raspi-lcd-driver

ERM12864-2 LCD graphic module control for Raspberry Pi.

Written for a Raspberry Pi 1 model B running ArchLinux ARM.

Hardware setup

The ERM12864-2 Display is interfaced with the Raspberry Pi using GPIOs

The GPIOs are on TTL levels (+5V) while the LCD I/Os level is 3.3V => a voltage adaptation circuit is needed

Mapping

RS   => GPIO 23  
RW   => GPIO 24  
E    => GPIO 11  
RST  => GPIO 9  
CS1  => GPIO 10  
CS2  => GPIO 22  
DB0  => GPIO 18  
DB1  => GPIO 15  
DB2  => GPIO 14  
DB3  => GPIO 2  
DB4  => GPIO 3  
DB5  => GPIO 4  
DB6  => GPIO 17  
DB7  => GPIO 27  

Software componemts

This repository provides 3 components

###liblcd.so

Provides an interface to send commands to the LCD.

###lcd-controllerd

Designed to be run in background (e.g. with start-stop-daemon). Interfaced with the LCD using the liblcd.so. Open an UNIX socket and listen for messages.

###lcd-controllerd-cli

Used to send messages to the lcd-controllerd's socket.

lcd-controllerd-cli -h for help.

Use it for:

• turn ON/OFF the LCD
• Clear the display
• Print a 128 × 64 Black and White BMP
• Print text
• Store the current screen in a BMP file
• Stop the lcd-controllerd daemon

Exemples

lcd-controllerd-cli -p /usr/local/share/lcd-controllerd-cli/linux.bmp
lcd-controllerd-cli -t "Uptime: $(uptime | sed -n 's/^.*up\s*\([0-9]*\)\s*days.*$/\1/p') days"

Installation

On target

./make.sh -b
cd build
sudo make install

liblcd.so => /usr/local/lib
lcd-controllerd => /usr/local/bin
lcd-controllerd-cli => /usr/local/bin
linux.bmp => /usr/local/share/lcd-controllerd-cli

Cross compilation

./make.sh -h

for help