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Pi400VT100

VGA & Serial interface for Raspberry Pi 400

DPI (Display parallel Interface)

Like VGA666, this pcb uses dpi interface (in mode 7, and 3x4bits to free gpio 12 to 15)

see https://www.raspberrypi.org/documentation/hardware/raspberrypi/dpi/README.md

only the necessary bits of the dpi are redirected to the 40-pin GPIO port, with the 'gpio=2-3,8-11,16-19,24-27=a2' line on config.txt

/boot/config.txt

# replace dtoverlay=vc4-kms-v3d with
dtoverlay=vc4-fkms-v3d

# disable i2c, pin use by h-sync & v-sync
dtparam=i2c_arm=off
gpio=2-3,8-11,16-19,24-27=a2
dpi_output_format=0x17
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=16
#---------------- dpi_mode line ---------------------
#---> 640x480 60hz    dpi_mode=4
#---> 800x600 60hz    dpi_mode=9
#---> 1024x768 60hz   dpi_mode=16
#---> 1280x768 60hz   dpi_mode=23
#---> 1280x800 60hz   dpi_mode=28
#---> 1280x960 60hz   dpi_mode=32
#---> 1280x1024 60hz  dpi_mode=35
#---> 1360x768 60hz   dpi_mode=39
#---> 1366x768 60hz   dpi_mode=81
#---> 1400x1050 60hz  dpi_mode=42
#---> 1440x900 60hz   dpi_mode=47
#---> 1600x1200 60hz  dpi_mode=51
#---> 1680x1050 60hz  dpi_mode=58
#---> 1920x1080 60hz  dpi_mode=82
#---> 1920x1200 60hz  dpi_mode=69
#---> 1920x1440 60hz  dpi_mode=73

Serial port

# Enable Uart /dev/ttyAMA1, on pin 12,13,14,15
dtoverlay=uart5,ctsrts

Schematic

PCB

Installation

copy content of config-example.txt to /boot/config.txt

install Minicom

sudo apt update
sudo apt upgrade
sudo apt install minicom

run minicom with default config

minicom -D /dev/ttyAMA1

run minicom 9600bps 8bit

minicom -b 9600 -8 -D /dev/ttyAMA1

Révision

rev1 bad space between VGA and DB9 connectors

rev2