i2cset(8) -- Linux man page



i2cset - set I2C registers



i2cset i2cbus chip-address data-address value [mode]



i2cset is a small helper program to set registers visible through the I2C bus.



There are four required options to i2cset. i2cbus indicates the number of the I2C bus to be scanned. This number should correspond to one of the busses listed by i2cdetect -l. chip-address specifies the address of the chip on that bus, and is an integer between 0x00 and 0x7F. data-address specifies the address on that chip to write to, and is an integer between 0x00 and 0xFF. value is the value to write to that location on the chip.

The mode parameter, if specified, is one of the letters b or w, corresponding to a write size of a single byte or a 16-bit word, respectively. If the mode parameter is omitted, i2cset defaults to byte mode. The value provided must be within range for the specified data type (0x00-0xFF for bytes, 0x0000-0xFFFF for words).



i2cset can be extremely dangerous if used improperly. It can confuse your I2C bus, cause data loss, or have more serious side effects. Writing to a serial EEPROM on a memory DIMM (chip addresses between 0x50 and 0x57) may DESTROY your memory, leaving your system unbootable! Be extremely careful using this program.






i2cdump(8), isaset(8)



Frodo Looijaard, Mark D. Studebaker, and the lm_sensors group http://www.lm-sensors.nu/ This manual page was originally written by David Z Maze <dmaze@debian.org> for the Debian GNU/Linux system. It was then reviewed by the lm_sensors team and is now part of the lm_sensors source distribution.