Let's Control It

Code: Select all

boolean Plugin_004_DS_readTemp(uint8_t ROM[8], float *value)
{
  int16_t DSTemp;
  byte ScratchPad[12];
  
  Plugin_004_DS_reset();
  Plugin_004_DS_write(0x55);           // Choose ROM
  for (byte i = 0; i < 8; i++)
    Plugin_004_DS_write(ROM[i]);
  Plugin_004_DS_write(0x44);

  delay(800);

  Plugin_004_DS_reset();
  Plugin_004_DS_write(0x55);           // Choose ROM
  for (byte i = 0; i < 8; i++)
    Plugin_004_DS_write(ROM[i]);
  Plugin_004_DS_write(0xBE); // Read scratchpad

  for (byte i = 0; i < 9; i++)            // copy 8 bytes
    ScratchPad[i] = Plugin_004_DS_read();

  if (Plugin_004_DS_crc8(ScratchPad, 8) != ScratchPad[8])
    {
      *value=0;
      return false;
    }

  if(ROM[0] == 0x28 ) //DS18B20
    {
      DSTemp = (ScratchPad[1] << 8) + ScratchPad[0];
      *value = (float(DSTemp) * 0.0625);
    }
  else if(ROM[0] == 0x10 ) //DS1820 DS18S20
    {
      DSTemp = (ScratchPad[1] << 11) + ScratchPad[0] << 3;
      DSTemp = ((DSTemp & 0xfff0) << 3) - 16 + 
        (
          ((ScratchPad[7] - ScratchPad[6]) << 7) /
            ScratchPad[7]
        );
    *value = float(DSTemp) * 0.0078125;
  }

  return true;
}