esp32p4-jc-m3-dev

Guition JC-ESP32P4-M3-DEV

An ESP32-P4 carrier with a MIPI display connector, a MIPI camera connector, Ethernet, audio, a card slot, RS485, a battery charger and three USB-C sockets — and a radio that is a second chip you talk to over SDIO.

Three things shape almost every task on this board. First, the P4 has no radio: esp_wifi is not the API, esp_wifi_remote over esp_hosted is, and the ESP32-C6 inside the module needs its own firmware. Second, the silicon comes in two mutually incompatible revisions and ESP-IDF defaults to the wrong one for the boards being sold — the symptom is a bootloader that dies with Illegal instruction, which reads like corrupt flash. Third, there is no user LED: the only thing that lights is the power indicator, so a board that "does nothing" is usually a board that is running fine with its console on the wrong socket.

• reference/board-hardware.md — the board: the module pin list transcribed from the schematic, every P4 GPIO and what this board did with it, the JP1 header with its four trap positions, power tree, Ethernet, I2C, audio, storage, the silicon-revision table, the toolchain including the PlatformIO/SCons breakage, flashing, and a symptom → cause → fix table.
• reference/esp32p4-soc.md — the silicon: why no GPIO is stolen by flash, PSRAM, MIPI or the HS USB PHY; strapping pins; ADC1/ADC2 and touch maps; the three USB controllers; what the P4 has that no other ESP32 does.
• reference/esp32-family.md — the rest of the family, for "should this be a different ESP32?" questions.
• reference/recipes.md — code: platformio.ini, sdkconfig.defaults, silicon-revision and PSRAM detection, SDMMC with the on-chip LDO, I2C, ES8311, MIPI-DSI, GT911, Ethernet, RS485, a 16 MB partition table, the die temperature sensor, Wi-Fi through the C6. Each recipe says whether it was compiled.
• template/ — a project that builds clean, in two variants, plus a scaffold script. See template/README.md.