Another NRF51822 Watchdog question.

[John]

Hello,

I have been attempting to get the watchdog timer working in my project without any success. I have read through all of the watch dog related threads that I could find in the forums. I made sure to pin reset and power cycle the board after quitting the debugger. I made sure that I am not configuring the WDT to run while halted etc.

I have a fairly simple function to configure and start the WDT, and I have commented out the line of code in my main loop that reloads the WDT but it never resets.

I am running the 5.2.0 version of the SDS on silicon revision QFAACA. I'll put my WDT configuration function below. Any thoughts on what I am doing wrong will be appreciated.

Regards, John DeWitt

void watchDogInit(void) { NRF_WDT->CONFIG = (WDT_CONFIG_SLEEP_Run << WDT_CONFIG_SLEEP_Pos) | (WDT_CONFIG_HALT_Pause << WDT_CONFIG_HALT_Pos);

NRF_WDT->CRV = 32768; 	 
NRF_WDT->RREN |= WDT_RREN_RR0_Msk;									

NRF_WDT->TASKS_START = 1; // Watchdog start

}

[Stefan Birnir Sverrisson]

Hi

I have attached a watchdog example that should work with the S110 softdevice. I also attach an example that shows watchdog working without the softdevice. Instructions on how to operate those examples are given at the top of the main file in both examples.

watchdog_example.zip

ble_app_template_with_watchdog.zip

[John]

Thanks, the comment was helpful as I did not realize that merely flashing would set the debug mode. I can infer that the watchdog is working using a sniffer. My application advertises every 20mS for the first 30 seconds after power up and then enters a mode where it advertises every ~600mS in 5 second bursts with periods of sleep in between. Power cycling the device after programming shows the device never enters the slow advertising mode with the watchdog reload commented out.

[Brian Acock]

I can't get the watchdog to work at all on my NRF51822 device, using the sample code from above.

[Stefan Birnir Sverrisson]

The sample code is ported for the nRF51822 development kit. Are you using the nRF51822 development kit or the nRF51822 evalutaion kit. The evaluation kit has different mapping of leds and buttons so if you try to run it directly on the evaluation kit you will not see anything work. You will have to modify the pin mapping for the leds and buttons to work with the nRF51822 evalutation kit. I have tested this with S110 softdevice 5.2.1 and the nRF51822 SDK v4.4.1. Remember to read and follow the comments in the main file in the examples.

[John]

I am running on our custom PCB with the nRF51822. There are no LEDs or buttons connected to the radio. The code below works for me to have a 4 second watch dog timer:

/**@brief Initialize the watch dog timer */ void watchDogInit(void) { NRF_WDT->CONFIG = (WDT_CONFIG_SLEEP_Run << WDT_CONFIG_SLEEP_Pos) | (WDT_CONFIG_HALT_Pause << WDT_CONFIG_HALT_Pos);

NRF_WDT->CRV = 32768 * 4; 	 
NRF_WDT->RREN |= WDT_RREN_RR0_Msk;									

NRF_WDT->TASKS_START = 1; // Watchdog start

}