FlexLCD

FlexLCD is a portable C driver for HD44780-compatible alphanumeric LCD displays featuring a clean Hardware Abstraction Layer (HAL) architecture.

The library is designed to run on a wide range of platforms including Arduino, Raspberry Pi, Linux SBCs, and bare-metal microcontrollers.

The driver core is written in pure C, allowing it to be reused across embedded and desktop environments while keeping platform-specific code isolated in HAL implementations.

Features

• HD44780 compatible LCD driver
• 4-bit and 8-bit bus support
• Clean Hardware Abstraction Layer (HAL)
• Platform-agnostic core driver
• Works with microcontrollers and Linux systems
• Small footprint suitable for low-resource MCUs
• No dynamic memory allocation
• Reentrant driver design
• Easily portable to new platforms

Supported Platforms

FlexLCD is designed to be portable. The core driver does not depend on any specific hardware.

Current or planned HAL implementations include:

| Platform | HAL | |--------|--------| | Arduino | arduino_hal | | Raspberry Pi / Linux | rpi_hal (libgpiod) | | AVR | avr_hal AVR GCC | | PIC16 | pic_hal_mini pic_hal XC8 | | ESP32 | ESP-IDF / Arduino | | RP2040 | pico_hal |

Additional HAL implementations can easily be created for new platforms.