Another NRF51822 Watchdog question.

RE: Another NRF51822 Watchdog question.

KPE — Sat, 15 Feb 2014 10:07:15 GMT

@jldewitt: Thanks this works for me - I also had the issue with the WDT never generating a timeout event. I think I have the first chip revision, which might be the reason it didn't work with the standard examples.

RE: Another NRF51822 Watchdog question.

John — Mon, 04 Nov 2013 14:46:34 GMT

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-&gt;CRV = 32768 * 4; 	 
NRF_WDT-&gt;RREN |= WDT_RREN_RR0_Msk;									

NRF_WDT-&gt;TASKS_START = 1; // Watchdog start

}

RE: Another NRF51822 Watchdog question.

Stefan Birnir Sverrisson — Mon, 04 Nov 2013 09:46:46 GMT

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.

RE: Another NRF51822 Watchdog question.

Brian Acock — Mon, 04 Nov 2013 00:42:42 GMT

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

RE: Another NRF51822 Watchdog question.

John — Wed, 30 Oct 2013 13:07:20 GMT

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.

RE: Another NRF51822 Watchdog question.

Stefan Birnir Sverrisson — Wed, 30 Oct 2013 09:31:56 GMT

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