View source

== Hardware ==
[[Image:NSLU2_I2C_Hardware_modifications.jpg|right|thumb|300px|NSLU2 Hardware modifications]]
[[Image:NSLU2_I2C_test_setup.jpg|right|thumb|300px|Test setup]]
This page shows how to use the internal I2C hardware of the NSLU2. 

=== Hardware modifications ===
The I2C ports are available on the RTC chip on the baseboard. This is an [http://www.intersil.com/data/fn/fn8097.pdf X1205] in an SO-IC package. See data-sheet for connection details.
I used an RJ-45 connector to take the I2C and power out-side. This connector is place next to the network connector. On the base usually a crystal is placed on that location, but I moved it to the bottom of the PCB.    
Note: the RTC has an operating voltage of 3v3. 

== Software ==

The factory firmware does not support anything we want. (ssh gcc etc.) So I upgraded my NSLU2 to [http://www.slug-firmware.net/s-dls.php DebianSlug 3.10 Beta]. I know there is a newer version released, but in that version no gcc compiler is yet available. If you have succesfully flashed this firmware you should as first step turnup your NSLU2, follow instruction on [http://www.nslu2-linux.org/wiki/OpenSlug/InitialisingDisks this] page.  
Be absolutely sure you have turned up your NSLU2 or the following steps will trash it.

install the native compile environment.

<pre>
ipkg install slugos-native
ipkg install libc6-dev
</pre>
This will take a while. If it failes try "ipkg update" first.

===Master===
The NSLU2 is the master on the NSLU2 bus. [http://ymoona.com/wiki/images/d/d2/NSLU2_I2C_test_main_master_v1.c This] code is used to communicate with the PIC microcontroller. 

===Slave===
The PIC is the slave on the bus. The source can be found [http://ymoona.com/wiki/images/5/51/NSLU2_I2C_test_main_slave_v1.c here]

===The end...===
This page will no longer be updated since I blew up the I2C port on the NSLU2.