# LCD backlight test

This program only turns on the LCD backlight GPIO.

It does not initialize SPI.
It does not initialize the LCD controller.
It does not write any pixel data.

Set `LCD_PIN_BL` to the GPIO connected to the LCD `BLK` pin.
Set `LCD_BL_ACTIVE_HIGH` to match the board.

Build and flash:

```powershell
idf.py menuconfig
idf.py build
idf.py -p COMx flash
```

Expected result: the LCD backlight turns on and stays on.

## Update image data

Use this script to generate `main/eye_image.c` and `main/eye_image.h` from an
image or GIF:

```powershell
C:\Users\28036\.cache\codex-runtimes\codex-primary-runtime\dependencies\python\python.exe D:\esp\Project\lcd\tools\gif_to_eye_image.py D:\esp\Project\lcd\source\eye2.bmp
```

For GIF files, use `--max-frames` or `--step` if the generated file is too
large.