3.5inch lcd touchscreen issues

ryan spicer

Hey all, got a 3.5inch lcd touchscreen, works fine in raspbian, but when emulation station starts it switches to hdmi, tried everything to get it to work on the screen to no avail, can anyone help me please. Dont care about the touch screen part, just want to use to display the games

mitu

Please add more info about your system, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first, including what model is your LCD screen and how is it connected.
Did you have to install any driver in order to make the LCD work ?

ryan spicer

@mitu it's a 480x320 xpt2046 touch controller, downloaded drivers fine and works fine with raspbian, just diverts image to hdmi when emulation station loads, it's on a pi b+ - first model.

ryan spicer

@mitu it connects straight into the pi aswell.

mitu

RetroPie is based on Raspbian Lite, so if it works with that version of Raspbian, then it should work with RetroPie.
According to this post, you don't need to install a driver, just add a few lines to config.txt and this should be it.
You haven't given much information about your system, really - what version of RetroPie are you using ? How did you install it ?

ryan spicer

@mitu I have used multiple ways, iso, raspbian then added retropie, all end the same, I'm running 4.6 latest retropie iso currently, I've added the config text aswell, retropie isnt working unless thru hdmi, it shows the command lines not the gaming menu etc. Seems to have been a common issue as many have same issue but I see no fix.

mitu

Have you tried disabling the HDMI output or disconnecting the HDMI display ?

ryan spicer

@mitu is there a way to force it instead of switching to hdmi in config

ryan spicer

@mitu yep, doesnt change a thing, nor leaving hdmi off for whole process, loads fine then black screen

mitu

Try adding to your config.txt:

enable_dpi_lcd=1
display_default_lcd=1

If that doesn't work, then please post the config.txt file.

ryan spicer

@mitu I'll try that, cheers for your help.

ryan spicer

@ryan-spicer I loaded this and it worked finally, appreciate your help
https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(A)

mitu

Glad you got it working.
For future reference (just in case someone has the same problem), can you post your config.txt file ?

ryan spicer

@mitu not working properly :( will load config soon

ryan spicer

@ryan-spicer seems to work but doesnt load all the title screen headers etc properly, in saying that it does play the games I've tried, not perfect but close :)

# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# 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

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=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=1

# 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=800

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
enable_uart=1
# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

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

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
dtoverlay=waveshare35a
#dtoverlay=ads7846,cs=1,penirq=17,penirq_pull=2,speed=1000000,keep_vref_on=1,swapxy=1,pmax=255,xohms=60,xmin=200,xmax=3900,ymin=200,ymax=3900
hdmi_force_hotplug=1
#max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 640 480 60 6 0 0 0
hdmi_drive=2

ryan spicer

@ryan-spicer changed the theme to a more basic theme - carbon, and its working great, stoked