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UCM-iMX95 Yocto Linux: I2C - Revision history
2026-04-15T08:00:35Z
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Igor: Created page with "<!-- The following I2C buses and devices are present: {| class="wikitable" style="text-align:center;" |- | '''Device''' || '''I2C bus in Linux''' || '''Address''' || '''HW por..."
2025-01-09T15:54:43Z
<p>Created page with "<!-- The following I2C buses and devices are present: {| class="wikitable" style="text-align:center;" |- | '''Device''' || '''I2C bus in Linux''' || '''Address''' || '''HW por..."</p>
<p><b>New page</b></p><div><!--<br />
The following I2C buses and devices are present:<br />
{| class="wikitable" style="text-align:center;"<br />
|-<br />
| '''Device''' || '''I2C bus in Linux''' || '''Address''' || '''HW port in UCM-iMX95''' <br />
|-<br />
|user I2C on connector [[UCM-iMX95: Evaluation Kit: Hardware Guide#Connector_Locations | P16]]<br> pins: 3-sda, 5-scl<br />
|5<br />
|NA<br />
|I2C6<br />
|-<br />
|}<br />
--><br />
To list all buses run:<br />
i2cdetect -l<br />
<br />
To inspect a bus run:<br />
<pre><br />
i2cdetect -y 1<br />
0 1 2 3 4 5 6 7 8 9 a b c d e f<br />
00: -- -- -- -- -- -- -- -- <br />
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <br />
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <br />
30: -- -- UU -- -- -- -- -- -- -- -- -- -- -- -- -- <br />
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <br />
50: UU UU UU UU -- -- -- -- -- -- -- -- -- -- -- -- <br />
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- <br />
70: -- -- -- -- -- -- -- -- <br />
</pre><br />
UU marks a device that is used by a driver, while numbers mark unused devices<br />
<br />
To inspect a device at i2c address 0x50 run:<br />
cat /sys/bus/i2c/devices/1-0050/uevent<br />
<br />
We see that this is an EEPROM.<br />
<br />
An example of how to dump EEPROM contents:<br />
hexdump -C /sys/bus/i2c/devices/1-0050/eeprom<br />
<br />
[[Category:Linux]]<br />
[[Category:Yocto]]<br />
[[Category:UCM-iMX95]]</div>
Igor