📄 单片机坐标给ds1302程序加注解.htm
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style="LINE-HEIGHT: 150%"><B>给ds1302程序加注解</B><BR>
<P>//DS1302源程序 </P>
<P>//打开DS1302<BR>void TimeSpiOpen(void)<BR>{<BR> TIMECLK
= 0;<BR> TIMERST = 0;//禁止DS1302<BR> TIMEIO =
1;//释放数据总线<BR> TIMERST = 1;//使能DS1302<BR>}</P>
<P>//关闭DS1302<BR>void TimeSpiClose(void)<BR>{<BR>
TIMERST = 0;//禁止DS1302<BR> TIMEIO =
1;//释放数据总线<BR> TIMECLK =
1;<BR>}<BR>//读写DS1302<BR>unsigned char
TimeSpiReadWrite(unsigned char val)<BR>{<BR>unsigned char
i;<BR> ACC = val;//取8位数据<BR> for (i = 8;i > 0;
i--)<BR> {<BR> TIMECLK =
0;//时钟下降沿输入数据(DS1302读)<BR>
_nop_();//延时<BR> CY =
TIMEIO;//接收串行数据到CY<BR>
_rrca_();//右移一位数据到CY(先存后取)<BR> TIMEIO =
CY;//发送串行数据<BR> TIMECLK =
1;//时钟上升沿打入数据(DS1302写)<BR> TIMEIO =
1;//释放数据总线<BR> }<BR> val = ACC;<BR> return
val;<BR>}</P>
<P>//读DS1302字节<BR>unsigned char TimeByteRead(unsigned char
address)<BR>{<BR> TimeSpiOpen();//打开DS1302<BR>
TimeSpiReadWrite(address);//写入DS1302命令<BR> address =
TimeSpiReadWrite(0xff);//读入DS1302数据<BR>
TimeSpiClose();//关闭DS1302<BR> return
address;//返回数据<BR>}</P>
<P>//读DS1302RAM字节<BR>unsigned char TimeRamByteRead(unsigned
char address)<BR>{<BR>
TimeSpiOpen();//打开DS1302<BR> TimeSpiReadWrite((address
<< 1) | 0xc1);//写入DS1302命令<BR> address =
TimeSpiReadWrite(0xff);//读入DS1302数据<BR>
TimeSpiClose();//关闭DS1302<BR> return
address;//返回数据<BR>}</P>
<P><BR>//写DS1302字节<BR>void TimeByteWrite(unsigned char
address, unsigned char val)<BR>{<BR>
TimeSpiOpen();//打开DS1302<BR>
TimeSpiReadWrite(address);//写地址<BR>
TimeSpiReadWrite(val);//写数据<BR>
TimeSpiClose();//关闭DS1302<BR>}</P>
<P>//写DS1302字节<BR>void TimeRamByteWrite(unsigned char address,
unsigned char val)<BR>{<BR>
TimeSpiOpen();//打开DS1302<BR> TimeSpiReadWrite((address
<< 1) | 0xc0);//写地址<BR>
TimeSpiReadWrite(val);//写数据<BR>
TimeSpiClose();//关闭DS1302<BR>}</P>
<P>//使能DS1302写保护<BR>void TimeWriteEnable(void)<BR>{<BR>
TimeByteWrite(timewriteregall,
timewriteseg);//使能DS1302写保护<BR>}</P>
<P>//开放DS1302写保护<BR>void TimeWrieDisbale(void)<BR>{<BR>
TimeByteWrite(timewriteregall, 0);//开放DS1302写保护<BR>}</P>
<P>//DS1302工作开始<BR>void TimeWorkStart(void)<BR>{<BR>unsigned
char val;<BR> val =
TimeByteRead(timereadseg);//读秒数据<BR> val &=
0x7f;//打开晶振<BR>
TimeWrieDisbale();//开放DS1302写保护<BR>
TimeByteWrite(timewriteseg, val);//打开晶振<BR>
TimeByteWrite(tricklewrite, 0xa5);//打开充电二极管<BR>
TimeWriteEnable();//使能DS1302写保护<BR>}<BR></P>
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<TD>2005-11-26
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