Disable VBUS reset

[hamit]

Hi,

I have designed a hardware with NRF52840 and i connected VBUS pin for future operation. Now i want to disable reset to disable wakeup from SYSoff mode by VBUS rising)

Can i use NRF_POWER -> RESETREAS or any other register exist to detect it ?

Could you please guide to figure out this issue?

Regards,

Hamit

[Håkon Alseth]

Hi,

Unfortunately, VBUS DETECT will give a wakeup condition when the device is system-off:  RE: Wake on VBUS connected but not disconnectedW 

 

Can i use NRF_POWER -> RESETREAS or any other register exist to detect it ?

RESETREAS will reflect the reset source, including if it is from VBUS detect.

 

Kind regards,

Håkon

[hamit]

Hi Håkon,

Thank you for help, below code was ok for my application.

...init main...

.

// If reset caused by VBUS rising/falling edge, ignore and continue sysoff mode
uint32_t resetReason = NRF_POWER -> RESETREAS;
NRF_POWER->RESETREAS = 0xFFFFFFFF; // Clear Reset Flags.
if (resetReason & 0x00100000)
{
 // PREPARE SYSOFF AGAIN
}

.

.

Regards,

Hamit