modm API documentation


enum  modm::one_wire::RomCommand {
  SEARCH_ROM = 0xf0, READ_ROM = 0x33, MATCH_ROM = 0x55, SKIP_ROM = 0xcc,

Detailed Description

lbuild module: modm:architecture:1-wire

1-Wire is a device communications bus system designed by Dallas Semiconductor Corp. that provides low-speed data, signaling and power over a single signal. 1-Wire is similar in concept to I²C, but with lower data rates and longer range. It is typically used to communicate with small inexpensive devices such as digital thermometers and weather instruments.

One distinctive feature of the bus is the possibility to use only two wires: data and ground. To accomplish this, 1-wire devices include an 800 pF capacitor to store charge, and power the device during periods where the data line is used for data.

Enumeration Type Documentation

ROM Commands

After the bus master has detected a presence pulse, it can issue a ROM command. These commands operate on the unique 64-bit ROM codes of each slave device and allow the master to single out a specific device if many are present on the 1-Wire bus.

These commands also allow the master to determine how many and what types of devices are present on the bus or if any device has experienced an alarm condition.

There are five ROM commands, and each command is 8 bits long.