HDMI-displayindstillinger

For dette projekt skal vi sørge for at ddcutil-biblioteket har adgang til HDMI-displayindstillinger via I2C.

For at inkludere ddcutil biblioteket i dit brugerdefinerede linux-system, skal du oprette en brugerdefineret opskrift til det.

####ddcutil_git.bb opskrift

I dit brugerdefinerede metalag skal du oprette en mappe 'recipes-support/ddcutil'. Og i denne mappe skal du oprette en fil 'ddcutil_git.bb'.

SUMMARY = "Tool to modify display settings by ddc (hdmi)"
HOMEPAGE = "http://www.ddcutil.com"
AUTHOR = "Sanford Rockowitz  "
LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263"

BRANCH = "master"

SRCREV = "5080161b456cc6a1fd3e6db3dc537e1dcd1c809b"

PV = "1.2.2+${SRCPV}"

SRC_URI = " \
    git://github.com/rockowitz/ddcutil;branch=${BRANCH};protocol=https; \
    "

# disable trying to fetch from mirrors
PREMIRRORS = ""
MIRRORS = ""

DEPENDS += "\
    i2c-tools \
    libusb1 \
    libdrm \
    libgudev \
    "

RDEPENDS_${PN} += "\
    i2c-tools \
    i2c-tools-misc \
    libdrm \
    "

S = "${WORKDIR}/git"

EXTRA_OECONF += "\
    --disable-x11 --enable-drm --disable-usb --enable-lib --disable-doxygen \
    "

inherit autotools pkgconfig

Medtag ddcutil i dit billede

Du skal inkludere opskriften i din Yocto Linux:

IMAGE_INSTALL:append = " ddcutil"

Derefter kan du bitbake dit billede og teste resultatet.

Log ind på dit brugerdefinerede indlejrede system, eller opret forbindelse via SSH.

Nu kan du bruge kommandoen ddcutil og se, om implementeringen lykkedes.

Rapportskærme detekteret

Først og fremmest kan du registrere, om en HDMI-skærm er tilsluttet og tilgængelig via ddcutil. Brug følgende kommando:

ddcutil detect

Outputtet skal se sådan ud:

Display 1
   I2C bus:  /dev/i2c-3
   EDID synopsis:
      Mfg id:               IVM
      Model:                PLT2236
      Product code:         22057
      Serial number:        11402A7100051
      Binary serial number: 51 (0x00000033)
      Manufacture year:     2017,  Week: 1
   VCP version:         2.1

Få alle indstillinger

For at få alle indstillinger, skal du bruge følgende kommando:

ddcutil getvcp all

Outputtet skal se sådan ud:

VCP code 0x02 (New control value             ): No user controls are present (0xff)
VCP code 0x0b (Color temperature increment   ): 50 degree(s) Kelvin
VCP code 0x0c (Color temperature request     ): 3000 + 70 * (feature 0B color temp increment) degree(s) Kelvin
VCP code 0x10 (Brightness                    ): current value =   100, max value =   100
VCP code 0x12 (Contrast                      ): current value =    50, max value =   100
VCP code 0x14 (Select color preset           ): User 1 (sl=0x0b)
VCP code 0x16 (Video gain: Red               ): current value =   100, max value =   100
VCP code 0x18 (Video gain: Green             ): current value =   100, max value =   100
VCP code 0x1a (Video gain: Blue              ): current value =   100, max value =   100
VCP code 0x52 (Active control                ): Value: 0x00
VCP code 0x60 (Input Source                  ): DVI-1 (sl=0x03)
VCP code 0x62 (Audio speaker volume          ): current value =    49, max value =   100
VCP code 0x6c (Video black level: Red        ): current value =    50, max value =   100
VCP code 0x6e (Video black level: Green      ): current value =    50, max value =   100
VCP code 0x70 (Video black level: Blue       ): current value =    50, max value =   100
VCP code 0x8d (Audio Mute                    ): Unmute the audio (sl=0x02)
VCP code 0xac (Horizontal frequency          ): 1964 hz
VCP code 0xae (Vertical frequency            ): 60.00 hz
VCP code 0xb2 (Flat panel sub-pixel layout   ): Red/Green/Blue vertical stripe (sl=0x01)
VCP code 0xb6 (Display technology type       ): LCD (active matrix) (sl=0x03)
VCP code 0xc0 (Display usage time            ): Usage time (hours) = 1030 (0x000406) mh=0xff, ml=0xff, sh=0x04, sl=0x06
VCP code 0xc6 (Application enable key        ): 0x006f
VCP code 0xc8 (Display controller type       ): Mfg: Novatek (sl=0x12), controller number: mh=0xff, ml=0xff, sh=0x00
VCP code 0xc9 (Display firmware level        ): 0.2
VCP code 0xca (OSD                           ): OSD Enabled (sl=0x02)
VCP code 0xcc (OSD Language                  ): English (sl=0x02)
VCP code 0xd6 (Power mode                    ): DPM: On,  DPMS: Off (sl=0x01)
VCP code 0xdc (Display Mode                  ): User defined (sl=0x04)
VCP code 0xdf (VCP Version                   ): 2.1

Indstil lysstyrke

Brug følgende kommando til at indstille skærmens lysstyrke til 50 %:

ddcutil setvcp 10 50

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Denne projektkildekode er licenseret under GPL-3.0-licensen.