Hello,
I'm looking for a little clarification on how the antenna tuning circuitry works on the Thingy:91 v1.0.0 board.
From a previous topic on the DevZone, I saw that one user was able to get the GPS on the PCA20035 board working by removing the XMAGPIO command from the GPS sample application.
https://devzone.nordicsemi.com/f/nordic-q-a/50457/thingy-91/201867#201867
I now have my own Thingy:91 and want to be able to configure it for B20 LTE and then GPS. From the board-nonsecure.c file in the device tree I can see that the following AT command is flashed with my firmware to the device.
#define AT_CMD_MAGPIO "AT%XMAGPIO=1,1,1,450,451,746,803,698,748," \ "824,894,880,960,1710,2200,791,849,1574,1577"
This then shows up in the post-boot COM port information:
SPM: NS image at 0xc000
SPM: NS MSP at 0x20024ac8
SPM: NS reset vector at 0x1517d
SPM: prepare to jump to Non-Secure image.
***** Booting Zephyr OS v1.14.99-ncs2 *****
[00:00:00.287,994] <dbg> board_nonsecure.leds_init: LEDs initialized
[00:00:00.301,422] <dbg> board_nonsecure.pca20035_magpio_configure: AT CMD: AT%XMAGPIO=1,1,1,450,451,746,803,698,748,824,894,880,960,1710,2200,791,849,1574,1577
[00:00:00.316,101] <dbg> board_nonsecure.pca20035_magpio_configure: AT RESP: OK
[00:00:00.323,425] <dbg> board_nonsecure.pca20035_magpio_configure: MAGPIO successfully configured
Application Started
Starting up into NB-IoT mode
Opening AT Command Socket
From the Info center, I can see that the Antenna Tuning on the PCA20035 is controlled by 3 RF Switches that are connected to the MAGPIOs and each 3 bit combination (from 000-111) is used for different LTE bands with 111 being GPS. From that I would assume that what I actually need is MAGPIO configuration "1,0,1,791,849" for LTE and "1,1,1,1574,1577" for GPS. However, the start-up seems to just pile them all in together as one big command.
Is that the correct way to utilise the MAGPIOs on the PCA20035 or do they actually need to be properly configured for each operation (LTE or GPS).
