Loss of USB connection after flashing Zephyr image

RE: Loss of USB connection after flashing Zephyr image

Albrecht Markus Schellenberger — Fri, 09 Jul 2021 06:17:33 GMT

Hello Renato,

[quote user="rys"]Sorry, I'm still new with the device tree concept, I thought that you were talking about the file from the boards/ directory.[/quote]

No worries :-) Not that easy understanding the concept right away. You probably already have found it, but this guide did help me a lot when starting with Zephyr, especially this part.

[quote user="rys"]Currently, no. But this point makes sense, I'll try to see whether I can test this, thanks![/quote]

That would be great!

[quote user="rys"]No, I was unaware of this build artifact. I'll check the docs and the zephyr.dts after re-building to see whether my modifications on the overlay were successful or not.[/quote]

Ok, thank you!

Regards,

Markus

RE: Loss of USB connection after flashing Zephyr image

rys — Thu, 08 Jul 2021 12:37:25 GMT

Hi Markus,

[quote userid="100109" url="~/f/nordic-q-a/77127/loss-of-usb-connection-after-flashing-zephyr-image/319083#319083"]I’m very sorry for being unclear, but the snippet I provided actually was from the original zephyr.dts, which is automatically generated from the devicetree in ../build/zephyr during compilation.[/quote]

Sorry, I'm still new with the device tree concept, I thought that you were talking about the file from the boards/ directory.

[quote userid="100109" url="~/f/nordic-q-a/77127/loss-of-usb-connection-after-flashing-zephyr-image/319083#319083"]Do you have an RAK5010 board available? What happens if you flash the "hello world" application to the device? Does this work or do you get the same issue? I’m asking since I’m thinking it would make sense to find out if this is a software or hardware related issue. [/quote]

Currently, no. But this point makes sense, I'll try to see whether I can test this, thanks!

[quote userid="100109" url="~/f/nordic-q-a/77127/loss-of-usb-connection-after-flashing-zephyr-image/319083#319083"]Have you checked ../build/zephyr/zephyr.dts after re-building?[/quote]

No, I was unaware of this build artifact. I'll check the docs and the zephyr.dts after re-building to see whether my modifications on the overlay were successful or not.

Thanks!
Renato

RE: Loss of USB connection after flashing Zephyr image

Albrecht Markus Schellenberger — Thu, 08 Jul 2021 08:01:19 GMT

Hello Renato,

[quote user="rys"]So I created the overlay that your provided, I had to adjust some parts such as removing the address uart@40002000 from the declaration as it was failing the build. I also disabled bg96, which as you said in the first comment, is related to the modem.[/quote]

I’m very sorry for being unclear, but the snippet I provided actually was from the original zephyr.dts, which is automatically generated from the devicetree in ../build/zephyr during compilation.

Do you have an RAK5010 board available? What happens if you flash the "hello world" application to the device? Does this work or do you get the same issue? I’m asking since I’m thinking it would make sense to find out if this is a software or hardware related issue.

[quote user="rys"]So I tried creating an overlay with that change and still nothing.[/quote]

Have you checked ../build/zephyr/zephyr.dts after re-building? This is a good way to confirm that the modifications you have made in the overlay file actually are considered.

Regards,

Markus

RE: Loss of USB connection after flashing Zephyr image

rys — Thu, 08 Jul 2021 01:36:30 GMT

Hi Markus,

I made some tests here based on your suggestion.
So I created the overlay that your provided, I had to adjust some parts such as removing the address uart@40002000 from the declaration as it was failing the build. I also disabled bg96, which as you said in the first comment, is related to the modem.

I was then able to compile and flash the blinky sample successfully, but still coudn't see the device being recognized at /dev. I tried plugging and unplugging the microusb to see if there was any event being sent to dmesg but that didn't happened either. Nor could I see the LED blink.

I double checked the pins from the board, the LED pin and the other ones seem to be matching but I saw a slight difference related to the declaration from TX/RX at uart1.

From the dts file, uart1 declares pins tx/rx as 33/34 but on my custom board they should be set to P1.05/06 (which I believe is 0x25/0x26).

So I tried creating an overlay with that change and still nothing.

Do you have any other ideas on how I could proceed to debug this matter?

Thanks!

RE: Loss of USB connection after flashing Zephyr image

Albrecht Markus Schellenberger — Wed, 07 Jul 2021 06:46:16 GMT

Thanks for your feedback, Renato!

Regards,

Markus

RE: Loss of USB connection after flashing Zephyr image

rys — Wed, 07 Jul 2021 01:16:26 GMT

Hi Markus,

Thanks for the reply. I'm using a pre-built firmware of micropython to this board. The time when I'm capable of seeing the entry as ACM0 is when I use that build.

Regarding your suggestion, I'll give it a try as soon as possible and get back in touch.

Thank you!

Renato

RE: Loss of USB connection after flashing Zephyr image

Albrecht Markus Schellenberger — Tue, 06 Jul 2021 11:43:22 GMT

Hello Renato,

[quote user=""]======================================================
$ ls /dev | grep ttyACM
ttyACM0
ttyACM1
$ ls /dev | grep ttyUSB
$
======================================================[/quote]

What application firmware was loaded to the RAK5010 before you flashed the Hello World example? Do you have access to the code and its configuration?

Since I do not have any experiences with this board, I have to do qualified guessing now ;-) But I hope it will help you somehow:

What I can see in the zephyr.dts when building the hello world application for this board, is that UART1 is used for console logging:

chosen {
		zephyr,entropy = &cryptocell;
		zephyr,flash-controller = &flash_controller;
		zephyr,console = &uart1;
		zephyr,shell-uart = &uart1;
		zephyr,uart-mcumgr = &uart1;
		zephyr,bt-mon-uart = &uart1;
		zephyr,bt-c2h-uart = &uart1;
		zephyr,sram = &sram0;
		zephyr,flash = &flash0;
		zephyr,code-partition = &slot0_partition;
	};

Which UART is the USB connected to on this/your board? Otherwise, UART0 has enabled quectel_bg9x, which I guess is a modem driver? You might wanna disable it using an overlay file and see if that makes any difference?

uart0: uart@40002000 {
			reg = < 0x40002000 0x1000 >;
			interrupts = < 0x2 0x1 >;
			status = "okay";
			label = "UART_0";
			compatible = "nordic,nrf-uart";
			current-speed = < 0x1c200 >;
			tx-pin = < 0x6 >;
			rx-pin = < 0x8 >;
			rts-pin = < 0x7 >;
			cts-pin = < 0xb >;
			quectel_bg9x: quectel_bg9x {
				compatible = "quectel,bg9x";
				label = "quectel,bg9x";
				mdm-power-gpios = < &gpio0 0x2 0x1 >;
				mdm-reset-gpios = < &gpio0 0x1c 0x1 >;
				mdm-dtr-gpios = < &gpio0 0x1a 0x1 >;
				mdm-wdisable-gpios = < &gpio0 0x1d 0x1 >;
				status = "okay";
			};
		};

Regards,

Markus