No output on UART Xiao NRF52840 sense + GPS Quectel L76K

[Tomasz Derek]

Hi everyone!

I wrote code in arduino IDE but wanted to use all potential of Xiao NRF52840 with use of Nordic SDK and Zephyr RTOS as well as zigbee on my small side project but I'm struggling with getting readings from UART. I'm successfully reading data from builtin IMU but cannot get anything from GPS (arduino code show results). I've attached my main.c file as well as prj.conf and .overlay file. And my second question is: is there any way to synchronize GPS and IMU readings?


/cfs-file/__key/communityserver-discussions-components-files/4/seeed_5F00_xiao_5F00_nrf5284.overlay/cfs-file/__key/communityserver-discussions-components-files/4/5367.prj.conf/cfs-file/__key/communityserver-discussions-components-files/4/672888.main.c

[Elfving]

Hi,

Not sure if I am understanding you correctly here, though we mainly support the official west/NCS toolchain here. I see that the Xiao NRF52840 is supposed to also support arduino, though this is something that we wont't be able to support well here on devzone. Although if you are using prj.conf files and dts files, I guess you are not really using the arduino toolchain?

The response below looks to be from some bot which I was just about to delete, but it might be something to suggestion of making sure the baudrates are right.

sarahjones said:

The L76K default is typically 9600 baud. If your nRF52840 UART

Regards,

Elfving

[Tomasz Derek]

Just to clarify I made first version as simple POC in arduino IDE but right I struggle with rewroting it to Zephyr with Nordic SDK. Changing baud rate didn't help

[Elfving]

I see. Are you able to get simple samples to work on this Xiao NRF52840? 

[Tomasz Derek]

Yes 

[Elfving]

Then we know atleast that you have the right boardfiles. Does basic UART samples work as well? I assume the issue is related to something related to configuration. The devacademy course on UART might be a good resource for this.

[Tomasz Derek]

I've run this example: https://docs.zephyrproject.org/latest/samples/drivers/uart/echo_bot/README.html but my board is not detected as com port on windows and only on linux it works :/ but one thing bother me a lot why on device tree to &uart0 Node says: `nothing is connected` it means software is not connected? I wonder cause I've two board connected like this one: