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meta-licheepizero

Instruction how to build an image for Lichee Pi Zero and Lichee Pi Zero Dock in Yocto

Products:

Schematic
Lichee Pi Zero Version

Schematic
Lichee Pi Zero Dock Version

General Note:

Assumed that Linux Ubuntu is installed

List of tested elements

WiFi
Ethernet
Lcd
Touchscreen
Led
Backlight for Lcd

List of not tested elements

Bluetooth - appears during system boot up
Microphone
Headphone

How to build an images

  1. First make sure to following packages are installed in system

    sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib build-essential chrpath socat libsdl1.2-dev xterm libmpc-dev libgmp3-dev

    Note: More informations can be found on Yocto reference manual.

  2. Download necessary Yocto packaged listed below. Be sure to be in root of home folder.

    mkdir yocto
    cd yocto
    mkdir build
    git clone git://git.yoctoproject.org/poky --depth 1 -b dunfell
    cd poky
    git clone git://git.openembedded.org/meta-openembedded --depth 1 -b dunfell
    git clone https://github.com/meta-qt5/meta-qt5.git --depth 1 -b dunfell
    git clone https://github.com/voloviq/meta-licheepizero --depth 1 -b dunfell

  3. Select directory to build Linux

    Zero version
    source oe-init-build-env ~/yocto/build/licheepizero
    Zero Dock version
    source oe-init-build-env ~/yocto/build/licheepizero-dock

  4. Modify bblayers.conf(located in ~/yocto/build/licheepizero/conf(or licheepizero-dock/conf))

    BBLAYERS ?= " \
    ${HOME}/yocto/poky/meta \
    ${HOME}/yocto/poky/meta-poky \
    ${HOME}/yocto/poky/meta-openembedded/meta-oe \
    ${HOME}/yocto/poky/meta-openembedded/meta-networking \
    ${HOME}/yocto/poky/meta-openembedded/meta-python \
    ${HOME}/yocto/poky/meta-qt5 \
    ${HOME}/yocto/poky/meta-licheepizero \
    "

    Note: Please adapt PATH of conf/bblayers.conf if necessary.

  5. Modify local.conf(located in ~/yocto/build/licheepizero/conf(or licheepizero-dock/conf)) file

    • modify line with "MACHINE ??" to add "licheepizero-dock" or "licheepizero"

    • align DL_DIR = "${HOME}/yocto/downloads"

    • align SSTATE_DIR = "${HOME}/yocto/sstate-cache"

    • align TMPDIR = "${HOME}/yocto/tmp"

    • add at the end following records

      RM_OLD_IMAGE = "1"
      INHERIT += "rm_work"

    Note: Please adapt rest of conf/local.conf parameters if necessary.

  6. Build objects

    • console image
      bitbake console-image

    • qt5 image
      bitbake qt5-image

    • qt5 toolchain sdk
      bitbake meta-toolchain-qt5

  7. After compilation images appears in

    Zero version
    ~/yocto/tmp/deploy/images/licheepizero
    Zero Dock version
    ~/yocto/tmp/deploy/images/licheepizero-dock

  8. Insert SD CARD into dedicated CARD slot and issue following command to write an image

    Note:
    Be 100% sure to provide a valid device name (of=/dev/sde). Wrong name "/dev/sde" dameage Your system file !

    Zero version
    sudo dd if=~/yocto/tmp/deploy/images/licheepizero/qt5-image-licheepizero.sunxi-sdimg of=/dev/sde bs=1024
    Zero Dock verison
    sudo dd if=~/yocto/tmp/deploy/images/licheepizero-dock/qt5-image-licheepizero-dock.sunxi-sdimg of=/dev/sde bs=1024

Audio

To play mp3 or ogg files type
mpv ogg-file-name.ogg
mpv mp3-file-name.mp3
cvlc mp3-file-name.mp3
To change volume
amixer set Headphone 10%+
amixer set Headphone 10%-
or just
amixer set Headphone 10%

Amixer available options
amixer scontrols

Microphone on
amixer -c 0 cset numid=12 2

Record some voice from microphone
arecord -D hw:0,0 -d 3 -f S16_LE -r 16000 tmp.wav

To get sound device info
ls /dev/snd


# Limitation 
- sunxi_mali is probably not working
- rootfs-resize not working (SD CARD size can be resized manualy)
- no wiringpi or similar library to driver GPIO in C code
- discover problem when WiFi connected to access point (probably some drivers issues), nevertheless WiFi works