Difference between revisions of "Python development"

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==Installation==
 
==Installation==
−
Python interpreter and libraries are not installed in the default rootfs. Currently it increases the rootfs size by 6 MBytes and so, without cleanup, '''it won't fit in the Armadeus standard Flash size (8 MBytes)'''.<br>
+
* Python interpreter and libraries are not installed in the default APF rootfs:
−
So for the moment, you can only use it from a NFS or a MMC/SD rootfs.
+
** Currently it increases the rootfs size by 6 MBytes and so, without cleanup, '''it won't fit in the old APF9328 boards with 8 MBytes FLASH size'''. So for the moment, if you have an 8MB FLASH, you can only use it from a [[Network_Configuration#Boot_from_NFS | NFS]] or [[MultiMediaCard#Booting_from_MMC.2FSD | a MMC/SD rootfs]]. If your are a Python expert you can still delete some files in $ARMADEUS_ROOTFS/usr/lib/python2.7/... and tell us what isn't mandatory and uses a lot of space for nothing.
−
If your are a Python expert you can still delete some files in $ROOTFS/usr/lib/python2.4/... and tell us what isn't mandatory and use a lot of space for nothing.
+
** On the APF27/51/28/6, you can activate it without concerning about the FLASH size.
 +
* Python version available in latest Buildroot is '''2.7'''.
  
 
* Launch Buildroot's menuconfig:
 
* Launch Buildroot's menuconfig:
−
armadeus $ make menuconfig
+
<pre class="host">
−
* In
+
$ make menuconfig
−
[[Image:Menuconfig_package.png]] <br> choose <br> [[Image:Menuconfig_package_python.png]] <br>
+
</pre>
−
* then save your configuration and build your system:
+
<pre class="config">
−
$ make
+
Target packages  --->
−
* copy generated rootfs to your NFS directory or on your MMC/SD. If you already have an existing rootfs then just make a:
+
    Interpreter languages and scripting  --->
−
armadeus $ cp -r buildroot/build_arm_nofpu/root/usr/ /local/export/
+
        [*] python
−
Here ''/local/export/'' is my NFS directory.
+
            python module format to install (.pyc compiled sources only)  --->
 +
            core python modules  --->
 +
            external python modules  --->
 +
</pre>
 +
 
 +
* then save your configuration and rebuild your system:
 +
<pre class="host">
 +
$ make
 +
</pre>
 +
* reflash you rootfs or, if needed, copy it to your NFS directory or on your MMC/SD: [[Network_Configuration#Boot_from_NFS | Booting from NFS]] or [[MultiMediaCard#Booting_from_MMC.2FSD | Booting from MMC/SD]].
  
 
==Source code==
 
==Source code==
−
First take your favorite editor/IDE and create the following script:
+
* First take your favorite editor/IDE and create the following script:
  
−
import sys
+
<source lang=python>
 +
import sys
 
   
 
   
−
print "APF9328 says: Hello World ! ;-)"
+
    print "APF says: Hello World ! ;-)"
−
system.exit(0)
+
    sys.exit(0)
 +
</source>
 +
* Save it as hello.py
  
−
Save it as hello.py
+
===Compilation===
−
 
+
−
==Compilation==
+
 
Not needed. Transforming python script in executables hasn't been tested yet.
 
Not needed. Transforming python script in executables hasn't been tested yet.
  
 
==Running==
 
==Running==
−
* Copy your ''hello.py'' script on your NFS export directory or on your MMC/SD
+
* Copy your ''hello.py'' script on your target through TFTP or NFS export dir or your MMC/SD
 
* then on your APF console, launch it:
 
* then on your APF console, launch it:
 +
<pre class=apf>
 
  # python hello.py
 
  # python hello.py
−
  APF9328 says: Hello World ! ;-)
+
  APF says: Hello World ! ;-)
 
  #
 
  #
 +
</pre>
  
−
Now it's up to you ! ;-) But keep in mind that Python is extremly powerfull and libraries rich, so if you don't pay attention to memory usage of your scripts, you can easily reach the APF9328 memory size limit: 16 MBytes.
+
Now it's up to you !! But keep in mind that Python is extremely powerful and libraries rich, so if you don't pay attention to memory usage of your scripts, you can easily reach the APF9328 RAM size limit: 16 MBytes. On the APF27/51/28/6, it will be much more difficult ;-).
 +
 
