一、功能描述
打开单片机板进行倒数
二、程序展示
/******************СÃÛ·äÀÏʦµÄ51µ¥Æ¬»ú¿ª·¢ÏîÄ¿°¸Àý********************
СÃÛ·äµÄ¿ª·¢Ì×¼þ¹ºÂòÁ´½Ó£ºxmfkj.taobao.com
**********************************************************************/
#include "reg52.h"
sbit C1 = P2^7;
sbit C2 = P2^6;
sbit C3 = P2^5;
sbit C4 = P2^4;
//¶¨Òå¹²ÑôÊýÂë¹ÜÎÞСÊýµãµÄÊý×Ö¶ÎÂëÖµ
unsigned char SMGNoDot_CA[10] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90};
unsigned int count = 1000;
/*==================ÊýÂë¹Ü¶¯Ì¬ÏÔʾרÓÃÑÓʱº¯Êý==================*/
void DelaySMG(unsigned int t)
{
while(t--);
}
/*=====================µ¥¸öÊýÂë¹ÜÏÔʾº¯Êý=======================*/
void DisPlaySMG_Bit(unsigned char pos, unsigned char dat)
{
P0 = 0xff; //ÏûÒþ
switch(pos) //Ñ¡ÔñÊýÂë¹ÜλÖÃ
{
case 1:
C1 = 1; C2 = 0; C3 = 0; C4 = 0;
break;
case 2:
C1 = 0; C2 = 1; C3 = 0; C4 = 0;
break;
case 3:
C1 = 0; C2 = 0; C3 = 1; C4 = 0;
break;
case 4:
C1 = 0; C2 = 0; C3 = 0; C4 = 1;
break;
}
P0 = dat; //Êä³öÊýÂë¹ÜÏÔʾµÄÄÚÈÝ
}
/*====================4¸öÊýÂë¹Ü¶¯Ì¬ÏÔʾº¯Êý======================*/
void DisPlaySMG_4Bit(unsigned int dat)
{
DisPlaySMG_Bit(1, SMGNoDot_CA[dat / 1000]); //ǧλ
DelaySMG(1);
DisPlaySMG_Bit(2, SMGNoDot_CA[(dat % 1000) / 100]); //°Ùλ
DelaySMG(1);
DisPlaySMG_Bit(3, SMGNoDot_CA[(dat % 100) / 10]); //ʮλ
DelaySMG(1);
DisPlaySMG_Bit(4, SMGNoDot_CA[(dat % 10)]); //¸öλ
DelaySMG(1);
}
/*===================4¸öÊýÂë¹ÜÒÀ´ÎÏÔʾ0¡«9º¯Êý====================*/
void DisPlaySMG_zero_nine()
{
char i;
C1 = 1;
C2 = 1;
C3 = 1;
C4 = 1;
for(i = 0; i < 10; i++)
{
P0 = SMGNoDot_CA[i];
DelaySMG(40000);
}
}
/*=================´øÊýÂë¹ÜˢеÄÑÓʱº¯Êý======================*/
void Delay(unsigned int t)
{
while(t--)
{
DisPlaySMG_4Bit(count);
}
}
/*==========================Ö÷º¯Êý============================*/
void main()
{
DisPlaySMG_zero_nine();
while(1)
{
DisPlaySMG_4Bit(count);
Delay(100);
count++;
if(count == 1000)
{
count = 3000;
}
}
}
三、单片机板展示
四、小结
这次是我们进行的一次单片机板的实验，我觉得这次还蛮好玩的，这也让我对单片机这门课程更感兴趣了。
