nRF9160 toggle gpio with modem active/inactive state

RE: nRF9160 toggle gpio with modem active/inactive state

Simon — Sat, 02 Nov 2019 22:18:02 GMT

I think this can be archived if you physically connect the COEX2 pin to a specific GPIO (e.g. P0.31). Then you can use the GPIOTE module to generate an event when this pin changes value and toggle another GPIO (e.g. P0.30) though DPPI.

COEX2 changes value → GPIOTE event from P0.31 → DPPI → GPIOTE task on P0.31 (toggles)

Best regards,

Simon

RE: nRF9160 toggle gpio with modem active/inactive state

khodidas — Thu, 31 Oct 2019 08:50:15 GMT

Hi,

Thanks Simon.

Is it possible to toggle GPIO based on the state of this COEX2 pin using DPPI ?

If yes , can you give me any example of it ?

Regards,

Smitesh Mali

RE: nRF9160 toggle gpio with modem active/inactive state

Simon — Tue, 22 Oct 2019 22:24:25 GMT

I took a closer look at this, and you don't need to send any AT commands in order to use the COEX interface. One thing you should make sure, if you are using the nRF9160 DK, is that the interface pins 6-8 are routed to the COEX interface. However, if you haven't changed anything, this should be done by default (Check out the file boards/arm/nrf52840_pca10090/Kconfig).

To see whether the modem is active or not, attach a 100kΩ pull-down resistor to the COEX2 pin on the P1 connector (see image below), and check its digital value.

I tested it out with the udp_with_psm sample, and configured active time to 1 minute and periodic tau to 90 seconds. I checked the results of COEX2 with a digital analyzer, and it worked as expected:

Best regards,

Simon

RE: nRF9160 toggle gpio with modem active/inactive state

khodidas — Mon, 21 Oct 2019 03:33:51 GMT

Hi Simon,

Please take a look at it.

I read the description of COEX0, COEX1 and COEX2 from below link

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf9160%2Fdita%2Fchapters%2Fradio_lte%2Fgnss_coext_if.html

COEX2: Output from the LTE modem to the external device. When active high, indicates that the LTE modem transceiver is turned on.

It seems COEX2 pin is more suitable than COEX1 for controlling LDO sleep control pin.

But I don't know how to make use of that pin.

I mean , do i need to send any AT command to modem to instruct Modem to toggle this pin when transceiver is

turned on or off.

Regards,

Smitesh Mali

RE: nRF9160 toggle gpio with modem active/inactive state

Simon — Sun, 20 Oct 2019 22:36:09 GMT

Have you tried using COEX1, I think it does what you are asking about. I can take a closer look at it if you would like to.

Best regards,

Simon

RE: nRF9160 toggle gpio with modem active/inactive state

Simon — Thu, 17 Oct 2019 11:34:27 GMT

I am sorry for the delay, I am currently looking into your issue and will try to provide an answer as soon as possible.

Best regards,

Simon