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Poll ISO 14443A in addition to ISO 15693 (groundwork for other tag types) #93
Description
Background
The 1.0 firmware only looks for ISO 15693 (NFC-V) tags. The reader chip and the vendored ELECHOUSE library also support ISO 14443A, which is what MIFARE Classic and NTAG tags use. This issue is the shared groundwork for the tag-type issues linked below.
Scope
- Add a polling cycle that alternates technologies on the existing NFC worker, without changing how ISO 15693 tags are read or written today.
- Report which technology a tag was found with in the NFC snapshot, so the UIs can say "tag found, not supported yet" instead of staying on
PLACE A TAG. - Keep the NFC worker as the only owner of the I2C bus and of NFC state.
Things to settle first
- NFC polling shares one task with backend HTTP calls (
backend_worker.cpp). Measure how much a second technology slows tag detection and removal detection. - How the weighing and tag-removal logic should behave when two technologies are polled in turn.
- The writer's source and ELF allow-list checks (
tools/check_production_nfc.py) must still hold. Polling is read-only and should not widen the write path.
Acceptance
- ISO 15693 behaviour is unchanged, shown by the existing tests plus a new test for the polling scheduler.
- A tag from another technology is reported as found and unsupported on the touchscreen and in the browser.
- Hardware check: detection and removal timing with an OpenPrintTag tag, before and after, recorded in the PR.
Part of the tag-support roadmap in the README.
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Activity
Detect ISO 14443A tags next to ISO 15693 (#93, 1.0.1-beta.5)
Merge pull request #103 from 76cb/claude/inspiring-allen-yra5xq
76cb commentedon Oct 21, 2026
Status on
mainat f2f880c (1.0.1-beta.5, pre-release, PR #103):src/nfc/poll_schedule.hpp). Host tests cover the ordering, the one tolerated missed poll, two tags, and NFC-V winning over a tracked NFC-A tag.unsupported_technologywith NFCID1, SAK, ATQA and a kind from the SAK. Touchscreen and browser say "Tag type not supported yet". Nothing is read from it and the workflow ignores it.tools/check_production_nfc.pypermits exactly the three detection calls and forbids T2T, ISO-DEP and NFC-DEP routines in the ELF (both passed in CI).Not done, so not closing: the hardware check (detection and removal timing with an OpenPrintTag before and after, and NTAG / MIFARE Classic detection on a station). The steps are in PR #103's description; please record the numbers here.
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