WAVESHARE 4 INCH HDML LCD, 800X480, ISP GUIDE

1. Screen introduction

• High resolution: 800x480
• Resistive touch control
• Using IPS technology, high quality and perfect displaying
• Compatible and direct-connect with any revision of Raspberry Pi (except the Pi 1 Model B or Pi Zero, which requires an HDMI cable)
• The driver is provided to work with Raspbian/Ubuntu
• Also works as a computer monitor, in this case, a touch panel is unavailable and an HDMI cable is required
• HDMI interface for displaying, no I/Os required (however, the touch screen still needs I/Os)
• The backlight can be turned off to lower power consumption

2. Interface 

3. Installation and screen using

A. Preparation

- a screen Waveshare 4inch HDMI LCD.

- a set of operating system pre-installed Raspberry Pi, here we use Rasbian (Raspberry Pi 1 Model B or Pi Zero, which requires an HDMI cable). Moreover, you can use the Rasbian operating system provided by Waveshare that had a pre-installed driver for the screen. You just need to install and use it. It can be available on CD or can download to the https://drive.google.com/file/d/0BxFRtACVZx9fdmk1R1U3bzR4WUk/view         

B. Getting started

We assemble it as follows:

C. Program Installation

We need to edit file config.txt in the Rasbian operating system to recognize the screen and install the touch driver. The first is editing file config, you just need to open the SD card that was installed in the operating system and you will see the file immediately. Then open that file and paste the code and save.

hdmi_group=2

hdmi_mode=87

hdmi_cvt 480 800 60 6 0 0 0

dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900

display_rotate=3

After that, we contact the link  http://www.waveshare.com/w/upload/4/4b/LCD-show-161112.tar.gz  to download or access this link http://www.waveshare.com/wiki/4inch_HDMI_LCD to download the driver. After downloading, uncompress, and copy the file LCD-show into CD card. Now insert the memory card into the Pi and activate. Currently, Pi has received the screen but not yet received the touch. Now open Terminal and type the following command:

cd /boot/LCD-show/

./LCD4-800x480-show

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