SPI speed runs up 128M.
LCD pin defenition：
You can install the touch driver for 3.5″touch screen on an existing system, but it just supports Raspbian system.
Step 1: Download the Raspbian OS:https://downloads.raspberrypi.org/raspbian/images/
Step 2:Unzip the file (step 1) using WinRAR.
Step 3:Prepare a new TF (MicroSD) memory card. If your SD card is not new, please format it firstly.
Step4: Write the img.file(step2) to SD card using Win32 Disk Imager utility.Insert this SD card into your raspberry pi.
Step5: You can control PI through ssh,vnc, Remote desktop or the other big HDMI display, please note that Raspberry Pi must be connected to the Internet.
Step6: Driver Installation：
First, change the password of the root account and enable the root account:：
sudo passwd root
sudo passwd –unlock root
Then Open the command terminal,Enter the following commands to download the 3.5″touch screen driver;
sudo git clone https://github.com/kedei/LCD_driver
Step 7:Change file permissions;
sudo chmod -R 777 LCD_driver
Step 8:Enter the folder;
Step 9:Install the driver, RaspberryPi will auto reboot :
Now the touch driver on an existing OS has installed successful, you can connect 3.5 inch screen to your raspberry pi, after a few minutes, 3.5 inch screen will alive.
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