RPi Pico Probe

This firmware implements an CMSIS-DAP v1 and v2 compatible probe on the RPi Pico.

It's currently using a bit-banged driver, so expect max speeds around 2 MHz.

Current pinout

You can change this to whatever you want in setup.rs.

Pin	Description
GPIO13	nRESET
GPIO14	SWDIO
GPIO15	SWCLK

Building

You can build the project and generate a .uf2 file as follows:

# Install elf2uf2-rs
cargo install elf2uf2-rs

# Build the ELF without logging
DEFMT_LOG=off cargo build --release --bin pico-probe 

# Generate .uf2 file
elf2uf2-rs target/thumbv6m-none-eabi/release/pico-probe pico-probe

Start the Pico in bootloader mode and drop the pico-probe.uf2 file to it, done!

TODO

• Move SWD impl to PIO
• Add support for SWO (Manchester encoding or UART via PIO)
• Add support for VCP (it enumerates now, but ignores all data)
• Add the automatic polling of RTT buffers
• Document the dap-rs traits and helpers
• Document the firmware