Seting paparan HDMI

Untuk projek ini, kita perlu mempunyai perpustakaan ddcutil untuk mempunyai akses kepada tetapan paparan HDMI melalui I2C.

Untuk memasukkan pustaka ddcutil ke dalam sistem linux tersuai anda, anda perlu mencipta resipi tersuai untuknya.

resipi ddcutil_git.bb

Dalam lapisan meta tersuai anda mencipta folder 'resipi-sokongan/ddcutil'. Dan dalam folder ini, buat fail '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

Masukkan ddcutil ke dalam imej anda

Anda mesti memasukkan resipi dalam Yocto Linux anda:

IMAGE_INSTALL:append = " ddcutil"

Kemudian anda boleh menggigit imej anda dan menguji hasilnya.</:code22:></:code11:>

Log masuk ke sistem terbenam tersuai anda atau sambung melalui SSH.

Sekarang anda boleh menggunakan arahan ddcutil dan melihat sama ada pelaksanaannya berjaya.

Monitor laporan dikesan

Pertama sekali, anda boleh mengesan sama ada monitor HDMI disambungkan dan boleh didapati melalui ddcutil. Gunakan perintah berikut:

ddcutil detect

Output sepatutnya kelihatan seperti ini:

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

Dapatkan semua tetapan

Untuk mendapatkan semua seting, gunakan perintah berikut:

ddcutil getvcp all

Output sepatutnya kelihatan seperti ini:

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

Tetapkan kecerahan

Untuk mengesetkan kecerahan monitor kepada 50%, gunakan arahan berikut:

ddcutil setvcp 10 50

Hakcipta Terpelihara © 2022 Interelectronix e.K.
Kod sumber Projek ini dilesenkan di bawah lesen GPL-3.0.