51 单片机 C 语言编程：矩阵键盘输入，显示在数码管 -

通过矩阵键盘输入，并显示在一位数码管上。

本文引用地址: http://www.21ic.com/app/mcu/201806/764386.htm

#include

#define uint unsigned int

#define uchar unsigned char

sbit duanx = P2^6;

sbit weix = P2^7;

uchar key, k_tmp, view;

uchar show[] = {

0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40};

void keyscan(void)

{

key = 16;

P3 = 0xf0; k_tmp = P3 & 0xf0;

if (k_tmp == 0x70) key = 0;

else if(k_tmp == 0xb0) key = 1;

else if(k_tmp == 0xd0) key = 2;

else if(k_tmp == 0xe0) key = 3;

P3 = 0x0f; k_tmp = P3 & 0x0f;

if (k_tmp == 0x07) key = key + 12;

else if(k_tmp == 0x0b) key = key + 8;

else if(k_tmp == 0x0d) key = key + 4;

else if(k_tmp == 0x0e) key = key + 0;

view = show[key];

}

void display(uchar view)

{

P0 = view; duanx = 1; duanx = 0;

P0 = 0xfe; weix = 1; weix = 0;

}

main()

{

while(1) {

keyscan();

display(view);

}

}