getting incorrect output using the timer_example_timer_mode example

RE: getting incorrect output using the timer_example_timer_mode example

Nikhil — Thu, 17 Aug 2017 15:15:07 GMT

Thank you very much Jorn. I really appreciate your help.

RE: getting incorrect output using the timer_example_timer_mode example

Jørn — Thu, 17 Aug 2017 15:11:57 GMT

Unfortunately it is practically impossible to generate a 16MHz signal. The best I have found is 8MHz using a timer, PPI and GPIOTE, here. However we cannot guarantee stable and reliable operation, so use it at your own risk.

RE: getting incorrect output using the timer_example_timer_mode example

Nikhil — Thu, 17 Aug 2017 12:34:56 GMT

Thanks Jorn. How can I generate the clock signal of 16 Mhz?

RE: getting incorrect output using the timer_example_timer_mode example

Jørn — Thu, 17 Aug 2017 09:42:29 GMT

Hello Nikhil

I believe the result you see is correct. The example toggles a led on two compare values of the timer. The led then blinks with a frequency of approximately 244 Hz (4,098ms period time on my logic analyzer). This is however NOT the timer frequency of 16 MHz. The timer counts through 65536 values during one LED period. To find the actual timer frequency you take 65536/0,004098 = 15992191Hz, approximately 16MHz as decribed in the example.

Best regards

Jørn Frøysa