Building an Example

import Contact from '@components/contact.astro';

:::note This guide uses the samr21-xpro board as an example. You can replace it with the name of any other supported board, as learned in the previous section, by replacing samr21-xpro with the name of your board. :::

RIOT provides a number of examples in the examples/ directory. Every example has a README that documents its usage and its purpose. You can build them by opening a shell, navigating to an example (e.g. examples/basic/default), and running:

make BOARD=samr21-xpro

or

make all BOARD=samr21-xpro

To flash the application to a board just run:

make flash BOARD=samr21-xpro

You can then access the board via the serial interface:

make term BOARD=samr21-xpro

If you are using multiple boards you can use the PORT macro to specify the serial interface:

make term BOARD=samr21-xpro PORT=/dev/ttyACM1

For flashing and accessing the board via the serial interface, the current user needs to have the correct access rights on the serial device. The easiest way to ensure this is to add the current user to the group that is owning the serial device. For example, this can be achieved on Linux by issuing the following line, logging out and logging in again:

sudo usermod -aG $(stat --format="%G" /dev/ttyACM0) $USER

:::note The PORT macro has a slightly different semantic in native. Here it is used to provide the name of the TAP interface you want to use for the virtualized networking capabilities of RIOT. :::

We use pyterm as the default terminal application. It is shipped with RIOT in the dist/tools/pyterm/ directory. If you choose to use another terminal program you can set TERMPROG (and if need be the TERMFLAGS) macros:

make -C examples/networking/gnrc/networking/ term \
    BOARD=samr21-xpro \
    TERMPROG=gtkterm \
    TERMFLAGS="-s 115200 -p /dev/ttyACM0 -e"

You may not see the greeting

main(): This is RIOT!

when you flash the board. In this case, type reboot in the command line or reboot manually.