Re: [oc] documentation for simple_i2c

[Richard Herveille <richard@asics.ws>]

Hi Ryan,

Sorry there is no documentation for the simple_i2c_controller, nor the 
tst_ds1621.vhd file.

The basics you can find in the wishbone_i2c_master documentation. The 
wishbone i2c-master is based on the simple_i2c_controller, though it is 
much more mature.
Just as the wishbone_i2c_master, the simple_i2c_controller uses a 4xFscl 
clock internally. So for a 100KHz clock you would program it to 400KHz (see 
the tst_ds1621.vhd) file. It also uses the same command structure.

I think the tst_1621.vhd file is pretty well self-explaining. It is 
basically a statemachine which controls the simple_i2c_controller, it reads 
the temperature from the dallas device and stores it into a register. In my 
hardware test (yes I actually build it) I connected two 7-segment displays 
to show the temperature read (in hex-format).

Richard


>Howdy all,
>
>I'm looking at the simple i2c controller and the dallas 1621 temp sensor
>interface that's in the complete i2c controller download.  I found
>documentation for the complete controller.  complete with the wishbone
>interface.  However, I'm thinking the simple controller is alot more suited
>to my project.  In fact, I was pretty surprised when I found the
>tst_ds1621.vhd file after I had added the same exact sensor to my board.
>
>My question is:  is there any documentation on these pieces of code?  If
>not, that's alright.  Maybe somebody can help me with what it's expecting
>for a clock.  For 100kHz normal mode do I need the input clock to be 100kHz.
>
>BTW if anyone is interrested, you can look at my senior project presentation
>at:
>http://internet.oit.edu/~hendersr/Presentation.ppt
>
>
>Ambitious at OIT
>-Ryan
>
>
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