Dear Sir / Madam,
We are testing with NRF9160 and building on top of k_uptime_ticks, I find the precision of the ticks clock to be ~70 ppm, while testing on my desk. According to the specification. https://docs.nordicsemi.com/bundle/ps_nrf9160/page/pmu_oscillators.html, when the LFXO is enabled, it should be +/- 40 ppm.
In the .config file of the application I find CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y, so the LFXO should be enabled instead of the RC oscillator.
It almost looks like the RC oscillator is driving the k_uptime_ticks instead of the LFXO. Is there a way to verify this?
For the context: The program runs on top of the B0 and MCUBOOT, all having CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=y set.
Kind regards,
Sjors