This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

Console echo


This example shows how the console_getchar() and console_putchar() functions can be used to echo an input character back to the console.


UART console is required to run this sample.

Building and Running

Build and flash the sample as follows, changing nucleo_f401re for your board. Alternatively you can run this using QEMU, as described in console_getchar().

west build -b nucleo_f401re samples/subsys/console/echo
west flash

Following the initial prompt given by the firmware, start pressing keys on a keyboard, and they will be echoed back to the terminal program you are using.

Sample Output

You should see another line with instructions below. If not,
the (interrupt-driven) console device doesn't work as expected:
Start typing characters to see them echoed back