nrf52840 Dongle - Uart communication fails

RE: nrf52840 Dongle - Uart communication fails

warcomeb-am — Wed, 22 May 2024 07:20:29 GMT

Hello Edvin,

Yesterday I received the nrf52-dk board and I flash into the same code... and it works as I want without any change! 🤔

I don't understand why, but it doesn't matter... I'll continue with the dk!

Best

Marco

RE: nrf52840 Dongle - Uart communication fails

Edvin — Tue, 21 May 2024 22:17:55 GMT

Hello Marco,

[quote user="warcomeb-am"]but I realy don't understand why a simple thing like sending some chars on uart doesn't work![/quote]

Setting up a peripheral and getting it to work without a debugger can be a struggle. There are lot's of things that can happen, and without a debugger it is difficult to say what the issue is. I could ask for a copy of your application and run it on a DK, but you will probably run into many similar issues along the way, so it will be a lot quicker when you have the possibility to see the debug output yourself, instead of waiting for me to replicate all the issues that you encounter along the way.

For example all the fault handlers will use UART0, and these will not be posted properly without a debugger. This means that as long as your application is working as intended, you will be able to see "logs" that you print from your application, but once something crashes, the application will not be able to handle printing that without a debugger.

Best regards,

Edvin

RE: nrf52840 Dongle - Uart communication fails

warcomeb-am — Tue, 21 May 2024 11:38:59 GMT

Hello Edvin

thanks for your reply. If I remove CONFIG_SERIAL the CONFIG_UART_ASYNC_API told me that serial support is missing. Now, on my application there is only a led that blink... it is very simple and when I enable the uart the LED stops blinking.

I also try to use uart0, but the result is the same.

Yesterday I bought a DK board for the next tests, but I realy don't understand why a simple thing like sending some chars on uart doesn't work!

Best,

Marco

RE: nrf52840 Dongle - Uart communication fails

Edvin — Tue, 21 May 2024 09:12:00 GMT

Hello Marco,

I am not sure what the issue is, but it could be that you are trying to use the CONFIG_SERIAL, which uses the UART0 backend, which is probably not connected to anything in your case. So you could try to either set CONFIG_SERIAL=n, (this is the UART terminal used by zephyr to print logs etc), or you can try to use UART0 instead of UART1 in your application.

Either way, you will probably run into other issues while developing, and doing so without a debugger can be extremely time consuming. I suggest that you get hold of a proper development kit sooner rather than later. When you are done with your application, you can port it over to the dongle.

Best regards,

Edvin