1-wire protocol is used to communicate with certain device that support 1-wire such as ds1820b temperature sensor. Interrupt based event-driven state machine is used to perform the task.
OneWire requires a single 4.7K pullup resistor, connected between the pin and +5 volts. Then just connect each 1-wire device to the pin and ground. Please refer to the specifications for the 1-wire devices you are using. If you wish to seperate the tx rx line (implement using full duplex uart) of 1 wire of the mcu, you can connect a buffer in between. More information can be found here
1-Wire bus interface circuitry
Otherwise, if uart is configured to txrx mode, 1 wire can be connect simply as below:
this library provide very easy to use api to help communicate with 1 wire device. for example of performing rom searching to retrieve unique id of 1 wire device on multiple slave (command code 0xf0):
initiate rom search command by:
owRomSearchInit(); get the result of rom searching by either :
- polling
uint8_t *romUID = getResultRomUid(); - non-blocking
if(owSearchRomGetResult(ptrToRomUid)){
//romUid is ready here
}