Doggie RP2040

Description

This implementation provides the hardware abstraction for Doggie and evilDoggie to run in the Raspberry Pi Pico RP2040 microcontroller family.

Supported Configurations

Doggie

The RP2040 implementation supports the following configurations.

  1. USB and MCP2515 (SPI to CAN)
  2. UART and MCP2515 (SPI to CAN)

For a detailed documentation refer to the Doggie on RP2040 documentation

evilDoggie

The ESP32 implementation supports only one configuration.

For a detailed documentation refer to the evilDoggie on RP2040 documentation

How to Flash a Release

  • USB and MCP2515:

    1. Download the release doggie_pico_usb_mcp.uf2.
    2. Connect the Pico in bootloader mode and copy the release.

  • UART and MCP2515:

    1. Download the release doggie_pico_uart_mcp.uf2.
    2. Connect the Pico in bootloader mode and copy the release.

How to Compile and Flash

Prerequisites

  1. Install Rust and cargo with support for ARM architecture. Follow the installation instructions from the official Rust website.

  2. Add the target architecture:

    rustup target add thumbv6m-none-eabi

  3. To program a Pico, you can put it in bootloader mode and copy the firmware or use another Pico as a probe.

    • If you want to program your Pico by copying the firmware, install elf2uf2-rs:

      cargo install elf2uf2-rs

    • If you want to program your Pico using another Pico as a probe, install probe-rs:

      curl --proto '=https' --tlsv1.2 -LsSf https://github.com/probe-rs/probe-rs/releases/latest/download/probe-rs-tools-installer.sh | sh

Additionally, you have to modify doggie_pico/.cargo/config.toml:

[target.'cfg(all(target_arch = "arm", target_os = "none"))']
# runner = "elf2uf2-rs -d"               # Program by copying firmware
runner = "probe-rs run --chip RP2040"  # Program with another Pico

[build]
target = "thumbv6m-none-eabi"          # Cortex-M0 and Cortex-M0+

[env]
DEFMT_LOG = "trace"

And setup a Pico as a probe by cloning the RPI debug probe repo, building it for the pico:

git clone https://github.com/raspberrypi/debugprobe.git
cd debugprobe
mkdir build
cd build
cmake -DDEBUG_ON_PICO=ON ..
make

Copying the resulting .uf2 image to the probe Pico, and connecting it to the target Pico.

Connections:

Function Pico Probe Target Probe
Vcc VBUS VBUS
GND GND GND
SWCLK GP2 SWCLK
SWDIO GP3 SWDIO
UART -> GP4 GP1
UART <- GP5 GP0

alt text

Compile and Flash the Firmware:

  1. Connect the target Pico to the PC in bootloader mode or to the probe as shown before.

  2. Then we need to select the desired project with the --bin flag:

    • doggie
    • evil_doggie

  3. And then we flash with:

DEFMT_LOG=off cargo run --release --bin {BIN} --disable-default-features --features {FEATURES}