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flipper: Frequency app for the CyberUnicorn console #17

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8 changes: 8 additions & 0 deletions flipper/CLAUDE.md
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Expand Up @@ -76,6 +76,14 @@ venv is enough:
Confirmed working: SDK **1.4.3**, target **f7**, API **87.1**, `darwin-x86_64`
toolchain downloads and builds cleanly.

The Flipper itself (2026-10-21) runs **Momentum mntm-012**, API **87.1**, so `.fap`s
built against release SDK 1.4.3 load on it. Check with `device_info` in `ufbt cli`
(`firmware_api_major/minor`) before trusting that after either side updates.

`ufbt launch` on an app that switches USB to dual CDC (like `apps/frequency`)
ends with `read failed: Device not configured`. That is the USB re-enumerating,
not a failed launch: the app is running.

## Build / run loop

cd apps/<app>
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5 changes: 5 additions & 0 deletions flipper/README.md
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Expand Up @@ -10,5 +10,10 @@ Flipper Zero external applications (`.fap`), built with
| App | What it does |
|---|---|
| [`apps/hello_freq`](apps/hello_freq) | Minimal ViewPort app — draws text, exits on Back. Starting point for new apps. |
| [`apps/frequency`](apps/frequency) | Tag writer for the Frequency CyberUnicorn console. Opens a second USB serial port and answers the console's `system.status`, `system.caps`, `hat.probe`, `frequency.write_tag` and `frequency.read_tag`, so the console writes check-in placards and member cards through the Flipper's NFC. |

Agent conventions and the SDK-grounding rules live in [`CLAUDE.md`](CLAUDE.md).

## Tools

- [`tools/placard_nfc.py`](tools/placard_nfc.py) builds a Flipper `.nfc` file holding one NDEF link, for the stock NFC app's **Write** on a blank NTAG213/215/216. No app needed.
11 changes: 11 additions & 0 deletions flipper/apps/frequency/application.fam
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@@ -0,0 +1,11 @@
App(
appid="frequency",
name="Frequency",
apptype=FlipperAppType.EXTERNAL,
entry_point="frequency_app",
stack_size=4 * 1024,
fap_category="NFC",
fap_description="Lets the Frequency CyberUnicorn console write and read NTAG check-in tags over USB.",
fap_author="hellofrequencylab",
fap_version=(0, 1),
)
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