I checked our project's wiki, and oddly I don't see the PRU calling
conventions documented there anymore. Here's the jist of it:
--all registers are to be preserved upon exit from a functions (besides
the retval registers)
--the stack grows downwards.
If you have any other questions about the code, feel free to ask!
On Thursday, January 2, 2014 1:04:57 AM UTC, Christopher Hopwood wrote:
>
> Here it is:
>
> https://github.com/mcdonamp/RH_ROBO_Quadcopter/blob/master/i2c_bitbang/pru_sw/example_apps/control_alg/imu.p
>
> I wrote it so we could communicate with an MPU6050 IMU via PRU for part of
> my senior design project. It's a little rough, and was programmed with the
> MPU6050 in mind, and has been only tested with that IMU and a TMP101, so
> YMMV.
> It supports single byte reads and single byte writes to addresses at a
> time. It doesn't support reading multiple bytes, clock stretching, doesn't
> really wait for an ACK, and I'm sure I ignored a few other features of i2c.
>
> Take a look at conventions.hp as well. I made up my own conventions for
> calling the functions since I couldn't find any established calling
> conventions for the PRU. The calling conventions are also documented
> (though slightly out of date, there are now more arg and ret val registers).
>
> On Tuesday, December 31, 2013 1:58:02 AM UTC, liyaoshi wrote:
>>
>> Ti i2c master up 2 3.4Mbps
>>
>> And with Bitbang ,what ever with ARM or PRU, I dont think you can get so
>> high speed .
>>
>>
>> 2013/12/31 Andrew Dai <[email protected]>
>>
>>> I am eagerly awaiting your link :)
>>>
>>>
>>> On Tuesday, October 22, 2013 1:10:17 AM UTC-4, Christopher Hopwood wrote:
>>>>
>>>> I stopped trying to utilize the i2c modules and just bitbanged it
>>>> myself. If you need i2c bitbanging on the PRU, I can drop the link to the
>>>> git for it tomorrow.
>>>
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>>
>>
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