tscal

Graphical touchscreen calibration.

Usage

tscal <framebuffer> <input>

Description

• Interactive graphical touchscreen calibration tool
• Displays 5 target points (4 corners + center), user taps each in sequence
• Computes a 7-parameter affine calibration matrix using least squares
• Applies calibration via input_ioctl(dev, "touchscreen-set-calibration", ...)
• Outputs calibration array: [a0, a1, a2, a3, a4, a5, a6]
• Automatically restarts on calibration failure (near-singular matrix)
• Press Ctrl-C to exit

Example

tscal fb.0 input.0