Long-standing latent bug: SPI parts (ILI9341, custom chips, etc.)
register a handler on simulator.spi.onByte via the lazy adapter, but
the actual rp2040.spi[0].onTransmit assignment in initMCU was a pure
loopback that never consulted the adapter. The MicroPython init path
(initMicroPython) had the adapter-aware version since day one;
the Arduino path (initMCU) didn't.
Symptom: Pico Doom + every other Arduino sketch driving an ILI9341
on the RP2040 saw an empty SPI bus. The ILI9341 emulator's onByte
handler was wired up correctly — it just never received a single
byte. Pantalla negra.
Fix: copy the adapter-aware handler from initMicroPython (line 219)
into initMCU (line 441). Each byte the firmware writes to SPI0 now
checks `_spiAdapter.onByte` first; if a part is registered, it gets
the byte; otherwise we keep the original loopback as the fallback
so plain "echo MOSI back as MISO" sketches still work.
Combined with the earlier MADCTL fix (commit 6edc715) and the
power+MISO wiring fix (8440836), Pico Doom should now render its
title screen + the raycaster.
Build verified (vite OSS+pro, 285 SEO pages).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Implement HD44780Decoder for decoding I2C commands to HD44780-compatible LCDs.
- Add bmp280_bridge_reader.ino to read BMP280 chip_id and status registers via I2C.
- Create i2c_scanner_multi.ino to scan I2C addresses and report responding devices.
- Introduce lcd_i2c_hello.ino to demonstrate basic LCD functionality with I2C.
- Implement pcf8574_bidirectional.ino to test bidirectional communication with PCF8574.
- Add pico_i2c_master_reader.ino for reading BMP280 from a Raspberry Pi Pico.
- Create rtc_lcd_clock.ino to display time from a DS1307 RTC on an I2C LCD.
Previous fix added an ESP32-specific code path inside ili9341Simulation
to subscribe to the QEMU worker's spi_event stream. That made the LCD
work on ESP32-CAM but left the underlying issue unsolved: every other
SPI part (custom chips, future SD-card emulators, the SSD168x ePaper
already in the codebase) would also need its own per-board branching.
The right shape: every simulator exposes a `.spi` member matching the
SAME SpiBusLike interface, and SPI parts hook .spi.onByte without
caring which board they're attached to. AVRSimulator already had
this — now everything else does too.
frontend/src/simulation/SpiBus.ts (new)
Defines the contract — `onByte: (mosi) => void | null` plus
optional `completeTransfer(miso)`. Documents the single-listener
semantics that AVR has had since day one.
frontend/src/store/useSimulatorStore.ts
Esp32BridgeShim gets a lazy `.spi` getter that wraps
bridge.onSpiByte (the per-byte WS event from the QEMU worker).
completeTransfer is a no-op because the worker drives MISO via
its own _spi_response global. Covers ESP32 (Xtensa), ESP32-S3,
ESP32-CAM, ESP32-C3 — every kind that routes through Esp32Bridge.
frontend/src/simulation/RP2040Simulator.ts
Adds a lazy `.spi` getter that re-routes rp2040.spi[0].onTransmit
through the adapter. Default loopback (the prior behaviour) is
preserved when no part has accessed `.spi` yet — only consumers
that opt in see their handler invoked. Covers Pico and Pico W.
frontend/src/simulation/parts/ComplexParts.ts
ili9341Simulation no longer has an ESP32 special case. Single
code path: `simulator.spi.onByte = handler`. Works on AVR,
RP2040, all ESP32 variants. Same pattern is now available to
every future SPI part — ssd1306, sd-card, oled, etc.
The Esp32Bridge.ts spi_event field-name fix from 6afa62e (msg.data.event
instead of the non-existent msg.data.data) stays in place — that's what
makes the per-byte stream actually arrive in the bridge.
