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3-1-b-setup-pico-sdk.org

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Setup Pico SDK

The first thing first, you need to clone the PicoSDK repo to a folder, can be any folder, you don’t need to put it into the current project folder.

For example, I use ~/pico folder:

mkdir ~/pico && cd ~/pico
git clone --depth=1 https://github.com/raspberrypi/pico-sdk.git

Clone all submodules for the Pico Wireless board:

cd pico-sdk
git submodule update --init --depth=1

# Submodule 'lib/btstack' (https://github.com/bluekitchen/btstack.git) registered for path 'lib/btstack'
# Submodule 'lib/cyw43-driver' (https://github.com/georgerobotics/cyw43-driver.git) registered for path 'lib/cyw43-driver'
# Submodule 'lib/lwip' (https://github.com/lwip-tcpip/lwip.git) registered for path 'lib/lwip'
# Submodule 'lib/mbedtls' (https://github.com/Mbed-TLS/mbedtls.git) registered for path 'lib/mbedtls'
# Submodule 'tinyusb' (https://github.com/hathach/tinyusb.git) registered for path 'lib/tinyusb'
# Cloning into '/Users/wison/pico/pico-sdk/lib/btstack'...
# Cloning into '/Users/wison/pico/pico-sdk/lib/cyw43-driver'...
# Cloning into '/Users/wison/pico/pico-sdk/lib/lwip'...
# Cloning into '/Users/wison/pico/pico-sdk/lib/mbedtls'...
# Cloning into '/Users/wison/pico/pico-sdk/lib/tinyusb'...
# Submodule path 'lib/btstack': checked out '0d212321a995ed2f9a80988f73ede854c7ad23b8'
# Submodule path 'lib/cyw43-driver': checked out '9bfca61173a94432839cd39210f1d1afdf602c42'
# Submodule path 'lib/lwip': checked out '239918ccc173cb2c2a62f41a40fd893f57faf1d6'
# Submodule path 'lib/mbedtls': checked out 'a77287f8fa6b76f74984121fdafc8563147435c8'
# Submodule path 'lib/tinyusb': checked out '86c416d4c0fb38432460b3e11b08b9de76941bf5'

If you forgot this step and you’re using the Pico Wireless board, then you will see the following error when trying to run your project cmake command:

# CMake Warning at /Users/wison/pico/pico-sdk/src/rp2_common/tinyusb/CMakeLists.txt:10 (message):
#   TinyUSB submodule has not been initialized; USB support will be unavailable
#
#   hint: try 'git submodule update --init' from your SDK directory
#   (/Users/wison/pico/pico-sdk).
#
#
# CMake Warning at /Users/wison/pico/pico-sdk/src/rp2_common/pico_btstack/CMakeLists.txt:10 (message):
#   btstack submodule has not been initialized; Pico W BLE support will be
#   unavailable.
#
#               hint: try 'git submodule update --init' from your SDK directory (/Users/wison/pico/pico-sdk).
#
#
# CMake Warning at /Users/wison/pico/pico-sdk/src/rp2_common/pico_cyw43_driver/CMakeLists.txt:11 (message):
#   cyw43-driver submodule has not been initialized; Pico W wireless support
#   will be unavailable
#
#   hint: try 'git submodule update --init' from your SDK directory
#   (/Users/wison/pico/pico-sdk).
#
#
# CMake Warning at /Users/wison/pico/pico-sdk/src/rp2_common/pico_lwip/CMakeLists.txt:10 (message):
#   LWIP submodule has not been initialized; Pico W wireless support will be
#   unavailable
#
#   #hint: try 'git submodule update --init' from your SDK directory
#   (/Users/wison/pico/pico-sdk).