USB and SATA

USB Speeds:

• USB 3.0 or SuperSpeed (5Gbps)
• USB 2.0 or Hi-Speed (480Mbps)
• USB 1.0 or Full-Speed (12Mbps)

 

SATA Speeds:

• SATA I (1.5Gbps)
• SATAII (3Gbps)
• SATA III (6Gbps)

 

android chrome debugging

to use remote debug first active developer mode in android

1-in android>setting>search bulid number-->then click on it several times to activate developer mode

2- android>setting>developer options>enable usb debugging

3- connect to computer with usb cable

4-in chrome pc type chrome://inspect > enter

5- in mobile open url then monitor in pc chrome://inspect/#devices

git remove remote origin

To remove remote use this:

git remote remove origin

Create and add repository in github

 create a new repository on the command line

echo "# python-exec" >> README.md
git init
git add README.md
git commit -m "first commit"
git branch -M main
git remote add origin https://github.com/hdeldar/python-exec.git
git push -u origin main

or push an existing repository from the command line

git remote add origin https://github.com/hdeldar/python-exec.git
git branch -M main
git push -u origin main

Creating a new repository in git

Creating a new repository on the command line:

touch README.md

git init

#git checkout -b main

git add README.md

git commit -m "first commit"

git remote add origin http://user:[e-mail]

git push -u origin master

#git push -u origin main


Pushing an existing repository from the command line:

git remote add origin http://user:[e-mail]

git push -u origin master

#git push -u origin main

Other:

git push --all origin

Guest Additions

نصب صحیح Guest Additions  روی  virtual box نیاز به اجرا دستور زیر در ابتدا دارد:

 

sudo apt-get install make gcc linux-headers-$(uname -r)

Zero port Qt5.4.1

Introduction to each part of Zero

Zero port Qt5.4.1

---

surroundings:

---

installation steps:

This article mainly describes the porting process of QT. For the porting process of tslib, you can search for the reference of "The whole process of tslib1.4 porting". If you don't need a touch screen,
you don't need to port tslib.

---

1. Preparation

Make sure the following software is installed,

sudo apt-get install xorg-dev libfontconfig1-dev \
libfreetype6-dev libx11-dev libxcursor-dev libxext-dev \
libxfixes-dev libxft-dev libxi-dev libxrandr-dev libxrender-dev

---

2. Configuration

1. Unzip the source code qt-everywhere-opensource-src-5.4.1.tar.gz, and enter the source code folder

tar xzf qt-everywhere-opensource-src-5.4.1.tar.gz
cd qt-everywhere-opensource-src-5.4.1/

2. Specify the arm architecture and cross compiler of the platform used:

vi qtbase/mkspecs/linux-arm-gnueabi-g++/qmake.conf

Change it to the following, you should actually need to make corresponding changes according to your own development environment:

#
# qmake configuration for building with arm-linux-gnueabi-g++
#

MAKEFILE_GENERATOR = UNIX
CONFIG += incremental
QMAKE_INCREMENTAL_STYLE = sublib
QT_QPA_DEFAULT_PLATFORM = linuxfb
QMAKE_CFLAGS_RELEASE += -O2 -march=armv7-a
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv7-a
include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)
QMAKE_INCDIR += /usr/local/tslib/include
QMAKE_LIBDIR += /usr/local/tslib/lib

implementmodifications to g++.conf

QMAKE_CC = arm-linux-gnueabihf-gcc -lts
QMAKE_CXX = arm-linux-gnueabihf-g++ -lts
QMAKE_LINK = arm-linux-gnueabihf-g++ -lts
QMAKE_LINK_SHLIB = arm-linux-gnueabihf-g++ -lts

implementmodifications to linux.conf

QMAKE_AR = arm-linux-gnueabihf-ar cqs
QMAKE_OBJCOPY = arm-linux-gnueabihf-objcopy
QMAKE_NM = arm-linux-gnueabihf-nm -P
QMAKE_STRIP = arm-linux-gnueabihf-strip
load(qt_config)

