0. Environmental Science

Linux host OS:Ubuntu14.04 64 position , Running on the wmware workstation 10 virtual machine

Raspberry pie version :raspberry pi 2 B type .

Raspberry pie OS: From the official website raspbian-jessie.

Recommended in the root User login operation , Reference resources Set up root Sign in

1. Why cross compiling is needed

stay Ubuntu Directly compile a .c The source file can use the system's own gcc Compiler compilation test.c

gcc test.c -o test

Then execute the generated binaries

./test

Cross compiling is the process of compiling in LINUX PC( Or other hosts ) On the implementation , Then copy the binary executable to raspberry pie ( Or other platforms ) perform

I understand that cross compiling is mainly fast and convenient debug, If you compile one or two source files, maybe PC It's no different from raspberry pie , But if you compile the kernel, the speed gap is obvious .

On the compilation process reference :http://lxwei.github.io/posts/262.html

2. What kind of cross compiler tool to use

The cross compiler tool is chosen for the platform on which binary files are executed , There is a special cross compiler for raspberry pie :https://github.com/raspberrypi/tools, choice branch:master edition , On the right side clone or download, Click on download zip download .

It can also be installed directly online :

sudo apt-get install build-essential git
git clone git://github.com/raspberrypi/tools.git

3. Install cross compiler tool

3.1 decompression

The downloaded file is tools-master.zip, You can right-click extract decompression , It's fine too unzip Unzip to the new RPI Under the folder , -d Used to specify that the path is ./RPI

mkdir RPI
unzip -d ./RPI tools-master.zip

stay RPI Under the document tools/arm-bcm2708 There is... Under the folder 5 A folder ( Different versions may be slightly different ):

about 32 Bit Ubuntu, Use gcc-linaro-arm-linux-gnueabihf-raspbian, about 64 Use of bits gcc-linaro-arm-linux-gnueabihf-raspbian-x64. In the choice 64 Bit cross compiler tool .

3.2 Add environment variables

To use the cross compile tool, you need to add environment variables . The environment variable is simply to specify the path of the program , Make the program run directly on the terminal . Such as execution ls Instructions don't need to /bin/ls Because this path has been added to the environment variable PATH route . For environmental variables, please refer to Methods to modify environment variables

To view environment variables, you can use :

echo $PATH

Add cross compiler tools to environment variables , Can be directly in /etc/profile Add... At the end of the file ( You can also catalog it at home .bashrc, Refer to the following update )

#rpi cross compile path
export PATH=$PATH:$HOME/RPI/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin

Restart the environment variables to take effect immediately

3.3 test

Test for successful installation , Press google To the method in the terminal type

arm-linux-gnueabihf-gcc -v

An error is as follows ( If no error is reported, skip to the next step 4 Step )

After repeatedly confirming the environment variables PATH No problem , Found in gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin The next one is arm-linux-gnueabihf-gcc Text file for , The content is arm-linux-gnueabihf-gcc-4.8.3, And this file is executable . Maybe it's for the sake of version update compatibility that we do this kind of specified processing .

The terminal executes the following instructions

arm-linux-gnueabihf-gcc-4.8.3 -v

You can see that the installation is normal

4 Use cross compilation to generate executable files

For a single simple source file, you can directly call the cross compiler tool with instructions to generate binary files ; For complex multi-source files, you need to write makefile then make Instructions to compile

Compile from the command line here hellowd.c Generate an executable for raspberry pie hellowd

hellowd.c as follows

#include <stdio.h>
int main()
{
printf("hello,world linux\n");
}

Assign to hellowd.c route , And compile , The results are as follows ( If no error is reported, direct the second 5 Step )

According to the error information , View path /arm-linux-gnueabihf/libc/lib/arm-linux-gnueabihf/libc.so.6

It turns out that this is a text file , The content is libc-2.13.so Based on previous experience ,libc.so.6 It should be pointing to libc-2.13.so By default, the compiler uses libc.so.6 But it should be used libc-2.13.so , Only need to libc-2.13.so Rename it to libc.so.6 that will do ( Backup first libc.so.6 text file ).

