Exemplo n.º 1
0
unsigned char C1WireByKernel::ThreadReadRawDataDualChannelAddressableSwitch(const std::string& deviceFileName) const
{
   static const unsigned char CmdReadPioRegisters[]={0xF5};
   unsigned char answer[1];
   if (!sendAndReceiveByRwFile(deviceFileName,CmdReadPioRegisters,sizeof(CmdReadPioRegisters),answer,sizeof(answer)))
      throw OneWireReadErrorException(deviceFileName);
   // Check received data : datasheet says that b[7-4] is complement to b[3-0]
   if ((answer[0]&0xF0)!=(((~answer[0])&0x0F)<<4))
      throw OneWireReadErrorException(deviceFileName);
   return answer[0];
}
Exemplo n.º 2
0
unsigned char C1WireByKernel::ThreadReadRawData8ChannelAddressableSwitch(const std::string& deviceFileName) const
{
   static const unsigned char CmdReadPioRegisters[]={0xF5};
   unsigned char answer[33];
   if (!sendAndReceiveByRwFile(deviceFileName,CmdReadPioRegisters,sizeof(CmdReadPioRegisters),answer,sizeof(answer)))
      throw OneWireReadErrorException(deviceFileName);

   // Now check the Crc
   unsigned char crcData[33];
   crcData[0]=CmdReadPioRegisters[0];
   for(int i=0;i<32;i++)
      crcData[i+1]=answer[i];
   if (Crc16(crcData,sizeof(crcData))!=answer[32])
      throw OneWireReadErrorException(deviceFileName);

   return answer[0];
}
Exemplo n.º 3
0
float C1WireByKernel::ThreadReadRawDataHighPrecisionDigitalThermometer(const std::string& deviceFileName) const
{
   // The only native-supported device (by w1-therm module)
   std::string data;
   bool bFoundCrcOk=false;

   static const std::string tag("t=");

   std::ifstream file;
   std::string fileName=deviceFileName;
   fileName+="/w1_slave";
   file.open(fileName.c_str());
   if (file.is_open())
   {
      std::string sLine;
      while (!file.eof())
      {
         getline(file, sLine);
         int tpos;
         if (sLine.find("crc=")!=std::string::npos)
         {
            if (sLine.find("YES")!=std::string::npos)
               bFoundCrcOk=true;
         }
         else if ((tpos=sLine.find(tag))!=std::string::npos)
         {
            data = sLine.substr(tpos+tag.length());
         }
      }
      file.close();
   }

   if (bFoundCrcOk)
   {
	   if (is_number(data))
		return (float)atoi(data.c_str()) / 1000.0f; // Temperature given by kernel is in thousandths of degrees
   }

   throw OneWireReadErrorException(deviceFileName);
}