原创 DS1302源程序

 2006-12-30 01:37  4461 8 8 分类: MCU/ 嵌入式

DS1302源程序

hotpower 发表于 2004-9-13 13:10 侃单片机 ←返回版面

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//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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