(r2) Lecture6:BringingTheRaspberryPiToLife < Embedded

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---+ The Raspberry Pi and how to bring it to life
<h2 align="center">Lecture 5<br /><br />Uli Raich<br /><br />UCC semester 2017/2018</h2>

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---+ A first glimpse

There are several versions of Raspberry Pis available on the market:<br /><br />
   * Raspberry Pi 1 Model B released in 2012
   * There is also a simpler and cheaper model A
   * Raspberry 2 with more memory
   * Raspberry Pi zero a stripped down version for 5 US$
   * Raspberry Pi zero W same as zero but with !WiFi and Bluetooth for 10 US$
   * Raspberry Pi 3 fully equipped model that we will be using
For more information look up the<a href="https://en.wikipedia.org/wiki/Raspberry_Pi" title="Wikipedia"> Wikipedia</a> page

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---+ Raspberry Pi specs

<img alt="rpiSpecs.png" height="271" src="%ATTACHURL%/rpiSpecs.png" title="rpiSpecs.png" width="470" />

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---+ Operating systems on the Pi

From the specs we can see that the Raspberry Pi 3 is a full blown computer.<br /><br />With its<br /><br />
   * 64 bit quad core processor
   * 1 Gbyte of RAM
   * 32 Gbyte of SD card
it by far outperforms the 80 kUS$ mini computer I had used to control

a full particle accelerator and it is also much more powerful

than the computer system that allowed the moon landing!

This allows a great deal of flexibility when it comes to

operating systems to be installed on the machine

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---+ Currently available OS
   * Raspbian, a Debian variant of Linux tailored to the Raspberry Pi.<br /><br />
   * It contains most of the software packages you also find on Ubuntu<br /><br />The Desktop is however stripped down to make it more <br /><br />responsive on a processor that cannot cope with the speed of a PC<br /><br />This is what we are using!<br /><br />
   * Ubuntu Mate is a Ubuntu variant for the Pi<br /><br />
   * Windows 10 IOT core, a windows variant. I have never tried this but <br /><br />Windows gurus may give it a try if they cannot live without Windows on the Pi<br /><br />
   * Android: There are several Android versions for the Pi floating <br /><br />around on the WEB. Your success on these may vary<br /><br />
   * Kodi is a multimedia server that will allow you to listen to music, <br /><br />look at photos or watch films. Connect your Pi to a TV set <br /><br />(through the HDMI connector) and a stereo and off you go!
If this is not enough for your then search the WEB for more.

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---+ BCM2835 CPU

The CPU has got an ARM processor core with 4 64 bit CPUs

The operating system and the Linux kernel are still 32 bit versions

(After the course you may try to compile and install

a 64 bit kernel yourself. This is a very good exercise to

understand how the OS is built!)

Around the CPU there are plenty of interfaces

To know the details (the interfaces only!) have a look at the <a href="https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf" title="data sheet">data sheet </a>explaining them (205 pages!)

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---+ BCM2835 peripherals

Here are some of the Raspberry Pi peripherals:
   * UART
   * SPI
   * BSC (serial controller)
   * DMA controller
   * External mass media controller
   * <a href="https://en.wikipedia.org/wiki/Pulse-code_modulation" title="PCM">PCM</a> / <a href="https://en.wikipedia.org/wiki/I%C2%B2S" title="I2C">I2S</a> Audio
   * Pulse Width Modulation
   * Timer
   * USB
   * <a href="http://www.ti.com/lit/an/slva704/slva704.pdf" title="I2C">I2C</a>
   * GPIO
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---+ Raspberry Pi and the real world

You can easily connect<br /><br />
   * General Purpose Input Output signals<br /><br />
   * These are 3.3 V single pin signals used e.g. to drive a LED,<br /><br />a relay or any other device needing a digital signal level<br /><br />
   * You can program it input or output<br /><br />
      * With pull-ups or pull-downs<br /><br />
      * To read switch state<br /><br />
      * To drive a 3.3V output level (and light a LED)

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---+ Connection to bread board: The cobbler
| <img alt="raspberry.png" height="251" src="%ATTACHURL%/raspberry.png" title="raspberry.png" width="322" /> | <img alt="cobbler.png" height="321" src="%ATTACHURL%/cobbler.png" title="cobbler.png" width="328" /> |
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---+ Other Rpi connections

!I2C is a serial bus often used in computer systems of for

short distance interfacing. Many devices having a I2C port

are available and we will program a few:<br /><br />
   * ADC<br /><br />
   * DAC<br /><br />
   * Real time clock<br /><br />
   * EEPROM<br /><br />
   * We also have a 2-line LCD display needing some 8 signals<br /><br />(+ power and gnd). A serial to parallel interface (shift register) <br /><br />with I2C interface eases the connection to the Raspberry Pi <br /><br />as only 4 serial signal lines are needed: SDA, SCL,Vcc, gnd

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-- %USERSIG{UliRaich - 2017-09-13}%

---++ Comments

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Attachments

Topic attachments
I	Attachment	History	Action	Size	Date	Who
png	cobbler.png	r1	manage	60.3 K	2017-09-14 - 08:38	UnknownUser
png	loopMount.png	r1	manage	28.8 K	2017-09-14 - 08:38	UnknownUser
png	raspberry.png	r1	manage	101.0 K	2017-09-14 - 08:38	UnknownUser
png	raspbianImage.png	r1	manage	31.7 K	2017-09-14 - 08:38	UnknownUser
png	raspbianRoot.png	r1	manage	16.3 K	2017-09-14 - 08:38	UnknownUser
png	raspi-config.png	r1	manage	74.6 K	2017-09-14 - 08:38	UnknownUser
png	rpiGPIO.png	r1	manage	77.5 K	2017-09-14 - 08:38	UnknownUser
png	rpiSpecs.png	r1	manage	29.9 K	2017-09-14 - 08:43	UnknownUser

Topic revision: r2 - 2017-09-14 - uli