Setting LFXODEBOUNCE for nRF52833 in Zephyr

Question

Hi 
 For use of the nRF52833 above 85 °C, the documentation states that the register LFXODEBOUNCE must be set to 'Extended'. In an earlier support thread , it was discussed how to do this using the nRF5 SDK. 
 What is the recommended way to configure this when using nRF Connect SDK / Zephyr?

Håkon Alseth · Accepted Answer

Hi, There is unfortunately no setting for this in the nrf_rtc_timer for the zephyr tick, but you can override this by adding a routine like this: #include #include static int lfclk_lfxodebounce_set(void) { NRF_CLOCK->LFXODEBOUNCE = (CLOCK_LFXODEBOUNCE_LFXODEBOUNCE_Extended << CLOCK_LFXODEBOUNCE_LFXODEBOUNCE_Pos); return 0; } SYS_INIT(lfclk_lfxodebounce_set, EARLY, 0); For instance to your board file (the most correct approach), or just directly in the project itself. For debugging purposes, I just added this as a .c file to the hello_world and verified that the function occurred before nrf_rtc_timer.c::sys_clock_driver_init() was called and that the register was indeed set correctly after boot: (gdb) print (NRF_CLOCK_Type)*0x40000000 $2 = {TASKS_HFCLKSTART = 0, TASKS_HFCLKSTOP = 0, TASKS_LFCLKSTART = 0, TASKS_LFCLKSTOP = 0, TASKS_CAL = 0, TASKS_CTSTART = 0, TASKS_CTSTOP = 0, RESERVED = { 0 }, EVENTS_HFCLKSTARTED = 0, EVENTS_LFCLKSTARTED = 0, RESERVED1 = 0, EVENTS_DONE = 0, EVENTS_CTTO = 0, RESERVED2 = {1, 1, 0, 0, 0}, EVENTS_CTSTARTED = 0, EVENTS_CTSTOPPED = 0, RESERVED3 = {0 }, INTENSET = 0, INTENCLR = 0, RESERVED4 = {0 , 1, 4294967295}, HFCLKRUN = 0, HFCLKSTAT = 65536, RESERVED5 = 0, LFCLKRUN = 1, LFCLKSTAT = 65537, LFCLKSRCCOPY = 1, RESERVED6 = {0, 0, 15, 4294967295, 1, 0 , 4294967295, 0, 0, 0, 1048577}, LFCLKSRC = 1, RESERVED7 = {0, 0, 3}, HFXODEBOUNCE = 16, LFXODEBOUNCE = 1, RESERVED8 = {0, 0}, CTIV = 0, RESERVED9 = {3, 39, 0, 0, 1, 4294967295, 3, 90}, TRACECONFIG = 0} Kind regards, Håkon

Setting LFXODEBOUNCE for nRF52833 in Zephyr

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