echo bot

UART Driver Sample

Overview

This sample demonstrates how to use the UART serial driver with a simple echo bot. It reads data from the console and echoes the characters back after an end of line (return key) is received.

The polling API is used for sending data and the interrupt-driven API for receiving, so that in theory the thread could do something else while waiting for incoming data.

By default, the UART peripheral that is normally used for the Zephyr shell is used, so that almost every board should be supported.

Building and Running

Build and flash the sample as follows, changing nrf52840dk_nrf52840 for your board:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/uart/echo_bot
   :board: nrf52840dk_nrf52840
   :goals: build flash
   :compact:

Sample Output

Hello! I\'m your echo bot.
Tell me something and press enter:
# Type e.g. "Hi there!" and hit enter!
Echo: Hi there!

USB CDC ACM Sample Composite Application

Overview

This sample app demonstrates use of a USB Communication Device Class (CDC) Abstract Control Model (ACM) driver provided by the Zephyr project in Composite configuration.

Two serial ports are created when the device is plugged to the PC. Received data from one serial port is sent to another serial port provided by this driver.

Running

Plug the board into a host device, for example, a PC running Linux. The board will be detected as shown by the Linux dmesg command:

usb 1-1.5.4: new full-speed USB device number 28 using ehci-pci
usb 1-1.5.4: New USB device found, idVendor=2fe3, idProduct=0002, bcdDevice= 2.03
usb 1-1.5.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.5.4: Product: Zephyr CDC ACM Composite sample
usb 1-1.5.4: Manufacturer: ZEPHYR
usb 1-1.5.4: SerialNumber: 86FE679A598AC47A
cdc_acm 1-1.5.4:1.0: ttyACM1: USB ACM device
cdc_acm 1-1.5.4:1.2: ttyACM2: USB ACM device

The app prints on serial output, used for the console:

Wait for DTR

Open a serial port emulator, for example, minicom, and attach it to both detected CDC ACM devices:

minicom --device /dev/ttyACM1
minicom --device /dev/ttyACM2

The app should respond on serial output with:

DTR set, start test
Baudrate detected: 115200
Baudrate detected: 115200

And on ttyACM devices provided by the Zephyr USB device stack:

Send characters to another UART device

The characters entered in one serial port will be sent to another serial port.