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4bit/8bit Hitachi HD44780 Ada interface for Raspberry Pi

Ada Interface for Raspberry Pi for controlling a Hitachi HD44780 (2 lines of 16 5*7 characters) display.

Hardware:

  • Raspberry Pi 3 Model B v1.2
  • Hitachi HD44780 2x16 5x7 LCD display

Wiring:

Hitachi HD44780 PIN Raspberry Pi PIN
D0 GPIO9
D1 GPIO10
D2 GPIO22
D3 GPIO27
D4 GPIO17 (See note 1. below)
D5 GPIO4 (See note 1. below)
D6 GPIO3 (See note 1. below)
D7 GPIO2 (See note 1. below)
E (Clock Enable ) GPIO23
RS (Register Select ) GPIO25
RW (Read/Write ) GND (See note 2. below)
VCC +5V from Raspberry Pi (See note 3. below)
  • Note1: In 4 bit mode only pins D4 .. D7 on HD44780 are used.
  • Note2: RW Pulled low to GND since we only write to the display.
  • Note3: Display VCC is +5V from Raspberry Pi but interface voltage is +3.3V (No level converting is needed)

Usage:

  • See HD44780 spec (hd44780.ads) for interface description
  • See main.adb for examlpes of usage
  • See HD44780 datasheet for detailed information about commands etc.
  • Use Gnat Ada version >= Ada2012

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