Set of flashcards Infotronik (Page 1 of 5)

Flashcards	185
Language	Deutsch
Category	Electronics
Level	University
Created / Updated	08.10.2017 / 06.12.2018
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Was ist tinyK20?

Ein Programmer/Debug Probe

Ein Spitzname

Ein Allzweck Board

Ein Microcontroller

Welche Eigenschaften weisst der K22 Zumo Robot (V2) auf?

ARM Cortex-M4F mit 120 MHz

512 Kbyte Flash und 64Kbyte RAM

USB, I2C Beschleunigungssensor, Magnetometer

2 LED's, Buzzer, 1 Reset + user Button

1:75 DC Motors mit Magentic Quadratur Encoder, IR Line Sensor und ein Arduino Header

Welche Eigenschaften weisst das Remote Kit auf?

tinyK20: ARM Cortex-M4, 50 MHz

16 Kbyte RAM

nRF24L01 + 2.4 GHz Transceiver

Nokia 64x48 BW LCD

Joystick Buttons (4way + center), 2 side buttons and one 260mA LiPo Battery

Für was ist das nRF24L01+ Modul?

Ist ein single Chip Transceiver von Nordic Semiconductor.

Dient als Sender (TX) auch als Empfänger (RX)

Generiert den ASM Code für das Remote Gerät

Bietet eine Reihe von sehr praktischen Features wie z.B. Ultra Low Power

Was bedeutet SWO beim ARM Cortex?

Some Weird Option

Software Wizard Outpu

Single Wire Output

Save Word Option

Shift Wire Option

Was ist ein recap bei INTRO?

Sumo robot PCB capacitor.

Collection of all sildes.

Line snesor capacitance.

Learning summary with 5 questions.

Tips for students in next semester.

Bei Verwendung von einem "Workspace" mit Eclipse...

können die Erstellten Projekte im Workspace platziert werden.

können die Estellten Projekte auch ausserhalb des Workspace platziert werden.

können die internen Dateien ohne Probleme verschoben werden.

können alle erstellten Daten geteilt werden z.B. mit einem VCS.

Was beinhaltet der Workspace bei Kinetis Design Studio?

Metadaten (globale Optionen)

Kann Projektdaten enthalten

Nicht relevante Einstellungen

Alle Projektdaten

Merkmale des Eclipse Workspace?

Speichert die .metadaten (globale Optionen/Einstellungen von Projekten)
.metadata dürfen nie verschoben werden
Teile niemals den Workspace mit einem VCS (verwende dafür einen separaten Pfad)
Kann Projekt Ordner enthalten (Empfehlung den WSP und die Projekts zu separieren --> fürVCS)

Nenne Anwendungsgründe für ein VCS (Version Control System)

- Mehrere Personen arbeiten an einem Projekt/Datei

- Änderungsnachweise der Dateiänderungen notwendig

Ein gutes VCS kann was?

Synchronisation, Backups und Zurückschreiben

Kürzliche und auch Ältere Änderungen können verworfen werden

Änderungen Zurückverfolgen (Personalisiert)

Branching and Merging

Autonome Korrekturen vornehmen

Which are Subsystems of an Embedded Systems?

Transforming System

Reactive System

Interactive System

Inactive System

Slowly Systems

What consist a transforming System?

Input Stream ---> System ---> Output Stream

Example:

input mp3 file ---> Smartphone Encodersystem ---> output music

What are typical characteristics or advantages of a transforming system?

Data processing quality

High Throughput

Optimized system load

Optimized Memory Usage

Fast reaction time in Transforming usage

What are typical characteristics or advantages of a reactive system?

External events are drivng system

Guaranteed response time

Control loop (Regelsystem)

Realtime

Throughput

How to consist of a reactive System?

---------------------
I I
I I <-- Measure
I System I
I I --> Control
I I
---------------------

Example: an airbag in a car. Guaranteed response time after an accident.

What are typical characteristics or advantages of a interactive system?

Short response time

High System load

Human-Machine Interaction (HMI)

Guaranteed response time

Data processing quality

How to consist of an interactive System?

O -------------------
\ I / --> Input I I
I <-- Output I System I
/ \ I I
-------------------

Example:

Human input on a calculator --> output on display is the pressed digit/number.

What means realtime?

A Computer is classified as Realtime, if it can react on external events in the real world-

With the correct result
At the right time
Independent of current system load
In a deterministic and foreseeable way

What is a deterministic algorithmus?