3. Configure Qt according to your actual needs (here is the compilation using tslib):

./configure \
-prefix /usr/local/qt5.4.1 \
-confirm-license \
-opensource \
-release \
-make libs \
-xplatform linux-arm-gnueabi-g++ \
-optimized-qmake \
-pch \
-qt-sql-sqlite \
-qt-libjpeg \
-qt-libpng \
-qt-zlib \
-tslib \
-no-opengl \
-no-sse2 \
-no-openssl \
-no-nis \
-no-cups \
-no-glib \
-no-dbus \
-no-xcb \
-no-xcursor -no-xfixes -no-xrandr -no-xrender \
-no-separate-debug-info \
-make examples -nomake tools -nomake tests -no-iconv

---

3. Compile and install

sudo make && make install

---

Fourth, transplant Qt to licheepi development board

After completing the above steps, qt5.4.1 will be installed into /usr/local/qt5.4.1. Then copy qt5.4.1 in /usr/local/ to the
/opt/ directory of the development board, and copy tslib in /usr/local/ to /usr/local/ of the development board.

---

Five, set the development board Qt environment variables:

vi /etc/bash.bashrc

Add the following:

export TSLIB_CONSOLEDEVICE=none
export TSLIB_FBDEVICE=/dev/fb0
export TSLIB_TSDEVICE=/dev/input/event1
export TSLIB_CONFFILE=/usr/local/tslib/etc/ts.conf
export TSLIB_PLUGINDIR=/usr/local/tslib/lib/ts
export TSLIB_CALIBFILE=/etc/pointercal
export LD_LIBRARY_PATH=/lib:/usr/lib:/usr/local/tslib/lib:/opt/qt5.4.1/lib
export PATH=/bin:/sbin:/usr/bin/:/usr/sbin:/usr/local/tslib/bin
export QT_QPA_PLATFORM_PLUGIN_PATH=/opt/qt5.4.1/plugins
export QT_QPA_PLATFORM=linuxfb:tty=/dev/fb0
export QT_QPA_FONTDIR=/opt/qt5.4.1/lib/fonts
export QT_QPA_GENERIC_PLUGINS=tslib:$TSLIB_TSDEVICE

After saving and exiting, make the above environment variables take effect:

source /etc/bash.bashrc

---

6. Run some examples:

/opt/qt5.4.1/examples/touch/pinchzoom/pinchzoom
/opt/qt5.4.1/examples/svg/embedded/fluidlauncher/fluidlauncher

---

We can see that QT running in linuxfb mode has no frame border, which is a feature of qt5, which seems to be better transferred to
mobile terminals such as mobile phones.
When testing the program, it may prompt that some library files do not exist. You can copy the corresponding library files under the cross compiler in the ubuntu host to the licheepi
development board, and then add environment variables to make it effective. Copy it if you don't know.

Previous: Zero Ethernet User Guide

Create and Execute First BASH Program

Open any editor to create a bash file. Here, nano editor is used to create the file and filename is set as ‘First.sh’

$ nano First.sh

Add the following bash script to the file and save the file.

#!/bin/bash

echo "Hello World"

 

$ bash First.sh

Or,

$ chmod a+x First.sh

$ ./First.sh

compile the file hello_world with gcc

For programs with a single source file, using gcc is simple.

/* File name is hello_world.c */
#include <stdio.h>

int main(void)
{
    int i;
    printf("Hello world!\n");
}

To compile the file hello_world.c from the command line:

gcc hello_world.c

gcc will then compile program and output the executable to the file a.out. If you want to name the executable, use the -o option.

gcc hello_world.c -o hello_world

The executable will then be named hello_world instead of a.out. By default, there are not that many warnings that are emitted by gcc. gcc has many warning options and it is a good idea to look through the gcc documentation to learn what is available. Using '-Wall' is a good starting point and covers many common problems.

gcc -Wall hello_world.c -o hello_world

compile libpng library

Install well zlib Behind the library , Proceed again libpng The installation of the library .

cd libpng-1.6.37
export LDFLAGS="-L/home/book/mytest/zlib-1.2.11"
export CPPFLAGS="-L/home/book/mytest/zlib-1.2.11"
./configure --host=arm-linux-gnueabihf --prefix=$PWD/tmp
makesudo make install