RTOS/LAUNCHXL-CC2640R2: Want to support SMBUS while using TI-RTOS I2C Driver

Hara Honnappa

Tool/software: TI-RTOS

Hello!

I'm trying to communicate with a SMBUS enabled device using the I2C lines available on the Launchpad. Can I use the existing I2C driver to perform simple single byte read or do I need to write a new one? If I need to write a new one how do I go about it? Can I combine the non-RTOS approach with the TI-RTOS..?

Thanks in advance!

over 6 years ago

0 TER over 6 years ago

TI__Guru**** 317180 points

You either have to use TI-RTOS or use noRTOS. Why do you want to combine a non-RTOS approach with TI-RTOS and what do you mean by that?

As I understand the driver you can do a single byte read.

0 Hara Honnappa over 6 years ago in reply to TER

Prodigy 130 points

My main concern is whether the existing driver is compatible with SMBUS? I'm guessing it isn't. In which case, I will have to write a driver. So that would mean I would have to directly access the registers in my code (non-rtos approach). Is my thinking correct on this?

0 TER over 6 years ago in reply to Hara Honnappa

TI__Guru**** 317180 points

I get the impression from www.ti.com/.../sloa132.pdf that some I2C modules can be compatible with SMBUS. I'm trying to find out if that is the case with the I2C module on CC2640R2. Have you looked into this?

0 Hara Honnappa over 6 years ago in reply to TER

Prodigy 130 points

Thank you! I have looked at this and the use case is slightly different in my case. I'm trying to connect to an SMBUS slave from an I2C Master but regardless, single byte read should be fine. I tried using the I2C driver once (hastily) but it failed (bus fault). I'll test it again after connecting up to a logic analyser.

0 TER over 6 years ago in reply to Hara Honnappa

TI__Guru**** 317180 points

I have not managed to identify any SMBUS experts that at the same time knows the I2C module on CC13xx/ CC26xx. Please let me know how the testing goes.

0 Hara Honnappa over 6 years ago in reply to TER

Prodigy 130 points

Sorry I couldn't reply sooner! I finally managed to test the SMBUS IC with the TI driver and there was no issue with reading data from the IC. I did manage to write my own driver but I will ditch that and use TI's because it's definitely better than mine :) Thanks for all the help!

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RTOS/LAUNCHXL-CC2640R2: Want to support SMBUS while using TI-RTOS I2C Driver