Compute a Dallas Semiconductor 8 bit CRC. These show up in the ROM and the registers. (Use tiny 2x16 entry CRC table)

Read a byte

Read a bit. Port and bit is used to cut lookup time and provide more certain timing.

Perform the onewire reset function. We will wait up to 250uS for the bus to come high, if it doesn't then it is broken or shorted and we return a 0;

You need to use this function to start a search again from the beginning. You do not need to do it for the first search, though you could.

Perform a search. If this function returns a '1' then it has enumerated the next device and you may retrieve the ROM from the OneWire::address variabl

Do a ROM select

Do a ROM skip

Setup the search to find the device type 'family_code' on the next call to search(*newAddr) if it is present.

Write a byte. The writing code uses the active drivers to raise the pin high, if you need power after the write (e.g. DS18S20 in parasite power mode)

Write a bit. Port and bit is used to cut lookup time and provide more certain timing.