HardFault softdevice_handler_init

[Sergy]

Using SD_110 v6 I get a hardfault on the final call to sd_nvic_EnableIRQ(SWI2_IRQn); sd_softdevice_enable before that returns success. Any idea why enabling interrupt could cause hardfault?

int main(void)
{
	
	NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
	NRF_CLOCK->TASKS_HFCLKSTART = 1;
	while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) {};
	NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
	
	 //uint32_t err_code;

    // Initialize the SoftDevice handler module.
    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_SYNTH_250_PPM, false);
}

[Susheel Nuguru]

what is the priority of the interrupt? Make sure it is APP_LOW or APP_HIGH, anything else will cause unpredictable behavior. use SD_EVT_IRQn define for compatibility.

err_code = sd_nvic_SetPriority(SD_EVT_IRQn, NRF_APP_PRIORITY_LOW);
APP_ERROR_CHECK(err_code);
err_code = sd_nvic_EnableIRQ(SD_EVT_IRQn);
APP_ERROR_CHECK(err_code);

[Sergy]

SD_EVT_IRQ2.

The error code i get is 2009 which is NRF_ERROR_SOC_PPI_INVALID_GROUP.

Not sure why PPI is a problem?

[Susheel Nuguru]

I searched all the header files and only four functions in nrf_soc.h can generate this error. All four functions are SVC calls to softdevice with sd_xx signature. Either your debugger is not showing you whats really happening or there is some serious undocumented thing that is happening here. How are you debugging? all optimization set to level zero?

[Sergy]

There was something weird going on, i upgraded sdk to 6.1 and SD to 7.0 and now it works without a problem.

[Susheel Nuguru]

good that it went away, that has a smell of a bug in SD if your debugger is showing right information.