recalbox not work well with DPI LCD on 4B

[ian57]

@DRAgon734235 this screen has 480x640 resolution so you need to rotate it (90 or 270). Actually it seems not to be supported in frambuffer, only with xrandr in GUI. I saw this https://www.raspberrypi.org/documentation/configuration/cmdline-txt.md and tried it but it only works with 0-180° not with 90-270.

[DRAgon734235]

@ian57

I do not rotate the LCD with 90 or 270, the LCD display as the default direction like this image

and the recalbox stay at this picture always

[ian57]

@DRAgon734235 I think you need to use the fdmk overlay instead of the dmks overlay : here is may configuration for my 800x480 dpi screen

temp_soft_limit=70
dtoverlay=vc4-fkms-v3d
 
 
# custom config
[all]
#3.5 HD tft screen 800x480
dtoverlay=dpi18
disable_overscan=1
 
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
 
hdmi_force_hotplug=1
 
 
#geekwrom
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

[DRAgon734235]

@ian57
I use recalbox-rpi4 7.1

this is my code ：

dtoverlay=vc4-fkms-v3d
max_framebuffers=1
overscan_scale=1

overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0

hdmi_force_hotplug=1

framebuffer_width=480
framebuffer_height=800

gpio=0-9=a2
gpio=12-17=a2
gpio=20-25=a2
dtoverlay=dpi18
enable_dpi_lcd=1
display_default_lcd=1
#extra_transpose_buffer=2
dpi_group=2
dpi_mode=87
dpi_output_format=0x7F216
hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1
dtoverlay=waveshare-28dpi-3b-4b

The recalbox still stay at that recalbox logo picture always

[DRAgon734235]

@ian57

Your recalbox is 4.6 ？

[ian57]

@DRAgon734235 nop, 7.2 beta do you have something connected on HDMI?

[DRAgon734235]

@ian57
I have tried to connect or not connect HDMI LCD , the HDMI LCD not display

they do not have any effect

[ian57]

@DRAgon734235 here is my complete config.txt :

############################################################################
# Boot loader configuration                                                #
# Warning: do not edit this file as it will be overwritten when upgrading! #
############################################################################

# Using /etc/modules is deprecated and no longer supported on 4.4 kernel
# So manually enable audio
dtparam=audio=on

# if you plug your tv at the same time as your rpi and that the rpi switches from the hdmi or
# give a low resolution because tv had no enough time to initialize it
boot_delay=3

# disable boot rainbow
disable_splash=1

# default CEC name
cec_osd_name=recalbox

avoid_safe_mode=1

kernel=boot/linux
initramfs boot/initrd.gz

# force hdmi while the tv can take time before sending the signal on the hdmi output
hdmi_force_hotplug=1

# total amount of GPU memory
gpu_mem_256=128
gpu_mem_512=256
gpu_mem_1024=448

# your settings can be set in /boot/recalbox-user-config.txt
include recalbox-user-config.txt
# Raise the first security limit up to 70° instead of 60° for pi3 and pi4
[pi3]
temp_soft_limit=70

[pi4]
temp_soft_limit=70
dtoverlay=vc4-fkms-v3d
#max_framebuffer=2


# custom config
[all]
#3.5 HD tft screen 800x480
dtoverlay=dpi18
                            
#geekwrom DPI 480x800 TFT display
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

[DRAgon734235]

@ian57

thank you

where can I download recalbox 7.2 beta ？

I will try that

[ian57]

@DRAgon734235 sorry you cannot it's development only actually
I think it will be soon released.I get this

[DRAgon734235]

@ian57
OK ， I will test when recalbox 7.2 beta come .

it is possible to rotate the DPI or HDMI LCD with 90 or 270 at recalbox 4B？

[ian57]

@DRAgon734235 no not yep... even with new 5.10 kernels

did you see this https://www.waveshare.com/wiki/2.8inch_DPI_LCD there are specific overlays for this screen https://www.waveshare.com/wiki/File:28DPIB_DTBO.zip

I think you should copy them in the /boot/overlays directory and use the config from the wiki :

gpio=0-9=a2
gpio=12-17=a2
gpio=20-25=a2
dtoverlay=dpi24
enable_dpi_lcd=1
display_default_lcd=1
extra_transpose_buffer=2
dpi_group=2
dpi_mode=87
dpi_output_format=0x7F216
hdmi_timings=480 0 26 16 10 640 0 25 10 15 0 0 0 60 0 32000000 1
#dtoverlay=waveshare-28dpi-3b-4b
#dtoverlay=waveshare-28dpi-3b
dtoverlay=waveshare-28dpi-4b

[DRAgon734235]

@ian57

yes ， I use that dtbo file from waveshare

I have tried that code ， same

The LCD can display OK ， but recalbox os can not enter Emulator

I think this is recalbox bug at DPI LCD，

[ian57]

@DRAgon734235 in the code you post, you use dpi18 and not dpi24 which is the right one

which one are you using?

[DRAgon734235]

@ian57

I have tried dpi18 and dpi24

they are same result

[ian57]

@DRAgon734235 quite strange... works well here...
perhaps it comes from the 7.2 beta ... so wait and see

[DRAgon734235]

@ian57
it is possible to rotate the DPI or HDMI LCD with 90 or 270 at recalbox 4B？

[ian57]

@DRAgon734235 actually with recalbox, no, sorry

[DRAgon734235]

@ian57

[ian57]

@DRAgon734235 Yes I know !