51单片机矩阵键盘检测源代码(按键数码管显示0-F)-EDA365

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51单片机矩阵键盘检测源代码(按键数码管显示0-F)

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本程序所用的原理图下载: 点这里，单片机芯片使用的stc89c52；找到相应部分即可.这是一整个单片机开发板的电路图其他的忽略.
hex文件及其工程文件下载：http://www.51hei.com/f/juzhen.rar 以下是通过测试的源代码：
/*
*功能：使用矩阵按键使得按键按下时数码管上显示各自对应的数字（0 ~ F）；
*日期：2013-05-03-17:51;
*作者：徐冉
*特别说明：本程序代码已经通过调试，仅供学习使用；
*
*/
/***********AT89C52-RC 单片机51hei 实验板***********/
/*****************51hei-开发板*********************/
#include
typedef unsigned int uint;
typedef unsigned char uchar;
sbit wela = P2^7;
sbit dula = P2^6;
sbit FM = P2^3;
uchar code table[] = {
    0x3F, //"0"
                0x06, //"1"
                0x5B, //"2"
                0x4F, //"3"
                0x66, //"4"
                0x6D, //"5"
                0x7D, //"6"
                0x07, //"7"
                0x7F, //"8"
                0x6F, //"9"
                0x77, //"A"
                0x7C, //"B"
                0x39, //"C"
                0x5E, //"D"
                0x79, //"E"
                0x71, //"F"
                0x76, //"H"
                0x38, //"L"
                0x37, //"n"
                0x3E, //"u"
                0x73, //"P"
                0x5C, //"o"
                0x40, //"-"
                0x00, //熄灭
                0x00 //自定义
};
uchar key, temp;
void display(uchar num);
void Marix_keyscan();
void delay(uint xms);
void main()
{
dula = 1;
P0 = 0x00;
dula = 0;
wela = 1;
P0 = 0xea;
wela = 0;
while(1)
{
Marix_keyscan();
display(key);
}
}
void display(uchar num)
{
dula = 1;
P0 = table[num];
dula = 0;
}
void delay(uint xms)
{
uint i, j;
for(i = xms; i > 0; i--)
   for(j = 125; j > 0; j--);
}
void Marix_keyscan()
{
P3 = 0xfe;
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5);
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
   FM = 0;
   temp = P3;
   switch(temp)
   {
    case 0xee: key = 0;
    break;
    case 0xde: key = 1;
    break;
    case 0xbe: key = 2;
    break;
    case 0x7e: key = 3;
    break;
    default:
    break;
   }
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   delay(5);
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   FM = 1;
}
}
P3 = 0xfd;
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5);
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
   FM = 0;
   temp = P3;
   switch(temp)
   {
    case 0xed:key = 4;
    break;
    case 0xdd:key = 5;
    break;
    case 0xbd:key = 6;
    break;
    case 0x7d:key = 7;
    break;
    default:
    break;
   }
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   delay(5);
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   FM = 1;
}
}
P3 = 0xfb;
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5);
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
   FM = 0;
   temp = P3;
   switch(temp)
   {
     case 0xeb: key = 8;
    break;
    case 0xdb: key = 9;
    break;
    case 0xbb: key = 10;
    break;
    case 0x7b: key = 11;
    break;
    default:
    break;
   }
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   delay(5);
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   FM = 1;
}
}
P3 = 0xf7;
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
delay(5);
temp = P3;
temp &= 0xf0;
if(temp != 0xf0)
{
   FM = 0;
   temp = P3;
   switch(temp)
   {
    case 0xe7: key = 12;
    break;
       case 0xd7: key = 13;
    break;
    case 0xb7: key = 14;
    break;
    case 0x77: key = 15;
    break;
    default:
    break;
   }
   while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   delay(5);
      while(temp != 0xf0)
   {
    temp = P3;
    temp &= 0xf0;
   }
   FM = 1;
}
}
}

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