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#include <reg52.h>
sbit BUZZ = P1^6;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
sbit KEY_IN_1 = P2^4;
sbit KEY_IN_2 = P2^5;
sbit KEY_IN_3 = P2^6;
sbit KEY_IN_4 = P2^7;
sbit KEY_OUT_1 = P2^3;
sbit KEY_OUT_2 = P2^2;
sbit KEY_OUT_3 = P2^1;
sbit KEY_OUT_4 = P2^0;
unsigned char code LedChar[] = { //數(shù)碼管顯示字符轉(zhuǎn)換表
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
unsigned char LedBuff[7] = { //數(shù)碼管+獨(dú)立LED顯示緩沖區(qū)
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char code KeyCodeMap[4][4] = { //矩陣按鍵編號(hào)到標(biāo)準(zhǔn)鍵盤鍵碼的映射表
{ 0x31, 0x32, 0x33, 0x26 }, //數(shù)字鍵1、數(shù)字鍵2、數(shù)字鍵3、向上鍵
{ 0x34, 0x35, 0x36, 0x25 }, //數(shù)字鍵4、數(shù)字鍵5、數(shù)字鍵6、向左鍵
{ 0x37, 0x38, 0x39, 0x28 }, //數(shù)字鍵7、數(shù)字鍵8、數(shù)字鍵9、向下鍵
{ 0x30, 0x1B, 0x0D, 0x27 } //數(shù)字鍵0、ESC鍵、回車鍵、向右鍵
};
unsigned char KeySta[4][4] = { //全部矩陣按鍵的當(dāng)前狀態(tài)
{1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}
};
unsigned long pdata KeyDownTime[4][4] = { //每個(gè)按鍵按下的持續(xù)時(shí)間，單位ms
{0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}, {0, 0, 0, 0}
};
bit enBuzz = 0; //蜂鳴器使能標(biāo)志
bit flag1s = 0; //1秒定時(shí)標(biāo)志
bit flagStart = 0; //倒計(jì)時(shí)啟動(dòng)標(biāo)志
unsigned char T0RH = 0; //T0重載值的高字節(jié)
unsigned char T0RL = 0; //T0重載值的低字節(jié)
unsigned int CountDown = 0; //倒計(jì)時(shí)計(jì)數(shù)器
void ConfigTimer0(unsigned int ms);
void ShowNumber(unsigned long num);
void KeyDriver();
void main()
{
EA = 1; //使能總中斷
ENLED = 0; //選擇數(shù)碼管和獨(dú)立LED
ADDR3 = 1;
ConfigTimer0(1); //配置T0定時(shí)1ms
ShowNumber(0); //上電顯示0
while (1)
{
KeyDriver(); //調(diào)用按鍵驅(qū)動(dòng)函數(shù)
if (flagStart && flag1s) //倒計(jì)時(shí)啟動(dòng)且1秒定時(shí)到達(dá)時(shí)，處理倒計(jì)時(shí)
{
flag1s = 0;
if (CountDown > 0) //倒計(jì)時(shí)未到0時(shí)，計(jì)數(shù)器遞減
{
CountDown--;
ShowNumber(CountDown); //刷新倒計(jì)時(shí)數(shù)顯示
if (CountDown == 0) //減到0時(shí)，執(zhí)行聲光報(bào)警
{
enBuzz = 1; //啟動(dòng)蜂鳴器發(fā)聲
LedBuff[6] = 0x00; //點(diǎn)亮獨(dú)立LED
}
}
}
}
}
/* 配置并啟動(dòng)T0，ms-T0定時(shí)時(shí)間 */
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp; //臨時(shí)變量
tmp = 11059200 / 12; //定時(shí)器計(jì)數(shù)頻率
tmp = (tmp * ms) / 1000; //計(jì)算所需的計(jì)數(shù)值
tmp = 65536 - tmp; //計(jì)算定時(shí)器重載值
