Firmware source for the Raspberry Pi Debug Probe SWD/UART accessory. Can also be run on a Raspberry Pi Pico.

Raspberry Pi Debug Probe product page

Raspberry Pi Pico product page

The xiao branch of this fork ports the Picoprobe firmware to Seeed Xiao board.
Differences:
because the xiao doesn't break out GP4 and GP5, the UART settings are moved to GP0 and GP1:

#define PICOPROBE_UART_TX 0
#define PICOPROBE_UART_RX 1
#define PICOPROBE_UART_INTERFACE uart0  

the board is set to XIAO

set(PICO_BOARD seeed_xiao_rp2040)

Debug Probe documentation can be found at the Raspberry Pi Microcontroller Documentation portal.

For the purpose of making changes or studying of the code, you may want to compile the code yourself.

First, clone the repository:

git clone https://github.com/raspberrypi/debugprobe
cd debugprobe

Initialize and update the submodules:

 git submodule update --init --recursive

Then create and switch to the build directory:

 mkdir build
 cd build

If your environment doesn't contain PICO_SDK_PATH, then either add it to your environment variables with export PICO_SDK_PATH=/path/to/sdk or add PICO_SDK_PATH=/path/to/sdk to the arguments to CMake below.

Run cmake and build the code:

 cmake ..
 make

Done! You should now have a debugprobe.uf2 that you can upload to your Debug Probe via the UF2 bootloader.

If you want to create the version that runs on the Pico, then you need to invoke cmake in the sequence above with the DEBUG_ON_PICO=ON option:

cmake -DDEBUG_ON_PICO=ON ..

This will build with the configuration for the Pico and call the output program debugprobe_on_pico.uf2, as opposed to debugprobe.uf2 for the accessory hardware.

Note that if you first ran through the whole sequence to compile for the Debug Probe, then you don't need to start back at the top. You can just go back to the cmake step and start from there.

If using an existing debugprobe clone:

• You must completely regenerate your build directory, or use a different one.
• You must also sync and update submodules as rp2350 needs a downstream FreeRTOS port for now.
• PICO_SDK_PATH must point to a version 2.0.0 or greater install.

git submodule sync
git submodule update --init
mkdir build-pico2
cd build-pico2
cmake -DDEBUG_ON_PICO=1 -DPICO_BOARD=pico2 -DPICO_PLATFORM=rp2350 ../

• AutoBaud selection, as PIO is a capable frequency counter
• Possibly include RTT support