设计基于STC15F2K60S2单片机的串行通信,通过四行三列矩阵键盘作为输入设备,实时扫描按键按下情况,经键盘扫描程序进行处理,输出相应的键值并送入串行口1数据发送缓冲器,等待一帧数据发送完成。运用串行口1中断,读取串口1接收数据缓冲器内的数据,经过接收数据处理程序的处理,将不同数据接收的次数转换为BCD码,并和本次接收的数据一同送数码管显示,达到双机通信并显示的目的。系统硬件包括单片机串行通信模块、矩阵式按键模块、数码管显示模块等三部分。
制作出来的实物图如下:
电路原理图如下:
单片机源程序如下:
- #include<reg51.h>
- #include<intrins.h>
- #define uchar unsigned char
- #define uint unsigned int
- #define led_data P0
- #define led_bit P1
- #define KEY P2
- uchar k = 10;
- uchar m = 10;
- uchar n = 10;
- uchar r_data = 10;
- uchar code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00}; //共阴极字形码{0,1,2,3,4,5,6,7,8,9,不显示}
- uchar code key_code[] = {0x57,0x6e,0x5e,0x3e,0x6d,0x5d,0x3d,0x6b,0x5b,0x3b}; //键码{[4,2];[1,1];[1,2],[1,3];[2,1];[2,2];[2,3];[3,1];[3,2];[3,3]}
- uchar code scan_con[4] = {0x0E,0x0D,0x0B,0x07}; //位扫描字{1,2,3,4}
- /*-----------------------------------------------1ms延时子函数-----------------------------------------------------*/
- void delay1ms(int t)
- {
- int i,j;
- for (i = 0;i < t;i++)
- for (j = 0;j < 120;j++);
- }
- /*---------------------------------------------键盘扫描发送子函数--------------------------------------------------*/
- uchar keyscan()
- {
- uchar X,Y,Z;
- uchar k;
- KEY = 0x7f;
- KEY = 0x0f; //列扫描输出全 “0”
- if(KEY != 0x0f) //判断是否有键按下
- {
- delay1ms(130); //软件延时去干扰
- if(KEY != 0x0f) //确认按键按下
- {
- X = KEY; //保存列扫描时有键按下的状态(列扫描键码)
- KEY = 0x70; //行扫描输出全 “0”
- Y = KEY; //保存行扫描时有键按下的状态(行扫描键码)
- Z = X | Y; //键码=列扫描键码+行扫描键码(按位相与)
- for(k = 0;k <= 9;k++)
- {
- if(Z == key_code[k]) //查表得键值
- {
- SBUF = k; //将键值送入发送缓冲器
- while(TI == 0); //等待发送过程结束
- TI = 0; //发送中断标志位清零
- }
- }
- }
- }
- else KEY = 0x7f; //恢复扫描线为输入状态
- return(10);
- }
- /*--------------------------------------------串行口1中断接收函数--------------------------------------------------*/
- void Serial_ISR(void) interrupt 4
- {
- uint a,b,c,d,e,f,g,h,i,j,num; //定义0-9各数字接收次数变量和BCD运算变量
- if(RI == 1) //判断是否为接收中断
- {
- r_data = SBUF; //保存接收到的数据
- RI = 0; //接收中断标志位清零
- switch(r_data) //分析所接收到的数据
- {
- case 0x00:++a;num = a;break;
- case 0x01:++b;num = b;break;
- case 0x02:++c;num = c;break;
- case 0x03:++d;num = d;break;
- case 0x04:++e;num = e;break;
- case 0x05:++f;num = f;break;
- case 0x06:++g;num = g;break;
- case 0x07:++h;num = h;break;
- case 0x08:++i;num = i;break;
- case 0x09:++j;num = j;break;
- default:num = num;
- }
- if(num <= 9) //一位十进制数的BCD码
- {
- k = 10;
- m = 10;
- n = num;
- }
- else if(num <= 99) //两位十进制数的BCD码
- {
- k = 10;
- m = num / 10;
- n = num % 10;
- }
- else //三位十进制数的BCD码
- {
- k = num / 100;
- m = (num - k * 100) / 10;
- n = num % 10;
- }
- }
- }
- /*----------------------------------------------数码管显示子函数---------------------------------------------------*/
- display()
- {
- led_bit = scan_con[0]; //送位选码
- led_data = table[r_data]; //送段码
- delay1ms(1);
- led_bit = scan_con[1];
- led_data = table[k];
- delay1ms(1);
- led_bit = scan_con[2];
- led_data = table[m];
- delay1ms(1);
- led_bit = scan_con[3];
- led_data = table[n];
- delay1ms(1);
- return(0);
- }
- /*---------------------------------------------------主函数--------------------------------------------------------*/
- void main(void)
- {
- TMOD = 0x20; //实用定时器T1方式2(8位自动重装初值)
- TH1 = 0xf4; //244
- TL1 = 0xf4; //波特率为2400
- TR1 = 1; //启动定时器T1
- SCON = 0x40; //设定串行口1为方式1
- REN = 1; //允许串行口1接受数据
- ES = 1; //开放串行口1中断
- EA = 1; //开放总中断
- while(1)
- {
- keyscan(); //执行键盘扫描程序
- display(); //执行数码管显示程序
- }
- }
复制代码
原理图和以上程序下载:
原理图及程序.7z
(26.63 KB, 下载次数: 4)
|