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Programming the Raspberry Pi element14
This document provides an overview of programming the Raspberry Pi by walking through setting it up, flashing an SD card, logging in, using the text editor JOE to write "hello world" programs in Python and C, downloading more complex examples, and configuring display settings. Key steps include downloading an OS image, flashing the image to an SD card, logging in with the username "pi" and password "raspberry", using JOE to write and run simple programs, and editing the configuration file to control settings like screen resolution. The goal is to demonstrate the basic workflow for getting started with programming on the Raspberry Pi.
Programming the Raspberry Pi element14
- 1. Programming the RaspberryPi Dr Eben Upton Raspberry Pi Foundation
- 2. contents • introduction • unboxingand setup • flashing an SD card • logging in for the first time • the JOE text editor • running the “hello world” program• running the “hello world” program • a (slightly) more complex example • an OpenGL ES graphics program in C • the configuration file • wrap up
- 3. introduction • Raspberry Piis a small, cheap ARM-based PC for education and hobbyists • Runs Debian GNU/Linux from an SD card – Standard image available from Feature Specification CPU 700MHz ARM1176-JZFS GPU Broadcom VideoCore IV Memory 256MB LPDDR2-800 Video HDMI, composite Audio HDMI, stereo analog – Standard image available from http://www.element14.com – Includes a broad range of tools and examples • General-purpose IO connector allows simple interfacing Audio HDMI, stereo analog USB 2 x USB2.0 (model B) Storage SD card Networking 10/100 Ethernet Power 5V micro USB
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- 15. putting it alltogether
- 16. putting it alltogether
- 17. flashing an SDcard • You may have purchased a pre- installed card • Otherwise, you will need to – Download an image and a copy of the tool dd-removable from www.element14.com/raspberrypi – Flash the image onto a 2GB SD card from a Windows PC • Insert the card into a card reader • At a command prompt, type – dd-removable --list – dd-removable bs=1M if=sd.img of= ?DeviceHarddisk<X>Partition0 -progress – Substituting the appropriate number for <X>
- 18. flashing an SDcard
- 19. flashing an SDcard • You may have purchased a pre- installed card • Otherwise, you will need to – Download an image and a copy of the tool dd-removable from www.element14.com/raspberrypi – Flash the image onto a 2GB SD card from a Windows PC • Insert the card into a card reader • At a command prompt, type – dd-removable --list – dd-removable bs=1M if=sd.img of= ?DeviceHarddisk<X>Partition0 -progress – Substituting the appropriate number for <X>
- 20. logging in forthe first time • Insert a card • Apply power to the device • Red LED should come on • After 5 seconds – Green LED should begin to flicker – Text should appear on the screen– Text should appear on the screen • At the login prompt enter the username pi, and password raspberry • You may want to set the clock!
- 21. logging in forthe first time
- 22. logging in forthe first time • Insert a card • Apply power to the device • Red LED should come on • After 5 seconds – Green LED should begin to flicker – Text should appear on the screen– Text should appear on the screen • At the login prompt enter the username pi, and password raspberry • You may want to set the clock!
- 23. the JOE texteditor • Standard image bundles JOE – Simple programmer’s text editor – Syntax highlighting for Python and C • At the command line, type joe helloworld.py • When the editor appears, type• When the editor appears, type print “hello world” • Now type Ctrl+K and then X to save and exit • More documentation available at http://joe-editor.sourceforce.net
- 24. the JOE texteditor
- 25. the JOE texteditor • Standard image bundles JOE – Simple programmer’s text editor – Syntax highlighting for Python and C • At the command line, type joe helloworld.py • When the editor appears, type• When the editor appears, type print “hello world” • Now type Ctrl+K and then X to save and exit • More documentation available at http://joe-editor.sourceforce.net
- 26. running the “helloworld” program • We just wrote our first program! • We can run it using the bundled Python interpreter • At the command line, type python helloworld.py • The text “hello world” will appear• The text “hello world” will appear • You can also run Python in “interactive mode” by just typing python • A great way to experiment with the language
- 27. running the “helloworld” program
- 28. running the “helloworld” program • We just wrote our first program! • We can run it using the bundled Python interpreter • At the command line, type python helloworld.py • The text “hello world” will appear• The text “hello world” will appear • You can also run Python in “interactive mode” by just typing python • A great way to experiment with the language
- 29. a (slightly) morecomplex program • A series of examples, building up to a simple game of Snake, can be downloaded and unpacked by typing wget http://www.raspberrypi.org/game.tar.gz tar xvfz game.tar.gz
- 30. a (slightly) morecomplex program
- 31. a (slightly) morecomplex program
- 32. a (slightly) morecomplex program • A series of examples, building up to a simple game of Snake, can be downloaded and unpacked by typing wget http://www.raspberrypi.org/game.tar.gz tar xvfz game.tar.gz
- 33. an OpenGL ESgraphics program in C • Raspberry Pi incorporates a powerful graphics accelerator • We bundle a simple example – Written in C, using OpenGL ES – Source can be found in /opt/vc/src/hello_pi/hello_triangle/opt/vc/src/hello_pi/hello_triangle • To run the example – Change directory using cd – Build it using make – Run it by typing ./hello_triangle.bin • Try editing the source and the makefile using JOE
- 34. an OpenGL ESgraphics program in C
- 35. an OpenGL ESgraphics program in C • Raspberry Pi incorporates a powerful graphics accelerator • We bundle a simple example – Written in C, using OpenGL ES – Source can be found in /opt/vc/src/hello_pi/hello_triangle/opt/vc/src/hello_pi/hello_triangle • To run the example – Change directory using cd – Build it using make – Run it by typing ./hello_triangle.bin • Try editing the source and the makefile using JOE
- 36. an OpenGL ESgraphics program in C • More complicated examples available online, including Quake 3 at https://github.com/raspberrypi/quake3
- 37. an OpenGL ESgraphics program in C
- 38. an OpenGL ESgraphics program in C
- 39. an OpenGL ESgraphics program in C • More complicated examples available online, including Quake 3 at https://github.com/raspberrypi/quake3
- 40. the configuration file(advanced users) • At startup, Raspberry Pi reads config.txt from the SD card – Controls display and overclocking – Edit from a PC or on device using joe /boot/config.txt • Common options include • A typical configuration file # select 16:9 PAL sdtv_mode=2 sdtv_aspect=3 • Common options include – arm_freq set ARM clock speed – gpu_freq set GPU clock speed – sdtv_mode select PAL/NTSC – hdmi_mode force HDMI resolution – overscan_* set screen border • Very easy to break your install # medium size borders overscan_left=28 overscan_right=28 overscan_top=16 overscan_bottom=16
- 41. wrap up • We’veseen how to – Set up, boot and configure your Raspberry Pi – Create and edit text files using the JOE editor – Run a simple Python script – Download and unpack more examples – Build and run one of the bundled C programs– Build and run one of the bundled C programs • Remember Raspberry Pi is just a GNU/Linux box – Many books and online tutorials available • Don’t be afraid to play around with software – At worst you’ll have to reflash your SD card