Ppt on embedded system
- 1. Embedded System Submitted to- Mr. Harinder Sir, Submitted by- Pankaj joshi BCA 2A 1524629 1
- 2. CONTENTS System Embedded System Processor Features Languages for programming Applications 2
- 3. System A system is a way of working, organizing or doing one or many tasks according to a fixed plan, program or set of rules. A system is also an arrangement in which all its units assemble and work together according to the plan or program. 3
- 4. 4SYSTEM EXAMPLES WATCH It is a time display SYSTEM Parts: Hardware, Needles, Battery, Dial, Chassis and Strap Rules 1.All needles move clockwise only 2.A thin needle rotates every second 3.A long needle rotates every minute 4.A short needle rotates every hour 5.All needles return to the original position after 12 hours
- 5. 5EMBEDDED SYSTEM Definition: An Embedded System is one that has computer hardware with software embedded in it as one of its important components. SOFTWARE PROGRAM #include <16f876a.h> #use delay (clock=20000000) #byte PORTB=6 main() { set_tris_b(0); portb=255; //decimal delay_ms(1000); portb=0x55; //hexadecimal delay_ms(1000); portb=0b10101010; //binary delay_ms(500); } HARDWARE
- 6. Processor A Processor is the heart of the Embedded System. An embedded processor is a microprocessor that is used in an embedded system. For an embedded system designer knowledge of microprocessor and microcontroller is a must. Two Essential Units: Operations Control Unit (CU), Fetch Execution Unit (EU) Execute 6
- 7. 7 Microprocessor Microcontroller CPU is stand alone, RAM,ROM, I/O & timer are separate. CPU, RAM,ROM, I/O & timer all are on single chip. Designer can decide amount of RAM,ROM, & I/O ports. Fixed amount of on-chip RAM,ROM, & I/O ports. High processing power Low processing power High power consumption Low power consumption Typically 32/64 bit 8/16 bit General purpose Single purpose(control oriented) Less reliable Highly reliable Eg.- 8086,8085 8051
- 9. Few Examples of Embedded system
- 10. Embedded system for a car
- 11. Components of Embedded System It has Hardware Processor, Timers, Interrupt controller, I/O Devices, Memories, Ports, etc. It has main Application Software Which may perform concurrently the series of tasks or multiple tasks. It has Real Time Operating System (RTOS) RTOS defines the way the system work. Which supervise the application software. It sets the rules during the execution of the application program. A small scale embedded system may not need an RTOS. 11
- 12. Features of an embedded system Single-functioned Executes a single program, repeatedly Tightly-constrained Reactive and real-time Continually reacts to changes in the system’s environment Must compute certain results in real-time without delay
- 13. Languages for Programming Embedded Systems Recent survey indicates that approximately 45% of the embedded software is still being done in C language. C++ is also increasing its presence in embedded systems. As C++ is based on C language, thus providing programmer the object oriented methodologies to reap the benefits of such an approach. 13
- 14. C is very close to assembly programming and it allows very easy access to underlying hardware. A huge number of high quality compilers and debugging tools are available for the C language. Though C++ is theoretically more efficient than C, but some of its compilers have bugs due to the huge size of the language. These compilers may cause a buggy execution. 14
- 15. Real-time Systems Embedded systems in which some specific work has to be done in a specific time period are called real-time systems. Real time embedded systems are classified into two types such as soft and hard real time systems.
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- 17. Mobile Embedded Systems Mobile embedded systems are used in portable embedded devices like cell phones, mobiles, digital cameras, mp3 players and personal digital assistants, etc. The basic limitation of these devices is the other resources and limitation of memory. 17
- 18. Small Scale Embedded System Single 8 bit or 16bit Microcontroller. Little hardware and software complexity. They may even be battery operated. Usually “C” is used for developing these system. The need to limit power dissipation when system is running continuously. Examples:- digital watches Programming tools: Editor, Assembler and Cross Assembler 18
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- 20. THANK YOU 20