Usb read/ write without uart

RE: Usb read/ write without uart

Kazi Afroza Sultana — Fri, 02 Feb 2024 13:13:10 GMT

Hello Kim,

It is not a problem to enable UART driver even though you do not have physical UART mapped to the pins. You can reuse the configuration of cdc_acm_composite sample in your custom sample.

RE: Usb read/ write without uart

kims — Tue, 30 Jan 2024 16:15:54 GMT

Kazi Afroza Sultana Yes I did try it on a nrf5340 DK but as you can see from the screenshot above I am always reading 0 and not the data I write using usb write function.
My intention is to setup usb so that I do not have to use uart calls and implementation is as shown in usb.c file . I am guessing I need to configure endpoints before I can use usb drivers but not sure how to do that. If you can guide me how to set up usb correctly that would help me alot or any sample code that uses zephyr usb api would be much appreciated,

Regards

RE: Usb read/ write without uart

Kazi Afroza Sultana — Mon, 29 Jan 2024 15:37:42 GMT

Hello,

I tried to build the program with your code and device tree set up on nRF5340 DK. It works ok. Did you try to build your custom program on DK?

RE: Usb read/ write without uart

Kazi Afroza Sultana — Mon, 29 Jan 2024 07:48:21 GMT

Hello Kim,

It's not using "uart drivers", it's USB CDC ACM UART, so it's not a problem that you do not have UART on your custom board. It's using USB.

RE: Usb read/ write without uart

kims — Tue, 23 Jan 2024 12:55:08 GMT

Kazi Afroza Sultana any update on this? I would really appreciate how to go about this as I am very much stuck

RE: Usb read/ write without uart

kims — Fri, 19 Jan 2024 10:11:24 GMT

The problem is not in the example code. I can get the cdc acm example to work on nrf5340dk without any issues.
The problem I have is that the example seems to be using uart drivers but I do not have uart on my custom board so I am trying to work with zephyr usb api. And to test it I have removed the uart setup/ code from example code and only trying to use usb api functions to read/ write. I am doing so by replacing the main file in example code with my own usb.c file (attached in original post)

So the question is more how I can use usb api to read/ write over usb and see the result on com port.

RE: Usb read/ write without uart

Kazi Afroza Sultana — Thu, 18 Jan 2024 16:39:29 GMT

Hello,

The usb_cdc_acm exaple should work. Did you select correct COM port? Sometimes you may have a few devices connected at a time. You can check your COM port for this example by doing this.

RE: Usb read/ write without uart

kims — Thu, 18 Jan 2024 14:56:02 GMT

Kazi Afroza Sultana Can you please let me know if there is any other solution/ example I can try? or if you are still working on this problem?

Regards

RE: Usb read/ write without uart

kims — Tue, 16 Jan 2024 09:38:28 GMT

I have tried it and get the same result.
I also tried to use the cdc_acm_composite example on nrf5340dk and replaced my usb.c with the main file and used all the configs as are in the example project but still get the same result.

RE: Usb read/ write without uart

Kazi Afroza Sultana — Mon, 15 Jan 2024 15:31:30 GMT

Hello,

Did you try to follow the config file of cdc_acm sample? I can see you have not added these two:

CONFIG_SERIAL and also CONFIG_UART_INTERRUPT_DRIVEN in the config file.

Maybe you can try this one and see the change?

Thanks.

kazi