#include <reg52.h>
sbit ADDR0 = P1^0;
sbit ADDR1 = P1^1;
sbit ADDR2 = P1^2;
sbit ADDR3 = P1^3;
sbit ENLED = P1^4;
unsigned char code LedChar[] = { //數碼管顯示字符轉換表
0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E
};
unsigned char LedBuff[6] = { //數碼管顯示緩沖區，初值0xFF確保啟動時都不亮
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned char i = 0; //動態掃描的索引
unsigned int cnt = 0; //記錄T0中斷次數
unsigned char flag1s = 0; //1秒定時標志
void main()
{
char j; //循環變量
unsigned long sec = 0; //記錄經過的秒數
unsigned char buf[6]; //中間轉換緩沖區
EA = 1; //使能總中斷
ENLED = 0; //使能U3
ADDR3 = 1; //因為需要動態改變ADDR0-2的值，所以不需要再初始化了
TMOD = 0x01; //設置T0為模式1
TH0 = 0xFC; //為T0賦初值0xFC67，定時1ms
TL0 = 0x67;
ET0 = 1; //使能T0中斷
TR0 = 1; //啟動T0
while (1)
{
if (flag1s == 1) //判斷1秒定時標志
{
flag1s = 0; //1秒定時標志清零
sec++; //秒計數自加1
//將sec按十進制位從低到高依次提取到buf數組中
buf[0] = sec%10;
buf[1] = sec/10%10;
buf[2] = sec/100%10;
buf[3] = sec/1000%10;
buf[4] = sec/10000%10;
buf[5] = sec/100000%10;
//從最高為開始，遇到0不顯示，遇到非0退出循環
for (j=5; j>=1; j--)
{
if (buf[j] == 0)
LedBuff[j] = 0xFF;
else
break;
}
//將剩余的有效數字位如實轉換
for ( ; j>=0; j--) //for()起始未對j操作，j即保持上個循環結束時的值
{
LedBuff[j] = LedChar[buf[j]];
}
}
}
}
/* 定時器0中斷服務函數 */
void InterruptTimer0() interrupt 1
{
TH0 = 0xFC; //重新加載初值
TL0 = 0x67;
cnt++; //中斷次數計數值加1
if (cnt >= 1000) //中斷1000次即1秒
{
cnt = 0; //清零計數值以重新開始下1秒計時
flag1s = 1; //設置1秒定時標志為1
}
//以下代碼完成數碼管動態掃描刷新
P0 = 0xFF; //顯示消隱
switch (i)
{
case 0: ADDR2=0; ADDR1=0; ADDR0=0; i++; P0=LedBuff[0]; break;
case 1: ADDR2=0; ADDR1=0; ADDR0=1; i++; P0=LedBuff[1]; break;
case 2: ADDR2=0; ADDR1=1; ADDR0=0; i++; P0=LedBuff[2]; break;
case 3: ADDR2=0; ADDR1=1; ADDR0=1; i++; P0=LedBuff[3]; break;
case 4: ADDR2=1; ADDR1=0; ADDR0=0; i++; P0=LedBuff[4]; break;
case 5: ADDR2=1; ADDR1=0; ADDR0=1; i=0; P0=LedBuff[5]; break;
default: break;
}
}
原理圖:http://www.raoushi.com/bbs/dpj-210214-1.html
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