¶ Set your small TFT display to DPI
¶ DPI (PARALLEL DISPLAY INTERFACE)
Source : https://www.raspberrypi.org/documentation/hardware/raspberrypi/dpi/README.md
A parallel RGB interface up to 24 bits is available on all Raspberry Pi boards with the 40-way header (A+, B+, Pi2, Pi3, Zero) and the compute module. This interface allows to connect parallel RGB displays to the Raspberry Pi GPIO either in RGB24 (8 bits for red, green and blue) or RGB666 (6 bits per color) or RGB565 (5 bits red, 6 green and 5 blue).
This interface is controlled by the GPU firmware and can be programmed by a user via special config.txt parameters and by enabling the correct Linux device tree overlay.
Sending data via this parallel interface, you have no problems with bus bandwidth and display speed (FPS). But it uses almost all GPIO pins.
This mode is very useful, you can fine-tune your display parameters: timings, resolutions, etc.
This mode is accompanied by new overlays, which allow to produce an RGB signal thanks to the VGA666 (get the 666 passive VGA adapter for Raspberry-Pi B+ : code and hardware).
dtoverlay=vga666
You will be able to use Adafruit's 5" or 7" TFT display with the Adafruit Kippah DPI TFT panel for Raspberry Pi with touch support.
dtoverlay=dpi24
¶ Setting up
- You need to open the file recalbox-user-config.txt with nano or vim and add the following lines:
dtoverlay=dpi24
¶ Geekwrom HD 3.5 inch 800x480 TFT screen
This screen is small in size and offers a resolution of 800x480. Its specifications are quite good:
This amazing screen can be found on this Chinese site for less than 50€.
It can be used as is, without the fbcp program. Fbcp is not necessary anymore because the DPI mode uses directly the GPU.
To get the support of this screen, you just have to add the following lines to your file recalbox-user-config.txt
¶ Setting up
- You must open the file recalbox-user-config.txt with nano or vim and add the following lines:
# 3.5 HD tft screen 800x480
dtoverlay=dpi24
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
# Banggood
framebuffer_width=800
framebuffer_height=480
dtparam=spi=off
dtparam=i2c_arm=off
enable_dpi_lcd=1
display_default_lcd=1
dpi_output_format=0x6f015
dpi_group=2
dpi_mode=87
hdmi_timings=480 0 16 16 24 800 0 4 2 2 0 0 0 60 0 32000000 6
display_rotate=3
- Save the file and restart your Recalbox. You can now view the incredible images displayed on this screen.
¶ Adafruit 5" and 7" TFT display
To use these 5" and 7" displays, you will need the Adafruit Kippah DPI TFT panel for Raspberry Pi with touch support to operate them.
¶ Setting up
- You need to open the file recalbox-user-config.txt with nano or vim and add the following lines:
#3.5 HD tft screen 800x480
dtoverlay=dpi24
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
#Adafruit
framebuffer_width=800
framebuffer_height=480
dtparam=spi=off
dtparam=i2c_arm=off
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
dpi_output_format=0x6f005
hdmi_timings=800 0 40 48 88 480 0 13 3 32 0 0 0 60 0 32000000 6
display_rotate=3
¶ 4.0" HyperPixel screen
Thanks glook for this tuto : https://forum.recalbox.com/topic/17854/ecran-hyperpixel-4-pouces/4
This screen is available here with or without touch screen.
Start by reading the Github here. You will need to follow these steps:
¶ Set up
Depending on your board, the source code to use will be different. See the manual installation part to know which source code you should use.
Once you have chosen the right source code, here are the steps to follow:
- Download the source code by clicking on the big green
Codebutton and choose to download in.zipformat. - Unzip the archive and place the extracted directory in
/recalbox/share/system/. - Log in via SSH and go to the directory you just put in your Recalbox.
- Mount the boot partition as read/write.
- Compile hyperpixel4.dts into hyperpixel4.dtbo :
dtc -@ -I dts –O dtb –o dist/hyperpixel4.dtbo src/hyperpixel4.dts
- Copy the
hyperpixel4.dtbofile to/boot/overlays/.
cd dist
cp hyperpixel4.dtbo /boot/overlays/
- Modify the file recalbox-user-config.txt with nano or vim and add the following lines:
# Paramètres de l'écran LCD HyperPixel
dtoverlay=hyperpixel4
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
framebuffer_width=800
framebuffer_height=480
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
dpi_output_format=0x7f216
display_rotate=3
hdmi_timings=480 0 10 16 59 800 0 15 113 15 0 0 0 60 0 32000000 6
- Make sure the i2c and spi are turned off:
dtparam=i2c_arm=off
dtparam=spi=off
- Copy
hyperpixel4-initlocated in the/distdirectory to/usr/bin/on Recalbox.
cp -R /dist/hyperpixel4-init /usr/bin/
- Make sure you run this program at startup in Recalbox, by adding
hyperpixel4-initto the command line in one of the init scripts in/etc/init.d.