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DAPM 1 - Introduction
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- 2. Rules • We suggestyou to come to the course • If you come, you have to respect these rules – start you video camera for the while course – pay attention and ask as many questions as possible 2
- 3. Who we are? •Course – Alexandru Radovici • Lab – Ioana Culic 3
- 4. Exam • Project – 5points – project graded by a jury • Lab & Project Development – 5 points 4
- 5. Outline • Kotlin • AndroidFramework – Activities – Services – Network Services • React Native 5
- 6. Rules • Exam – 50%exam – 50% project • Lab presence – minimum 5 to enter the exam – use a camera 6
- 7. Mobile device • Portabledevice – Small size – Simple tasks • Replacement for – Agenda – Notes – Remote control • Entertainment – Games 7
- 8. Do you knowthem? 8
- 9. Mobile devices iPhone &iPad • iOS • Objective-C • Swift Android • Linux • Java • Kotlin • C/C++ 9
- 10. These used tobe Mobile devices Windows Phone • C# • C/C++ Ubuntu • C/C++ • HTML 5 • Qt SmartPhone • Symbian • C++ • Java MIDP 10
- 11. These used tobe Mobile devices Pocket PC • Windows Mobile • C++, C# Blackberry • BlackberryOS • Blackberry 10 • C/C++ • HTML 5 Telefoane Obisnuite • Nokia OS • Ericsson OS • Java MIDP 11
- 12. Main Components • Microprocessor –RISC – ARM (Advanced RISC Machine) • RAM Memory – SDRAM, DDRAM (DDR4 sometimes) • ROM (usually another partition) – Stores the OS • Screen – Static – Touch • Keyboard • Radio (emitter/receptor) – Phone – WiFi – Bluetooth • External connectors – USB, serial etc. 12
- 13. Secondary Components • Storagedevice – SSD (Solid State Drive) – Memory card (SD, Flash etc.) – Hard Disk • Classic iPod • Sensors – GSP/GLONASS – Accelerometer – Photo Camera • Multimedia Coprocessor – Codec Audio – Codec Video 13
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- 16. Microprocessor • RISC – ReducedInstruction Set Computing – ARM (Advanced RISC Machine) – Simple instructions • Might not have floating point – High clock speed – Reduced power consumption • Scales speed – Examples • Samsung ARM • Qualcomm • Apple A4 – A14 16
- 17. Microprocessor parameters • Clockspeed (MHz) – Not the only relevant • Cache Memory – Processing performance • Power consumption – System’s autonomy • Instruction set • Coprocessors – Audio – Video – Phone 17
- 18. RAM Memory • SDRAM/ DDRAM – Even DDR4 • Limited – 512 MB – 8 GB 18
- 19. ROM (OS partition) •Pocket PC • Read only space – Initial OS image – Persistent after hard reset • May be written – Update – OS modifications 19
- 20. Screen • Important • Usage –Display – User interaction • Limited size • Several resolutions – Independent from the screen size – 320 x 240 (QVGA) – 640 x 480 (VGA) – 320 x 480 (HVGA) 20
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- 23. Resistive Display • Twolayers • Requires pressing • Advantages – Exact touch • Stylus – Low power • Disadvantages – Strong touch – Sensible of the environment 23
- 24. Capacitive Display • Aninsulator layer – Glass / plastic • Does not require a touch • Advantages – Thin touch – Resistant of the environment • Disadvantages – Inexact touch – Higher power 24
- 25. Keyboard • Phone – Numbersonly – 3 letters/ key • QWERTY – Complete keyboard – With numbers • A few functional buttons – Home, back, call, hang-up etc. • No buttons – Full virtual keyboard • Any of the above • Software design problems 25
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- 27. QWERTY and virtualkeyboard 27
- 28. Phone keyboard andQWERTY 28
- 29. A few functionalbuttons 29
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- 31. Radio • Phone – GSM/ CDMA / UMTS – GPRS / EDGE / 3G / 4G – Up to la 25 Km • WiFi – Wireless – 2.4 GHz • Bluetooth – Small networks – Short distance data exchange 31
- 32. WiFi • Implemented inOSI – Standard – TCP / IP most used protocol • Up to 300 m • Speeds – 11 Mbs (802.11b) – 54 Mbs (802.11g) – 300 Mbs (802.11n) 32
- 33. Bluetooth • Viking kingHarald Bluetooth – United Norway and Denmark – Very communicative • Uses non-standard protocols – Intercommunication problems – Problems when devices are from different manufacturers • Speeds – Up to 721 Kbs (1.2) – Up to 3.2 Mbs (2.0) – Up to 24 MB Mbs (3.0) Class Max allowd power (mW) Max allowed power (dBm) Range (aprox) Class 1 100 mW 20 dBm ~100 meters Class 2 2.5 mW 4 dBm ~10 meters Class 3 1 mW 0 dBm ~1 meters 33
- 34. Bluetooth 4 • Smart •LE • Sensors • Standard • Different stack from 3.0 34
- 35. Storage devices • SolidState Drive (SSD) – Fast – Inefficient when deleting • A page at a time – Limited number of writes • Memory card – High capacity (tens of GB) – Removable • Hard Disk – Slow – High power – Motion sensitive 35
- 36. SSD vs. HardDisk 36
- 37. Storage space • Unlimited –Tens of GB – Kind of cheap • High speed – SSD especially 37
- 38. Sensors • GPS /GLONASS – Assisted GPS (AGPS) • Accelerometer • Photo camera • All use the battery – Use with carefully 38
- 39. Conclusions • Mobile devices –Similar in computing power with computers • Processors – RISC – Arm • Display – Small sizes – Touch capacitive / resistive • Storage devices – High capacity – No moving parts • Interaction – Keyboard – Screen • Limited resources • Sensors 39
- 40. Keywords • Mobile device •Smart Phone • Pocket PC / PDA • Blackberry • Windows Mobile • Windows Phone • Android • iOS • Java / Kotlin • Objective-C / Swift • Keyboard – Phone – Virtual – QWERTY – Functional buttons • ARM • RISC • Clock speed • Power consumption • Coprocessors • Solid State Drive (SSD) • WiFi • Bluetooth • GPS / GLONASS / AGPS • Touch screen – Resistive – Capacitive • Resolutions – QVGA – HVGA – VGA 40
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