RPI Display

- new wiki page: https://w2.electrodragon.com/board-series-dat/RPI-LCD/RPI-LCD-dat.md

• More debug info please see RPI Debug

1.8 SPI LCD

• Demo code for SPI LCD here.

Alternative Method GPIO LCD

• Use latest system
• sudo nano /boot/config.txt -> add ->

dtparam=i2c_arm=on,spi=on
dtoverlay=pitft28-resistive, rotate=270 speed=48000000 fps=30

• Make debug monitor on screen -> sudo nano /boot/cmdline.txt before“rootwait” -> add -> fbcon=map:10 fbcon=font:VGA8x8

Enter into graphic system

• sudo nano ~/.profile -> add -> export FRAMEBUFFER=/dev/fb1
• raspi-config -> Enable Boot to Desktop/Scratch” -> ”Desktop log in as user ‘pi’ at the graphical desktop

Schematic

• 

  1.44 RPI LCD

• 

  1.8 RPI LCD

• 

  3.2 inch and 3.5 SPI LCD with touch, interface

• 

  RPI2VGA SCH

HDMI

Vendor GoodDisplay

• Github - https://github.com/goodtft/LCD-show
• For latest RPI image, HDMI display work directly, you can choose install for touch function or not.
• Installation

for 5 -> sudo ./LCD5-show

• important, if display blink, make sure USB power is enough, otherwise attach usb power to display too
• make sure no other pins used touch screen GPIOs

Note

• change back to traditional LCD -> sudo ./LCD-hdmi

DPI - LCD

VGA

• Copy the file bin to system root folder File:Dt-blob-1.zip
• Edit config.txt file and add

enable_dpi_lcd=1 
display_default_lcd=1

• Change DPI resolution by following commands, following is 1080p@60, more info please see http://elinux.org/RPi_Configuration at HDMI mode section

dpi_group=2 
dpi_mode=82

• or 1366×768@60

dpi_group=2 
dpi_mode=86

• If use 3B, please use latest raspbian system, and add following two times to turn off uart and bluetooth.

#disable the bluetooth only for pi3
dtparam=uart1=off
dtoverlay=pi3-disable-bt-overlay

Debug

• Also turn off SPI, IIC, Serial, 1-wire, remote IO in raspi-config in case
• Plug VGA before power up.

E-Paper

• Side pins for arduino, not soldered
• Freeze screen when lose power
• Very simple demo from arduino, not continue show..