void ResetOneWireAndMatchDeviceRomAddress()
{
DS2482Channel.OneWireReset();
DS2482Channel.OneWireWriteByte(RomCommand.MATCH);
foreach (var item in OneWireAddress)
{
DS2482Channel.OneWireWriteByte(item);
}
}
protected byte[] GetTemperatureScratchpad()
{
ResetOneWireAndMatchDeviceRomAddress();
DS2482Channel.EnableStrongPullup();
StartTemperatureConversion();
ResetOneWireAndMatchDeviceRomAddress();
var scratchpad = ReadScratchpad();
return(scratchpad);
}
byte[] ReadScratchpad()
{
DS2482Channel.OneWireWriteByte(FunctionCommand.READ_SCRATCHPAD);
var scratchpadData = new byte[9];
for (int i = 0; i < scratchpadData.Length; i++)
{
scratchpadData[i] = DS2482Channel.OneWireReadByte();
}
return(scratchpadData);
}
public void Initialize(DS2482Channel ds2482Channel, byte[] oneWireAddress)
{
DS2482Channel = ds2482Channel;
OneWireAddress = oneWireAddress;
}
void StartTemperatureConversion()
{
DS2482Channel.OneWireWriteByte(FunctionCommand.CONVERT_T);
Task.Delay(TimeSpan.FromSeconds(1)).Wait();
}
public UndefinedOneWireDevice(DS2482Channel ds2482Channel, byte[] oneWireAddress)
{
DS2482Channel = ds2482Channel;
OneWireAddress = oneWireAddress;
}
public void Initialize(DS2482Channel ds2482, byte[] oneWireAddress)
{
throw new NotImplementedException();
}
/// <summary>
/// Perform the 1-Wire Search Algorithm on the 1-Wire bus using the existing search state.
/// </summary>
/// <returns>true : device found, ROM number in ROM_NO buffer, false : device not found, end of search</returns>
public bool OneWireSearch()
{
int id_bit_number;
int last_zero, rom_byte_number;
bool id_bit, cmp_id_bit, search_direction, search_result;
byte rom_byte_mask;
// initialize for search
id_bit_number = 1;
last_zero = 0;
rom_byte_number = 0;
rom_byte_mask = 1;
search_result = false;
_crc8 = 0;
// if the last call was not the last one
if (!_lastDeviceFlag)
{
// 1-Wire reset
if (!_oneWireMaster.Reset())
{
// reset the search
_lastDiscrepancy = 0;
_lastDeviceFlag = false;
_lastFamilyDiscrepancy = 0;
return(false);
}
// issue the search command
_oneWireMaster.WriteByte(0xF0);
// loop to do the search
do
{
// read a bit and its complement
id_bit = _oneWireMaster.ReadBit();
cmp_id_bit = _oneWireMaster.ReadBit();
// check for no devices on 1-wire
if (id_bit && cmp_id_bit)
{
break;
}
else
{
// all devices coupled have 0 or 1
if (id_bit != cmp_id_bit)
{
search_direction = id_bit; // bit write value for search
}
else
{
// if this discrepancy if before the Last Discrepancy
// on a previous next then pick the same as last time
if (id_bit_number < _lastDiscrepancy)
{
search_direction = ((_deviceAddress[rom_byte_number] & rom_byte_mask) > 0);
}
else
{
// if equal to last pick 1, if not then pick 0
search_direction = (id_bit_number == _lastDiscrepancy);
}
// if 0 was picked then record its position in LastZero
if (!search_direction)
{
last_zero = id_bit_number;
// check for Last discrepancy in family
if (last_zero < 9)
{
_lastFamilyDiscrepancy = last_zero;
}
}
}
// set or clear the bit in the ROM byte rom_byte_number
// with mask rom_byte_mask
if (search_direction)
{
_deviceAddress[rom_byte_number] |= rom_byte_mask;
}
else
{
var result = (byte)~rom_byte_mask;
_deviceAddress[rom_byte_number] &= result;
}
// serial number search direction write bit
_oneWireMaster.WriteBit(search_direction);
// increment the byte counter id_bit_number
// and shift the mask rom_byte_mask
id_bit_number++;
rom_byte_mask <<= 1;
// if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask
if (rom_byte_mask == 0)
{
DS2482Channel.CalculateGlobalCrc8(_deviceAddress[rom_byte_number], _crc8); // accumulate the CRC
rom_byte_number++;
rom_byte_mask = 1;
}
}
}while (rom_byte_number < 8); // loop until through all ROM bytes 0-7
// if the search was successful then
if (!((id_bit_number < 65) || (_crc8 != 0)))
{
// search successful so set LastDiscrepancy,LastDeviceFlag,search_result
_lastDiscrepancy = last_zero;
// check for last device
if (_lastDiscrepancy == 0)
{
_lastDeviceFlag = true;
}
search_result = true;
}
}
// if no device found then reset counters so next 'search' will be like a first
if (!search_result || _deviceAddress[0] == 0)
{
_lastDiscrepancy = 0;
_lastDeviceFlag = false;
_lastFamilyDiscrepancy = 0;
search_result = false;
}
return(search_result);
}