LCD Library with Read Write, Become Familaure, Migrate Factory Test to Use These Features

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I'm always frustrated when the factory test requires a human to make observations of something a machine might.

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Factory Test

Use the bidirectional nature of the I2C interface to the LCD to test and report success / failure of the manufacturing of the Krake for LCD circuitry.

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This library: https://github.com/duinoWitchery/hd44780
has bidirectional interface to LCD.

In addition to adding features possibly useful in the GPAD_API, it has features useful for factory test.

• API functions return a status to indicate whether successful
• automatic detection and s/w work around for LCD keypad shields with bad backlight circuit
• self configuration of i2c address and pin mappings for i2c backpacks
• ability to tell if lcd initialization failed
• ability to read data or status from the LCD (requires r/w control)
• ability to tell if sending a raw command to the LCD failed

The author clearly thought of use cases for testing / verifying connectivity to LCD modules.

Beyond Factory Test

If these features make sense recommend changes to the GPAD_API to use these features.