meta-licheepizero

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

Products:

Lichee Pi Zero Version


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