Setting up a build environment for building MicroPython for Raspberry Pi Pico (W) and Arduino Nano RP2040 Connect.

micropython-pico-setup.txt

Source: https://forum.micropython.org/viewtopic.php?f=21&t=9965

1) Clone the repo:
  a) git clone https://www.github.com/micropython/micropython
  b) Specific version:
    i.) git clone -b v1.19.1 https://github.com/micropython/micropython.git
    Note: v1.19.1 does not work! Use latest instead.
  Note: --recursive is not needed

2) Build mpy-cross:
  cd micropython/
  make -j4 -C mpy-cross/

3) Get submodules:
  git submodule update --init -- lib/pico-sdk
  git submodule update --init -- lib/tinyusb
  git submodule update --init -- lib/mynewt-nimble #For RP2040 Connect

4) Set up the Pico SDK:
  cd lib/pico-sdk
  git submodule update --init
  cd ../..
  cd ports/rp2

5) Build submodules:
  a) make -j4 BOARD=PICO submodules
  b) make -j4 BOARD=ARDUINO_NANO_RP2040_CONNECT submodules

6) Build:
  a) make -j4 BOARD=PICO
  b) make -j4 BOARD=ARDUINO_NANO_RP2040_CONNECT


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Quick-one-liners:
The long commands below will run everything in this guide automatically.
A clean build will also be made. If all commands execute successfully, you'll see a green "Setup done" message.

1) Generic Pico board:
git clone https://www.github.com/micropython/micropython && cd micropython/ && make -j4 -C mpy-cross/ && git submodule update --init -- lib/pico-sdk && git submodule update --init -- lib/tinyusb && git submodule update --init -- lib/mynewt-nimble && cd lib/pico-sdk && git submodule update --init && cd ../.. && cd ports/rp2 && make -j4 BOARD=PICO submodules && make -j4 BOARD=PICO && echo -e "\n\n\e[1m\e[1;37m-> \e[1;32m\e[1mSetup done\! Thank you.\e[0m"

1) RP2040 Connect:
git clone https://www.github.com/micropython/micropython && cd micropython/ && make -j4 -C mpy-cross/ && git submodule update --init -- lib/pico-sdk && git submodule update --init -- lib/tinyusb && git submodule update --init -- lib/mynewt-nimble && cd lib/pico-sdk && git submodule update --init && cd ../.. && cd ports/rp2 && make -j4 BOARD=ARDUINO_NANO_RP2040_CONNECT submodules && make -j4 BOARD=ARDUINO_NANO_RP2040_CONNECT && echo -e "\n\n\e[1m\e[1;37m-> \e[1;32m\e[1mSetup done\! Thank you.\e[0m"