Sharing SPI between CC26xx host and Sensor Controller

sandman008

Hi!

I hope I put this question in the right place.

Is there any possibility to share a spi connection between the host processor and the sensor controller?

Coding in Sensor Controller Studio is not really an option because of a) limited code size and b) no possibility to write functions, which forces me to rewrite the spi transmit function for every command.

Specifically I have got the following questions:

Is it ok if I close my SPI connection on the host and free the csn pin before calling the Sensor Controller application?
When does the sensor controller initialize the SPI pins? Are they released after one execution of the application?

Thank you very much in Advance!

over 11 years ago

0 YiKai Chen over 11 years ago

Guru 735695 points

The problem is how to solve the SPI resource conflict between sensor controller and host processor. SPI can be only controlled by one of them one at a time. If sensor controller and host processor won't use SPI at the same time, it should be no problem. You only need to close SPI after use it and reinitialize it before you use it.

0 sandman008 over 11 years ago in reply to YiKai Chen

Prodigy 110 points

Ok, than I only got one question left, which is at what point the sensor controller is taking over the spi. Is this happening during scifInit() or when scifStartTasksNbl() is called?

0 YiKai Chen over 11 years ago in reply to sandman008

Guru 735695 points

I suppose it is in scifStartTasksNbl().

0 sandman008 over 11 years ago in reply to YiKai Chen

Prodigy 110 points

Ok, thank you very much!

0 YiKai Chen over 11 years ago in reply to sandman008

Guru 735695 points

You are welcome.

0 sandman008 over 11 years ago in reply to YiKai Chen

Prodigy 110 points

In case anybody ever needs this, I just stumbled across it in the driver documentation:

scifTaskResourceInit() initilializes task resource hardware dependencies. This function is called by the internal driver initialization function, scifInit().
scifTaskResourceUninit() uninitilializes task resource hardware dependencies. This function is called by the internal driver uninitialization function, scifUninit().

So I guess the SPI lines are initalized during scifInit() and released after calling scifUninit(), too.

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Sharing SPI between CC26xx host and Sensor Controller