Verified: ILI9341 + ESP32-CAM gallery example renders the live webcam
preview after a hard refresh. The same simulation code works on Arduino
Uno + ILI9341 (the existing ili9341-test-sketch in example_zip).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Introduced SVG layout dimensions for Phase 1 (B/W mono) and Phase 2 (colour) ePaper panels, detailing active areas, bezels, and pin layouts.
- Developed a phased emulation plan outlining the architecture and deliverables for different panel types, including SSD168x and UC81xx.
- Created a canonical "Hello, World!" sketch for the 1.54" ePaper panel, ensuring compatibility across ESP32, Raspberry Pi Pico, and Arduino Uno.
- Implemented a pure Python SSD168x decoder to validate SPI command sets and framebuffers against specifications.
- Added tests for compiling the hello-world sketch across supported boards and for the SSD168x protocol to ensure correct framebuffer behavior.
- Modified the index file to reflect the new naming convention for Velxio components.
- Changed JSX declarations to use 'velxio-' prefix for various components.
- Updated component overrides to replace 'wokwi-' with 'velxio-' for logic gates and other components.
- Adjusted SVG generation script to use 'velxio-' prefix for BMP280 and Raspberry Pi components.
- Marked submodules as dirty in QEMU and RP2040 libraries.
- Added .prettierignore and .prettierrc.json for consistent code formatting.
- Introduced InstrumentComponent with support for Voltmeter and Ammeter, including pin information handling.
Implements MicroPython emulation for Raspberry Pi Pico boards running
entirely in the browser using rp2040js. Users can toggle between
Arduino C++ and MicroPython modes via a language selector dropdown.
Key changes:
- Add LanguageMode type and BOARD_SUPPORTS_MICROPYTHON to board types
- Create MicroPythonLoader.ts: UF2 firmware parser, LittleFS filesystem
builder (via littlefs-wasm), IndexedDB firmware caching
- Extend RP2040Simulator with loadMicroPython() method using USBCDC for
serial REPL instead of UART
- Add setBoardLanguageMode and loadMicroPythonProgram store actions
- Update EditorToolbar with language toggle and MicroPython compile flow
- Enhance SerialMonitor with REPL label, Ctrl+C/D support
- Bundle MicroPython v1.20.0 UF2 firmware as fallback in public/firmware/
- Update useEditorStore to create main.py default for MicroPython mode
Closes#3
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Added board-agnostic sensor registration methods in RP2040Simulator.
- Enhanced ComplexParts to handle LEDC PWM duty updates for ESP32.
- Updated ProtocolParts to check if the simulator handles sensor protocols natively, delegating to backend if applicable.
- Introduced pre-registration of sensors in useSimulatorStore for ESP32 to prevent race conditions.
- Added tests for ESP32 DHT22 sensor registration flow, ensuring proper delegation and fallback mechanisms.
- Created tests for ESP32 Servo and Potentiometer interactions, verifying PWM subscriptions and ADC handling.
- Add useOscilloscopeStore with ring-buffer sample storage and channel management
- Add onPinChangeWithTime callback to AVRSimulator (fires on every bit transition with cycle-derived timestamp)
- Add onPinChangeWithTime callback to RP2040Simulator (fires on GPIO state change)
- Wire oscilloscope callbacks in useSimulatorStore (initSimulator + setBoardType)
- Create Oscilloscope React component with canvas-based waveform rendering
- Add oscilloscope panel to EditorPage (resizable bottom panel, same as SerialMonitor)
- Add 'Scope' toggle button to SimulatorCanvas toolbar
Co-authored-by: davidmonterocrespo24 <47928504+davidmonterocrespo24@users.noreply.github.com>
- Simplified serial data handling in `useSimulatorStore` for both AVR and RP2040 simulators.
- Introduced `boardPinMapping.ts` to map wokwi-element pin names to simulator GPIO/pin numbers for Arduino Uno and Nano RP2040.
- Added `compilationLogger.ts` to parse compile results into structured log entries for better console output.
David Montero Crespo
copilot-swe-agent[bot]