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Jean Delvare
49a745af33
does, but it only triggers a transaction on even register addresses, relying on the target chip to increment its internal register pointer between the high and low byte of the word. EEPROMs behave that way, so this mode makes it possible to dump an EEPROM contents faster. I2C Block Read is still faster but it isn't available on all busses, while SMBus Read Word is very popular. This mode also makes it possible to test SMBus Read Word transactions on a given adapter using common EEPROMs. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@3286 7894878c-1315-0410-8ee3-d5d059ff63e0
76 lines
2.8 KiB
Plaintext
76 lines
2.8 KiB
Plaintext
.TH I2CDUMP 8 "April 2006"
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.SH NAME
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i2cdump \- examine I2C registers
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.SH SYNOPSIS
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.B i2cdump
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.RB [ -y ]
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.I i2cbus
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.I address
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.RI [ mode ]
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.RI [ "bank " [ bankreg ]]
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.br
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.B i2cdump
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.B -V
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.SH DESCRIPTION
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i2cdump is a small helper program to examine registers
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visible through the I2C bus.
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.SH OPTIONS
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.TP
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.B -V
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Display the version and exit.
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.TP
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.B -y
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Disable interactive mode. By default, i2cdump will wait for a confirmation
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from the user before messing with the I2C bus. When this flag is used, it
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will perform the operation directly. This is mainly meant to be used in
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scripts.
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.PP
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At least two options must be provided to i2cdump. \fIi2cbus\fR indicates the
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number of the I2C bus to be scanned. This number should correspond to one
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of the busses listed by \fIi2cdetect -l\fR. \fIaddress\fR indicates the
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address to be scanned on that bus, and is an integer between 0x00 and 0x7F.
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.PP
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The \fImode\fR parameter, if specified, is one of the letters \fBb\fP, \fBw\fP,
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\fBs\fP, or \fBi\fP, corresponding to a read size of a single byte, a 16-bit
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word, an SMBus block, an I2C block, respectively. The \fBc\fP mode is a
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little different, it reads all bytes consecutively, and is useful for chips that
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have an address auto-increment feature, such as EEPROMs. The \fBW\fP mode is
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also special, it is similar to \fBw\fP except that a read command will only
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be issued on even register addresses; this is again mainly useful for EEPROMs.
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.PP
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A \fBp\fP can also be appended to the \fImode\fR parameter (except for
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\fBi\fP and \fBW\fP) to enable PEC. If the \fImode\fR parameter is omitted,
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i2cdump defaults to byte access without PEC.
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.PP
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The \fIbank\fR and \fIbankreg\fR parameters are useful on the W83781D and
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similar chips (at the time of writing, all Winbond and Asus chips).
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\fIbank\fR is an integer between 0 and 7, and \fIbankreg\fR is an integer
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between 0x00 and 0xFF (default value: 0x4E). The W83781D data sheet has more
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information on bank selection.
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.SH WARNING
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i2cdump can be dangerous if used improperly. Most notably, the \fBc\fP mode
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starts with WRITING a byte to the chip. On most chips it will be stored in the
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address pointer register, which is OK, but some chips with a single register
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or no (visible) register at all will most likely see this as a real WRITE,
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resulting in possible misbehavior or corruption. Do not use i2cdump
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on random addresses. Anyway, it is of little use unless you have an idea of
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what you are looking for and have some general knowledge about hardware
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monitoring chips internals.
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.SH CONFORMING TO
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lm_sensors-2.x
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.SH SEE ALSO
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i2cset(8), i2cdetect(8), isadump(8)
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.SH AUTHOR
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Frodo Looijaard, Mark D. Studebaker, and the lm_sensors group
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http://www.lm-sensors.nu/
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This manual page was originally written by David Z Maze <dmaze@debian.org> for
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the Debian GNU/Linux system. It was then reviewed by the lm_sensors team and
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is now part of the lm_sensors source distribution.
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