Prevent sd_app_evt_wait from wakeup

RE: Prevent sd_app_evt_wait from wakeup

bloobird0 — Mon, 14 May 2018 15:19:44 GMT

hello,

I added the code from the errata that you sent me and it looks to solve my issue, I have to test further but from what I see now it looks very good, thank you very much!

Yes some operation on float values are executed in the code.

RE: Prevent sd_app_evt_wait from wakeup

Vidar Berg — Mon, 14 May 2018 08:38:42 GMT

Thanks for confirming, so it sounds like there is a pending interrupt that prevents the CPU from entering sleep, but not sure why it only happens when the softdevice is enabled . Do you have any floating point instructions in your code? In that case you should implement the workaround for errata 87: http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.Rev2.errata/dita/errata/nRF52832/Rev2/latest/anomaly_832_87.html?cp=2_1_1_0_1_24.

RE: Prevent sd_app_evt_wait from wakeup

bloobird0 — Mon, 14 May 2018 08:19:26 GMT

yes, the program passes the ble_stack_init() and yes sd_app_evt_wait() is called in the main loop.

I can advertise, connect, read/write characteristics.... it's just that the µC does not stay in low power mode and leaves sd_app_evt_wait(), I don't know how to find the wakeup reason.

The clock assignment is the following:

#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_RC , \
.rc_ctiv = 16, \
.rc_temp_ctiv = 2, \
.xtal_accuracy = 0} ///ignored when using LF RC

nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

// Initialize SoftDevice.
SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

RE: Prevent sd_app_evt_wait from wakeup

Vidar Berg — Mon, 14 May 2018 08:11:24 GMT

Hello,

Does the program get past ble_stack_init() and are you calling sd_app_evt_wait() from the main loop? Remember that you must specify what LF source to use when you call sd_softdevice_enable().

Best regards,

Vidar