1) EASTsys is used in a relevant computer electronic controlling system proceeding effective system testing, detecting and monitoring in many kinds of weapon equipments, especially in the applications of system-level software verification testing and validation testing. EASTsys includes embedded software testing and controlling tool, simulation models developing tool, testing results analysis tool, real-time simulation machine, I/O device and so on.

2) EASTsys proceeds software real-time verification testing under the conditions of real environments, thereby proceeding exact testing of real-time performance and robustness requested by softwares.

3) Through the simulations of real cases, EASTsys not only can reduce the risks and costs, meanwhile record every operation of softwares for testing at large, but also confirm whether softwares for testing are eligible or not by testing their responses and disposals in various cases are correct, reasonable or not. According to the scenes provided by testing scripts and simulation models, EASTsys can find the potential defects so as to improve the reliability of softwares.

4) The current software testing tools are taken into sufficient consideration by the design of EASTsys which combines with the general means of embedded software testing, as well as starts from the requirements of actual testing work. As improving the generalization and expansibility of the whole system, EASTsys guarantees the reliability of software testing platform and meets the needs of customers for embedded software testing.

1. The system functions of EASTsys

1.1 keywords

Embedded software testing

Simulation environment

Real-time scheduling

1553B Bus and so on

1.2 system functions

1.2.1 Functions of embedded software simulation testing system as follows:

1) According to the requirements of softwares under testing, the datum of simulation fieldbus system can provide softwares under testing with all the stimulation from the bus beyond themselves.

2) According to the different testing objects, the embedded software simulation testing system can provide all kinds of electric signal power origins beyond the bus.

3) Real-time monitoring and analysis for running state of fieldbus.

4) Provide nice man-machine alternation interface, control all the facilities of real-time online testing and evaluating platform, complete software testing and evaluation, provide needed cases of all the software testings.

5) Complete every real-time scheduling of testing and evaluating cases and tasks, guarantee real-time feature needed by software testing and evaluation.

2. Detailed design

Embedded software simulation testing system is a system of concentrating data management and distributing data disposal based on lacal area network, which is composed of real-time simulation computer, I/O system, software evaluating and controlling modules, testing results analysis tool, bus simulation and bus monitoring and controlling modules as well as real-time scheduling modules.

2.1 embedded software simulation testing system design

The embedded software simulation testing system takes a sever with high-reliability and high-stability as the testing data exchange center of real-time online testing and evaluation, where all the testing datum are memorized.

As the embedded software simulation testing is proceeding, the testing and evaluating process is controlled by software testing and evaluating terminal. Each front end facility can be set by software testing and evaluation terminal. Meanwhile, the datum and analysis results collected by all the front end facilities can be displayed on software testing and evaluating terminal. Testing and evaluating cases generated by each front end are sent out by testing and evaluating terminal.

2.1.1 facility framework

Generalization and high-reliability technologies have been possibly adopted into models selection of facilities and designs of embedded software simulation testing systems, also designed combining with standard interface, which can improve generalization and displacement of embedded software simulation testing systems, moreover ensuring the expansibility of the platform. Figure 1 is the facility framework of embedded software simulation testing system.



Figure 1. the facility framework of embedded software simulation testing system.

2.1.2 external interface design

1) There are two main types of interfaces in embedded software simulation testing system, one is fieldbus interface and the other is the interfece providing all kinds of electrical signals to the board of the embedded software under testing.

2) The designs of this embedded software simulation testing systems adopt the buses of the fieldbuses1553B. So the bus interfaces of the systems are the fieldbus interfaces. The hardware designs of these interfaces must keep in step with the interfaces of facilities under testing.

3)Since there are a large number of embedded softwares in the facilities under testing and the differences of electrical signal interfaces in each embedded software boards, so different softwares in external interfaces design must be fully considered. The generations of external sensor stimulation signals during software testings is have close connections with their dynamics modelling softwares. The descriptions of electrical signal interfaces of software boards are not included in this scheme. During the real-time online evaluation of this software, necessarily with the cooperation with the relevant facilities.

According to the practical situations of each embedded software board, the external interface of embedded software simulation testing system is as table 1.

Table 1

2.1.3.1 real-time scheduling

Real-time Scheduling software is the centre of real-time online evaluation platform, which gathers the datum from terminal and front end as well as the datum from other facilities, then distributes to relevant facilities.

2.1.3.2 software evaluating and controlling

Software evaluating and controlling terminal adopts with PC. As for the software evaluating and controlling terminal in this platform is the only facility, to which evaluators have to face in a long term, so the terminal adopts with a better configuration.

2.1.3.3 bus simulation

Bus simulation front end uses a IPC with high reliability based on PXI bus, which is PXI chassis. This chassis provides PXI peripheral slot in a system. And all the PXI slots provide internal 10MHz reference clocks regulated in PXI standards, as well as star triggers, PXI trigger buses and PXI part buses.

All the PXI chassises are equipped with the technical grade ATX electric power for providing the system with economic and reliable power. The alarm-reporting module of chassises can watch over the state of power supply, temperature and cooling fan. Once a mistake is found, the LED and buzzer will start working. The malfunctioned fan can be taken out of the front end panel and support hot-plugging, which can reduce the average restoring time.

