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Setting up the Build Environment

Install Submodules

This project uses the Harp Core RP2040 library as a submodule. Install it with:

git submodule update --init

Install Pico SDK

This project uses the Pico SDK. The SDK needs to be downloaded and installed to a known folder on your PC. Note that the PICO SDK also contains submodules (including TinyUSB), so you must ensure that they are also fetched with:

git clone git clone [email protected]:raspberrypi/pico-sdk.git
git submodule update --init --recursive

Point to Pico SDK

Recommended, but optional: define the PICO_SDK_PATH environment variable to point to the location where the pico-sdk was downloaded. i.e:

PICO_SDK_PATH=/home/username/projects/pico-sdk

On Linux, it may be preferrable to put this in your .bashrc file.

Compiling the Firmware

Without an IDE

From this directory, create a directory called build, enter it, and invoke cmake with:

mkdir build
cd build
cmake ..

If you did not define the PICO_SDK_PATH as an environment variable, you must pass it in here like so:

mkdir build
cd build
cmake -DPICO_SDK_PATH=/path/to/pico-sdk ..

After this point, you can invoke the auto-generated Makefile with make

Flashing the Firmware

Press-and-hold the Pico's BOOTSEL button and power it up (i.e: plug it into usb). At this point you do one of the following:

  • drag-and-drop the created *.uf2 file into the mass storage device that appears on your pc.
  • flash with picotool