| 1 | .TH I2CDETECT 8 "April 2008" |
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| 2 | .SH NAME |
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| 3 | i2cdetect \- detect I2C chips |
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| 4 | |
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| 5 | .SH SYNOPSIS |
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| 6 | .B i2cdetect |
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| 7 | .RI [ -y ] |
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| 8 | .RI [ -a ] |
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| 9 | .RI [ -q | -r ] |
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| 10 | .I i2cbus |
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| 11 | .RI [ "first last" ] |
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| 12 | .br |
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| 13 | .B i2cdetect |
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| 14 | .I -F |
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| 15 | .I i2cbus |
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| 16 | .br |
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| 17 | .B i2cdetect |
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| 18 | .I -V |
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| 19 | .br |
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| 20 | .B i2cdetect |
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| 21 | .I -l |
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| 22 | |
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| 23 | .SH DESCRIPTION |
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| 24 | i2cdetect is a userspace program to scan an I2C bus for devices. It |
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| 25 | outputs a table with the list of detected devices on the specified bus. |
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| 26 | \fIi2cbus\fR indicates the number or name of the I2C bus to be scanned, and |
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| 27 | should correspond to one of the busses listed by \fIi2cdetect -l\fR. |
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| 28 | The optional parameters \fIfirst\fR and \fIlast\fR restrict the scanning |
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| 29 | range (default: from 0x03 to 0x77). |
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| 30 | .PP |
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| 31 | i2cdetect can also be used to query the functionalities of an I2C bus |
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| 32 | (see option \fB-F\fP.) |
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| 33 | |
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| 34 | .SH WARNING |
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| 35 | This program can confuse your I2C bus, cause data loss and worse! |
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| 36 | |
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| 37 | .SH INTERPRETING THE OUTPUT |
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| 38 | Each cell in the output table will contain one of the following symbols: |
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| 39 | .IP \(bu "\w'\(bu'u+1n" |
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| 40 | "--". The address was probed but no chip answered. |
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| 41 | .IP \(bu |
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| 42 | "UU". Probing was skipped, because this address is currently in use by |
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| 43 | a driver. This strongly suggests that there is a chip at this address. |
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| 44 | .IP \(bu |
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| 45 | An address number in hexadecimal, e.g. "2d" or "4e". A chip |
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| 46 | was found at this address. |
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| 47 | |
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| 48 | .SH OPTIONS |
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| 49 | .TP |
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| 50 | .B "\-y" |
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| 51 | Disable interactive mode. By default, i2cdetect will wait for a confirmation |
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| 52 | from the user before messing with the I2C bus. When this flag is used, it |
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| 53 | will perform the operation directly. This is mainly meant to be used in |
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| 54 | scripts. |
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| 55 | .TP |
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| 56 | .B "\-a" |
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| 57 | Force scanning of non-regular addresses. Not recommended. |
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| 58 | .TP |
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| 59 | .B "\-q" |
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| 60 | Use SMBus "quick write" commands for probing (by default, the command |
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| 61 | used is the one believed to be the safest for each address). |
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| 62 | Not recommended. This is known to corrupt the Atmel AT24RF08 EEPROM |
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| 63 | found on many IBM Thinkpad laptops. |
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| 64 | .TP |
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| 65 | .B "\-r" |
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| 66 | Use SMBus "read byte" commands for probing (by default, the command |
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| 67 | used is the one believed to be the safest for each address). |
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| 68 | Not recommended. This is known to lock SMBus on various write-only |
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| 69 | chips (most notably clock chips at address 0x69). |
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| 70 | .TP |
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| 71 | .B "\-F" |
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| 72 | Display the list of functionalities implemented by the adapter and exit. |
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| 73 | .TP |
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| 74 | .B "\-V" |
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| 75 | Display the version and exit. |
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| 76 | .TP |
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| 77 | .B "\-l" |
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| 78 | Output a list of installed busses. |
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| 79 | |
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| 80 | .SH SEE ALSO |
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| 81 | i2cdump(8), sensors-detect(8) |
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| 82 | |
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| 83 | .SH AUTHOR |
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| 84 | Frodo Looijaard, Mark D. Studebaker and Jean Delvare |
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| 85 | |
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| 86 | This manual page was originally written by Aurelien Jarno |
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| 87 | <aurel32@debian.org>, for the Debian GNU/Linux system. |
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