Testing OLDI and touchscreen interfaces

Prereqs

Lincoln Technology Solutions LCD185-101CT 10.1" TFT display

Assembly instructions:

Line up the adapter board such that touch screen cable fits just right
Tape up the adapter board to panel
Connect touch screen cable, panel cable and two backlight cables and the the cable towards beagle
Connect usb type C power as well
Power up sequencing requirement: Power up panel before powering up board.

Enabling the panel:

Edit the file /boot/firmware/extlinux/extlinux.conf and add the following line just after fdtdir

 fdtoverlays /overlays/k3-am625-lc-lt-lcd185.dtbo

Example for emmc boot:

label Linux eMMC
    kernel /Image
    append quiet quiet quiet console=ttyS2,115200n8 earlycon=ns16550a,mmio32,0x02800000 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait net.ifnames=0 quiet
    fdtdir /
    fdtoverlays /overlays/k3-am625-lc-lt-lcd185.dtbo
    initrd /initrd.img

Testing backlight

cd /sys/devices/platform/backlight/backlight/backlight

switch on backlight in various intensities

for i in $(seq 0 7); do echo -n "$i"|sudo tee brightness; sleep 2; done

Testing touchscreen

Note: R243 needs to be removed before Touch Functionality is Enabled on DVT and EVT. TBD: Resistor Changes on Display Controller side may also be needed

# evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0:	tps65219-pwrbutton
/dev/input/event1:	gpio-keys
/dev/input/event2:	Goodix Capacitive TouchScreen
/dev/input/event3:	Logitech USB Keyboard
/dev/input/event4:	Logitech USB Keyboard Consumer Control
/dev/input/event5:	Logitech USB Keyboard System Control
/dev/input/event6:	Logitech USB Optical Mouse
Select the device event number [0-6]: 2
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x416 product 0x3a0 version 0x1040
Input device name: "Goodix Capacitive TouchScreen"
Supported events:
  Event type 0 (EV_SYN)
  Event type 1 (EV_KEY)
    Event code 59 (KEY_F1)
    Event code 60 (KEY_F2)
    Event code 61 (KEY_F3)
    Event code 62 (KEY_F4)
    Event code 63 (KEY_F5)
    Event code 64 (KEY_F6)
    Event code 125 (KEY_LEFTMETA)
    Event code 330 (BTN_TOUCH)
  Event type 3 (EV_ABS)
    Event code 0 (ABS_X)
      Value      0
      Min        0
      Max     1919
    Event code 1 (ABS_Y)
      Value      0
      Min        0
      Max     1199
    Event code 47 (ABS_MT_SLOT)
      Value      0
      Min        0
      Max        9
    Event code 48 (ABS_MT_TOUCH_MAJOR)
      Value      0
      Min        0
      Max      255
    Event code 50 (ABS_MT_WIDTH_MAJOR)
      Value      0
      Min        0
      Max      255
    Event code 53 (ABS_MT_POSITION_X)
      Value      0
      Min        0
      Max     1919
    Event code 54 (ABS_MT_POSITION_Y)
      Value      0
      Min        0
      Max     1199
    Event code 57 (ABS_MT_TRACKING_ID)
      Value      0
      Min        0
      Max    65535
Properties:
  Property type 1 (INPUT_PROP_DIRECT)
Testing ... (interrupt to exit)

Testing Display

Display panel should come up - See instructions similar to Testing HDMI for additional command instructions.

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