POFWARN Example ?

[Tim Clark]

nRF51822

I'm interested in setting up the the POFCON to enable me to get a POFWARN interrupt when the battery voltage drops below 2.7V.

The softdevice is enabled at the time of these calls.

The first two calls are fine - (pof_enable and pof_threshold). But the ClearPending causes an App_Error - err_code = 0x2001 which looks to be an SoC error / SVC handler missing.

err_code = sd_power_pof_enable(POWER_POFCON_POF_Enabled);
APP_ERROR_CHECK(err_code);

err_code = sd_power_pof_threshold_set(POWER_POFCON_THRESHOLD_V27);
APP_ERROR_CHECK(err_code);
	
err_code = sd_nvic_ClearPendingIRQ(POWER_CLOCK_IRQn);
APP_ERROR_CHECK(err_code);

err_code = sd_nvic_SetPriority(POWER_CLOCK_IRQn, NRF_APP_PRIORITY_HIGH);
APP_ERROR_CHECK(err_code);

err_code = sd_nvic_EnableIRQ(POWER_CLOCK_IRQn);
APP_ERROR_CHECK(err_code);

I have defined the POWER_CLOCK_INT Handler as below ...

void POWER_CLOCK_IRQHandler() { LEDState(BLUE_1SEC_BLINK); }

Any suggestions on what I may be doing wrong - or examples that I could reference ?

Thanks ! -Tim

[Tim Clark]

Whoops - I keep forgetting that you've got to use the Event System when using the SoftDevice.

Changed my code to register for Sys Events (glad that the error codes are clear - or I likely wouldn't have found my way there) - and works perfectly ! 2.69V and my RED LED starts blinkin' :-)

err_code = sd_power_pof_enable(POWER_POFCON_POF_Enabled);
APP_ERROR_CHECK(err_code);

err_code = sd_power_pof_threshold_set(POWER_POFCON_THRESHOLD_V27);
APP_ERROR_CHECK(err_code);
	
// Subscribe for Sys events.
err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
APP_ERROR_CHECK(err_code);


static void sys_evt_dispatch(uint32_t sys_evt)
{
    if (sys_evt == NRF_EVT_POWER_FAILURE_WARNING)
	{
		LEDState(RED_1SEC_BLINK);
	}
}