网站开发工具可视化/晋城网站seo

附注：
原理图各接口连接关系可参考代码中的端口定义；
P0口数据锁存器为两片74HC573芯片；
1.对独立键盘的检测

/*--------------------------
功能：用数码管实现60s计时器
上电时，数码管显示00
key4控制开始/暂停计时
暂停状态下，key1进行加1操作
key2进行减1操作
key3进行清零操作
---------------------------
Author: Zhang Kaizhou
Date: 2019-5-19 19:14:20
--------------------------*/
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned intsbit key1 = P3^4;
sbit key2 = P3^5;
sbit key3 = P3^6;
sbit key4 = P3^7;
sbit wei_address = P2^7;
sbit duan_address = P2^6;
uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f,0x66, 0x6d, 0x7d, 0x07,0x7f, 0x6f, 0x77, 0x7c,0x39, 0x5e, 0x79, 0x71}; // 定义一个无符号字符型数组table[]，存放在单片机内部的ROM或Flash中uchar n1 = 0, n2 = 0;							void init();
void display(uchar num);
void keyScan();	
void delay(uchar xms);											void main()
{init();while(1){keyScan();display(n1);}
}/*初始化函数*/
void init()
{TMOD = 0x01; // 定时器0，方式1TH0 = (65536 - 45872) / 256; // 定时50msTL0 = (65536 - 45872) % 256;EA = 1; // 开全局中断ET0 = 1; // 开定时器0溢出中断
}/*定时器0中断服务程序*/
void T0_interrupt() interrupt 1
{TH0 = (65536 - 45872) / 256; // 定时器0重装初值TL0 = (65536 - 45872) % 256;n2++;if(n2 == 20) // 定时到1s{n2 = 0;n1++;if(n1 == 60){n1 = 0;}}
}/*数码管显示函数*/
void display(uchar num)
{uchar shi, ge;shi = num / 10;ge = num % 10;duan_address = 1; // 在数码管上显示十位的数字P0 = table[shi];duan_address = 0;P0 = 0xff;wei_address = 1;P0 = 0xfe;wei_address = 0;delay(5);duan_address = 1; // 在数码管上显示个位的数字P0 = table[ge];duan_address = 0;P0 = 0xff;wei_address = 1;P0 = 0xfd;wei_address = 0;delay(5);
}/*键盘扫描函数*/
void keyScan()
{if(!key1) // key1按下，加1{delay(10);if(!key1) {n1++;if(n1 == 60){n1 = 0;}while(!key1);}}if(!key2) // key2按下，减1{delay(10);if(!key2) {if(!n1){n1 = 60;				}n1--;while(!key2);}}if(!key3) // key4按下，暂停或开始定时器0{delay(10);if(!key3) {n1 = 0;while(!key3);}}if(!key4){delay(10);if(!key4){while(!key4);TR0 = ~TR0;}}
}/*延时函数*/
void delay(uchar xms)
{uchar i, j;for(i = 0; i < xms; i++)for(j = 0; j < 110; j++);
}

2.对矩阵键盘进行扫描

/*------------------------
功能：扫描4x4矩阵键盘
Author: Zhang Kaizhou
Date: 2019-5-21 21:37:31
-------------------------*/
#include <reg52.h>
#define uchar unsigned charsbit wei_address = P2^7;
sbit duan_address = P2^6;uchar code table[] = {0x3f, 0x06, 0x5b, 0x4f,0x66, 0x6d, 0x7d, 0x07,0x7f, 0x6f, 0x77, 0x7c,0x39, 0x5e, 0x79, 0x71}; // 定义一个无符号字符型数组table[]，存放在单片机内部的ROM或Flash中uchar buffer, key;											void init_digitron();											
void array_scan_oneline(uchar address);											
void array_scan();	
void display(uchar key);											
void delay(uchar xms);											void main()
{init_digitron(); // 初始化数码管while(1) // 循环逐行扫描按键是否按下{array_scan();}
}/*数码管初始化函数*/
void init_digitron()
{P0 = 0; // 关闭所有数码管duan_address = 1;duan_address = 0;P0 = 0x00; // 选中所有数码管wei_address = 1;wei_address = 0;
}/*矩阵键盘扫描函数*/
void array_scan()
{array_scan_oneline(0xfe);array_scan_oneline(0xfd);array_scan_oneline(0xfb);array_scan_oneline(0xf7);
}/*矩阵键盘扫描一行的函数*/
void array_scan_oneline(uchar address)
{P3 = address;buffer = P3;buffer = buffer & 0xf0;if(buffer != 0xf0) // 有键按下{delay(10); // 消抖buffer = P3;buffer = buffer & 0xf0;if(buffer != 0xf0){buffer = P3;switch(buffer){case 0xee: key = 0; break;case 0xde: key = 1; break;case 0xbe: key = 2; break;case 0x7e: key = 3; break;case 0xed: key = 4; break;case 0xdd: key = 5; break;case 0xbd: key = 6; break;case 0x7d: key = 7; break;case 0xeb: key = 8; break;case 0xdb: key = 9; break;case 0xbb: key = 10; break;case 0x7b: key = 11; break;case 0xe7: key = 12; break;case 0xd7: key = 13; break;case 0xb7: key = 14; break;case 0x77: key = 15; break;}while(buffer != 0xf0) // 等待按键释放{buffer = P3;buffer = buffer & 0xf0;}display(key);}}
}/*延时函数*/
void delay(uchar xms)
{uchar i, j;for(i = 0; i < xms; i++)for(j = 0; j < 110; j++);
}/*数码管显示函数*/
void display(uchar key)
{P0 = table[key];duan_address = 1;duan_address = 0;
}