if(count==0){a=6;}if(count==1){b=6;}count++;}break;case 0x14: // 3行1列，数字7 if (count<2){wordbuf[count] = 7; // 对应位上显示“7"pwbuf[count] = 7;if(count==0){a=7;}if(count==1){b=7;}count++;}break;case 0x24: // 3行2列，数字8 if (count<2){wordbuf[count] = 8; // 对应位上显示“8"pwbuf[count] = 8;if(count==0){a=8;}if(count==1){b=8;}count++;}break;case 0x44: // 3行3列，数字9 if (count<2){wordbuf[count] = 9; // 对应位上显示“9"pwbuf[count] = 9;if(count==0){a=9;}if(count==1){b=9;}count++;}break;case 0x18: // 4行1列，数字*count = 0;P3=0;px=0; // 显示清零for (j=0;j<2;j++){wordbuf[j] = 17; // 数码管不显示pwbuf[j] = 0; // 用FFFFFF清除已经输入的密码}break;case 0x28: // 4行2列，数字0if (count<2){wordbuf[count] = 0; // 对应位上显示“0"pwbuf[count] = 0;if(count==0){a=0;}if(count==1){b=0;}count++;}break;case 0x48: // 4行3列，数字#enterflag = 1; // 确认键按下if (count==2) // 只有输入2个数后按确认键才有效输出pwflag = 1;break;default:break;}if (enterflag==1) // 如果按下确认键{enterflag = 0; // 标志位置回0count = 0; // 计数器清零c=0xff/6;if (pwflag==1){P3=a*c+b*c/10+12*c/100;temp=a*c+b*c/10+12*c/100;if(temp>=0xff){P3=0xff;}}}}}。