94 lines
5.7 KiB
Markdown
94 lines
5.7 KiB
Markdown
# ESP32-S3 GPIO Mapping
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本文件按当前固件实现校对（代码 + 当前 `sdkconfig`），审计日期：2026-03-02。
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## GPIO Table (Current Build)
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| Board Pin | GPIO | Signal | Direction (Current Build) | Notes |
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| --- | --- | --- | --- | --- |
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| 1 | GND | GND | - | Ground |
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| 2 | 3V3 | 3V3 | - | 3.3V Power |
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| 3 | EN/RST | EN | Input | Chip enable/reset |
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| 4 | IO4 | PRINT_STB5_6 | Output | Printer strobe 5/6 |
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| 5 | IO5 | PRINT_STB3_4 | Output | Printer strobe 3/4 |
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| 6 | IO6 | ES8311_I2C_SDA | Bidirectional | Voice codec I2C SDA |
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| 7 | IO7 | ES8311_I2C_SCL | Output | Voice codec I2C SCL |
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| 8 | IO15 | BATTERY_ADC | Input | Battery voltage ADC detect |
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| 9 | IO16 | PRINT_STB1_2 | Output | Printer strobe 1/2 |
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| 10 | IO17 | PRINT_PAPER | Input | Paper-present level is controlled by `CONFIG_TQ_PRINTER_PAPER_PRESENT_LEVEL` (current: `0`, low means paper present) |
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| 11 | IO18 | NTC_ADC | Input | NTC ADC |
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| 12 | IO8 | PRINT_OUTA_P | Output | Printer OUTA+ |
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| 13 | IO19 | PRINT_OUTA_N | Output | Printer OUTA- |
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| 14 | IO20 | ES8311_PA | Output | PA control |
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| 15 | IO3 | PRINT_OUTB_P | Output | Printer OUTB+ |
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| 16 | IO46 | PRINT_OUTB_N | Output | Printer OUTB- |
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| 17 | IO9 | SPI_SHARED_MOSI | Output | Printer/Screen shared MOSI |
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| 18 | IO10 | PRINTER_MISO | Input | Shared SPI MISO used by current screen driver config |
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| 19 | IO11 | SPI_SHARED_CLK | Output | Printer/Screen shared CLK |
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| 20 | IO12 | SCREEN_DC | Output | ST7789 DC |
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| 21 | IO13 | SCREEN_CS (SCREEN_CS1) | Output | ST7789 CS |
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| 22 | IO14 | MIC_KEY | Input | Mic key (supports ADC-mux extension path) |
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| 23 | IO21 | LED_G | Output | Green LED |
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| 24 | IO47 | POWER_KEY | Input | Active-low power key, long press 2s triggers lifecycle stop and power-off hold release |
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| 25 | IO48 | SCREEN_BACKLIGHT | Output | Backlight active level by `CONFIG_TQ_SCREEN_BACKLIGHT_ACTIVE_HIGH` (current: `y`, high = on) |
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| 26 | IO45 | PRINT_LAT | Output | Printer LAT |
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| 27 | IO0 | KEY_PRINT / BOOST_CTRL | Output (current) / Input (optional) | Current build uses boost mode at boot (`CONFIG_TQ_KEY_PRINT_BOOST_ENABLE_ON_BOOT=y`), so this pin is driven as boost control |
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| 28 | IO35 | N/A | - | Not available |
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| 29 | IO36 | N/A | - | Not available |
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| 30 | IO37 | N/A | - | Not available |
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| 31 | IO38 | I2S_MCLK | Output | Voice I2S MCLK |
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| 32 | IO39 | I2S_BCLK | Output | Voice I2S BCLK |
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| 33 | IO40 | I2S_DI | Input | Voice I2S data in |
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| 34 | IO41 | I2S_WS | Output | Voice I2S WS |
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| 35 | IO42 | I2S_DO | Output | Voice I2S data out |
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| 36 | TXD0 | UART0_TX | Output | Serial log/program |
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| 37 | RXD0 | UART0_RX | Input | Serial log/program |
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| 38 | IO2 | LED_R | Output | Red LED |
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| 39 | IO1 | POWER_HOLD | Output | Must drive high at boot to keep board powered |
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| 40 | GND | GND | - | Ground |
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| 41 | GND | GND | - | Ground |
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## Additional Runtime Pin Behavior
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| Logical Signal | Config | Current Value | Behavior |
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| --- | --- | --- | --- |
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| SCREEN_RESET | `CONFIG_TQ_SCREEN_RESET_PIN` | `-1` | No dedicated reset pin. Runtime falls back to `CONFIG_TQ_SCREEN_BACKLIGHT_PIN` (`IO48`) as reset pin. |
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## Firmware Mapping Notes (Current Implementation)
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- Board pin mapping is configured through `main/Kconfig.projbuild` (`CONFIG_TQ_*`) and resolved from `sdkconfig` at build time.
