2.4. Flashing

Flashing means to overwrite the application code or firmware with a new version. In other words it is re-programming the microcontroller with new code. The bootloader itself can be flashed with a new bootloader but this is much less commonly done.

The graphic below gives an overview of the process.

2.4.1. Steps

Warning

Flashing requires a WebUSB compatible browser such as recent versions of Chrome, Edge or Opera.

1. Plug in the micro:bit to your computer via USB

2. Write your code in the MicroPython editor

3. Click “Send to micro:bit”

4. Select the correct USB device and click “Connect”

5. If flashing was successful you should see the message below

2.4.2. Exercises

1. Navigate to the MicroPython editor https://python.microbit.org/v/3. If you already have it open, then use that existing window or tab.

2. Connect your micro:bit using the instructions on the previous page

3. Enter the following code into the editor

from microbit import *

while True:
    display.scroll("I'll be back.")

4. Flash the code to your micro:bit.

If you get stuck ask a peer or your teacher for help!

Question 1

Now edit the scrolling message to whatever you like. Re-flash the code to your micro:bit.

Describe what happens.

Solution

You should see the progress bar and successful flash message. The scrolling message should be updated on the LED matrix.

Question 2

Press and release the Reset button on the back of the micro:bit while it is running.

Describe what happens.

Solution

Solution is locked

Question 3

Disconnect the USB cable from the micro:bit while it is running then reconnect it.

Describe what happens.

Solution

Solution is locked

Question 4

After re-connecting the micro:bit, change the code again and try to flash the micro:bit.

Describe what happens.

Solution

Solution is locked