51单片机通过矩阵键盘完成数值的输入，已经学会以为了，怎么变成多位
#include<reg52.h>
#include<reg51.h>
#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);
}
}
