TWI Stuck Bus Recovery

RE: TWI Stuck Bus Recovery

WestCoastDaz — Mon, 08 Apr 2019 15:35:35 GMT

Nihal You can re-initialize the TWI after every transaction if you are using synchronous transactions but in my opinion, it's not necessary as it's not efficient from a CPU and power perspective.

RE: TWI Stuck Bus Recovery

Nihal — Sat, 06 Apr 2019 14:02:39 GMT

I went through the API & had that doubt. Thanks for clarification. Aslo I'm repeating again, is it safe or fine to re-initialize TWI peripheral before every TWI transaction?

RE: TWI Stuck Bus Recovery

WestCoastDaz — Fri, 05 Apr 2019 15:47:30 GMT

Nihal

Yes, you have to uninitialized reinitialize the TWI driver you else you will get an NRF_ERROR_INVALID_STATE when you init the driver.

RE: TWI Stuck Bus Recovery

Nihal — Fri, 05 Apr 2019 10:27:06 GMT

Hey,

I also have a similar problem for which I need to clear the bus. I'm using nRF52840. My question is do we need to uninitialize and reinitialize or just only reinitialize without uninitialize is sufficient? Also, is it fine to do this re-initialization before every TWI transaction?

RE: TWI Stuck Bus Recovery

bjorn-spockeli — Mon, 24 Apr 2017 06:10:50 GMT

No problem and thanks :)

RE: TWI Stuck Bus Recovery

WestCoastDaz — Fri, 21 Apr 2017 16:52:48 GMT

Bjorn,

Thanks for talking with the developers on this. I had come to the same conclusion but I wanted to make sure that I wasn't missing something.

As always the support at Nordic is awesome!

Thanks, Darren

RE: TWI Stuck Bus Recovery

bjorn-spockeli — Fri, 21 Apr 2017 11:02:27 GMT

Hi Darren,

I discussed this with the developers and their recommendation was to reinitialize the TWI driver.

However, there is an internal twi_clear_busfunction in nrf_drv_twi.c that you could expose and use, but I would recommend the first solution, i.e. reinitialization of the driver.

Best regards

Bjørn