Download ppt presentation for embedded systems and pc 104

In some embedded systems, deadlines are imposed, but not adhering to them once in a while may not lead to a catastrophe. For example, consider a DVD player. Suppose, you give a command to the DVD player from a remote control, and there is a delay of a few milliseconds in executing that command.

Such systems are called soft real-time systems. Hard Real-Time Embedded System Networked Information Appliances Embedded systems that are provided with network interfaces and accessed by networks such as Local Area Network or the Internet are called networked information appliances.

These systems have emerged in recent years. Each embedded system can send real-time data to a central location from where the entire process control system can be monitored. The monitoring can be done using a web browser such as the Internet Explorer. The web camera can send pictures in real-time to any computer connected to the Internet.

When your children stand in front of the door lock after they return from school, the web camera in the door-lock will send an alert to your desktop over the Internet and then you can open the door-lock through a click of the mouse. This slide shows a weather monitoring system connected to the Internet. Any computer connected to the Internet can access this system to obtain real-time weather information.

If the appliance has to provide information over the Internet, HTTP web server software also needs to run on the system. The limitations of the mobile devices — memory constraints, small size, lack of good user interfaces such as full fledged keyboard and display etc. Hence, mobile devices are considered as embedded systems. However, the PDAs are now capable of supporting general purpose application software such as word processors, games, etc.

Languages for Programming Embedded Systems Assembly language was the pioneer for programming embedded systems till recently. Nowadays there are many more languages to program these systems. The presence of tools to model the software in UML, SDL is sufficient to indicate the maturity of embedded software programming The majority of software for embedded systems is still done in C language.

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. These compilers may cause a buggy execution.

Communication Interfaces For embedded systems to interact with the external world, a number of communication interfaces are available. Which is the best suited microcontroller for design of embedded system? There is always a trade off between efficiency and power dissipation.

To know this, let us review the various types of microcontrollers and their specifications and the vendors. From the previous slide we can find that the ARM processor is a strong option for better performance. But the Texas instruments MSP with wide range of operation modes consumes only 1. So it is always left to the designer to choose a suitable device according to the requirement.

Design of an embedded system — a Case study To understand the design of a simple embedded system let us first consider the idea of a data acquisition system. The data acquisition system is shown in the next slide.

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