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標題: 經典交通燈程序只為學習無任何意圖 [打印本頁]

作者: 山師工程師 時間: 2016-12-16 15:00
標題: 經典交通燈程序只為學習無任何意圖
#include <reg52.h>
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[7] = {  //數碼管+獨立LED顯示緩沖區
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
bit flag1s = 1;       //1秒定時標志
unsigned char T0RH = 0;  //T0重載值的高字節
unsigned char T0RL = 0;  //T0重載值的低字節
void ConfigTimer0(unsigned int ms);
void TrafficLight();
void main()
{
EA = 1;    //開總中斷
ENLED = 0; //使能數碼管和LED
ADDR3 = 1;
ConfigTimer0(1);  //配置T0定時1ms

while (1)
{
      if (flag1s)  //每秒執行一次交通燈刷新
      {
         flag1s = 0;
         TrafficLight();
      }
}
}
/* 配置并啟動T0，ms-T0定時時間 */
void ConfigTimer0(unsigned int ms)
{
unsigned long tmp;  //臨時變量

tmp = 11059200 / 12;    //定時器計數頻率
tmp = (tmp * ms) / 1000;  //計算所需的計數值
tmp = 65536 - tmp;       //計算定時器重載值
tmp = tmp + 13;          //補償中斷響應延時造成的誤差
T0RH = (unsigned char)(tmp>>8);  //定時器重載值拆分為高低字節
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T0
}
/* 交通燈顯示刷新函數 */
void TrafficLight()
{
static unsigned char color = 2;  //顏色索引：0-綠色/1-黃色/2-紅色
static unsigned char timer = 0;  //倒計時定時器

if (timer == 0) //倒計時到0時，切換交通燈
{
      switch (color)  //LED8/9代表綠燈，LED5/6代表黃燈，LED2/3代表紅燈
      {
         case 0:    //切換到黃色，亮3秒
            color = 1;
            timer = 2;
            LedBuff[6] = 0xE7;
            break;
         case 1:    //切換到紅色，亮30秒
            color = 2;
            timer = 29;
            LedBuff[6] = 0xFC;
            break;
         case 2:    //切換到綠色，亮40秒
            color = 0;
            timer = 39;
            LedBuff[6] = 0x3F;
            break;
         default:
            break;
      }
}
else  //倒計時未到0時，遞減其計數值
{
      timer--;
}
LedBuff[0] = LedChar[timer%10];  //倒計時數值個位顯示
LedBuff[1] = LedChar[timer/10];  //倒計時數值十位顯示
}
/* LED動態掃描刷新函數，需在定時中斷中調用 */
void LedScan()
{
static unsigned char i = 0;

P0 = 0xFF;
P1 = (P1 & 0xF8) | i;
P0 = LedBuff[i];
if (i < 6)
      i++;
else
      i = 0;
}
/* T0中斷服務函數，完成LED掃描和秒定時 */
void InterruptTimer0() interrupt 1
{
static unsigned int tmr1s = 0;

TH0 = T0RH;
TL0 = T0RL;
LedScan();
tmr1s++;
if (tmr1s >= 1000)
{
      tmr1s = 0;
      flag1s = 1;
}
}

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