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fix: review fixes for the C5 build

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- ADR 0003: the C5 gets its own consequence instead of sitting in the
  ADR 0006 amendment. It names the single-slot table, the chip revision
  minimum (v1.0, CONFIG_ESP32C5_REV_MIN_FULL=100) and the longer WiFi
  scans with 5 GHz.
- platformio.ini: the [esp32] comment names the C5 and C6 as released
  debug builds; the C5 comment no longer repeats the C6's.
- Transceiver: the C5 comment says why TX and RX are 4 and 5.
- CI: the addr_fs comment names both partition tables.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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cjkas 2026-10-28 22:49:42 +01:00
parent 38b5c31b79
commit 0437cd2a88
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docs/adr/0003-pioarduino-idf55.md
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@ -13,7 +13,8 @@ We moved every firmware env from `espressif32 @ 6.13.0` (Arduino 2.0.17 on ESP-I
- **Firmware size.** The ESP32 image grows from 1,382,640 bytes (v3.0.14) to 1,555,472 at `CORE_DEBUG_LEVEL=2`, leaving 17 KB of the 1.5 MB OTA slot. At level 3 it doesn't fit, so release envs build at level 2 (warnings and errors) and debug envs stay at 3. PlatformIO's "Flash:" figure counts ELF sections, not the image, and reads about 45 KB low, so CI checks `firmware.bin` against the app partition and fails under 8 KB free (`.github/size_check.py`).
- **No more C3 builds.** Its image grows by 214 KB to 1,651,216 bytes, 76.5 KB over the OTA slot even at level 2. C3 boards stay on the 3.0.x releases.
> **Amended by [ADR 0006](0006-two-security-modes-eleven-http-routes.md) (4.0.0).** The C3 builds again. Without the old API (ports 8080 and 8081), its image is 1,498,512 bytes at level 2 and leaves 72.6 KB of the OTA slot. It runs on chip revision v0.3 or later only: the framework's C3 libraries are built with `CONFIG_ESP32C3_REV_MIN_3`. Its default radio pins moved off GPIO 12-17, which hold the SPI flash. The C5 is new in 4.0.0 and builds like the C6: a debug build with one 3 MB app slot, updated over USB, since at level 2 its image left only 3.4 KB of the OTA slot.
> **Amended by [ADR 0006](0006-two-security-modes-eleven-http-routes.md) (4.0.0).** The C3 builds again. Without the old API (ports 8080 and 8081), its image is 1,498,512 bytes at level 2 and leaves 72.6 KB of the OTA slot. It runs on chip revision v0.3 or later only: the framework's C3 libraries are built with `CONFIG_ESP32C3_REV_MIN_3`. Its default radio pins moved off GPIO 12-17, which hold the SPI flash.
- **The C5 is updated over USB.** New in 4.0.0. At level 2 its image left 3.4 KB of the OTA slot, under CI's 8 KB, so like the C6 it is released as a debug build with one 3 MB app slot (`esp32_huge_app.csv`), which no OTA can write. The framework's C5 libraries run on chip revision v1.0 or later only (`CONFIG_ESP32C5_REV_MIN_FULL=100`). Its WiFi has 5 GHz too, so the passive scans for the configured network (`src/ESPNetwork.cpp`, 300 ms a channel) cover about 38 channels instead of 13: about 11 s instead of 4 s, depending on the country's channels.
- **Ethernet PHY ids are ours.** Arduino 3.x renumbered `eth_phy_type_t` (`ETH_PHY_GENERIC` is 0). NVS, backups and the web UI keep the Arduino 2.x numbers as `eth_phy_id_t` (`src/EthPhy.h`), translated by name when Ethernet starts. Never cast a stored id to the framework enum.
- **Ethernet only on the original ESP32.** Arduino 3.x has the RMII MAC API only where `CONFIG_ETH_USE_ESP32_EMAC` is set. S3, C3, C5 and C6 build without Ethernet.
- **Updates roll back until proven.** We override the core's `verifyRollbackLater()` hook to return true, and `loop()` marks the new firmware valid once it has run 60 s and the network is up. A reset before then boots the previous firmware. The LittleFS image an update wrote stays, so the old firmware runs with the new web UI.