Delay in Turning on of COEX0 and MAGPIO pins during gps

[mnjLC]

Hello Nordic team,

Currently we are developing with the latest Serial LTE Modem FW and modem core firmware which is available on Quick Start.

We see that the COEX0 and MAGPIO do not swtch on ( go high ) as soon as GPS is turned on. It takes 2 minutes and 6 seconds for the MAGPIO and COEX0 pinf to go high. We have followed the below AT commands.

at%xmagpio?

%XMAGPIO: 1,1,0,3,1,698,960,3,1574,1577,1,1710,2200

OK

AT%XCOEX0?

%XCOEX0: 1,1,1565,1586

OK
at%xsystemmode?

%XSYSTEMMODE: 1,1,1,3

OK
at%xsystemmode=0,0,1,0

OK
AT+cfun=31

OK
at#xgps=1,0,0,0

OK

#XGPS: 1,1
at+cfun=31

OK
at#xgps=0

OK

#XGPS: 1,0

at#xgps=1,0,0,0

OK

#XGPS: 1,1
at+cfun=31

OK

Can someone from Nordic try it on their end and report back their results? We are seeing this issue on both the NRF9161 DK and a custom bord design with NRF9151 on it.

Thanks!

Thanks!

[Håkon Alseth]

Hi,

 

Thank for explaining the scenario and sharing sequence/code for reproducing the scenario.

I can confirm that this is the expected behavior of the MAGPIO/COEX pins when they're configured for GNSS (GPS) operation on mfw v2.

The GNSS is receiving for a small period of time, within a given interval, before offline processing is performed before the pattern again repeats. This will occur until a fix is obtained, or a timeout period has expired, where it switches to a higher RX duty cycle.

 

Kind regards,

Håkon