meta-licheepizero

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meta-licheepizero

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Yocto meta-layer for LicheePi Zero module

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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](https://raw.githubusercontent.com/voloviq/meta-licheepizero/kirkstone/Lichee_Pi_Zero.png) 
Lichee Pi Zero Version 
 
![Schematic](https://raw.githubusercontent.com/voloviq/meta-licheepizero/kirkstone/Lichee_Pi_Zero_Dock.jpg) 
Lichee Pi Zero Dock Version

## General Note:
Assumed that Linux Ubuntu is installed

## List of tested elements

Ethernet 
Led 
Headphone

## List of not tested elements

WiFi 
Lcd 
Touchscreen(aligned driver for kernel 5.15) 
Backlight for Lcd 
Microphone 
Bluetooth - appears during system boot up

## 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 kirkstone*** 
 ***cd poky*** 
	***git clone git://git.openembedded.org/meta-openembedded --depth 1 -b kirkstone*** 
	***git clone https://github.com/meta-qt5/meta-qt5.git --depth 1 -b kirkstone*** 
	***git clone https://github.com/voloviq/meta-licheepizero --depth 1 -b kirkstone***

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-openembedded/meta-multimedia \\\
 ${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"* 
	*MACHINEOVERRIDES .= ":use-mailine-graphics"* 
	*LICENSE_FLAGS_ACCEPTED = "commercial"*

**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

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