VGA interface for Raspberry Pi Zéro & 2,3,B+
for pi400 see https://github.com/llegoff/Pi400VGA
buy rev3 on ebay 📦
Like VGA666, this pcb uses dpi interface (in mode 3 to free gpio 18 & 19)
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 vga565.dtbo file loaded at startup
here is the code of the file:
/dts-v1/;
/plugin/;
/{
compatible = "brcm,bcm2708";
// There is no VGA driver module, but we need a platform device
// node (that doesn't already use pinctrl) to hang the pinctrl
// reference on - leds will do
fragment@0 {
target = <&leds>;
__overlay__ {
pinctrl-names = "default";
pinctrl-0 = <&vga565_pins>;
};
};
fragment@1 {
target = <&gpio>;
__overlay__ {
vga565_pins: vga565_pins {
brcm,pins = <2 3 4 5 6 7 8 12 13 14 15 16 17 20 21 22 23 24>;
brcm,function = <6>; /* alt2 */
brcm,pull = <0>; /* no pull */
};
};
};
};
/boot/config.txt
# disable i2c, pin use by h-sync & v-sync
dtparam=i2c_arm=off
dtoverlay=vga565
dpi_output_format=0x13
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
alternate config, no need dtbo file
# replace dtoverlay=vc4-kms-v3d with
dtoverlay=vc4-fkms-v3d
# disable i2c, pin use by h-sync & v-sync
dtparam=i2c_arm=off
gpio=2-8,12-17,20-24=a2
dpi_output_format=0x13
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
Configuration working with vc4-kms-v3d
dtoverlay=vc4-kms-dpi-generic,rgb565-padhi
dtparam=hactive=800,hfp=40,hsync=128,hbp=88
dtparam=vactive=600,vfp=1,vsync=4,vbp=23
dtparam=clock-frequency=40000000
# Resolution@freq hactive hfp hsync hbp vactive vfp vsync vbp clock-frequency
#VGA 640x480 @60 640 16 96 48 480 10 2 33 25175000
#SVGA 800x600 @60 800 40 128 88 600 1 4 23 40000000
#XGA 1024x768 @60 1024 24 136 160 768 3 6 29 65000000
#VESA 1368x768 @60 1368 72 144 216 768 1 3 23 85860000
#VESA 1280x800 @60 1280 64 136 200 800 1 3 24 83460000
#VESA 1280x1024 @60 1280 48 112 248 1024 1 3 38 108000000
#VESA 1400x1050 @60 1400 88 152 240 1050 1 3 33 122660000
#VESA 1600x1200 @60 1600 64 192 304 1200 1 3 46 162000000
#--- TV -----
#244p (NTSC res)@60 320 4 30 46 240 4 5 14 6400000
#288p (PAL res) @50 384 16 32 40 288 3 2 19 7363200
#480i (NTSC res)@60 640 24 64 104 480 3 6 34 13054080
#576i (PAL res) @50 768 24 72 88 576 6 5 38 14875000
#480p @60 640 24 96 48 480 11 2 32 25452000
#720p @60 1280 110 40 220 720 5 5 20 74250000
#1080p @60 1920 88 44 148 1080 4 5 36 148500000
#more timming on http://tinyvga.com/vga-timing
# disable i2c, pin use by h-sync & v-sync
dtparam=i2c_arm=off
gpio=2-8,12-17,20-24=a2
dpi_output_format=0x13
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
#hdmi_timings=506 1 8 48 56 240 1 3 10 6 0 0 0 60 0 9600000 1
#hdmi_timings=512 1 16 48 64 288 1 3 5 6 0 0 0 50 0 9600000 1
# Custom 15kHz mode
hdmi_timings=506 1 8 44 52 240 1 6 10 6 0 0 0 60 0 9600000 1
#hdmi_timings=320 1 17 33 34 224 1 14 8 18 0 0 0 60 0 6400000 1
#hdmi_timings=960 0 173 8 0 160 0 40 10 0 0 0 0 60 0 19200000 8
#hdmi_timings=320 1 25 30 30 240 1 9 3 10 0 0 0 60 0 6400000 1
#hdmi_timings=1920 1 52 208 260 240 1 6 10 6 0 0 0 60 0 38400000 1
for recalbox see https://recalbox.gitbook.io/tutorials/v/francais/video/crt/configurez-votre-ecran-cathodique-sur-le-bus-dpi-vga666-piscart-rgbpi
on the pi4 and pi400, the dual screen function is supported by the vc4 fkms v3d driver
[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
for previous versions:
edit file /boot/config.txt
at the end of the file, add line:
[all]