tmp = tmp + 28; //補(bǔ)償中斷響應(yīng)延時(shí)造成的誤差
T0RH = (unsigned char)(tmp>>8); //定時(shí)器重載值拆分為高低字節(jié)
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0為模式1
TH0 = T0RH; //加載T0重載值
TL0 = T0RL;
ET0 = 1; //使能T0中斷
TR0 = 1; //啟動(dòng)T0
}
/* 將一個(gè)無(wú)符號(hào)長(zhǎng)整型的數(shù)字顯示到數(shù)碼管上，num-待顯示數(shù)字 */
void ShowNumber(unsigned long num)
{
signed char i;
unsigned char buf[6];
for (i=0; i<6; i++) //把長(zhǎng)整型數(shù)轉(zhuǎn)換為6位十進(jìn)制的數(shù)組
{
buf[i] = num % 10;
num = num / 10;
}
for (i=5; i>=1; i--) //從最高位起，遇到0轉(zhuǎn)換為空格，遇到非0則退出循環(huán)
{
if (buf[i] == 0)
LedBuff[i] = 0xFF;
else
break;
}
for ( ; i>=0; i--) //剩余低位都如實(shí)轉(zhuǎn)換為數(shù)碼管顯示字符
{
LedBuff[i] = LedChar[buf[i]];
}
}
/* 按鍵動(dòng)作函數(shù)，根據(jù)鍵碼執(zhí)行相應(yīng)的操作，keycode-按鍵鍵碼 */
void KeyAction(unsigned char keycode) //按鍵動(dòng)作函數(shù)，根據(jù)鍵碼執(zhí)行相應(yīng)動(dòng)作
{
if (keycode == 0x26) //向上鍵，倒計(jì)時(shí)設(shè)定值遞增
{
if (CountDown < 9999) //最大計(jì)時(shí)9999秒
{
CountDown++;
ShowNumber(CountDown);
}
}
else if (keycode == 0x28) //向下鍵，倒計(jì)時(shí)設(shè)定值遞減
{
if (CountDown > 1) //最小計(jì)時(shí)1秒
{
CountDown--;
ShowNumber(CountDown);
}
}
else if (keycode == 0x0D) //回車鍵，啟動(dòng)倒計(jì)時(shí)
{
flagStart = 1; //啟動(dòng)倒計(jì)時(shí)
}
else if (keycode == 0x1B) //Esc鍵，取消倒計(jì)時(shí)
{
enBuzz = 0; //關(guān)閉蜂鳴器
LedBuff[6] = 0xFF; //關(guān)閉獨(dú)立LED
flagStart = 0; //停止倒計(jì)時(shí)
CountDown = 0; //倒計(jì)時(shí)數(shù)歸零
ShowNumber(CountDown);
}
}
/* 按鍵驅(qū)動(dòng)函數(shù)，檢測(cè)按鍵動(dòng)作，調(diào)度相應(yīng)動(dòng)作函數(shù)，需在主循環(huán)中調(diào)用 */
void KeyDriver()
{
unsigned char i, j;
static unsigned char pdata backup[4][4] = { //按鍵值備份，保存前一次的值
{1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}
};
static unsigned long pdata TimeThr[4][4] = { //快速輸入執(zhí)行的時(shí)間閾值
{1000, 1000, 1000, 1000}, {1000, 1000, 1000, 1000},
{1000, 1000, 1000, 1000}, {1000, 1000, 1000, 1000}
};
for (i=0; i<4; i++) //循環(huán)掃描4*4的矩陣按鍵
{
for (j=0; j<4; j++)
{
if (backup[i][j] != KeySta[i][j]) //檢測(cè)按鍵動(dòng)作
{
if (backup[i][j] != 0) //按鍵按下時(shí)執(zhí)行動(dòng)作
{
KeyAction(KeyCodeMap[i][j]); //調(diào)用按鍵動(dòng)作函數(shù)
}
backup[i][j] = KeySta[i][j]; //刷新前一次的備份值
}
if (KeyDownTime[i][j] > 0) //檢測(cè)執(zhí)行快速輸入
{
if (KeyDownTime[i][j] >= TimeThr[i][j])
