key.c

键盘扫描输入

#include "reg52.h"
#include "absacc.h"

#define uchar unsigned char
#define word unsigned int
#define LedKey  XBYTE[0x4000]

uchar code KeyVal[] =
{
  '.', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '*', '<', '>', 13, 27
};

//uchar LedKeyData;

void Delay_Ms(uchar x) //
{
    uchar i;
    word j;
    for (i = 0; i < x; i++)
    {
        for (j = 0; j < 333; j++)
            ;
    }
}

uchar ReadKey()
{
    uchar row, res, col;

    for (row = 0; row < 4; row++)
    {
        LedKeyData &= 0xf0;
        LedKeyData |= ~(1 << row);
        LedKey = LedKeyData;
        res = (~P1) & 0xf;
        if (res)
        {
            break;
        }
    }

    if (row == 4)
    {
        return 0;
    }

    col = (res >> 1);
    if (col == 4)
    {
        col = 3;
    }

    Delay_Ms(80);
    return KeyVal[(row << 2) + col];
}

//
uchar inputs(uchar *s, uchar x, uchar y, bit hide)
{
    uchar i = 0;
    uchar c;

    ShowChar(x, y, ' ', 0);
    Delay_Ms(500);
    ShowChar(x, y, '_', 0);

    ShowRow(y);
    while (1)
    {
        c = 0;
        while (!c)
        {
            c = ReadKey();
        }
        switch (c)
        {
          case '<':
            if (i > 0)
            {
                i--;
                ShowChar(x + i * 6, y, ' ', 0);
                ShowRow(y);
            }
            break;
          case '*':
            LedKeyData ^= 0x10;
            LedKey = LedKeyData;
            break;
          case '>':
            break;
          case 13:
            s[i] = 0;
            return (1);
          case 27:
            s[0] = 0;
            return 0;
          default:
            if (i < 10)
            {
                if (hide)
                {
                    ShowChar(x + i * 6, y, '*', 0);
                }
                else
                {
                    ShowChar(x + i * 6, y, c, 0);
                }
                s[i] = c;
                i++;
            }
            ShowRow(y);
            break;
        }
    }
}

//
uchar selectN(uchar n)
{
    uchar i, c, cn;
    SelectMenuItem(1);
    i = 0;
    c = 0;
    while (c != Cancle)
    {
        c = ReadKey();

        if (c != 0)
        {
            cn = c - '0';
            SelectMenuItem(i + 1);
            if (c == '<')
            {
                i--;
            }
            else if (c == '>')
            {
                i++;
            }
            else if ((cn <= n) && (cn > 0))
            {
                i = cn - 1;
            }
            i = i % n;
            SelectMenuItem(i + 1);
            if (c == Enter)
            {
                return i;
            }
            else if (c == Cancle)
            {
                return 0;
            }
        }
    }
}