Softdevice assert (id:0x1 pc:1089e info:0x0)

Question

Our product uses non-connectable/undirected advertising, where advertisement packets are sent every 1 minute for 500ms time. For that we are using FreeRTOS timers to start/stop advertisement.The problem is that randomly either right after the advertisement is started or during the advertisement, app_erro_fault_handler() gets called leading to the system reset (id: 0x1 pc: 0x1089e info: 0x0). What might be the cause based on the given program counter or where would be the best place to start looking for the possible cause for the assert? I cannot disclose all the specifics about the product sw/hw due NDA but basically we are using nRF52SDKI v12.10 with S132 v3.0.0. Ble control code is modified by removing all the heart sensor etc. related code and just sending specific advertisement packets.

Sigurd · Accepted Answer

Hi, 
 When updating to a new major SD number, it is required to update the bootloader also. You should do a BL + SD + APP update. See the combination table, and &ldquo;Note 2&rdquo; on this page: https://github.com/NordicSemiconductor/pc-nrfutil#generate . Also note that there is bug in the bootloader copy routine, so you need to add an offset based on the SoftDevice version. See this page . 
 Edit: You will not run into the bug in the bootloader copy routine since S132 v.3.0.0 and v.4.0.5 is the same size (124 kB)

Sami-Pekka Mähönen · Answer

That is correct. All I did was that I changed the clock configuration given when initializing SD from NRF_CLOCK_LF_SRC_XTAL to NRF_CLOCK_LF_SRC_RC. So far, after ~30mins or so, no assert. 
 Edit: After 17 hours of testing, no assert seen. As summary, in the end this was fixed by changing used clock configuration used to initialize soft device in ble_stack_init(). 
 static void ble_stack_init(void) { uint32_t err_code; 
 nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC_RC; 
 // Initialize the SoftDevice handler module. SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, ble_new_event_handler); 
 ... 
 where NRF_CLOCK_LFCLKSRC_RC is: 
 #define NRF_CLOCK_LFCLKSRC_RC {.source = NRF_CLOCK_LF_SRC_RC, \ .rc_ctiv = 16, \ .rc_temp_ctiv = 2, \ .xtal_accuracy = NRF_CLOCK_LF_XTAL_ACCURACY_20_PPM}

Softdevice assert (id:0x1 pc:1089e info:0x0)

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