51单片机，矩阵键盘程序源码

ID:722217 · 发表于 2020-4-4 14:15

#include "reg52.h"
typedef unsigned char u8;
typedef unsigned int u16;

sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;

#define GPIO_KEY P1
#define GPIO_DIG P0

u8 KeyValue;

u8 code smgduan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
               0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void delay(u16 i)
{
while(i--);
}

void KeyDown()
{
u8 a;
GPIO_KEY=0x0f;
if(GPIO_KEY!=0x0f)
{
      delay(1000);
      if(GPIO_KEY!=0x0f)
      {
   GPIO_KEY=0x0f;
switch(GPIO_KEY)
{
   case(0x07):KeyValue=0;break;
   case(0x0b):KeyValue=1;break;
   case(0x0d):KeyValue=2;break;
   case(0x0e):KeyValue=3;break;
      }
         GPIO_KEY=0xf0;
         switch(GPIO_KEY)
{
   case(0x70):KeyValue=KeyValue;break;
   case(0xb0):KeyValue=KeyValue+4;break;
   case(0xd0):KeyValue=KeyValue+8;break;
   case(0xe0):KeyValue=KeyValue+12;break;
      }
while((a<50)&&(GPIO_KEY!=0xf0))
{
   delay(1000);
   a++;
}
      }
}

}

void main()
{
LSA=0;
LSB=0;
LSC=0;
while(1)
{
   KeyDown();
   GPIO_DIG=smgduan[KeyValue];
}
}

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