Ein deterministischer Algorithmus ist ein Algorithmus, bei dem nur definierte und reproduzierbare Zustände auftreten. Für die gleiche Eingabe folgt auch immer die gleiche Ausgabe und zusätzlich wird die gleiche Folge an Zuständen durchlaufen. Zu jedem Zeitpunkt ist der nachfolgende Abarbeitungsschritt des Algorithmus eindeutig festgelegt. Das bedeutet auch, dass alle Zwischenergebnisse innerhalb des Algorithmus immer gleich sind. (Wikipedia)

When using a workspace with Eclipse?

It contains Eclipse settings and the .metadata should be shared with a team of developers.

I can place my projects into the workspace.

I don't have to place my projects into the workspace.

I can use Eclipse without a workspace.

The processor used on the tinyK20 board is the following:

ARM Cortex-M0+

ARM Cortex-M4

ARM Cortex-M4F

MMA8780Q

MCP4728

Explain in a single sentence what each of the following basic VCS actions mean in Git:

a) Commiting
b) Reverting
c) Pushing
d) Cloning

a) Eine Änderung in das lokale Repository einfügen.
b) Eine lokale Änderung rückgägning machen.
c) Verschieben/Senden einer lokalen Änderung in das Remote-Repository
d) Kopieren eines bestehenden Repository und daraus ein neues lokales Repository erstellen

What is the fundamental difference between SVN and Git?

SVN: centralized VCS
Git: distributed VCS.

Explain the difference between the optimistic and pessimistic approach in a VCS. Explain it with an example.

Optimistic: assumes that two developers do not work on the same file, so system potentially allows conflicts. Conflcts have to be resolved later.

Pessimistic: assumes that conflict will happen, and whenever a developer wants to edit a file, the file gets locked so no conflict can occur.

Provide an example for a hard real-time system?

Air bag
Herzschrittmacher (Pacemaker)
Flugzeugkontrollsystem (aircraft control system)

Provide an example for a soft real-time system?

Video/Music streamer

Name some benefits implementing a state machine?

strukturiert
einfach zu implmentieren
wiederverwendbare Design-Struktur

What should be the first steps when implementing a state machine?

Define all states with input/output and transitions
Draw a diagram.

In Eclipse CDT, using Parallel Build is used for

increasing build speed on the target

reducing build time on the host

reducing code size on the target

increasing code speed on the host

reducing build build errors on the host.

Evaluate the following statements about using floating point operations on ARM Cortex-M4F:

Floating point operations should be avoided if possible

Both float and double ANSI-C data types are are typically 32bit wide

Single precision floating point operations can be performed with hardware accelerator

Double precision floating point operations cannot be performed in a few CPU instructions

In Eclipse CDT, the time to debug a project can be reduced by:

Disabling heuristics for the Indexer

Disabling 'build before debug'

Show line numbers in editor

Enable 'Parallel Build'

Disable SWO in the debug launch configuration

Evaluate the following statements for the workspace concept in Eclipse:

Eclipse Projects cannot be placed in the workspace

Workspace settings are stored in the .metadata folder

To share a workspace, the easiest way is to copy the .metadata folder

The global options for all projects in the workspace are stored in the .metadata folder

Systems can be classified as:

converting, reacting, interacting

measuring, controlling, calculating

transforming, reactive, interactive

interactive, responsive, collective

soft realtime, hard realtime, true realtime

In Eclipse, I can use the following to reference les and folders:

Link to Project

Link to Folders

Link to Files

Virtual Groups

Using #include "../../Utility.h" in sources is problematic because:

Not every compiler might use the same base directory.

The IDE might use different ways to search for files.

This is not a valid way to include header files.

You always have to use backward slashes (\) for includes

Separating header and source files (compared to have them in a single folder) has the following benefits:

± Interface and implementation files are clearly separated.
± Building a library, I have the header files already separated.
± No need to tell the compiler where the header files are.
± Saves a lot of disk space.

1

2

3

4

In ANSI-C, the number '3' in uint16_t var = 3; is of type:

char

uint8_t

uint16_t

int

int32_t

Which function gets called in foo()?

#define CAT(a,b) a##b
void foo(void) {
CAT(t,a)();
}

taab();

TaAb();

ta();

aTbA();

ab();

The term Baremetal refers to:

Naked board with no microcontroller

The metal solder points on a board

The metal inside am embedded microcontroller

Embedded application with no operating system

Microcontroller running one single operating system task

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