#dtoverlay=vc4-fkms-v3d
max_framebuffers=2
edit file /usr/share/X11/xorg.conf.d/99-fbturbo.conf
This is a minimal sample config file, which can be copied to
# /etc/X11/xorg.conf in order to make the Xorg server pick up
# and load xf86-video-fbturbo driver installed in the system.
#
# When troubleshooting, check /var/log/Xorg.0.log for the debugging
# output and error messages.
#
# Run "man fbturbo" to get additional information about the extra
# configuration options for tuning the driver.
#Section "Device"
# Identifier "Allwinner A10/A13 FBDEV"
# Driver "fbturbo"
# Option "fbdev" "/dev/fb0"
# Option "SwapbuffersWait" "true"
#EndSection
Section "Device"
Identifier "Raspberry Pi HDMI"
Driver "fbturbo"
Option "fbdev" "/dev/fb0"
Option "ShadowFB" "off"
EndSection
Section "Device"
Identifier "Raspberry Pi DPI"
Driver "fbturbo"
Option "fbdev" "/dev/fb1"
Option "ShadowFB" "off"
EndSection
Section "Monitor"
Identifier "HDMI"
EndSection
Section "Monitor"
Identifier "DPI"
EndSection
Section "Screen"
Identifier "screen0"
Device "Raspberry Pi HDMI"
Monitor "HDMI"
EndSection
Section "Screen"
Identifier "screen1"
Device "Raspberry Pi DPI"
Monitor "DPI"
EndSection
Section "ServerLayout"
Identifier "default"
Screen 0 "screen0" 0 0
Screen 1 "screen1" RightOf "screen0"
Option "Xinerama" "on"
EndSection
install freeRDP
sudo apt-get install freerdp2-x11
start freeRDP session
xfreerdp /v:<computer name or IP> /u:<user> /d:<domain> /sound:sys:alsa /multimon
or
xfreerdp /v:<computer name or IP> /u:<user> /d:<domain> /g:<gateway name or IP> /gu:<gateway user> /gd:<gateway domain> /sound:sys:alsa /multimon
audio interface is connected to gpio 18 & 19 (PWM)
see https://learn.adafruit.com/adding-basic-audio-ouput-to-raspberry-pi-zero/pi-zero-pwm-audio
/boot/config.txt
# Enable audio for PiZero(loads snd_bcm2835)
dtoverlay=pwm-2chan,pin=18,func=2,pin2=19,func2=2
dtparam=audio=on
For Pi4 or Pi400 use audremap overlay
/boot/config.txt
# Enable audio for PiZero(loads snd_bcm2835)
dtoverlay=audremap,pins_18_19
dtparam=audio=on
GPIO 9 , 10, 11 , 25, 26, 27 can be used as SPI , whit overlay spi0-cs, with CS redirection to gpio 26 & 27
/boot/config.txt
# uncomment to use spi0 with cs0 & cs1 retirected on pin 26 & 27
dtparam=spi=on
dtoverlay=spi0-cs,cs0_pin=26,cs1_pin=27
Copy vga565.dtbo to /boot/overlays/ and copy content of config-example.txt to /boot/config.txt
rev1
- bad vga footprint, hole too small
rev2
- change vga footprint
- move j3 & j5
rev3
- add GPIO25 to J4 connector
- add j6 DC 3.5x1.3 connector
- change to Kicad v5.0.2 lib
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