L01 datasheet(8/31 Pages) PYCOM

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8.0

Programming the device

8.1

UART

By default, the modules run an interactive python

REPL on UART0 which is connected to P0 (RX) and P1

(TX) running at 115200 baud. Code can be run via this

interactive REPL or you can use our PyMakr plugin for

Atom or Visual Studio Code to upload code to the board.

8.2

Wi–Fi

By default, the L01 also acts as a Wi–Fi access point.

SSID: lopy–wlan–XXXX

Password: www.pycom.io

Once connected to the L01’s Wi–Fi network you can

access it in two ways.

8.2.1 Telnet

Running on port 23 is a telnet server. This acts in a

very similar way to the UART. It presents you with an

interactive REPL and can also be used to upload code

via PyMakr.

8.2.2

FTP

The L01 also runs a FTP server that allows you to copy

files to and from the device, include an SD card if one

is connected. To connect to this FTP server, you need

to use plain FTP (un–encrypted) with the following

credentials:

User: micro

Password: python

9.0

Boot modes

9.1

Bootloader mode

In order to update the firmware of the L01 device, it

needs to be placed into bootloader mode. In order to

do this, P2 needs to be connected to ground when the

device reboots. Once in bootloader mode you can use

the Pycom firmware update tool to update to the latest

official firmware. If you are developing your own firmware

based on our open–source firmware, a flashing script is

provided with the source code.

9.2

Safe boot

The micropython firmware features a safe boot feature

that skips the boot.py and main.py scripts and goes

straight to the REPL. This is useful if the device is

programmed with code that causes the device to crash or

become inaccessible. To access this mode, you need to

connect P12 to 3.3V and reset the device. Upon entering

safe boot mode, the on–board LED will begin to blink

orange. Depending on the duration the pin is held at 3.3V,

a different firmware will be run.

Table 3 – Boot modes

0–3 Seconds

3–6 Seconds

Current firmware without running

boot.py or main.py

Previous firmware if the firmware was uploaded via OTA

(without running boot.py and main.py)

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