nRF9160 COEX0 not asserting

RE: nRF9160 COEX0 not asserting

spline_pete — Tue, 23 Feb 2021 20:31:20 GMT

I think I fixed it. I enabled PSM earlier, in modem_configure(). The PSM request no longer gives an error and when gps starts, COEX0 is enabled.

RE: nRF9160 COEX0 not asserting

spline_pete — Tue, 23 Feb 2021 16:31:59 GMT

It's pretty much the stock AGPS sample, so there's no motion support - it just starts a GPS search right away and gets a fix in about 40 seconds.

So it seems LTE vs GPS related. What are the CONFIG settings to ensure they will both function, since this obviously works with the DK and Thingy91?

I have this set in prj.conf:
CONFIG_GPS_CONTROL_PSM_ENABLE_ON_START=y

But in the gps work call, it fails lte_lc_psm_req(true):
<err> gps_control: Error: PSM request failed, -5

RE: nRF9160 COEX0 not asserting

Didrik Rokhaug — Tue, 23 Feb 2021 16:23:19 GMT

[quote user="spline_pete"]If the motion trigger calls gps_control_start(0), then SUPL works, but GPS doesn't. If the motion trigger calls these:[/quote]

[quote user="spline_pete"]then SUPL fails, but GPS does work. If I run the AGPS sample, that works.[/quote]

Does this mean that the COEX0 line is asserting when using the AGPS sample and the modified motion trigger handler?

RE: nRF9160 COEX0 not asserting

spline_pete — Tue, 23 Feb 2021 15:54:07 GMT

From my prj.conf:

# LTE link control
CONFIG_POWER_OPTIMIZATION_ENABLE=y
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y

RE: nRF9160 COEX0 not asserting

Didrik Rokhaug — Tue, 23 Feb 2021 15:51:31 GMT

I take it that you are using the LTE link control (lte_lc) library?

Which network mode have you set in your prj.conf file?

If you haven't set any, it will use LTE-M only by default. If you want GPS support, you must set either CONFIG_LTE_NETWORK_MODE_LTE_M_GPS=y or CONFIG_LTE_NETWORK_MODE_NBIOT_GPS=y

RE: nRF9160 COEX0 not asserting

spline_pete — Mon, 22 Feb 2021 16:47:54 GMT

GPS has worked before, pretty recently. I'm going through the older versions to see what changed. For bsdlib, I'm using the same calls from the asset tracker:

handle_bsdlib_init_ret() -> bsdlib_get_init_ret()

If the motion trigger calls gps_control_start(0), then SUPL works, but GPS doesn't. If the motion trigger calls these:

lte_lc_offline();
lte_lc_system_mode_set(LTE_LC_SYSTEM_MODE_GPS);
lte_lc_normal();
gps_control_start(0);

then SUPL fails, but GPS does work. If I run the AGPS sample, that works.

RE: nRF9160 COEX0 not asserting

Didrik Rokhaug — Mon, 22 Feb 2021 15:47:26 GMT

Hi,

Has it worked on your custom board before?

What has changed since it worked? Your application only, NCS version, modem version, the custom board?

Do you initialize bsdlib manually, or use the carrier_lib?

Best regards,

Didrik