这是我对键盘初始化的代码：
#include <reg52.h>
#include <intrins.h>
sbit PS2_CLOCK = P3^2;
sbit PS2_DATA = P1^0;
sbit LED1=P0^7;
sbit LED2=P0^6;
sbit LED3=P0^5;
sbit LED4=P0^4;
sbit LED5=P0^3;
sbit LED6=P0^1;
unsigned char mcu_char;
unsigned char mcu_char_flag;
unsigned char char_bit;
/*延时函数*/
void delay10us(unsigned char t)
{
do
{_nop_();_nop_();_nop_();_nop_();}while(--t);
}
/*单片机发送数据到PS2键盘*/
void MCU_to_PS2(unsigned char sendchar)
{
unsigned char char_bit;
unsigned char char_chk;
//关闭中断
EX0=0;
//发送起始位
PS2_CLOCK=0;
delay10us(15);//精确延时100us
PS2_DATA=0;
delay10us(1);
PS2_CLOCK=1;
//发送数据位
for(char_bit=0;char_bit<8;char_bit++)
{
while(PS2_CLOCK==1);
PS2_DATA=sendchar&0x01;
if(PS2_DATA==1) char_chk++;
sendchar>>=1;
while(PS2_CLOCK==0);
}
//发送校验位
while(PS2_CLOCK==1);
PS2_DATA=!(char_chk%2);
while(PS2_CLOCK==0);
//发送停止位
while(PS2_CLOCK==1);
PS2_CLOCK=1;
while(PS2_CLOCK==0);
//接收应答位
while(PS2_CLOCK==1);
//if(PS2_DATA==1) send_error(); 可添加应答位检测函数
while(PS2_CLOCK==0);
//开启中断
EX0=1;
}
/*单片机接收PS2键盘数据*/
void PS2_to_MCU() interrupt 0
{
EX0=0; //关外部中断0
switch(char_bit)
{
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:{mcu_char>>=1;
if(PS2_DATA) mcu_char|=0x80;
char_bit++;
break;
}
case 0:char_bit++;break; //开始位,
case 9:char_bit++;break; //校验位,可添加校验程序
case 10:{//停止位
char_bit=0;
mcu_char_flag=1;//置接收到数据标识位
//if(mcu_revchar==0xF0) F0_FLAG=1;
//else F0_FLAG=0;
break;}
default:break;
}
EX0=1;//开外部中断0
}
/*① 上电后,接收键盘上电自检通过信号0xAA,或者自检出错信号0xFC.单片机接收为0xAA则进入下一步,否则进行出错处理.
② 关LED指示,单片机发送0xED,然后接收键盘回应0xFA,接着发送0x00接收0xFA.
③ 设置机打延时和速率:单片机发送0xF3,接收0xFA,发送0x00(250 ms,2.0 cps),接收0xFA.
④ 检查LED,发送0xED,接收0xFA,发送0x07(开所有LED),接收0xFA.发送0xED,接收0xFA,发送0x00(关LED),接收0xFA.
⑤ 允许键盘,发送0xF4,接收0xFA.键盘LED改变ps2_ledchange()函数流程:发送0xED;接收0xFA;发送led_status;接收0xFA.*/
/*键盘初始化函数*/
void key_init()
{
while(mcu_char_flag==0);
if(mcu_char==0xFF)
// {LED6=0;//key_init_error();//键盘初始化失败
// mcu_char_flag=0;}
// else if(mcu_char==0xAA) {
mcu_char_flag=0;
LED3=0;
MCU_to_PS2(0xED);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0x00);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0xF3);
while(mcu_char_flag==0);
while(mcu_char!=0xFF);
mcu_char_flag=0;
MCU_to_PS2(0xFA);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0x00);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0xED);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0x07);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0xED);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0x00);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(0xF4);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
//}
}
void key_ledchange(unsigned char led_status)
{
MCU_to_PS2(0xED);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
MCU_to_PS2(led_status);
while(mcu_char_flag==0);
while(mcu_char!=0xFA);
mcu_char_flag=0;
}
void main()
{
IE=0x81;
TCON=0x01;
key_init();
key_ledchange(0x04);//启用小键盘
//读取小键盘程序
}
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