CT107D蓝桥杯板子矩阵键盘的运用 -

//#include "reg52.h" //定义51单片机特殊功能寄存器
//#include "absacc.h"
//
//unsigned char temp;
//unsigned char value;
//void delay()
//{
// unsigned char i, j;
//
// i = 108;
// j = 145;
// do
// {
// while (--j);
// } while (--i);
//}
//
//void keydown()
//{
// P3 = 0x0f;
// delay();
// temp = P3;
// if(temp != 0x0f)
// {
// switch(temp)
// {
// case 0x0e: value = 1;break;
// case 0x0d: value = 5;break;
// case 0x0b: value = 9;break;
// case 0x07: value = 13;break;
// }
// }
// P3 = 0xf0;
// delay();
// temp = P3;
// if(temp != 0xf0)
// {
// switch(temp)
// {
// case 0xe0: value += 3;break;
// case 0xd0: value += 2;break;
// case 0xb0: value += 1;break;
// case 0x70: value += 0;break;
// }
// }
// while(P3 != 0xf0);
//}
//
//int number(int x)
//{
// switch(x)
// {
// case 0:return 0xC0;break;
// case 1:return 0xF9;break;
// case 2:return 0xA4;break;
// case 3:return 0xB0;break;
// case 4:return 0x99;break;
// case 5:return 0x92;break;
// case 6:return 0x82;break;
// case 7:return 0xF8;break;
// case 8:return 0x80;break;
// case 9:return 0x90;break;
// default :return 0xF3;break;
// }
//}
//
//void main()
//{
// while(1)
// {
// keydown();
// P2 = ((P2&0x1f)|0xE0);
// P0 = 0xff;
// P2 &= 0x1f;
//
// P2 = ((P2&0x1f)|0xC0);
// P0 = 0x80;
// P2 &= 0x1f;
//
// P2 = ((P2&0x1f)|0xE0);
// P0 = number(value);
// P2 &= 0x1f;
// }
//}
#include "reg52.h" //定义51单片机特殊功能寄存器
#include "absacc.h"
sfr AUXR = 0x8E;
sfr P4 = 0xC0; //P4
sbit P42 = P4^2;
sbit P44 = P4^4;
// 0 1 2 3 4 5 6 7 8 9 熄灭
code unsigned char tab[] = { 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xFF};
unsigned char dspbuf[8] = {10,10,10,10,10,10,10,10}; //显示缓冲区
unsigned char dspcom = 0;
bit key_re;
unsigned char key_press;
unsigned char key_value;
bit key_flag = 0;
unsigned char intr = 0;
unsigned char read_keyboard(void);
void display();
//主函数
void main(void)
{
unsigned char key_temp = 0xff;
AUXR |= 0x80; //1T模式，IAP15F2K61S2单片机特殊功能寄存器
TMOD &= 0xF0;
TL0 = 0xCD;
TH0 = 0xD4;
TF0 = 0;
TR0 = 1;
ET0 = 1;
EA = 1;
while(1)
{
if(key_flag)
{
key_flag = 0;
key_temp = read_keyboard();
if(key_temp != 0xFF){
dspbuf[7] = key_temp%10;
dspbuf[6] = key_temp/10;
}
}
}
}
//定时器中断服务函数
void isr_timer_0(void) interrupt 1 //默认中断优先级 1
{
display();
if(++intr == 10) //1ms执行一次
{
intr = 0;
key_flag = 1; //10ms按键扫描标志位置1
}
}
//读取矩阵键盘键值:转接板中使用P42和P44代替8051引脚
//顺序中的P36和P37引脚
unsigned char read_keyboard(void)
{
static unsigned char col;
P3 = 0xf0; P42 = 1; P44 = 1;
if((P3 != 0xf0)||(P42 != 0)||(P44 != 0)) //有按键按下
key_press++;
else
key_press = 0; //抖动
if(key_press == 3)
{
key_press = 0;
key_re = 1;
if(P44 == 0) col = 1;
if(P42 == 0) col = 2;
if((P3 & 0x20) == 0) col = 3;
if((P3 & 0x10) == 0) col = 4;
P3 = 0x0F; P42 = 0; P44 = 0;
if((P3&0x01) == 0) key_value = (col-1);
if((P3&0x02) == 0) key_value = (col+3);
if((P3&0x04) == 0) key_value = (col+7);
if((P3&0x08) == 0) key_value = (col+11);
}
//连续三次检测到按键被按下，并且该按键已经释放
P3 = 0x0f; P42 = 0; P44 = 0;
if(((key_re == 1) && (P3 == 0x0f))&&(P42 == 0)&&(P44 == 0))
{
key_re = 0;
return key_value;
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