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- GPIO usage is config-driven. Current code path does not rely on `GPIO_NUM_xx` hardcoded pin numbers.
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- `components/platform/src/platform_bootstrap.c` initializes critical GPIO on startup:
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- `POWER_HOLD` is asserted high early.
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- `LED_R` and `LED_G` default low.
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- `SCREEN_CS/DC/BACKLIGHT` are initialized with configured defaults.
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- `KEY_PRINT` is output boost control when `CONFIG_TQ_KEY_PRINT_BOOST_ENABLE_ON_BOOT=y`, otherwise input with pull-up.
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- `POWER_KEY`, `MIC_KEY`, `PRINT_PAPER` default to input with pull-up.
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- Physical power-key handling uses `managed_components/espressif__button`:
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- Platform layer (`platform_power_key.c`) reports long-press events (`2s`, active-low).
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- Control-plane consumes the shutdown request and performs graceful stop, then calls `platform_power_hold_set(false)` through `system_runtime_power_off()`.
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- Thermal printer runtime behavior (`components/platform/src/thermal_printer.c`):
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- `STB` lines are active-high.
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- `LAT` idles high and is pulsed low-high.
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- Shared `MOSI/CLK` are temporarily switched to GPIO bit-bang for printing.
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- Paper detect compares GPIO level against `runtime_policy_printer_paper_present_level()`.
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- Display stack is:
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- `platform_display_*` (`display_st7789.c`) -> `lcd_module_*` (`display_lcd_module.c`) -> `st7789p3_*` (`display_st7789p3.c`).
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- Current implementation no longer describes panel setup in `display_st7789.c` directly.
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- LCD path includes shared-SPI recovery after printer takes over shared pins.
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- Voice path (`components/platform/src/voice_audio.c`):
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- I2C defaults to `SDA=6`, `SCL=7`, with internal pull-up enabled in both I2C code paths.
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- I2S defaults to `MCLK=38`, `BCLK=39`, `WS=41`, `DOUT=42`, `DIN=40`.
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- `PA` control defaults to `IO20` and polarity can be flipped by `CONFIG_TQ_VOICE_CODEC_PA_PIN_REVERSED`.
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## Condition-Driven Behavior (Important)
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| Config | Current | Impact |
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| --- | --- | --- |
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| `CONFIG_TQ_KEY_PRINT_BOOST_ENABLE_ON_BOOT` | `y` | `KEY_PRINT/BOOST_CTRL` works as output boost-control at boot/runtime instead of key input |
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| `CONFIG_TQ_KEY_PRINT_BOOST_ACTIVE_HIGH` | `y` | Boost enable level is high |
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| `CONFIG_TQ_SCREEN_BACKLIGHT_ACTIVE_HIGH` | `y` | Backlight ON level is high |
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| `CONFIG_TQ_SCREEN_RESET_PIN` | `-1` | Screen reset falls back to backlight pin |
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| `CONFIG_TQ_SCREEN_ENABLE` | `y` | Screen driver and its GPIO paths are compiled in |
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| `CONFIG_TQ_PRINTER_PAPER_PRESENT_LEVEL` | `0` | Paper detect treats GPIO low as paper present |
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