NCS 3.2.1 LPCOMP init failed (NCS 3.2.1, nrfx 4.0.1)

[S MOUNZEO]

Hi everyone,

For mthe prject I'm working I must use the LPCOMP module to detect a cross. but anytime a init the LPCOMP module my code seems to freeze and nothing else happen. So it put a check inside and my code just loop since the init is never true.

prj.conf

CONFIG_NRFX_LPCOMP=y

CHIP_ERROR AppTask::InitLPCOMP()
{
	
	nrfx_lpcomp_config_t cfg = NRFX_LPCOMP_DEFAULT_CONFIG(NRFX_ANALOG_EXTERNAL_AIN3);
    
    cfg.reference = NRF_LPCOMP_REF_SUPPLY_9_16;    //
    cfg.hyst = NRF_LPCOMP_HYST_ENABLED,// NRF_LPCOMP_HYST_50mV; 
    cfg.interrupt_priority = NRFX_DEFAULT_IRQ_PRIORITY;
    cfg.detection = NRF_LPCOMP_DETECT_CROSS;       // permet UP et DOWN

    int err = nrfx_lpcomp_init(&cfg, (nrfx_lpcomp_event_handler_t)LPCOMP_Handler);

	while( nrfx_lpcomp_init_check() != true)
	{
		nrf_gpio_pin_toggle(SbgGpio2);
		k_usleep(10);
	}	
	
	nrfx_lpcomp_start( NRF_LPCOMP_INT_READY_MASK | NRF_LPCOMP_INT_CROSS_MASK, 0 );

    return CHIP_NO_ERROR;
}

If anyone can provide some help.

Thanks.

[Vidar Berg]

Hi,

The comp_trigger_pin is a regular GPIO output that I connected to the Comparator input to trigger th comparator threshold event. How are you triggering the comparator when you are not using this trigger signal?

S MOUNZEO said:

it seems that if I connect "comp_trigger_pin" to any Pin of Port 1 ( any of the AIN pins) t

You must connect it to the AIN pin you've assigned to the comparator. I used AIN4 (P1.11) in my sample. 

[S MOUNZEO]

It's working fine, I guess i just got some dead pins on my board. 

Thanks a lot for your support