Sync between PWM and SAADC

[shai.c]

Hi,

I'm looking for a basic example to sync PWM pulses with SAADC using software API

There is an example of it?

[Einar Thorsrud]

Hi,

There are a few different options:

• Connect a GPIO input pin to the PWM output pin, and use PPI to trigger SAADC sampling when there is a transition in the PWM signal. This would give you a predictable delay of a few 16 MHz clock cycles which may or may not be a problem. I suspect this is the best option.
• Use the EGU and PPI to trigger the start task for both SAADC and PWM. This would start them at the exact same time, but I suspect this is not what you want in this case (by looking at the image).

[mrono]

I've never tried it, but there is a PWM event called PWMPERIODEND. It seems like this could be used to trigger sampling on each period like in the illustration.