Search

In this paper the construction of a low cost data acquisition system, based on code generator tools that we built, is shown. A microcontroller is a key component used to read from analog-to-digital converter which receives instructions from client applications. The microcontroller runs platform independent code being accessed by clients as common CORBA or Web Services servers through bind servers. A bind server translates high level requests coming from clients to simple ones dedicated to microcontrollers. Both bind and embedded servers are generated by code generators that we built. Generated embedded server code size after compilation is very small making it possible to be written on limited devices such as 8051 microcontrollers. The data acquisition system, organized in a service oriented (SOA) fashion, consists of several modules. Modules read periodically battery output voltage for which the system is built and store it to a database. Modules can fire alarms when data is out of predefined limits. At the end a graph of the data obtained in function of time is shown. [ABSTRACT FROM AUTHOR]

The integration of microcontrollers as very limited devices, in conventional service-oriented architectures (SOA) based systems is presented in this paper. These systems serve mainly for data acquisition and soft real-time control. Microcontroller’s role as embedded device is to receive commands from powerful device such as personal computer and apply respective signals to sensors and actuators. The SOA based system organization helps in further system expansion and maintenance in standardized way. Since the implementation of SOA requires large code and data memory making them unsuitable for embedded systems, we propose a solution by introducing the concept of bind server. Bind server takes the responsibility of complex tasks leaving the microcontroller to deal with simple ones. We report very small sizes of code and messages exchanged for server implemented in microcontroller. [ABSTRACT FROM AUTHOR]

This paper shows the code and message footprints of generated embedded server to be implemented in microcontroller. The code is generated by the code generator tools we constructed. Generated code represents simplified versions of CORBA and Web Services server. We give an example of temperature sensor and thermostat definition in IDL as well as its implementation, by one instance each. We show the size of server's code after compilation, and corresponding message sizes. Besides message sizes, each byte of respective message is described in detail. Obtained results are much better than in related work when server's size is considered and are comparable with those in related work when message sizes are considered. [ABSTRACT FROM AUTHOR]