Introduction

• Raspberry Pi Official 7" lcd screen display will be working . The 7" touch screen monitor for Raspberry Pi gives users the ability to create all-in-one, integrated projects such as tablets, infotainment systems and embedded projects. 

• The 800x480 display connects via an adapter board which handles power and signal conversion. 

•  We can plug keyboard and mouse to the raspberrypi for the userinteraction. 

• Screen resolution 800 x 480 pixels Connects to the Raspberry Pi board using a ribbon cable connected to the DSI port. 

• Adapter board is used to power the display and convert the parallel signals from the display to the serial (DSI) port on the Raspberry Pi. 

• The display works with all existing Raspberry Pi models with RDK images.

Hardware requirement

•    Raspberry Pi 3 Model B+
•    Raspberry Pi Touchscreen LCD Display (7-inch)
•    MicroSDHC Class 10 98 MB/s (Sandisk ultra)
•    Power adapter for raspberrypi
•    Normal headset  for connecting to raspberrypi 3.5mm jack
  
  
  Note: Raspberry Pi Touchscreen LCD Display (7-inch) can be ordered from https://www.amazon.in/Raspberry-Pi-Touchscreen-Display-7-inch/dp/B0153R2A9   

Hardware setup

•  This LCD will connects to the Raspberry Pi board using a ribbon cable connected to the DSI port as shown below. 
  
•  LCD display will be powered using connected wires as shown below.  From 7-inch lcd power 5v pin (pin1) needs to be connected to raspberrypi 5v (Pin2) and Gnd pin(pin5) needs to be connected to raspberrypi gnd pin (pin6). 
  
  
•  Connections to GPIO pins and DSI port.
  
  
• Headset connection to RPI 3.5mm jack for audio
  

Building procedure

•     repo init -u https://code.rdkcentral.com/r/manifests -b rdk-next -m rdkv-nosrc.xml
•     repo sync --no-tags
•     source meta-cmf-raspberrypi/setup-environment
•     select meta-cmf-raspberrypi/conf/machine/raspberrypirdkhybrefapp-seven-inch-lcd.conf
•     bitbake  rdk-generic-hybrid-refapp-image

Verification

•     After boot-up we can verify that application(Ex:appmanager) will be fitted into 7-inch display resolution as shown below:

•     We can verify inside refapp image also.
       
  

DEBUG Logs

• For confirming resolution user can see the logs by watching journalctl on particular service.

          Example:
           journalctl -x -u appmanager

• Also user can launch runAppmanager directly for observing console logs.
  systemctl stop appmanager
  sh /lib/rdk/runAppmanager

Test cases

•     On 7-inch display we can verify all features like 

1.       westeros_test(compositor test application)
2.       Browser applications like rdkbrowser2
3.       playback through gstreamer plugins
4.       rmfApp playback
5.       aamp playback
6.       spark applications, appmanager and refapp etc.

•    Attached system test plan will covers all these test cases.

Reference

•  https://thepihut.com/blogs/raspberry-pi-tutorials/45295044-raspberry-pi-7-touch-screen-assembly-guide
•  https://www.raspberrypi.org/documentation/hardware/display/ 
•  https://learn.pimoroni.com/tutorial/pi-lcd/getting-started-with-raspberry-pi-7-touchscreen-lcd