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 导航:老古开发网首页→文章索引→索引第2105页 →文章分类→单片机→第42页→[DS1302读写一体化C51源程序 (由hotpower撰写)]
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第2674篇:DS1302读写一体化C51源程序 (由hotpower撰写) |
| 发布时间:2006年8月1日 点击次数:1596 |
| 来源: 作者: |
/*---------------------------------------------- DS1302读写一体化C51源程序 HotPower@126.com ------------------------------------------------*/ //打开DS1302 void TimeSpiOpen(void) { TIMECLK = 0; TIMERST = 0;//禁止DS1302 TIMEIO = 1;//释放数据总线 TIMERST = 1;//使能DS1302 } //关闭DS1302 void TimeSpiClose(void) { TIMERST = 0;//禁止DS1302 TIMEIO = 1;//释放数据总线 TIMECLK = 1; } //读写DS1302 unsigned char TimeSpiReadWrite(unsigned char val) { unsigned char i; ACC = val;//取8位数据 for (i = 8;i > 0; i--) { TIMECLK = 0;//时钟下降沿输入数据(DS1302读) _nop_();//延时 CY = TIMEIO;//接收串行数据到CY _rrca_();//右移一位数据到CY(先存后取) TIMEIO = CY;//发送串行数据 TIMECLK = 1;//时钟上升沿打入数据(DS1302写) TIMEIO = 1;//释放数据总线 } val = ACC; return val; } //读DS1302字节 unsigned char TimeByteRead(unsigned char address) { TimeSpiOpen();//打开DS1302 TimeSpiReadWrite(address);//写入DS1302命令 address = TimeSpiReadWrite(0xff);//读入DS1302数据 TimeSpiClose();//关闭DS1302 return address;//返回数据 } //读DS1302RAM字节 unsigned char TimeRamByteRead(unsigned char address) { TimeSpiOpen();//打开DS1302 TimeSpiReadWrite((address << 1) 0xc1);//写入DS1302命令 address = TimeSpiReadWrite(0xff);//读入DS1302数据 TimeSpiClose();//关闭DS1302 return address;//返回数据 } //写DS1302字节 void TimeByteWrite(unsigned char address, unsigned char val) { TimeSpiOpen();//打开DS1302 TimeSpiReadWrite(address);//写地址 TimeSpiReadWrite(val);//写数据 TimeSpiClose();//关闭DS1302 } //写DS1302字节 void TimeRamByteWrite(unsigned char address, unsigned char val) { TimeSpiOpen();//打开DS1302 TimeSpiReadWrite((address << 1) 0xc0);//写地址 TimeSpiReadWrite(val);//写数据 TimeSpiClose();//关闭DS1302 } //使能DS1302写保护 void TimeWriteEnable(void) { TimeByteWrite(timewriteregall, timewriteseg);//使能DS1302写保护 } //开放DS1302写保护 void TimeWrieDisbale(void) { TimeByteWrite(timewriteregall, 0);//开放DS1302写保护 } //DS1302工作开始 void TimeWorkStart(void) { unsigned char val; val = TimeByteRead(timereadseg);//读秒数据 val &= 0x7f;//打开晶振 TimeWrieDisbale();//开放DS1302写保护 TimeByteWrite(timewriteseg, val);//打开晶振 TimeByteWrite(tricklewrite, 0xa5);//打开充电二极管 TimeWriteEnable();//使能DS1302写保护 } |
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