CN102306462A - Simulation teaching system for single-chip microcomputer curriculum - Google Patents
Simulation teaching system for single-chip microcomputer curriculum Download PDFInfo
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Abstract
The invention provides a simulation teaching system for a single-chip microcomputer curriculum. The system comprises at least a functional circuit board that includes a single-chip microcomputer and the function of the functional circuit board is realized under the control of the single-chip microcomputer. Besides, the simulation teaching system also comprises a teacher computer, a student computer, an RS485 communication line and a communication conversion module. The teacher computer is a teaching computer and is also used for executing software simulation, soft and hardware simulation and pure hardware simulation. The communication conversion module is connected with the teacher computer and the student computer and converts an RS232 interface into an RS 485 interface; besides, the communication conversion module is connected with the functional circuit board by the RS485 communication line. According to the simulation teaching system for the single-chip microcomputer curriculum provided in the invention, problems that teaching of a current single-chip microcomputer curriculum is abstract and there is no good simulated teaching means are solved; a mode of combination with concrete projects is employed, so that it is convenient for understanding and grasp for students.
Description
Technical field
The present invention relates to simulation teaching system, particularly relate to a kind of single-chip microcomputer course simulation teaching system.
Background technology
Currently, there are very skilled people need to master microcontroller, as long as the master microcontroller skills to find a job to worry about, this is certainly the case in colleges and universities across the country every year, a large electronic smart car contest or competition, these competitions almost all questions related to the microcontroller, many companies have recognized the National Electronic smart car contest contest or award certificates, for science and engineering colleges and universities have opened SCM courses or Computer Principles of curriculum, but students generally reflect the SCM curriculum bad master, There are several main reasons, the first course to the microcontroller and the C language binding is the business needs, while the C language is the single-chip pre-program course, if the C language, customs, however, microcontroller programming it difficult to pass this off; second the microcontroller and electronic technology course curriculum to combine SCM is not isolated, and the electronic circuit is connected to the future to play a role, but is pre-electronic technology course curriculum; third is mainly scripted teaching methods, there is no actual project combined, the students still feel very abstract; fourth is not a good simulation teaching tool.At application number is in the one Chinese patent application of CN200710026430.0; A kind of experiment device for teaching based on programmable logic device (PLD) has been proposed; Microcontroller adopts 51 series monolithics, and embedded artificial debugging software is connected with microcontroller through serial communication mode or Ethernet mode.At application number is in the one Chinese patent application of CN200620169001.X; A kind of USB type one-chip machine simulation experiment instrument has been proposed; Has usb circuit on this USB type one-chip machine simulation experiment instrument; This usb circuit converts usb bus to serial port and links to each other with single-chip microcomputer; Experiment instrument can directly carry out real-time simulation debugging to experimental circuit on the experiment instrument and program with after the PC USB interface links to each other under the KEIL of PC environment.In above-mentioned two pieces of patented claims, all be to use embedded artificial debugging software, when artificial debugging, must connect by the experimental apparatus of emulation or brassboard, brought inconvenience to teaching.We have invented a kind of new single-chip microcomputer course simulation teaching system for this reason, have solved above problem, adopt item teaching method simultaneously, make classmates grasp single-chip microcomputer technical ability very soon, have improved student's employment rate, can play good teaching efficiency again simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of single-chip microcomputer course simulation teaching system; It adopts the mode that combines with detailed programs; In system, carried out software emulation before this; Soft or hard combines emulation again; Last simulation hardware again; And when carrying out software emulation, total procedure division of functional circuit plate is become many program modules, be convenient to students understand and grasp.
The object of the invention can be realized through following technical measures:
Single-chip microcomputer course simulation teaching system; Comprise at least one block of functional circuit plate; This functional circuit plate comprises single-chip microcomputer; And under the control of this single-chip microcomputer, realize the function of this functional circuit plate; This single-chip microcomputer course simulation teaching system also comprises teacher computer; Student machine; RS485 communication line and communication transfer interface module; This teacher computer is the computer of a teaching usefulness; And executive software emulation; Software and hardware emulation and pure simulation hardware; Said student machine is one or multiple computers; Executive software emulation and soft or hard combine emulation; Said communication transfer interface module is connected in said teacher computer and said student machine; The RS232 interface conversion is become the RS485 interface, and link to each other with said functional circuit plate through said RS485 communication line.
The object of the invention also can be realized through following technical measures:
Said teacher computer links to each other through said communication transfer interface module and said RS485 communication line on the successful basis of said software emulation and realizes the said software and hardware emulation identical with said functional circuit plate; Said teacher computer sends the function that Debugging message detected and verified said functional circuit plate to said functional circuit plate, and said pure simulation hardware is carried out for the executable code after combining artificial debugging successful said soft or hard downloads in the said single-chip microcomputer from said teacher computer.
Preferably; Said functional circuit plate also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit; Functional module and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said functional circuit plate; Said functional module realizes the function of said functional circuit plate under the control of said single-chip microcomputer, said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
Preferably; Said functional circuit plate is monitor board, check-out console and interlock plate; This check-out console detects the concentration of fuel gas and detected concentration value is passed to said monitor board by said RS485 communication line; Said monitor board executive real-time monitoring; And show that said check-out console passes the said concentration value of coming; Read clock information; The display system running status; Handle keypad information; And when finding that said concentration value that said check-out console sends surpasses low limit value; Said monitor board sends to said interlock plate by said RS485 communication line and starts the blower fan instruction; Blower fan starts under the control of said interlock plate; When finding that said concentration value that said check-out console sends surpasses ceiling value; Said monitor board sends the cutting-off valve instruction and starts the blower fan instruction to said interlock plate by said RS485 communication line; Said blower fan starts under the control of said interlock plate, and valve cuts off under the control of said interlock plate.
