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];
}
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];
}
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);
}