 +
== Advanced usages ==
 +
=== Disabling modules ===
 +
 
 +
Defaults python modules can be enabled/disabled by Buildroot menuconfig.
 +
 
 +
=== Installing modules ===
 +
 
 +
Default Python installation on Buildroot is "minimal"; for certain usage, it's necessary to install more modules. Here a list of modules tested on the APF9328 :
 +
 
 +
====pyserial====
 +
This module is used to communicate through serial port (RS232). The package is really simple to install:
 +
<pre class="host">
 +
$ make menuconfig
 +
</pre>
 +
<pre class="config">
 +
Target packages  --->
 +
    Interpreter languages and scripting  --->
 +
        [*] python
 +
            ...
 +
            external python modules  --->
 +
                ...
 +
                [*] python-serial
 +
</pre>
 +
 
 +
===GUI===
 +
* To develop Graphical User Interface with Python you have the choice:
 +
** text like ones: curses, [http://urwid.org/index.html urwid], [http://www.npcole.com/npyscreen/ npyscreen]
 +
** basic graphical one: [[Pygame]], [[TkInter]]
 +
** advanced graphical ones: [[PySide]] (Qt), [[WxPython]]
  
 
==Links==
 
==Links==
 
* [http://www.python.org/doc/ Python documentation]
 
* [http://www.python.org/doc/ Python documentation]
 +
* [https://wiki.python.org/moin/GuiProgramming GUI in Python]
 
* [[Network_Configuration | NFS server installation]]
 
* [[Network_Configuration | NFS server installation]]
 
* [[MMC/SD | Connect a MMC/SD card to your APF board]]
 
* [[MMC/SD | Connect a MMC/SD card to your APF board]]
 +
 +
[[Category:Python]]
 +
[[Category:Programming language]]
 +
[[Category:Software]]

Latest revision as of 13:30, 21 July 2014

On this page you will learn how to create your first Python script for your Armadeus board. Python logo.png

Installation

  • Python interpreter and libraries are not installed in the default APF rootfs:
    • Currently it increases the rootfs size by 6 MBytes and so, without cleanup, it won't fit in the old APF9328 boards with 8 MBytes FLASH size. So for the moment, if you have an 8MB FLASH, you can only use it from a NFS or a MMC/SD rootfs. If your are a Python expert you can still delete some files in $ARMADEUS_ROOTFS/usr/lib/python2.7/... and tell us what isn't mandatory and uses a lot of space for nothing.
    • On the APF27/51/28/6, you can activate it without concerning about the FLASH size.
  • Python version available in latest Buildroot is 2.7.
  • Launch Buildroot's menuconfig:
$ make menuconfig

Target packages  --->
    Interpreter languages and scripting  --->
        [*] python
            python module format to install (.pyc compiled sources only)  --->
            core python modules  --->
            external python modules  --->
  • then save your configuration and rebuild your system:
$ make

Source code

  • First take your favorite editor/IDE and create the following script:
import sys
 
    print "APF says: Hello World ! ;-)"
    sys.exit(0)
  • Save it as hello.py

Compilation

Not needed. Transforming python script in executables hasn't been tested yet.

Running

  • Copy your hello.py script on your target through TFTP or NFS export dir or your MMC/SD
  • then on your APF console, launch it:
 # python hello.py
 APF says: Hello World ! ;-)
 #

Now it's up to you !! But keep in mind that Python is extremely powerful and libraries rich, so if you don't pay attention to memory usage of your scripts, you can easily reach the APF9328 RAM size limit: 16 MBytes. On the APF27/51/28/6, it will be much more difficult ;-).

Advanced usages

Disabling modules

Defaults python modules can be enabled/disabled by Buildroot menuconfig.

Installing modules

Default Python installation on Buildroot is "minimal"; for certain usage, it's necessary to install more modules. Here a list of modules tested on the APF9328 :

pyserial

This module is used to communicate through serial port (RS232). The package is really simple to install: 

$ make menuconfig

Target packages  --->
    Interpreter languages and scripting  --->
        [*] python
            ...
            external python modules  --->
                ...
                [*] python-serial

GUI

Links

Retrieved from "http://armadeus.org/wiki/index.php?title=Python_development&oldid=12724"