freertos with wdt reset problem, nrfjprog

Question

Hello 
 my setup is a nrf52840, the sdk15.3, Softdevice s140. 
 I'm running an application with freertos and wdt and have the openbootloader and s140 also flashed. 
 - if in freertos the wdt is disabled and i set the GPREGRET register and make a reset with NVIC_SystemReset, i have to make a reset from outside by nrfjprog -r over jlink and then the dfu device comes up... 
 - and after update the device over dfu it has to be reset by nrfjprog -r and it resetarts in application as wanted 
 - If the wdt is enabled and do the same, set the GPREGRET register and make a reset with NVIC_SystemReset, the device restarts in application.... 
 How can i make a reset or restart similar to nrfjprog -r from software so that no jlink is needed ? 
 
 Thanks in advance 
 twittich

twittich · Accepted Answer

Yes it isn't entering the application there are different alive indicators, if i remove the comments from " _WFE " it restarts the application normal. What did the uncommenting exactly do that the wdt will not time out ? Actual if the wdt is set to 40 seconds, the bootloader inactivity to 0 everything works fine if the dfu update is started immidiatly. ------ Now i set the wdt to 5 secs and do the following and after maximum a minute it makes a restart (maybe the inactivity timeout ?), theoretically it has to stay forever in the dfu mode until the update is started /done. I'll try to write directly in the register and guess it's working. First i fill all regs with 0xffffffff and then with the magic number. thats the first i do in the main of the bootloader and then in the forever loop... NRF_WDT->RR[0] = 0x6E524635UL; NRF_WDT->RR[1] = 0x6E524635UL; NRF_WDT->RR[2] = 0x6E524635UL; NRF_WDT->RR[3] = 0x6E524635UL; NRF_WDT->RR[4] = 0x6E524635UL; NRF_WDT->RR[5] = 0x6E524635UL; NRF_WDT->RR[6] = 0x6E524635UL; NRF_WDT->RR[7] = 0x6E524635UL; And just byside is this correct ? in the file " nrf_bootloader_wdt.c " in function " static void wdt_feed(void) " the for loop " for (nrf_wdt_rr_register_t i = NRF_WDT_RR0; i < NRF_WDT_RR7; i++) " counts up to smaller than " NRF_WDT_RR7 " , i guess it has to be " <= " . Vidar Berg said: inactivity timer expires after 2 minutes by default, where is this timer and where is the 2 minutes set ?

freertos with wdt reset problem, nrfjprog

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