docs: add initial project documentation
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# Board passport
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## Identification status
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The target PCB has not been identified from physical markings. No photograph
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of the markings is available in the repository and no `sources/` directory is
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present. A read-only `esptool.py flash_id` probe did identify the installed SoC
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and flash, but it cannot identify the PCB manufacturer, board model/revision,
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built-in LED, or board-specific pinout.
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Required evidence to unblock Milestone 000:
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- clear photographs of both sides of the board, including all PCB and module
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markings;
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- the manufacturer's product page, schematic, and pinout matching those
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markings;
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- the PCB/model ordering code that matches the photographs.
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## Confirmed electronically
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On 2026-08-27, the board appeared as `/dev/ttyACM0` with USB VID:PID
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`303a:1001` and product name `Espressif USB JTAG/serial debug unit`.
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`esptool.py` 4.11.0 reported:
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- ESP32-C6FH4 in QFN32, chip revision 0.2;
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- 4 MB embedded flash, with 4 MB detected;
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- 40 MHz crystal;
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- native USB-Serial/JTAG mode.
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The ESP32-C6FH4 ordering code and probe establish the 4 MB in-package flash.
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No PSRAM was reported. These are chip-level facts; they do not establish the
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carrier PCB model or its LED and pin routing.
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## Current repository baseline (not hardware confirmation)
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| Item | Observed value | Status |
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| ---------------------------- | ------------------------------- | --------------------------------------------------------------------- |
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| PlatformIO Core | 6.1.19 | Installed locally |
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| PlatformIO platform | `platformio/espressif32` 7.0.1 | Installed locally; `platformio.ini` is not version-pinned |
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| Framework | ESP-IDF 6.0.1 | Current project setting conflicts with the Arduino-first MVP baseline |
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| Arduino Core | Not installed | Cannot be pinned and verified against this board yet |
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| PlatformIO board | `esp32-c6-devkitm-1` | Unverified candidate, not evidence of the physical model |
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| Board-profile flash size | 4 MB | Unverified; profile metadata only |
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| Detected physical flash size | 4 MB | Confirmed by `esptool.py flash_id` |
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| Generated SDK flash size | 2 MB | Conflicts with the detected hardware and board profile |
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| Generated partition table | Single application, no LittleFS | Does not meet Milestone 000 |
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The current configuration is not yet a reproducible baseline: its generated
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SDK configuration must be changed from 2 MB to the confirmed 4 MB and its
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partition table must add LittleFS before firmware is uploaded.
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## Candidate reference only
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If the physical markings prove that the board is an Espressif
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ESP32-C6-DevKitM-1, the matching authoritative references are:
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- [ESP32-C6-DevKitM-1 user guide](https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32c6/esp32-c6-devkitm-1/user_guide.html)
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- [ESP32-C6-DevKitM-1 schematic](https://docs.espressif.com/projects/esp-dev-kits/en/latest/_static/esp32-c6-devkitm-1/schematics/esp32-c6-devkitm-1-schematics.pdf)
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- [ESP32-C6-MINI-1 datasheet](https://www.espressif.com/sites/default/files/documentation/esp32-c6-mini-1_mini-1u_datasheet_en.pdf)
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For that board only, Espressif documents an ESP32-C6-MINI-1(U) module with
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4 MB in-package SPI flash, no PSRAM, a USB-C connector connected through a
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USB-to-UART bridge, UART0 on GPIO16/GPIO17, native USB D-/D+ on GPIO12/GPIO13,
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and an addressable RGB LED on GPIO8. These values are deliberately not adopted
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as the target specifications until the markings match.
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## Memory map and partition status
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No partition CSV has been selected yet. The confirmed 4 MB capacity permits a
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layout reserving, at minimum, NVS, PHY initialization, one application
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partition, and one LittleFS data partition. Exact offsets and sizes still need
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to be defined and checked against the framework's bootloader and partition
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alignment requirements.
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## Risks carried to the next action
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- A generic “ESP32-C6 Mini” may not match Espressif's DevKitM-1 pinout, LED
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polarity/type, or USB bridge. The flash capacity is confirmed independently.
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- GPIO8, GPIO12, GPIO13, GPIO16, and GPIO17 must not be assigned from the
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candidate documentation until the exact board is confirmed.
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- Official `platformio/espressif32` 7.0.1 exposes the C6 DevKitM profile only
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for ESP-IDF and its bundled Arduino Core 2.0.17 does not support ESP32-C6.
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An exact Arduino-compatible PlatformIO platform/Core pairing must be chosen
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and pinned after the board is identified, then proven by Milestone 001.
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