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DS1302讀寫(xiě)一體化C51源程序 (由hotpower撰寫(xiě))

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DS1302讀寫(xiě)一體化C51源程序 (由hotpower撰寫(xiě))

作者:佚名來(lái)源:不詳錄入:Admin 更新時(shí)間：2008-8-17 19:42:28 點(diǎn)擊數(shù)：6

【字體：

】

DS1302讀寫(xiě)一體化C51源程序 (hotpower)

/*----------------------------------------------
DS1302讀寫(xiě)一體化C51源程序
HotPower@126.com
------------------------------------------------*/
//打開(kāi)DS1302
void TimeSpiOpen(void)
{
  TIMECLK = 0;
  TIMERST = 0;//禁止DS1302
  TIMEIO  = 1;//釋放數(shù)據(jù)總線(xiàn)
  TIMERST = 1;//使能DS1302
}

//關(guān)閉DS1302
void TimeSpiClose(void)
{
  TIMERST = 0;//禁止DS1302
  TIMEIO  = 1;//釋放數(shù)據(jù)總線(xiàn)
  TIMECLK = 1;
}
//讀寫(xiě)DS1302
unsigned char TimeSpiReadWrite(unsigned char val)
{
unsigned char i;
  ACC = val;//取8位數(shù)據(jù)
  for (i = 8;i > 0; i--)
  {
    TIMECLK = 0;//時(shí)鐘下降沿輸入數(shù)據(jù)(DS1302讀)
    _nop_();//延時(shí)
    CY = TIMEIO;//接收串行數(shù)據(jù)到CY
    _rrca_();//右移一位數(shù)據(jù)到CY(先存后取)
    TIMEIO = CY;//發(fā)送串行數(shù)據(jù)
    TIMECLK = 1;//時(shí)鐘上升沿打入數(shù)據(jù)(DS1302寫(xiě))
    TIMEIO  = 1;//釋放數(shù)據(jù)總線(xiàn)
  }
  val = ACC;
  return val;
}

//讀DS1302字節(jié)
unsigned char TimeByteRead(unsigned char address)
{
  TimeSpiOpen();//打開(kāi)DS1302
  TimeSpiReadWrite(address);//寫(xiě)入DS1302命令
  address = TimeSpiReadWrite(0xff);//讀入DS1302數(shù)據(jù)
  TimeSpiClose();//關(guān)閉DS1302
  return address;//返回?cái)?shù)據(jù)
}

//讀DS1302RAM字節(jié)
unsigned char TimeRamByteRead(unsigned char address)
{
  TimeSpiOpen();//打開(kāi)DS1302
  TimeSpiReadWrite((address << 1) 0xc1);//寫(xiě)入DS1302命令
  address = TimeSpiReadWrite(0xff);//讀入DS1302數(shù)據(jù)
  TimeSpiClose();//關(guān)閉DS1302
  return address;//返回?cái)?shù)據(jù)
}

//寫(xiě)DS1302字節(jié)
void TimeByteWrite(unsigned char address, unsigned char val)
{
  TimeSpiOpen();//打開(kāi)DS1302
  TimeSpiReadWrite(address);//寫(xiě)地址
  TimeSpiReadWrite(val);//寫(xiě)數(shù)據(jù)
  TimeSpiClose();//關(guān)閉DS1302
}

//寫(xiě)DS1302字節(jié)
void TimeRamByteWrite(unsigned char address, unsigned char val)
{
  TimeSpiOpen();//打開(kāi)DS1302
  TimeSpiReadWrite((address << 1) 0xc0);//寫(xiě)地址
  TimeSpiReadWrite(val);//寫(xiě)數(shù)據(jù)
  TimeSpiClose();//關(guān)閉DS1302
}

//使能DS1302寫(xiě)保護(hù)
void TimeWriteEnable(void)
{
  TimeByteWrite(timewriteregall, timewriteseg);//使能DS1302寫(xiě)保護(hù)
}

//開(kāi)放DS1302寫(xiě)保護(hù)
void TimeWrieDisbale(void)
{
  TimeByteWrite(timewriteregall, 0);//開(kāi)放DS1302寫(xiě)保護(hù)
}

//DS1302工作開(kāi)始
void TimeWorkStart(void)
{
unsigned char val;
  val = TimeByteRead(timereadseg);//讀秒數(shù)據(jù)
  val &= 0x7f;//打開(kāi)晶振
  TimeWrieDisbale();//開(kāi)放DS1302寫(xiě)保護(hù)
  TimeByteWrite(timewriteseg, val);//打開(kāi)晶振
  TimeByteWrite(tricklewrite, 0xa5);//打開(kāi)充電二極管
  TimeWriteEnable();//使能DS1302寫(xiě)保護(hù)
}

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