本帖最后由 木丁西 于 2014-6-2 23:27 编辑
#include <reg52.h>
void KeyDriver();
sbit KEY_IN_4 = P2^7;
sbit KEY_IN_3 = P2^6;
sbit KEY_IN_2 = P2^5;
sbit KEY_IN_1 = P2^4;
sbit KEY_OUT_1 = P2^3;
sbit KEY_OUT_2 = P2^2;
sbit KEY_OUT_3 = P2^1;
sbit KEY_OUT_4 = P2^0;
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
unsigned char code KeyCodeMap[4][4] = { //矩阵按键编号到标准键盘键码的映射表
{ 0x31, 0x32, 0x33, 0x26 }, //数字键1、数字键2、数字键3、向上键
{ 0x34, 0x35, 0x36, 0x25 }, //数字键4、数字键5、数字键6、向左键
{ 0x37, 0x38, 0x39, 0x28 }, //数字键7、数字键8、数字键9、向下键
{ 0x30, 0x1B, 0x0D, 0x27 }} ; //数字键0、ESC键、 回车键、向右键
unsigned char Ledbuffer[6] = {
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char code LedChar[]={
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
unsigned char keystate[4][4] ={{1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}};
void main()
{
ADDR3 = 1;
ENLED = 0;
EA = 1;
TMOD = 0X01;
TH0 = 0XFC;
TL0 = 0X67;
ET0 = 1;
TR0 = 1;
Ledbuffer[0] = LedChar[0];
while(1)
{
KeyDriver();
}
}
void ShowNumber(unsigned long num)
{
signed char buffer[6];
unsigned char i;
for(i=0; i<=5; i++)
{
buffer
= num%10;
num = num/10;
}
for(i=5; i>=1; i--)
{
if(buffer == 0)
{
Ledbuffer = 0xff;
}
else
break;
}
for(; i>=0; i--)
{
Ledbuffer = LedChar[buffer];
}
}
void KeyAction(unsigned char keycode)
{
static unsigned long result = 0;
static unsigned long addend = 0;
if((keycode >= 0x30) && (keycode <= 0x39))
{
addend = (addend*10) + (keycode - 0x30);
ShowNumber(addend);
}
else if(keycode == 0x26)
{
result += addend;
addend = 0;
ShowNumber(result);
}
else if(keycode == 0x0D)
{
result += addend;
addend = 0;
ShowNumber(result);
}
else if(keycode == 0x1B)
{
addend = 0;
result = 0;
ShowNumber(addend);
}
}
void KeyDriver()
{
unsigned char i, j;
static unsigned char backup[4][4] = {{1,1,1,1},{1,1,1,1},{1,1,1,1},{1,1,1,1}};
for(i=0; i<4; i++)
{
for(j=0; j<4; j++)
{
if(backup[j] != keystate[j])
{
if(backup[j] == 0)
{
KeyAction(KeyCodeMap[j]);
}
backup[j] = keystate[j];
}
}
}
}
void LedScan()
{
static unsigned char i = 0;
P0 = 0XFF;
switch(i)
{
case 0: ADDR2 = 0; ADDR1 = 0; ADDR0 = 0; i++; P0 = Ledbuffer[0];break;
case 1: ADDR2 = 0; ADDR1 = 0; ADDR0 = 1; i++; P0 = Ledbuffer[1];break;
case 2: ADDR2 = 0; ADDR1 = 1; ADDR0 = 0; i++; P0 = Ledbuffer[2];break;
case 3: ADDR2 = 0; ADDR1 = 1; ADDR0 = 1; i++; P0 = Ledbuffer[3];break;
case 4: ADDR2 = 1; ADDR1 = 0; ADDR0 = 0; i++; P0 = Ledbuffer[4];break;
case 5: ADDR2 = 1; ADDR1 = 0; ADDR0 = 1; i=0; P0 = Ledbuffer[5];break;
default: break;
}
}
void KeyScan()
{
unsigned char i;
static unsigned char keybuffer[4][4] = {
{0xFF, 0xFF, 0xFF, 0xFF},{0xFF, 0xFF, 0xFF, 0xFF},
{0xFF, 0xFF, 0xFF, 0xFF},{0xFF, 0xFF, 0xFF, 0xFF}};
static unsigned char keyout = 0;
keybuffer[keyout][0] = (keybuffer[keyout][0] << 1) | KEY_IN_1;
keybuffer[keyout][1] = (keybuffer[keyout][1] << 1) | KEY_IN_2;
keybuffer[keyout][2] = (keybuffer[keyout][2] << 1) | KEY_IN_3;
keybuffer[keyout][3] = (keybuffer[keyout][3] << 1) | KEY_IN_4;
for(i=0; i<4; i++)
{
if((keybuffer[keyout] & 0x0f) == 0x0f)
{
keystate[keyout] = 1;
}
else if((keybuffer[keyout] & 0x0f) == 0x00 )
{
keystate[keyout] = 0;
}
}
keyout++;
keyout = keyout & 0x03;
switch(keyout)
{
case 0: KEY_OUT_4 = 1; KEY_OUT_1 = 0; break;
case 1: KEY_OUT_1 = 1; KEY_OUT_2 = 0; break;
case 2: KEY_OUT_2 = 1; KEY_OUT_3 = 0; break;
case 3: KEY_OUT_3 = 1; KEY_OUT_4 = 0; break;
default: break;
}
}
void InterruptTimer0() interrupt 1
{
TH0 = 0XFC;
TL0 = 0X67;
LedScan();
KeyScan();
}
求助:为何按键按下去了 。。数码管就不亮了
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