Hey all,
We are developing an application for the NRF9160 but we cant seem to enable the GNSS frontend of the chip.
The lte_lc_init(); call will always fail if we have a modem control mode which includes gps selected (lte_m+gps or just gps)
LOG_INF("Initializing modem");
int err = lte_lc_init();
if (err)
{
LOG_ERR("Failed initialize the modem, err %d\n", err);
return err;
}
[00:00:08.411,926] <err> lte_lc: Could not send AT command, error: 65536
[00:00:08.411,926] <err> lte_lc: Could not set system mode, error: -14
In the trace it shows the following crucial lines:
14 5.760223 AT 21 Sent AT Command: AT+CFUN=4
15 5.760437 AT 16 Rcvd AT Command: OK
16 5.760834 AT 27 Sent AT Command: AT%XSYSTEMMODE?
17 5.760864 AT 39 Rcvd AT Command: %XSYSTEMMODE: 1,0,0,0 OK
18 5.767578 AT 34 Sent AT Command: AT%XSYSTEMMODE=1,0,1,0
19 5.767670 AT 19 Rcvd AT Command: ERROR
SW versions
- MFW : 1.3.6
- NCS : 2.5.1
What we have tried:
- Loading nordic samples to our board same result
- Using modem traces to diagnose the At commands see attached
- Removing LNA enable caps (Overcurrent at enable??)
- Downgraded MFW to 1.3.1 (Not fixed)
- Verified OK VDD voltage
- Dropping modem into offline/flight mode before gps enable (cfun4)
- Verifying the coex0 parameters
- Validated supported hardware revision (B1)
Board hardware files would be available on request but RF side is a direct copy of the 9160DK schematic (same lna and everything)
Trace working! this is without the gps.
Trace not working This is the trace without working gps.
Any tips for debugging this issue further would be appreciated!
Kind regards,
Sh Biezeman