2.1.3.4 bus monitoring analysis front end

The hardware design of both bus monitoring analysis front end and bus simulation front end is same.

2.1.3.5 external signal interface facilities

The platform of external signal interface facility is the same as the bus simulation front end, which is also the PXI chassises equipped with PXI system controller. According to the current software evaluating objects, the types of cards equipped with external signal interface facilities are digital amount I/O card and simulation amount I/O card.

2.1.3.6 1553B fieldbus cables

Processing according to bus interface style for actual use, then it is used for software evaluating bus and through cables.

2.1.3.7 network supporting facilities

The LAN of embedded software simulation testing system uses Fast Ethernet and TCP/IP in industrial standard, which provides standard interconnection hardware and software interface for the whole system, simplifies the interface of each evaluating facilities and also provides topology flexibility to the maximum, guarantee biggish expandability of the system.

The network facilities include fast Ethernet routing exchange computer and network writing.

2.1.4 software design

The embedded software simulation testing system is composed of four parts, which are real-time testing software, software evaluating and controlling software, bus simulation software, bus monitoring and analysis software, external signal interface facilities controlling software. All above softwares have adopted the uniform requirements of software network interface for the convenience of functions expansion and the development and debug of softwares.

2.1.4.1 real-time scheduling software

Through the fast Ethernet, the real-time scheduling software recieve the datum from front end and external interface facilities, then save into the database, and in the mean time convey to software evaluating and controlling terminal. The main functions are as following:

1) Under real-time working state, receive all kinds of data packets formed by front end and external interfaces, save into the background database after dealing with, and then convey the above database to software evaluating and controlling teminal.

2) Under real-time working state, receive and record controlling instructions such as front end or external signal interface facility configuration parameter, evaluating and controlling enabled instruction, evaluating and controlling case instruction as well as simulation evaluating datum sent by the evaluators from software evaluating and controlling terminal, save into the background database after dealing with, and then convey the above contents to relevant front end and external signal interface facilities.

3) Analyze the playback state at last, search evaluating datum from database according to the requirements of software evaluating terminal, then convey to evaluating terminal, for the convenience of evaluators to have data analysis and testing report writing.

4) Communicate with other computers by using standard TCP/IP Agreement.

2.1.4.2 software evaluating and controlling software

Software evaluating and controlling software is running on software evaluating and controlling terminal. The operating system is Windows 2000/xp. The main functions are as following:

1) Realize the basic operations of software evaluators’ login, certification of identification and quit.

2 ) Real-time receive all types of front end and external interface facilities datum from real-time scheduling platform.

3) According to the testing system parameter manipulation fomular from all the sensors, depose the software process part of real-time true code datum into relevant testing system fomular from all types of sensors.

4) Receive the bus datum from bus monitoring analysis front end, then deal with in the classification and display.

5) Be able to playback datum in some time quantum as well as deal with and display according to software evaluators’ requests.

6) Software evaluators can send out remoted instructions and inject datum through the interface.

7) Display remoted fomular sent out or the name, code number and time of the injection datum .

8) Provid friendly controlling interface, and complete the control of each front end and external interface facility.

9) Print a certain web page according to the request of users.

2.1.4.3 bus simulation and bus monitoring analysis software

Bus simulation and bus monitoring analysis software is running on the bus simulation front end. The operating system is Windows 2000. The main functions are as following.

1) Install and initialize the 1553B card.

2) Realize simulation of each intelligent terminal on bus together with the self-measurement ability, according to the request of 1553B application layer agreement.

3) Install the activated state of each simulation unit on bus. The activated facilities can be assembled freely.

4) If the software under testing is the management software, bus simulation software neednot simulate output frame testing. When other softwares are evaluating, bus simulation software needs to realize frame-combination function of testing system datum from each sensor, then making the testing system datum from each sensor as the testing datum sent to real-time scheduling platform.

5) If the software under testing is the management software, bus simulation software neednot receive injection database sent by software evaluating terminal, and simulate the injection datum from bus. When other software are evaluating, bus simulation software need to got this functions.

6) Have the functions of local control and long-range control. The long-range control is realized through the software evaluating and controlling terminal. In the stage of local control, the datum should be recorded completely.

7) Provide friendly controlled interface.

2.1.4.4 external signal interface facilities controlling software

External signal interface facilities controlling software is running on external signal interface facilities. The operating system is Windows 2000/xp. The main functions are as following.

1) According to the different evaluating objects, this software complete the function of simulation software under testing external interface with various settings for external signal interface facilities.

2) Initialization according to all types of cards.

3) According to the diferent evaluating objects, this software is proceeding the simulation external encouragement needed by on the object under testing, and proving I/O with enough channel quantities.

4) During management software testing, external signal interface facilities should have the ability of sending the testing system datum from each sensor to the server.

5) During management software testing, external signal interface facilities provide serial data interface and inject datum to management unit simulated by data-injection channel.

6) Have the function of local control and long-range control. The long-range control is realized through the software evaluating and controlling terminal. In the stage of local control, the datum should be recorded completely.

7) Provide friendly controlled interface.

2.1.5network conmunication protocol

2.1.5.1Network

It is composed of gigabit network switches, server and terminal.

2.1.5.2 conmunication protocol

network protocol:TPC/IP

3. The configuration table of embedded simulation testing system