Hello guys,
I’m making some tests with an rp3 and a Display 5” inch (800×480).
Everything works fine except for one peculiarity.
I have noticed that the calibration of the touchscreen I can not edit it in 99-calibration.conf, whether or not the file I tried to create it also and does not affect the calibration parameters that I introduce new.
I noticed that the display drivers modify my /boot/config.txt file and it is in this file that the “good” calibration parameters are supposed to be.
The problem basically is that when I touch the center of the screen the calibration works perfectly, the cursor is placed in the exact location. As I approach the edges of the screen, upper, lower and sides, the calibration is accumulating an error, and it is at the edge of the screen where I can’t touch or click anything.
Any ideas? I leave the config.txt to see if you see any parameter that is giving problems.
Sorry for my english, if you need information from some other file, ask me.
Thank you.
# For more options and information see
# http://rpf.io/configtxtreadme
# 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=2
hdmi_mode=87
# 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
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0
dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900