LCD character display for the MPF-I

The MicroProfessor already has a display, but it is fun to add another.

At bread80.com Mike created just the right approach. Simple as it should be.

The version here is implemented and adapted to the MPF-I, but the hardware is virtually the same. The software is restructured a bit, but no real changes.

This implementation is different from most, like the Arduino interface & library, as it actually reads the busy flag from the HD44780 chip, instead of just waiting a bit after each command.

Usually I need the most advanced tools to find my trival wiring errors. Below the working situation, but without display connected. The program keeps polling the status register.

• Assembly source
• Assembly listing
• KiCAD schema

External links:

• Latest experimental code at github.
• Mikes original blog.
• Source code at github.
• Open Bench Logic Sniffer.
• Logic Analyser Client at github.

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Last update: 2022-03-18