CC2640: Both Sensorcontroller and Cortex-M3 using ADC

Hello Anders,

Good question. I have not tested this myself yet, but it should be possible.

There are two considerations:

1) PIN sharing and/or configuration.

The TI-RTOS driver use the TI-RTOS PIN driver. If both implementations use the same input pin for the ADC it can cause conflict unless care is taken as the TI-RTOS driver call to ADCCC26XX_open will reconfigure the selected pin. 

2) ADC peripheral sharing through semaphore.

There is a designated hardware semaphore for the AUX ADC (AUX_SMPH_2 in AUX_SMPH). The TI-RTOS driver synchronize on this semaphore in ADCCC26XX_convert(), but you will need to do this manually before you open the TI-RTOS ADC driver if you use the same input pin (as mentioned above). You should also consider to control the sensor controller task (stop/start) in between for better control/overview. Please review the following two sensor controller example projects that show some of these elements:

• "Shared IO Pins"
• "Task Control"

Proposed solution:

Sensor Controller:

Enable the "Peripheral Sharing" in the sensor controller studio project and add:

fwAcquirePeripheral(PERIPHERAL_ADC);
adcEnable()
adcSelectGpioInput();
... ADC Code ...
adcDisable()
fwReleasePeripheral(PERIPHERAL_ADC);

TI-RTOS:

Acquire the ADC semaphore bore you open the driver

AUXSMPHTryAcquire(AUX_SMPH_2);
ADCCC26XX_open
...ADC Code...

and if you use the same input pin, close the TI-RTOS ADC driver, reconfigure the pin for the sensor controller and release the semaphore:

// Close the TI-RTOS ADC Driver
ADCCC26XX_close();

// Hand the ADC input IO pins back to the Sensor Controller
scifReinitTaskIo(BV(SCIF_<ADC_TASK_NAME>_TASK_ID));

/* Release the ADC hw semaphore */
AUXSMPHRelease(AUX_SMPH_2);

Please refer to the implementation in ADCCC26XX_convert from the driver to see how the sempahore is used:

C:\TI\simplelink_cc2640r2_sdk_1_30_00_25\source\ti\drivers\adc\ADCCC26XX.c

Let me know how it works out, I am happy to follow up. I did not test this so there might be some corrections needed.