T-Display (ST7789) with Zephyr 4.2.99

This is a sample project demonstrating how to set up and use a T-Display esp32 board (ST7789) with Zephyr RTOS 4.2.99.

Hardware Requirements

• T-Display with ST7789 controller (240x135 resolution)
• USB data cable for programming and power

Building and Flashing

To build and flash the project with base ESP32 DevKitC board with T-Display:

west build -p always -b esp32_devkitc/esp32/procpu -- -DDTC_OVERLAY_FILE=boards/esp32_devkitc_st7789v.overlay
west flash --esp-baud-rate 460800

Prerequisites

• Zephyr SDK installed
• West tool installed
• ESP32 toolchain configured (west blobs fetch hal_espressif command)
• T-Display board (ST7789) connected to your computer

Troubleshooting

If you encounter issues:

1. Ensure the T-Display is properly connected to the ESP32
2. Check that the device tree overlay is correctly applied (esp32_devkitc_st7789v.overlay)
3. Try to lower the baud rate (--esp-baud-rate) if there is an issue with flashing
4. Make sure Zephyr 4.2.99 is properly installed and initialized (~/zephyrproject/zephyr/zephyr-env.sh)
5. Ensure the display backlight pin is enabled (backlight with GPIO 4)

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