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fm1-mocky

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Mocky: pictures on the M-VAVE FM-1's screen, sent from the browser (custom firmware + web app)

fm1-mocky is custom firmware for the M-VAVE FM-1, by @charlesvestal. Open source under GPL-3.0, latest release v0.9.1 (October 2026), 3 stars on GitHub.

forM-VAVE FM-1·by@charlesvestal

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mocky-0.9.1.fwsc· 595 KB

GPL-3.0· charlesvestal/fm1-mocky·charlesvestal.github.io/fm1-mocky/·downloads come from the creator’s GitHub releases

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Mocky for the M-VAVE FM-1

Mocky shows pictures on the FM-1's 240 × 240 screen, sent from a web page over the USB cable. It is for checking screen mockups on the real hardware: the colours, the sizes, how text reads at arm's length.

The welcome screen A FoMni-1 screen, shown by Mocky An AMB-1 screen in a slideshow

  • Send pictures (Chrome or Edge): https://charlesvestal.github.io/fm1-mocky/app/

  • Install it (Chrome or Edge, with the FM-1 plugged in): https://charlesvestal.github.io/fm1-mocky/install/

  • Download the firmware file: releases

  • Send a picture: open the page in Chrome or Edge, click Connect, drop a picture. Fit, Fill, Stretch or 1:1; an optional dither for photos and gradients. The page shows exactly what the screen will show (RGB565).

  • Watch a file: pick a file on disk and the page sends it again each time it changes (not kept): export from your design tool over the same file and the FM-1 follows.

  • The gallery: pictures sent with "Keep" stay in the FM-1's flash (276 KB; flat mockups take a few KB each, a photo ~116 KB; up to 64), and the FM-1 starts on the last one shown.

On the FM-1:

white keyspictures 1–16 (their lights: the kept ones; the one shown blinks)
OCT− / OCT+, SELECT, ALGORITHM, PRESETS, KNOB 1–3previous / next
PLAYslideshow on / off; KNOB 4 sets the pace (1–30 s)
SAVEkeep the picture just sent without "Keep" (it blinks while there is one)
HOMEwhich picture this is, and the room left

Screen reader

Mocky tells the FM-1 Screen Reader what it shows, over USB: which picture is on the screen ("picture 3 of 7"), a picture arriving from the page and whether it was kept, the slideshow, the room left, and what each button did. A picture itself can't be put in words, so the reader says what Mocky knows about it. Open the reader page in Chrome with the FM-1 plugged in; it speaks with its own voice, or hands the text to your computer's screen reader. (Its SysEx, F0 7D 53 52, shares the cable with the pictures' F0 7D 4D.)

Felucca's safety stays: OCT− + OCT+ held 5 s for update mode, safe mode after two failed starts, the web installers can put any firmware (or M-VAVE's) back.

Build, test, run

./build.sh                                   # build/mocky.fwsc (identity FM-1_100; --release X.Y)
sh tests/run_tests.sh                        # host tests, web coder, the whole app in the simulator (and the reader)
python3 tools/fm1_install.py build/mocky.fwsc --yes   # flash the attached FM-1
cd web && python3 -m http.server 8000        # then http://localhost:8000/ in Chrome

How it works: web/mocky.js scales the picture to 240 × 240, reduces it to RGB565 and run-length codes it, then sends it in SysEx messages (F0 7D 4D ...), one reply each, resuming where the FM-1 says it is. firmware/src/app/mock.c takes them, checks the CRC, decodes into a framebuffer and, if asked, appends it to the gallery in flash (0x97000–0xDBFFF, Felucca's data area). Both files document the format and the protocol.

Built on Felucca by Leo Kuroshita (@kurogedelic), Hügelton Instruments, by way of FoMni-1. GPL-3.0-only. M-VAVE and FM-1 are trademarks of their respective owners.