merge cdc-acm support and BLE service

[Sergio Bezz]

I has successfully built the following demos and run them on a nrf52840 dongle (board: nrf52840dongle_nrf52840) :

• cdc-acm-console demo            from Samples and Demos » Various Subsystems Samples » USB device support samples
• bluetooth-st_ble_sensor demo from Samples and Demos » Bluetooth Samples

Based on these demos I am trying to introduce cdc-acm-console support to the bluetooth-st_ble_sensor demo.

Could you please help me to produce the right project configuration (and eventual overlay) to merge both functions (cdc-acm-console and ble GATT services) on a single demo ?

thanks in advance

[Sigurd]

Hi,

Start with the bluetooth sample, and then add the overlay and prj.conf that is used in the USB console sample.

https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/subsys/usb/console

https://github.com/zephyrproject-rtos/zephyr/blob/main/samples/subsys/usb/console/app.overlay

https://github.com/zephyrproject-rtos/zephyr/blob/main/samples/subsys/usb/console/prj.conf

[Sergio Bezz]

Thanks, that's what I did :I added the contains of USB console’s prj.conf in the bluetooth sample’s prj.conf.

and I assume that the overlay is properly taken into account, as I see :

Building st_ble_sensor

west build --build-dir c:\ Perso\Nordic\st_ble_sensor\build c:\Perso\Nordic\st_ble_sensor --pristine --board nrf52840dongle_nrf52840 -- -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=On -DNCS_TOOLCHAIN_VERSION:STRING="NONE" -DBOARD_ROOT:STRING="c:/Perso/Nordic/peripheral_lbs1" -DCONF_FILE:STRING="c: /Perso/Nordic/st_ble_sensor/prj.conf" -DDTC_OVERLAY_FILE:STRING="c:/ Perso/Nordic/st_ble_sensor/app.overlay"

 

Then, in the main.c I instantiate the console :

BUILD_ASSERT(DT_NODE_HAS_COMPAT(DT_CHOSEN(zephyr_console), zephyr_cdc_acm_uart),  "Console device is not ACM CDC UART device");

 

but the build stops at this point :

c:\Perso\Nordic\st_ble_sensor\src\main.c:30:1: error: static assertion failed: "Console device is not ACM CDC UART device"
30 | BUILD_ASSERT(DT_NODE_HAS_COMPAT(DT_CHOSEN(zephyr_console), zephyr_cdc_acm_uart),
| ^~~~~~~~~~~

hence the console is not properly set-up

[Sigurd]

Hi,

I tried reproducing this, but I did not get this build assert.

What version of nRF Connect SDK(NCS) are you using ?

If you are using an older version, app.overlay might need to look like this

/*
 * Copyright (c) 2021 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */

 / {
	chosen {
		zephyr,console = &cdc_acm_uart0;
	};
};

&usbd {
	cdc_acm_uart0: cdc_acm_uart0 {
		compatible = "zephyr,cdc-acm-uart";
		label = "CDC_ACM_0";
	};
};

(i.e. &usbd instead of &zephyr_udc0)