Board Configuration System

This directory contains board-specific configuration files for different hardware setups.

How to Switch Boards

Edit board_config.h and uncomment the board you want to use:

// ---- SELECT YOUR BOARD HERE ----
#define BOARD_FEATHER_TFT      // Feather RP2350 + 4.0" TFT ST7796
// #define BOARD_PICO2_TFT        // Pico 2 + 4.0" TFT ST7796
// #define BOARD_PICO2_EINK       // Pico 2 + E-Ink Display
// --------------------------------

Important: Only one board should be uncommented at a time!

Available Boards

1. BOARD_FEATHER_TFT

File: board_feather_tft.h
Hardware: Adafruit Feather RP2350 with 4.0" TFT ST7796
Display: ST7796 (480x320 RGB TFT)
Touch: FT6336U capacitive touch
Features: High-speed refresh, backlight control, SD card

2. BOARD_PICO2_TFT

File: board_pico2_tft.h
Hardware: Raspberry Pi Pico 2 with 4.0" TFT ST7796
Display: ST7796 (480x320 RGB TFT)
Touch: FT6336U capacitive touch
Features: High-speed refresh, backlight control, SD card

3. BOARD_PICO2_EINK

File: board_pico2_eink.h
Hardware: Raspberry Pi Pico 2 with E-Ink Display
Display: E-Paper (400x300 monochrome)
Touch: None (configurable)
Features: Ultra low power, BUSY pin for refresh status

Adding a New Board

Create a new header file: board_configs/board_your_name.h
Copy the structure from an existing board file
Update all pin definitions for your hardware
Add a #define BOARD_YOUR_NAME option in board_config.h
Add an #elif defined(BOARD_YOUR_NAME) section

Configuration Structure

Each board config file must define:

Display Settings

BOARD_NAME - Human-readable board name
DISPLAY_WIDTH, DISPLAY_HEIGHT - Screen dimensions
DISPLAY_TYPE_SELECTED - Display driver type (0=ST7796, 2=EPAPER)

Display Pins

DISPLAY_SPI_PORT - SPI instance (spi0 or spi1)
DISPLAY_SCK_PIN, DISPLAY_MOSI_PIN, DISPLAY_MISO_PIN
DISPLAY_CS_PIN - Chip select
DISPLAY_DC_PIN - Data/Command
DISPLAY_RST_PIN - Reset
DISPLAY_BL_PIN - Backlight (-1 for e-ink)
DISPLAY_BUSY_PIN - E-paper busy signal (-1 for TFT)

Touch Settings

TOUCH_TYPE_SELECTED - Touch driver type (0=FT6336U, 1=NONE)
TOUCH_SWAP_XY, TOUCH_INVERT_X, TOUCH_INVERT_Y - Orientation

Touch Pins

TOUCH_I2C_PORT - I2C instance (i2c0 or i2c1)
TOUCH_SDA_PIN, TOUCH_SCL_PIN
TOUCH_INT_PIN - Interrupt
TOUCH_RST_PIN - Reset

SD Card Pins (Optional)

SD_SPI_PORT, SD_CS_PIN, SD_MISO_PIN, SD_MOSI_PIN, SD_SCK_PIN

Timing

SPI_BAUDRATE - SPI clock speed (32MHz for TFT, 4MHz for e-ink)
I2C_BAUDRATE - I2C clock speed (typically 400kHz)

Build Process

The build system automatically uses the selected board configuration:

# Build for currently selected board
mkdir -p build
cd build
cmake ..
make -j4

No need to specify board-specific CMake flags - just edit board_config.h to switch!

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