Sharp Memory LCD Kernel Driver

Note: I did not write this driver. I only modified it to clean up compiler warnings/errors. The original can be found here: (http://www.librecalc.com/en/wp-content/uploads/sites/4/2014/10/sharp.c)

More information can be found here: (http://www.librecalc.com/en/downloads/)

This driver is for the LS027B7DH01. It should work with other Sharp Mem LCD displays by modifying all 400/240 references with the correct dimensions for your screen.

Hookup Guide

Connect the following pins:

Display	RasPi
VIN	3.3V
3V3	N/C
GND	GND
SCLK	11 (SCLK)
MOSI	10 (MOSI)
CS	23
EXTMD	3.3V
DISP	24
EXTIN	25

Compile/Install the driver

Verify that you have the linux kernel headers for your platform. For the RasPi these can be obtained by:

sudo apt-get install raspberrypi-kernel-headers

or more generally:

sudo apt-get install linux-headers-$(uname -r)

To compile the driver, run:

make

To install the driver, run:

sudo make modules_install

If you want the module to load at boot you'll need to add it to the /etc/modules file, like:

...
# This file contains...
# at boot time...
sharp

Compile/Install the Device Tree Overlay

The included sharp.dts file is for the Raspberry Pi Zero W. To compile it, run:

dtc -@ -I dts -O dtb -o sharp.dtbo sharp.dts

To load it at runtime, copy it to /boot/overlays:

sudo cp sharp.dtbo /boot/overlays

And then add the following line to /boot/config.txt:

dtoverlay=sharp

Console on Display

If you want the boot console to show up on the display, you'll need to append fbcon=map:10 to /boot/cmdline.txt after rootwait, like:

... rootwait ... fbcon=map:10

To make sure the console fits on screen, uncomment the following lines in /boot/config.txt and set the resolution appropriately:

framebuffer_width=400
framebuffer_height=240