Interaction between timer and saadc

RE: Interaction between timer and saadc

CktDesigner — Tue, 04 May 2021 03:41:04 GMT

Pilot error - I used NRF_GPIO_PIN_MAP(0,5) as the input to the SAADC channel configuration instead of NRF_SAADC_INPUT_AIN3.

Sorry for the inconvenience...

RE: Interaction between timer and saadc

CktDesigner — Mon, 03 May 2021 15:42:07 GMT

Some additional information: saadc_init (see above) really only has two actions: initializing the saadc block and initializing the individual input channel.

If I comment out the initialization of the individual channel, then the buzzer (using timer 3) works.

So the initialization of the actual saadc block seems to be OK.

The individual ADC input is using Pin P0.05 (AIN3)

The buzzer output is using Pin P0.28 (AIN4) configured as an Output. Is there some rule that I'm missing about not using the Analog pins for normal GPIO outputs when using other Analog pins as inputs to SAADC?

RE: Interaction between timer and saadc

CktDesigner — Mon, 03 May 2021 13:48:30 GMT

Yes, I'm building in the "Debug" configuration. No asserts are thrown.

I don't see anything in the saadc_init() function that should interact with the timer...

RE: Interaction between timer and saadc

Kenneth — Mon, 03 May 2021 11:43:52 GMT

[quote user=""]When the "saadc_init" function executes, the tone generation no longer works.[/quote]

Are you sure the code is not asserting? If you build with Debug (not Release) you may get more information about the assert in app_error_fault_handler().