{ //達(dá)到閾值時(shí)執(zhí)行一次動(dòng)作
KeyAction(KeyCodeMap[i][j]); //調(diào)用按鍵動(dòng)作函數(shù)
TimeThr[i][j] += 200; //時(shí)間閾值增加200ms，以準(zhǔn)備下次執(zhí)行
}
}
else //按鍵彈起時(shí)復(fù)位閾值時(shí)間
{
TimeThr[i][j] = 1000; //恢復(fù)1s的初始閾值時(shí)間
}
}
}
}
/* 按鍵掃描函數(shù)，需在定時(shí)中斷中調(diào)用 */
void KeyScan()
{
unsigned char i;
static unsigned char keyout = 0; //矩陣按鍵掃描輸出索引
static unsigned char keybuf[4][4] = { //矩陣按鍵掃描緩沖區(qū)
{0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF},
{0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF}
};
//將一行的4個(gè)按鍵值移入緩沖區(qū)
keybuf[keyout][0] = (keybuf[keyout][0] << 1) | KEY_IN_1;
keybuf[keyout][1] = (keybuf[keyout][1] << 1) | KEY_IN_2;
keybuf[keyout][2] = (keybuf[keyout][2] << 1) | KEY_IN_3;
keybuf[keyout][3] = (keybuf[keyout][3] << 1) | KEY_IN_4;
//消抖后更新按鍵狀態(tài)
for (i=0; i<4; i++) //每行4個(gè)按鍵，所以循環(huán)4次
{
if ((keybuf[keyout][i] & 0x0F) == 0x00)
{ //連續(xù)4次掃描值為0，即4*4ms內(nèi)都是按下?tīng)顟B(tài)時(shí)，可認(rèn)為按鍵已穩(wěn)定的按下
KeySta[keyout][i] = 0;
KeyDownTime[keyout][i] += 4; //按下的持續(xù)時(shí)間累加
}
else if ((keybuf[keyout][i] & 0x0F) == 0x0F)
{ //連續(xù)4次掃描值為1，即4*4ms內(nèi)都是彈起狀態(tài)時(shí)，可認(rèn)為按鍵已穩(wěn)定的彈起
KeySta[keyout][i] = 1;
KeyDownTime[keyout][i] = 0; //按下的持續(xù)時(shí)間清零
}
}
//執(zhí)行下一次的掃描輸出
keyout++; //輸出索引遞增
keyout &= 0x03; //索引值加到4即歸零
switch (keyout) //根據(jù)索引，釋放當(dāng)前輸出引腳，拉低下次的輸出引腳
{
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;
}
}
/* LED動(dòng)態(tài)掃描刷新函數(shù)，需在定時(shí)中斷中調(diào)用 */
void LedScan()
{
static unsigned char i = 0; //動(dòng)態(tài)掃描索引
P0 = 0xFF; //關(guān)閉所有段選位，顯示消隱
P1 = (P1 & 0xF8) | i; //位選索引值賦值到P1口低3位
P0 = LedBuff[i]; //緩沖區(qū)中索引位置的數(shù)據(jù)送到P0口
if (i < 6) //索引遞增循環(huán)，遍歷整個(gè)緩沖區(qū)
i++;
else
i = 0;
}
/* T0中斷服務(wù)函數(shù)，完成數(shù)碼管、按鍵掃描與秒定時(shí) */
void InterruptTimer0() interrupt 1
{
static unsigned int tmr1s = 0; //1秒定時(shí)器
TH0 = T0RH; //重新加載重載值
TL0 = T0RL;
if (enBuzz) //蜂鳴器發(fā)聲處理
BUZZ = ~BUZZ; //驅(qū)動(dòng)蜂鳴器發(fā)聲
else
BUZZ = 1; //關(guān)閉蜂鳴器
LedScan(); //LED掃描顯示
KeyScan(); //按鍵掃描
if (flagStart) //倒計(jì)時(shí)啟動(dòng)時(shí)處理1秒定時(shí)
{
tmr1s++;
if (tmr1s >= 1000)
{
tmr1s = 0;
flag1s = 1;
}
}
else //倒計(jì)時(shí)未啟動(dòng)時(shí)1秒定時(shí)器始終歸零
{
tmr1s = 0;
}
}

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