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disabling sensor controller

Harvey Ku97
Prodigy 140 points

Hi,

I have a sensor controller task that uses SPI to sample sensor data periodically.  However, my application is also sharing the SPI bus for another IC.  To avoid clashing the SPI bus, I will need to disable/stop/pause the sensor controller task from using the SPI while my application uses the SPI bus occasionally.  What is the proper way to pause and resume a sensor controller task from utilizing the SPI bus?  I have tried the following without much luck; scifAdxlOnScStopRtcTicks(),  sciUninit() and scifStopTasksNbl().

Thank You

  • 0
    TI__Guru** 106705 points
    Hi Harvey,

    Have you remembered to also reconfigure the IOs?

    Cheers,
    Fredrik
  • 0
    TI__Mastermind 29650 points

    Harvey,

    What you are trying to do is not straightforward as the Sensor Controller drivers has no support for switching the pins back and forth between AUX and the MCU domain + pin handling is not integrated with the TI RTOS PIN driver.

    I think the simplest thing would be not let the Sensor Controller know that you route the pins back to the MCU domain and then route them back again before using the Sensor Controller task again.

    scifStopTasksNbl //Stop the SPI task
scifWaitOnNbl // Wait for the task to stop.
scifResetTaskStructs // Reset all the task structures
scifStopRtcTicks // Stop RTC channel 2 used by the sensor controller
scifTaskResourceUninit // Modify driver (remove static) to restore the pins back to default values defined in Sensor Controller Studio
...
SPI_open  // Reconfigures pin to SPI module, opens SPI driver
SPI_transfer // Use SPI module..
SPI_close // Close SPI module, restores pins back to what was set by PIN_init
...
scifTaskResourceInit //Route pins back to AUX domain to let them be controlled by the Sensor Controller
scifStartTasksNbl // Start task again
scifStartRtcTicksNow // Re-start RTC channel 2

    Regards,
    Svend

  • 0 in reply to svendbt
    Prodigy 140 points
    That solved it. Thank You.