Embedded Systems: A Comprehensive Guide to Architecture, Peripherals, and IoT Frameworks
Week 1, Session 1: Embedded SystemsWhat is an Embedded System?
Microcontroller Unit (MCU)
e.g., digital thermometer, washing machine Microprocessor Unit (MPU)
e.g., laptops, servers, high-end drives MCU vs |
Java Inheritance and Interfaces
Levels of Inheritance
3-Level Hierarchy
Java supports multi-level inheritance, where a class inherits from another class that inherits from a base class. For example:
class Animal { void eat() { System.out.println("Eating..."); }} class Dog extends Animal { void bark() { System.out.println("Barking..."); }} class Labrador extends Dog { void color() { System.out.println("Labrador is golden in color."); }} public class Main { public static Operating System Concepts: Memory Management, File Systems, and Processes
1 – Logical vs. Physical Address Space and Memory Allocation
Logical Address
A logical address, or virtual address, is generated by the CPU during program execution. It’s a reference point within the program’s address space and doesn’t correspond to a physical memory location.
Physical Address
A physical address specifies the actual location of data in memory. The Memory Management Unit (MMU) translates logical addresses to physical addresses before accessing data.
Drawbacks of Contiguous Memory Allocation
- External
AP Computer Science A: Java Review & Free-Response Questions
AP COMPUTER SCIENCE 2020 CHEAT SHEET – WILLIAM KONG
1) Strings
A string is a line of text, an object in Java, defined by the String class.
String concatenation – Use the + operator to add multiple strings or numbers.
A string is an array of characters.
Methods of the String Class
int length()– Returns the length of the string.String substring(int from, int to)– Returns a substring from the specified starting index (inclusive) to the ending index (exclusive).String substring(int from)– Returns a substring
Understanding Data Units, Python, R, Excel, and SQL
Understanding Data Units
Common Data Units
Bit (b): The smallest unit of data storage, representing a binary digit (0 or 1).
Byte (B): A group of 8 bits, typically representing a single character.
Kilobyte (KB): 1,024 bytes.
Megabyte (MB): 1,024 KB.
Gigabyte (GB): 1,024 MB.
Terabyte (TB): 1,024 GB.
Petabyte (PB): 1,024 TB.
Exabyte (EB): 1,024 PB.
Zettabyte (ZB): 1,024 EB.
Yottabyte (YB): 1,024 ZB.
Python Basics
Key Concepts
- Python is case-sensitive.
- Indentation is crucial for code blocks.
- The
print()function outputs
Understanding Computer Networks: Communication Structures, Protocols, and Design
Communication Structures
Key Elements:
- Naming and Name Resolution: Identifies processes with host and process IDs, utilizing DNS.
- Routing Strategies:
- Fixed Routing: Predefined path from source to destination.
- Virtual Circuit: Fixed path for a single session.
- Dynamic Routing: Path determined at the time of message sending.
- Connection Strategies:
- Circuit Switching: Dedicated physical link for the duration of communication (e.g., mobile phones).
- Message Switching: Temporary link for a single message transfer