bootloader&wdt

RE: bootloader&wdt

Hung Bui — Wed, 12 Jul 2017 09:13:34 GMT

Hi Yichen,

If you reset the chip (in the application) by the watchdog reset, the GPREGRET register will be erased.

You have two options:

1 - Keep the WDT running, reset using soft reset. Then inside the bootloader you need to feed the dog.

2 - Let the WDT trigger the reset , but then you need to write the flag to enter bootloader mode in flash instead of GPREGRET. This way you don't need to handle the WDT in the bootloader.

RE: bootloader&wdt

yichen — Wed, 12 Jul 2017 06:22:47 GMT

i know in the SDK9.0,i can let it DFU by set the NRF_POWER->GPREGRET =BOOTLOADER_DFU_START(0xb1).and i want to use the same way in sdk12.3,but when i let NRF_POWER->GPREGRET =0xb1,it reset,and start application again,not in dfu mode ..and i test i really write the NRF_POWER->GPREGRET =0xb1,i printf it.(i use sdk12.3,nrf51822-QFAA),the reson is wdt.void

wdt_timeout_handler(void * p_context)
{
	nrf_gpio_pin_toggle(18);
	NRF_WDT->RR[0]=WDT_RR_RR_Reload;
}
#define WDT_INTERVAL			           APP_TIMER_TICKS(1000,APP_TIMER_PRESCALER)

APP_TIMER_DEF(wdt_timer_id);

i test when i not open the wdt, it can dfu ok.the led can togle, means that the timer is work,and then, i open the wdt(#define WDT_CONFIG_RELOAD_VALUE 7000).and then ,wnen i set NRF_POWER->GPREGRET =BOOTLOADER_DFU_START,and then it retart after 7 seconds.do you know the reson ?can you tell me? thank you

RE: bootloader&wdt

Hung Bui — Thu, 02 Mar 2017 15:33:41 GMT

You mean NRF_WDT->RUNSTATUS is not == 1 ? Could you run in debug mode or print out and check what value it is ?

RE: bootloader&wdt

FormerMember — Thu, 02 Mar 2017 14:05:22 GMT

maybe it is not go in this function's If statement

RE: bootloader&wdt

FormerMember — Thu, 02 Mar 2017 14:04:22 GMT

hello friend in the DFU project , i don't set WDT timeout,i only set it in the application project

RE: bootloader&wdt

Hung Bui — Thu, 02 Mar 2017 14:01:55 GMT

You can add a log or toggle an LED pin to see how often it's getting to the code NRF_WDT->RR[0]=WDT_RR_RR_Reload;

RE: bootloader&wdt

FormerMember — Thu, 02 Mar 2017 14:00:34 GMT

first i set it 2000(that mens 2second),and then i set it 5000 in application.. and in the dfu project , i only add two If statement in the static void wait_for_events(void) if(NRF_WDT->RUNSTATUS&0x01) { NRF_WDT->RR[0]=WDT_RR_RR_Reload; }

RE: bootloader&wdt

Hung Bui — Thu, 02 Mar 2017 13:57:59 GMT

How long is your WDT timeout ? If you have the connection interval too long the CPU may not wake up frequently enough to feed the dog.

RE: bootloader&wdt

FormerMember — Thu, 02 Mar 2017 07:34:33 GMT

i use SDK9.0 DFU (DFU-1\examples\dfu\bootloader\pca10028\dual_bank_ble_s110\arm5_no_packs)