• LFCLK related issues in SDK14 DFU

    In SDK13, the initialisation of the low frequency clock used to be done within sd_softdevice_enable . In the SDK14 version of nrf_dfu.c , the LF-clock is already initialized in nrf_dfu_init before the softdevice is started. It would make sense…
  • What low-frequency clock sources can I use?

    When initializing the S110 softdevice, I can choose between the different clock sources as defined by the nrf_clock_lfclksrc_t enum: /**@brief Possible lfclk oscillator sources. */ enum NRF_CLOCK_LFCLKSRCS { NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM, /…
  • Errata 146 of nRF52832

    Hi all According to errata 146 of the nRF52832 Rev 1 errata sheet V1.5, the LFRC oscillator has a frequency tolerance of 500ppm instead of 250ppm. What are the consequences of this errata regarding the BLE stack? Does this mean that the LF RC oscillator…
  • LFCLK timer slows to a crawl

    I have a program which uses two timers to flash an LED, alternating between flashing once every 5s for 15s, then once every 0.25s for 15s. If I run this on the nRF52-DK with the external LFCLK, it works fine (15 hours and counting). If I run this…
  • lfclk initialization trouble when switching between ble and esb

    Hello, In my application I want to switch between using bluetooth low energy and enhanced shockburst (esb). I have tried using the timeslot api to run both of them together, but although it works very well, waiting for available timeslots severely…
  • LFCLK: The interrupt that never came.

    I'm doing a more complex application than what I'm showing here, but I've reduced it to the minimum. I'm initializing the RTC subsystem, creating a timer, and starting that timer. I have the S130 SoftDevice installed on my nRF51422 DK board (Nordic…
  • Wakeup immediately from sd_app_evt_wait() with external LFCLK

    Hi all We use the nRF51822 with the S130 V1.0.0. Our application initializes the TIMER2 (f = 16MHz) with a EVENTS_COMPARE interrupt on the CC channel 1 to monitor some timings. Afterwards the SoftDevice is enabled with the LFCLK source "NRF_CLOCK_LFCLKSRC_XTAL_20_PPM…
  • Is it OK to use the internal LFCLK clock source for SD?

    Seems like SD will use RTC0, so if I use the "Synthesized from HFCLK" as a clock source, the SD will work well?