原创 PS/2 键盘与单片机

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PS/2 键盘与单片机接口

用LCD1602显示

调试成功所以拿出来给大家分享，希望对大家有用，呵呵^_^

用PS/2键盘做系统输入部分蛮方便的哦！

可以使用Backspace/Esc/Tab/Caps Lock/Shift/Enter/Space/Arrow等按键

这是键盘通码：

/*--------------------------------------------------------------*/
//File: 鼠标液晶测试
//Date: 2009-4-19
//Time: 16:30

/*--------------------------------------------------------------*/
#include <reg52.h>
#include "PS_keyboard.H"
#include "LCD1602_8A.H"

/*--------------------------------------------------------------*/
//延时50ms 函数定义
void delay50ms(void)
{
    unsigned char i, j;
    for(i = 165; i > 0; i--)
    for(j = 150; j > 0; j--);
}

/*--------------------------------------------------------------*/
//主函数
void main(void)
{
 unsigned char x, y;

 LCD_init();     //LCD1602初始化
 keyboard_init();   //键盘初始化

 while(1)
 {
  if(r_ok == 2)
  {  
   if(keyboard_data == 0x29) LCD_printc(x++, y, ' ');    //空格
   else if(keyboard_data == 0x66) {LCD_printc(x = (--x & 0x0f), y, ' '); LCD_pos(x, y);}//退格
   else if(keyboard_data == 0x0d) LCD_pos(x+=4, y);    //制表
   else if(keyboard_data == 0x5a) LCD_pos(x = 0, y = (++y & 0x01));//回车
   else if(keyboard_data == 0x58) shift_flag = ~ shift_flag;  //大小写切换
   else if(keyboard_data == 0x76) {LCD_clr();LCD_pos(x=0, y="0");} //清屏,光标复位
   else if(keyboard_data == 0x6b) LCD_pos(x = (--x & 0x0f), y); //光标左移
   else if(keyboard_data == 0x74) LCD_pos(x = (++x & 0x0f), y); //光标右移
   else if(keyboard_data == 0x75) LCD_pos(x, y = (--y & 0x01)); //光标上移
   else if(keyboard_data == 0x72) LCD_pos(x, y = (++y & 0x01)); //光标下移

   else             //字符输出
   {
    look_ascii();          //查表
    LCD_printc(x & 0x0f, y & 0x01, keyboard_ascii);  
    if(y > 1) {y = 0; LCD_clr(); x--;}     //清屏
    x++; if(x > 15) {x = 0; y++;}      //换行
   }
    
   r_ok = 0;   //清接收标志位
   EX0 = 1;   //继续检测按键
  }
  delay50ms();
 }
}

/*--------------------------------------------------------------*/
//ASCII
unsigned char code KB_ASCII[48][3] = {
//unshifted, shifted, scan_code
'`', '~', 0x0E,
'1', '!', 0x16,
'2', '@', 0x1E,
'3', '#', 0x26,
'4', '$', 0x25,
'5', '%', 0x2E,
'6', '^', 0x36,
'7', '&', 0x3D,
'8', '*', 0x3E,
'9', '(', 0x46,
'0', ')', 0x45,
'-', '_', 0x4E,
'=', '+', 0x55,

'q', 'Q', 0x15,
'w', 'W', 0x1D,
'e', 'E', 0x24,
'r', 'R', 0x2D,
't', 'T', 0x2C,
'y', 'Y', 0x35,
'u', 'U', 0x3C,
'i', 'I', 0x43,
'o', 'O', 0x44,
'p', 'P', 0x4D,
'[', '{', 0x54,
']', '}', 0x5B,
'\\', '|',0x5D,

'a', 'A', 0x1C,
's', 'S', 0x1B,
'd', 'D', 0x23,
'f', 'F', 0x2B,
'g', 'G', 0x34,
'h', 'H', 0x33,
'j', 'J', 0x3B,
'k', 'K', 0x42,
'l', 'L', 0x4B,
';', ':', 0x4C,
'\'', '"',0x52,

'z', 'Z', 0x1A,
'x', 'X', 0x22,
'c', 'C', 0x21,
'v', 'V', 0x2A,
'b', 'B', 0x32,
'n', 'N', 0x31,
'm', 'M', 0x3A,
',', '<', 0x41,
'.', '>', 0x49,
'/', '?', 0x4A
};

/*--------------------------------------------------------------*/
//File: PS/2-keyboard头文件
//Date: 2009-4-18
//Time: 21:29

/*--------------------------------------------------------------*/
//防止被重复定义引用
#ifndef __PS_keyboard_H__
#define __PS_keyboard_H__
//包含头文件
#include "LCD_ASCII.H"   //键盘通码表

/*--------------------------------------------------------------*/
sbit keyboard_sda = P1^6;  //鼠标数据线
sbit keyboard_clk = P3^2;  //鼠标时钟线
sbit led    = P0^0;  //按键LED指示
sbit beep    = P0^1;  //蜂鸣器指示

/*--------------------------------------------------------------*/
//数据定义
unsigned char n;    //循环变量
unsigned int  keyboard_word; //接收字16bits
unsigned char keyboard_data; //接收字节
unsigned char keyboard_ascii; //查表得到的字符
bit shift_flag;     //shift标志位
unsigned char r_ok;    //接收数据有效

/*--------------------------------------------------------------*/
//函数声明
void INT0_init(void);      //外部中断INT0初始化
//void delay120us(void);      //延时120us 函数定义
//void keyboard_write_dat(unsigned char dat); //发送数据
void keyboard_read_dat(void);    //读出数据
void keyboard_init(void);     //键盘初始化
void look_ascii(void);      //查表字符

/*--------------------------------------------------------------*/
//外部中断INT0初始化
void INT0_init(void) 
{
    EA  = 1;   //总中断
 EX0 = 1;   //外部中断
 PX0 = 1;   //中断优先级
 IT0 = 0;   //低电平触发
}

/*--------------------------------------------------------------*/
//延时120us 函数定义
/*void delay120us(void)
{
    unsigned char i, j;
    for(i = 23; i > 0; i--)
    for(j = 1; j > 0; j--);
}

/*--------------------------------------------------------------*/
//奇校验
bit check_parity(void)
{ 
 ACC = keyboard_data;
 if(~P == (bit)(keyboard_word & 0x0200)) return 1; //奇校验成功则返回1
 else          return 0; //奇校验失败则返回0
}

/*--------------------------------------------------------------*/
//读出字节数据
void keyboard_read_dat(void)
{
 keyboard_data = (unsigned char)(keyboard_word >> 1);//去掉最高两位和最后一位
 if(check_parity()) keyboard_word = 0;    //奇校验成功//清接收数据字
 else    keyboard_data = 0;    //置零
 if(keyboard_data == 0xe0 | keyboard_data == 0xf0){;}//忽略0xe0和0xf0字节
 else 
  if(keyboard_data == 0x12 | keyboard_data == 0x59) shift_flag = ~shift_flag;//shift按键检测
  else {r_ok++; if(r_ok == 2) EX0 = 0;}  //忽略通码，取断码，接收有效，断开中断，按键处理
}

/*--------------------------------------------------------------*/
//查表字符
void look_ascii(void)
{
 unsigned char i;
 for(i = 0; i < 48; i++)
 {
  if(KB_ASCII[2] == keyboard_data)    //查找按键通码
  {
   keyboard_ascii = KB_ASCII[shift_flag]; //得到相应字符
  }
 }
}