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contacting you #1

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britxpatusa opened this issue Apr 26, 2022 · 15 comments
Open

contacting you #1

britxpatusa opened this issue Apr 26, 2022 · 15 comments

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@britxpatusa
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hello - im trying to get the VGA adapter working but having no luck on a P400 or Pi4.
can you help?
@llegoff
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llegoff commented Apr 27, 2022

Hello,
what OS are you trying to run the interface on?
Raspberry pi OS, Recalbox OS, RGBpi OS, ... ?
What screen are you using? what resolution?

Cordially
Laurent

@britxpatusa
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britxpatusa commented Apr 27, 2022 via email •
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@britxpatusa
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quick update on this:
sound is working through the adapter
HDMI is working
VGA still no signal

@llegoff
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llegoff commented Apr 27, 2022 •
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Overlay vc4-kms-dpi-generic work with vc4-kms-v3d (not with vc4-fkms-v3d)

modify


[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

by

[pi4]
 # Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-kms-v3d
max_framebuffers=2

erase 2 line

gpio=0-1=a2
gpio=2-8,12-17,20-24=a2

this is already configured by the overlay vc4-kms-dpi-generic

I'm not sure that the vc4-kms-dpi-generic overlay is up to date on CoinOPS

the vc4-vga666 overlay (https://github.com/Cpasjuste/rpi-dpidac) can also be used with the mode6 option
This overlay seems present on CoinOPS

dtoverlay=vc4-kms-v3d
dtoverlay=vc4-vga666,mode6

Overlay vc4-vga666 work with vc4-kms-v3d (not with vc4-fkms-v3d)

I don't know CoinOPS, I download it to test

@britxpatusa
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awesome ill give that a go thanks!

@llegoff
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llegoff commented Apr 27, 2022 •
edited
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I tested CoinOPS, but my gamepad does not work.
below are the 2 configs that work

configuration working with the vc4-kms-v3d overlay

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# Disable rainbow image at boot
disable_splash=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=16

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=2100
#v3d_freq=850
#over_voltage=7

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
display_auto_detect=1

# Enable DRM VC4 V3D driver
dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

[all]

[pi4]
# Run as fast as firmware / board allows
#arm_boost=1

[all]
enable_uart=1

# Enable audio on GPIO for Pi400
dtoverlay=audremap,pins_18_19
dtparam=audio=on

dtoverlay=vc4-kms-dpi-generic,rgb666-padhi
dtparam=hactive=320,hfp=4,hsync=30,hbp=46
dtparam=vactive=240,vfp=4,vsync=5,vbp=14
dtparam=clock-frequency=6400000
#   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
#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

I note that with the vc4-dpi-generic overlay does not manage interlaced resolution

configuration working with the vc4-fkms-v3d overlay

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# Disable rainbow image at boot
disable_splash=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=16

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=2100
#v3d_freq=850
#over_voltage=7

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
#dtparam=spi=on

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
display_auto_detect=1

# Enable DRM VC4 V3D driver
dtoverlay=vc4-fkms-v3d
max_framebuffers=2

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
otg_mode=1

[all]

[pi4]
# Run as fast as firmware / board allows
#arm_boost=1

[all]
enable_uart=1

# Enable audio on GPIO for Pi400
dtoverlay=audremap,pins_18_19
dtparam=audio=on

# DPI
# disable i2c, pin use by h-sync & v-sync
dtparam=i2c_arm=off
gpio=2-9,12-17,20-24=a2
dpi_output_format=0x6
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
#244p@60
hdmi_timings=320 1 4 30 46 240 1 4 5 14 0 0 0 60 0 6400000 1
#288p@50
#hdmi_timings=384 1 16 32 40 288 1 3 2 19 0 0 0 50 0 7363200 1
#576i@50
#hdmi_timings=768 1 24 72 88 576 1 6 5 38 0 0 0 50 1 14875000 1
#480i@60
#hdmi_timings=640 1 24 64 104 480 1 3 6 34 0 0 0 60 1 13054080 1
#480p@60
#hdmi_timings=640 1 24 96 48 480 1 11 2 32 0 0 0 60 0 25452000 1

vc4-vga666 overlay is not installed on CoinOPS

TV resolutions are better handled on RecalboxOS and RGB-Pi-OS

@britxpatusa
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ok i will try now! thanks for looking at this!

@britxpatusa
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ok we have a picture now but its correct - need to find resolution?
also lost sound from the VGA adapter?

@llegoff
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llegoff commented Apr 27, 2022

I don't have the sound either on CoinOPS, but I have it on RaspberrypiOS with the same config

I saw in a CoinOPS documentation that the sound is by default on hdmi

there is probably a menu to activate the sound on the jack, but I do not have a controller compatible with CoinOPS, I do not have access to the menu

@britxpatusa
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thanks i had the sound working through the adapter..the coinops build is HDMI only v3 will allow other...
Are there any other options in terms of hdmi timings i can try?
I have tried all of these by uncommenting each one(#)
Im using a VGA to RGB adpater to the CRT tv (NTSC) USA tv

@llegoff
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llegoff commented Apr 27, 2022

on the Recalbox wiki page there is a list of hdmi_timmings to test :
https://wiki.recalbox.com/en/tutorials/video/crt/crt-screen-dpi-vga666-piscart-rgbpi

pi400RGB works well with Recalbox:
https://wiki.recalbox.com/en/tutorials/video/crt/recalbox-on-crt-with-scart-dac

@britxpatusa
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britxpatusa commented Apr 27, 2022 via email

@llegoff
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llegoff commented Apr 28, 2022

There are 3 types of vga to RGB cables:

  • VGA -> 5 RCA or BNC ( R + G + B + Hsync + Vsync) this type of cable works
  • VGA -> 4 RCA or BNC ( R + G + B + Csync) this type of cable has a good chance of working
  • VGA -> 3 RCA or BNC ( R + G/Csync +B) this type of cable will only work if it contains components to combine the G+Hsync+Vsync signals on the same connector

@britxpatusa
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britxpatusa commented Apr 28, 2022 via email

@llegoff
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llegoff commented Apr 28, 2022

CT-27SL15 seems to have a YPbPr input, and cable is VGA to YPbPr, its good
this cable contains components to convert RGB (VGA) to YPbPr
Y=0,299R+0,587G+0,114B+Csync
Pb=-0,168R-0,331G+0,5B
pr=0,5R-0,418G-0,081*B

in europe we did not have YPbPr socket on CRT TVs, but a SCART socket with RGB input

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@llegoff @britxpatusa