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Serial USB REPL (UART)
To use the REPL, a Pycom device must be connected to the host computer with a USB
connection either to an Expansion Board or to serial converter (a diagram of how to do this
can be found the the getting started page for your module).
In order to connect to the REPL over USB serial, there are multiple methods. Detailed below
are the explanations of how to do it in MacOS, Linux and Windows.
All platforms
By far the easiest way to access the USB UART REPL is via the our Pymakr plug-in for
Atom and Visual Studio Code. This adds a pane to the bottom of the editors that allows you
to directly access the REPL and any output from the device. Detailed instructions on how to
setup Pymakr can be found here .
macOS and Linux
To open a serial USB connection from macOS, any serial tool may be used; in this example,
the terminal tool
screen
will be used.
Open a terminal instance and run the following commands:
$ screen /dev/tty.usbmodem* 115200
Upon exiting
screen
, press
CTRL-A CTRL-\
. If the keyboard does not support the
\
-key
(i.e. an obscure combination for
\
like
ALT-SHIFT-7
is required), the key combination can
be remapped for the
quit
command:
create
~/.screenrc
add bind
q
to the
exit
command
This will allow screen to exited by pressing
CTRL-A Q
.
On Linux,
picocom
or
minicom
may be used instead of
screen
. The usb serial
address might also be listed as
/dev/ttyUSB01
or a higher increment for
ttyUSB
.
Additionally, the elevated permissions to access the device (e.g. group uucp/dialout or
use
sudo
) may be required.
1.3.4.1 Serial USB
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