I2CGET(8)I2CGET(8)NAMEi2cget - read from I2C/SMBus chip registers
SYNOPSISi2cget [-y] i2cbus chip-address [data-address [mode]]
i2cget-V
DESCRIPTIONi2cget is a small helper program to read registers visible through the
I2C bus (or SMBus).
OPTIONS-V Display the version and exit.
-y Disable interactive mode. By default, i2cget will wait for a
confirmation from the user before messing with the I2C bus. When
this flag is used, it will perform the operation directly. This
is mainly meant to be used in scripts. Use with caution.
There are two required options to i2cget. 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 0x03 and 0x77.
data-address specifies the address on that chip to read from, and is an
integer between 0x00 and 0xFF. If omitted, the currently active regis‐
ter will be read (if that makes sense for the considered chip).
The mode parameter, if specified, is one of the letters b, w or c, cor‐
responding to a read byte data, a read word data or a write byte/read
byte transaction, respectively. A p can also be appended to the mode
parameter to enable PEC. If the mode parameter is omitted, i2cget
defaults to a read byte data transaction, unless data-address is also
omitted, in which case the default (and only valid) transaction is a
single read byte.
WARNINGi2cget can be extremely dangerous if used improperly. I2C and SMBus are
designed in such a way that an SMBus read transaction can be seen as a
write transaction by certain chips. This is particularly true if set‐
ting mode to cp (write byte/read byte with PEC). Be extremely careful
using this program.
CONFORMING TO
lm_sensors-2.x
SEE ALSOi2cdump(8), i2cset(8)AUTHOR
Jean Delvare http://www.lm-sensors.nu/ This manual page was strongly
inspired from those written by David Z Maze for i2cset.
September 2005 I2CGET(8)