sharp-drm-driver-radxa-zero/README.md

# 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
```