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RP2040 (Raspberry Pi Pico) reference firmware

Fourth reference implementation of testbench's device contract (MSP430: firmware/main.c, ESP32: firmware/esp32/, STM32: firmware/stm32/). Two reasons this one's here specifically:

  1. RP2040 is genuinely industry-adopted for cost-sensitive production hardware, not just a hobbyist board.
  2. It closes the loop on testbench's own story: the recommended bridge host is a Raspberry Pi, so this reference firmware puts the same silicon vendor on both sides of the UART link.

Written against the official Raspberry Pi Pico C SDK directly, no Arduino wrapper. Same toolchain used for production RP2040 firmware. Nothing on the bridge, backend, or dashboard changed to support this chip; it emits byte-for-byte the same JSON frames as every other reference firmware in this repo.

Wiring

Signal GPIO Purpose
UART TX GPIO0 to bridge host RX
UART RX GPIO1 to bridge host TX
ADC: VDD sense GPIO26 (ADC0) external divider to VDD
ADC: current sense GPIO27 (ADC1) current-sense shunt/amplifier output
ADC: temp sense GPIO28 (ADC2) NTC thermistor divider
GPIO loopback out GPIO15 jumper to GPIO14
GPIO loopback in GPIO14 jumper to GPIO15

Build

export PICO_SDK_PATH=/path/to/pico-sdk
cd firmware/rp2040
mkdir build && cd build
cmake .. -DPICO_BOARD=pico
make -j4

Flash by holding BOOTSEL while plugging in the Pico, then copying build/testbench_rp2040.uf2 to the USB mass-storage drive that appears.