+++

可设置温度上下限的温控

/****************************
       DS1302内部函数
*****************************/
#ifndef _ds1302_h_
#define _ds1302_h_
sbit T_RST=P2^4;
sbit T_CLK=P2^5;
sbit T_IO=P2^6;
//sbit T_RST=P4^1;
//sbit T_CLK=P4^0;
//sbit T_IO=P4^2;
sbit ACC0=ACC^0;
sbit ACC7=ACC^7;
typedef struct systemtime
{
   uchar second;
	uchar minute;
	uchar hour;
	uchar week;
	uchar day;
	uchar month;
	uchar year;
	uchar DateString[9];
	uchar TimeString[9];
}systemtime;	//定义的时间类型
/*向DS1302中写入1BYTE数据*/
void writeB(uchar ucda)
{
   uchar i;
   ACC=ucda;
	for(i=8;i>0;i--)
	  {
	    T_IO=ACC0;
		 T_CLK=1;
		 T_CLK=0;
		 ACC=ACC>>1;
	  }
//	T_IO=0;
}
/*从DS1302中读出1BYTE数据*/
uchar readB()
{
  uchar i;
  for(i=8;i>0;i--)
    {
	   ACC=ACC>>1;
		ACC7=T_IO;
		T_CLK=1;
		T_CLK=0;
	 }
//  T_IO=0;
  return(ACC);
}
/*单字节读，向DS1302某地址中读出数据，
  先写地址后写命令/数据*************/
uchar r_ds1302(uchar ucaddr)
{
  uchar ucda;
  T_RST=0;
  T_CLK=0;
  T_RST=1;
  writeB(ucaddr);
  ucda=readB();
  T_CLK=1;
  T_RST=0;
  return(ucda);
}
/**********************************
 读取 DS1302当前时间，
 格式为:
   秒，分，时，日，月，星期，年
**********************************/
void get_ds1302(systemtime *Time)
{
   uchar readtime;
   readtime = r_ds1302(0x81);  //秒寄存器读操作0x81
	Time->second = ((readtime&0x70)>>4)*10 + (readtime&0x0f); //十位+个位
	readtime = r_ds1302(0x83);  //分寄存器读操作0x83
	Time->minute = ((readtime&0x70)>>4)*10 + (readtime&0x0f);
	readtime = r_ds1302(0x85);
	Time->hour = ((readtime&0x70)>>4)*10 + (readtime&0x0f);
	readtime = r_ds1302(0x87);
	Time->day = ((readtime&0x70)>>4)*10 + (readtime&0x0f);	
	//readtime = r_1302(0x8b);
	//Ttime->week = ((readtime&0x70)>>4)*10 + (readtime&0x0f);
	readtime = r_ds1302(0x89);
	Time->month = ((readtime&0x70)>>4)*10 + (readtime&0x0f);
	readtime = r_ds1302(0x8d);
	Time->year = ((readtime&0x70)>>4)*10 + (readtime&0x0f);

  	//将十进制数转换为液晶显示的ASCII值
	Time->DateString[0] = Time->year/10 + '0';
	Time->DateString[1] = Time->year%10 + '0';
	Time->DateString[2] = '-';
	Time->DateString[3] = Time->month/10 + '0';
	Time->DateString[4] = Time->month%10 + '0';
	Time->DateString[5] = '-';
	Time->DateString[6] = Time->day/10 + '0';
	Time->DateString[7] = Time->day%10 + '0';
	Time->DateString[8] = '\0';

	//将十进制数转换为液晶显示的ASCII值
	Time->TimeString[0] = Time->hour/10 + '0';
	Time->TimeString[1] = Time->hour%10 + '0';
	Time->TimeString[2] = ':';
	Time->TimeString[3] = Time->minute/10 + '0';
	Time->TimeString[4] = Time->minute%10 + '0';
	Time->TimeString[5] = ':';
	Time->TimeString[6] = Time->second/10 + '0';
	Time->TimeString[7] = Time->second%10 + '0';
	Time->TimeString[8] = '\0';
}
#endif