RE: Arbitrary PWM Frequency Generation

matt-lionembedded — Thu, 21 Nov 2019 15:51:45 GMT

Hi Kenneth,

Thanks for the response. I did try using the TIMER/GPIOTE/PPI as I mentioned but fundamentally I don't think the resolution I'm looking for is possible with a 16MHz peripheral clock. Summed up by a colleague of mine: 100kHz is 10000ns period, 100.1kHz is 9990ns. That 10ns period difference isn't possible digitally when your CPU clock is 16MHz (= 62.5ns).

RE: Arbitrary PWM Frequency Generation

Kenneth — Thu, 21 Nov 2019 09:25:27 GMT

Take a look at the \nRF5_SDK\examples\peripheral\gpiote project.

It is possible to setup a TIMER to run continuously with auto-clear when the TIMER reach a compare value. You can in addition connect TIMER compare events (by using PPI) to toggle a pin through the GPIOTE peripheral.

Best regards,
Kenneth