PCA20035 Antenna Tuning RF Switches

RE: PCA20035 Antenna Tuning RF Switches

Andreas — Thu, 12 Sep 2019 11:43:12 GMT

Hi,

[quote user="MJD093"]I have noticed that the "Using:" section of the satelite stats now seems to be accurately reporting how many satelites the device is using from the ones tracked. Is this a new feature of the 1.0.1 modem firmware?[/quote]

Yes, it seems there was a small fix to this with the 1.0.1 release.

Best regards,

Andreas

RE: PCA20035 Antenna Tuning RF Switches

MJD093 — Thu, 12 Sep 2019 11:31:36 GMT

Hi Andreas,

The rain held off long enough to get a fix after ~115 seconds (it is now pouring down). Thanks for the help getting the GPS tuning correct.

I have noticed that the "Using:" section of the satelite stats now seems to be accurately reporting how many satelites the device is using from the ones tracked. Is this a new feature of the 1.0.1 modem firmware?

I can't remember ever seeing this field of the print_satellite_stats() function ever working in the past with the PCA10090 board and the firmware I'm using is a stripped down version of a larger application I'm building for a custom nRF91 board.

RE: PCA20035 Antenna Tuning RF Switches

Andreas — Thu, 12 Sep 2019 11:20:03 GMT

Hi,

Alright, cool. The one satellite is indeed promising, it should be an indication that the command is correct as finding satellites while indoors is quite challenging in itself.

Best regards,

Andreas

RE: PCA20035 Antenna Tuning RF Switches

MJD093 — Thu, 12 Sep 2019 10:54:24 GMT

Hi Andreas,

Thanks for the information, I will flash these AT commands and test the GPS response (once it stops raining 😅). Already found one satelite while inside a structure so that's promising.

RE: PCA20035 Antenna Tuning RF Switches

Andreas — Thu, 12 Sep 2019 08:56:37 GMT

Hi,

No, the correct commands would be

AT%MAGPIO=1,1,1,1,5,791,849
AT%MAGPIO=1,1,1,1,7,1574,1577

The first three 1s are to instruct the modem that all MAGPIOs are used, even if the pin is low it is in use. The 4th '1' is to instruct how many different states there are in total, if you plan on using both these commands in the same application (without potentially erasing the previous setting) this should be 2. The 5 and the 7 instruct which of the state the two following band limits shall be used for. Which state maps to which combination of MAGPIOs is described in the AT command description.

You can also set both in one command by sending

AT%XMAGPIO=1,1,1,2,5,791,849,7,1574,1577

Best regards,

Andreas

RE: PCA20035 Antenna Tuning RF Switches

MJD093 — Wed, 11 Sep 2019 14:37:03 GMT

Hi Andreas,

So your saying that the above examples I gave:

NB-IoT B20 AT%XMAGPIO=1,0,1,1,791,849

GPS AT%XMAGPIO=1,1,1,1,1574,1577

would be the appropiate ways to initialise the modem for a PCA20035 v1.0.0 device?

RE: PCA20035 Antenna Tuning RF Switches

Andreas — Wed, 11 Sep 2019 14:18:07 GMT

Hi,

This format (pre-v0.7.1 og the AT command reference document) of the %XMAGPIO command you have to pile out a lot of bands like this as the order determines the state. This means what is really written:

AT%XMAGPIO= MAGPIO0_enable, MAGPIO1_enable, MAGPIO2_enable, state000_low, state000_high, state100_low, state100_high, state010_low, state010_high, state110_low, state110_high, state001_low, state001_high, state101_low, state101_high, state011_low, state011_high, state111_low, state111_high

where

state000_low is the lower edge of the band which shall have the 000 state
state000_high is the upper edge of the band which shall have the 000 state
state100_low is the lower edge of the band which shall have the 100 state
state100_low is the lower edge of the band which shall have the 100 state

etc.

Whichever states are not used, in Thingy91 the 000 state and 011 state, you assign 'dummy' bands (bands that will never be used) to these.

The new format allows you to skip the unused states, or set a single state in a command, see this link.

Best regards,

Andreas