When plugged into <Ubuntu 22.04> via the <USB Micro-B> the <Micro Bit> mounts as:
``
/media/$USER/MICROBIT/
``
e.g.:
``
/media/ciro/MICROBIT/
``
for username `ciro`.

Loading the program is done by simply copying a `.hex` binary into the image e.g. with:
``
cp ~/Downloads/microbit_program.hex /media/$USER/MICROBIT/
``
The file name does not matter, only the `.hex` extension.

The back power light flashes while upload is happening.

Flashing takes about 10-15 seconds for the 1.8 MB scroll display hello world from https://microbit-micropython.readthedocs.io/en/v1.0.1/tutorials/hello.html[]:
``
from microbit import *
display.scroll("Hello, World!")
``
and the program starts executing immediately after flash ends.

You can restart the program by clicking the reset button near the USB. When you push down the program dies, and it restarts as soon as you release the button.


Micro Bit getting started

{tag=MicroPython}

* https://www.raspberrypi.com/documentation/microcontrollers/c_sdk.html
* https://github.com/raspberrypi/pico-sdk
* https://github.com/raspberrypi/pico-examples The key hello world examples are:
  * https://github.com/raspberrypi/pico-examples/tree/a7ad17156bf60842ee55c8f86cd39e9cd7427c1d/hello_world/usb
  * https://github.com/raspberrypi/pico-examples/tree/a7ad17156bf60842ee55c8f86cd39e9cd7427c1d/blink

<Ubuntu 22.04> build just worked, nice! Much feels much cleaner than the <Micro Bit> C setup:
``
sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib

git clone https://github.com/raspberrypi/pico-sdk
cd pico-sdk
git checkout 2e6142b15b8a75c1227dd3edbe839193b2bf9041
cd ..

git clone https://github.com/raspberrypi/pico-examples
cd pico-examples
git checkout a7ad17156bf60842ee55c8f86cd39e9cd7427c1d
cd ..

export PICO_SDK_PATH="$(pwd)/pico-sdk"
cd pico-exampes
mkdir build
cd build
# Board selection.
# https://www.raspberrypi.com/documentation/microcontrollers/c_sdk.html also says you can give wifi ID and password here for W.
cmake -DPICO_BOARD=pico_w ..
make -j
``

Then we install the programs just like any other <UF2> but plugging it in with BOOTSEL pressed and copying the UF2 over, e.g.:
``
cp pico_w/blink/picow_blink.uf2 /media/$USER/RPI-RP2/
``
Note that there is a separate example for the W and non W LED, for non-W it is:
``
cp blink/blink.uf2 /media/$USER/RPI-RP2/
``

Also tested the UART over USB example:
``
cp hello_world/usb/hello_usb.uf2 /media/$USER/RPI-RP2/
``
You can then see the UART messages with:
``
screen /dev/ttyACM0 115200
``

TODO understand the proper debug setup, and a flash setup that doesn't require us to plug out and replug the thing every two seconds. https://www.electronicshub.org/programming-raspberry-pi-pico-with-swd/ appears to describe it, with SWD to do both debug and flash. To do it, you seem need another board with <GPIO>, e.g. a <Raspberry Pi>, the laptop alone is not enough.


Program Raspberry Pi Pico W with C

{c}

https://github.com/microsoft/uf2

A <Microsoft> format for flashing <microcontrollers> by copying files to a magic filesystem mounted  on host, e.g. as done on the <Micro Bit> and <Raspberry Pi Pico>.


Blinks the on-board LED if the board has one.

Does not work on:
* <Micro Bit>: build fails
* <Raspberry Pi Pico W>: build works but does nothing because the LED is connected differently


Zephyr blinky example

{c}
{title2=2016}
{title2=BBC Micro Bit}
{wiki}

<Bluetooth> support: not enough <RAM> for it, though in principle its chip/<transceiver> could support it! https://microbit-micropython.readthedocs.io/en/v1.0.1/ble.html

Supported editors: https://microbit.org/code/

MicroPython web editor and compiler: https://python.microbit.org/v/2

Everything in this section is tested on the <Micro Bit v1> from <ciro-santilli-s-hardware/Micro Bit v1> unless otherwise noted.

Bibliography:
* https://github.com/carlosperate/awesome-microbit

\Image[https://upload.wikimedia.org/wikipedia/en/thumb/a/a3/Micro-bit_v1_%26_v2.JPG/1024px-Micro-bit_v1_%26_v2.JPG]


Ciro Santilli @cirosantilli 37

 Incoming links: Micro Bit