Is there a cycle clock counter in the NRF51822?

[Dan Danknick]

I would like to profile some code execution time (moving between floating point and fixed point arithmetic). On the last Cortex-M3 I used, we had the DWT_CYCCNT register at 0xE0001004 that incremented at the CPU clock. It was perfect for this.

Is there an equivalent on the Nordic CPU?

Thank you, Dan

[suktan]

Hi,

I think we can use on-chip hardware timer/RTC instead. Do you use SoftDevice during profiling?

[Dan Danknick]

Yes I am running the SoftDevice and my code runs at 100Hz through the app_timer() scheduler.

[Ole Morten]

There is unfortunately no direct cycle counter in the nRF51822, so this is something you'll have to implement yourself, either with one of the 16 MHz timers, or by doing GPIO toggling.