Compile again as follows

Problem as above , Only need to modify ld-linux-armhf.so.3 Specified in the ld-2.13.so The name of the document is ld-linux-armhf.so.3 that will do

There is no error in recompiling

Under the source file path, you can see the generated executable file , Pay attention to the need for copy Go to raspberry pie

5. Executing executable files on raspberry pie

5.1 install filezilla

Due to conditions , Raspberry pie can't be connected to the Internet , Can't be used U disc , Only Ubuntu The host can access the Internet . I've tried it before Ubuntu Host installation vsftpd, Raspberry pie ftp host ip To transfer files , It turns out that the raspberry pie system is not installed ftp Instructions . End use filezilla Software implementation Ubuntu File transfer with raspberry pie .

I use it. .deb install , You need to manually install several dependency Libraries ,Ubuntu14.04 64 Bit filezilla Links are as follows https://pkgs.org/ubuntu-14.04/ubuntu-universe-amd64/filezilla_3.7.3-1ubuntu1_amd64.deb/download/

Conditions allow direct online installation , Please do it yourself google

see Ubuntu yes 32 A still 64 You can use the command

uname -a

If appear x86_64 yes amd64 position , appear i686( Other systems may i386) yes 32 position

my 64 position ubuntu as follows

5.2 copy hellowd Executable file

Raspberry pie and Ubuntu PC Connect to the switch through network cable respectively ( Or a router ), If the raspberry pie is connected with an external LCD screen, it can be operated directly in the raspberry pie , Otherwise, you can go through putty Software in PC Remote login raspberry pie operation , However putty You need to know about raspberry pie ip Address

If you use a router, you can check the address of the router on the browser for raspberry pie ip

Those with display screen can be viewed on the command line of raspberry pie ip

ifconfig

No screen to see ip Reference resources http://www.shumeipaiba.com/wanpai/jiaocheng/17.html

Raspberry pie and PC Direct reference http://www.shumeipaiba.com/wanpai/jiaocheng/20.html

Got the raspberry pie ip after , For example, mine is 192.168.2.46 It can be used filezilla Transfer files to raspberry pie

Host Raspberry pie ip: 192.168.2.46

Username: pi

Password:raspberry ( The default password )

Port:22

Click on Quickconnect Successful connection

Right click hellowd file ,add files to queue Add to transmission queue

Right click the transmission queue below process queue Processing queues , Complete the transmission . Refresh to see that the raspberry pie on the right already has hellowd file

5.3 perform hellowd

Raspberry pie external display can be directly cd To hellowd route , then ./hellowd perform

It can also be in PC through putty Log in to raspberry pie to execute

Default login pi password raspberry The password will not show , Enter directly after entering , Wrong input is OK backspace Delete

You need to change the authority to hellowd Can be executed by raspberry pie , The implementation is as follows

You can see that it's in line with the program's expectations , Cross compile successful

On the raspberry pie LCD screen, the terminal effect is as follows :

scrot It's a screenshot Software , You can take a screenshot on the raspberry pie , link :https://packages.debian.org/jessie/scrot

use uname -a Check out the raspberry pie structure for armhf, Install the appropriate version .

About scrot Use , Sure scrot --help see

------------------------------------------------------- Update the dividing line --------------------------------------------------------------------

Soon after I finished writing this article, I reloaded Ubuntu14.04 64 position , Reset cross compiler does not appear in this article cross compiler can not find the path and compile error and so on , But the previous mistakes are still worth recording and studying

Now my cross compiler tool is in the root directory ,root Log in to the home directory .bashrc Add cross compiler paths to environment variables

export PATH=$PATH:/RPI/tools-master/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin
arm-linux-gnueabihf-gcc -v

source After checking the version and cross compiling are normal , The path is written in /root/.bashrc /root/.profile /et/profile /etc/bash.bashrc There are no previous mistakes , Tested the addition of PATH The path is written as a variable $HOME/RPI Or the absolute path /RPI/  All normal .

It is recommended to put the tool in the root directory , Don't put it on HOME(/root) in , Modify the environment variables written in /root Of .bashrc in , Try to write absolute paths

reference

http://www.hertaville.com/development-environment-raspberry-pi-cross-compiler.html

http://blog.csdn.net/xukai871105/article/details/24932611

http://www.cnblogs.com/xieyajie/p/4699724.html

This article allows you to reprint , Please state the original address first http://www.cnblogs.com/cursorhu/p/5760415.html

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