CCS/CC2642R: CC2642R I2C stuck with multiple slave || How to reset I2C driver after it gets stuck

Abhishek Pratap Singh

Part Number: CC2642R

Tool/software: Code Composer Studio

I am using CC2642R with SDK version simplelink_cc13x2_26x2_sdk_3_40_00_02.

I am using 3 Slaves with my SoC on same I2C line. I am using I2C_transferTimeout API for data transfer on I2C bus.

If this API fails my I2C line gets stuck, i.e. to say I am unable to use I2C bus further. After power reset I am able to use the bus again.

I am thinking that if I am able to reset my I2C driver after it gets stuck then it will solve my problem. Please advice on this.

Also if resetting the I2C driver will help, then please help with the steps to do that.

over 5 years ago

0 IUsedToBeARealPerson (M-W) over 5 years ago

TI__Guru 58425 points

Hi A,

First of all, could you share some code on what you are doing? The "I2C_transferTimeout()" API is not supported by the CC2642 as far as I'm aware, are you really using this API (I would not expect the application to compile)?

As for I2C line "get's stuck", could you elaborate on in what sense it get's stuck? For example, I2C status (you could read out the MSTAT register) and how it looks/what happens on the actual line.

As for resetting the I2C HW, the only way to fully reset it as of today (in terms of SW) is to allow the device to enter into standby which will power it down and on again. There is the "reset I2C" register you could potentially use:

http://dev.ti.com/tirex/explore/content/simplelink_cc13x2_26x2_sdk_4_10_00_78/docs/driverlib_cc13xx_cc26xx/cc13x2_cc26x2/register_descriptions/CPU_MMAP/PRCM.html#RESETI2C

You would however likely need to close/open the driver in case there is a miss-match in internal driver state.

0 Abhishek Pratap Singh over 5 years ago in reply to IUsedToBeARealPerson (M-W)

Intellectual 425 points

Hi M-W,

Firstly I would like to correct you that I am not using 1642, but using 2642.

And I didn't thought about reading MSTAT register, I will definitely do that. Thanks for pointing this out.

Also the shared link is probably what I was looking for, I will revert to you after further testing.

Thanks

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CCS/CC2642R: CC2642R I2C stuck with multiple slave || How to reset I2C driver after it gets stuck