Preferably; Said check-out console also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said check-out console, and said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
Preferably; Said check-out console also comprises gas probe and signaling conversion circuit; This signaling conversion circuit sends the said concentration value that the concentration information of this gas probe converts 0 to 5 vor signal to said single-chip microcomputer, and said single-chip microcomputer passes to said monitor board through said RS485 change-over circuit and said RS485 interface circuit with said concentration value.
Preferably; Said check-out console also comprises decides power module and second pilot lamp; This power module converts direct current 48 vor signals to direct current 5 vor signals, and this direct current provides power supply for said check-out console for 5 volts, and said second timing indicator whenever glimmers at a distance from 1 second and represent that once said check-out console is in proper working order.
Preferably; Said interlock plate also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said interlock plate, and said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
Preferably; Said interlock plate also comprises valve controling circuit and draught fan control circuit; This valve controling circuit is connected in said single-chip microcomputer with this draught fan control circuit; When said this single-chip microcomputer receives the instruction of said fan starting; Said draught fan control circuit is passed in said fan starting instruction; Said draught fan control circuit is controlled said fan starting; When said single-chip microcomputer receives the instruction of said cutting-off valve; Said valve controling circuit is passed in said cutting-off valve instruction, and said valve controling circuit cuts off said valve.
Preferably; Said interlock plate also comprises power module, second and decides pilot lamp, blower fan pilot lamp and valve pilot lamp; This power module converts direct current 48 vor signals to direct current 5 vor signals; This direct current provides power supply for said interlock plate for 5 volts; Said second timing indicator whenever glimmers at a distance from 1 second and representes that once said check-out console is in proper working order; Said blower fan pilot lamp is lighted expression said fan starting and pilot lamp and is extinguished the said blower fan of expression and stop, and described valve pilot lamp lights that the said valve of expression cuts off and pilot lamp extinguishes the said valve of expression and connects.
Preferably; Said monitor board also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said monitor board, and said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
Preferably; Said monitor board comprises that also charactron shows; Said single-chip microcomputer sends the querying command packet by said RS485 change-over circuit and said RS485 interface circuit to said check-out console; Comprise address byte and querying command byte in this querying command packet; Said check-out console receives this querying command packet and resolves; If the identical concentration information bag that includes the concentration byte of just uploading with the setting address of said check-out console of this address byte in this querying command packet, said monitor board will be presented at said charactron from the said concentration value that said check-out console receives and show.
Preferably; Said monitor board also comprises status indicator lamp and warning circuit; If said concentration value surpasses said low limit value or said ceiling value; Failure message when said concentration value surpasses said low limit value or surpasses said ceiling value will be presented at that said charactron shows and said status indicator lamp on; And be stored in the internal storage of said single-chip microcomputer, start said warning circuit and notify the maintainer to arrive the site disposal fault.
Preferably; If said concentration value surpasses said low limit value or said ceiling value; Said single-chip microcomputer sends the interlock command packet by said RS485 change-over circuit and said RS485 interface circuit to said interlock plate; Comprise address byte, blower fan action byte and valve event byte in this interlock command packet; Said interlock plate receives said interlock command packet and resolves; If the identical interlock feedback information bag of just uploading in the setting address of address byte in the interlock command packet and said interlock plate; And according to the said blower fan of Numerical Control of said blower fan action byte with according to the said valve of the Numerical Control of said valve event byte; Comprise the return code byte in this interlock feedback information bag; The value of this return code byte is that 0 expression interlock is normal; Be that 1 expression interlock is unusual; Said monitor board receives the feedback information bag from said interlock plate; And feedback information is presented at said status indicator lamp and said charactron shows; When said feedback information declaration of exception interlock plate breaks down, said monitor board starts said warning circuit and notifies the maintenance personal to repair said interlock plate.
Preferably; Said monitor board also comprises keyboard circuit, clock circuit; Link to each other with said clock circuit receive clock signal and on said charactron shows, show current date and time of said single-chip microcomputer, said keyboard circuit is used for setting, modification and the inquiry of information or order.
Preferably, said monitor board also comprises power module, and this power module converts direct current 48 vor signals to direct current 5 vor signals, and this direct current provides power supply for said monitor board for 5 volts.
The technician is not difficult to find out that the scheme that combination in any constituted of above-mentioned each preferred version all is a part of the present invention.
Single-chip microcomputer course simulation teaching system among the present invention is software emulation before this, and soft or hard combines emulation again, at last simulation hardware again; When carrying out software emulation, allow the programming skill of students grasp single-chip microcomputer from the superficial to the deep, we become many program modules with total procedure division of functional circuit plate, and total system is finally accomplished in the explanation of module and emulation one by one.At application number is that one Chinese patent application and the application number of CN200710026430.0 is in the one Chinese patent application of CN200620169001.X; What use is that 51 series monolithics are carried out emulation; And 51 series monolithics are to eliminate kind; Its cost performance can not show a candle to the AVR series monolithic; Single-chip microcomputer course simulation teaching system among the present invention carries out emulation to the AVR series monolithic just; Above-mentioned two patents all be to use embedded artificial debugging software; When artificial debugging, must connect by the laboratory apparatus of emulation or brassboard; Single-chip microcomputer course simulation teaching system among the present invention can be realized pure software emulation; Needn't connect laboratory apparatus or brassboard; Carry out software emulation by computer; To adorn the simulation software of Protues7.5, the C Programming with Pascal Language software of ACCAVR on the computer; AccessPort assistant software and other related software; Classmates draw by the functional circuit plate schematic diagram of emulation with the Protues7.5 simulation software; In this simulation software interface, just copying can have been carried out; In this simulation software, also have emulation instruments such as emulation oscillograph, emulation universal meter and signal generator; Simulated effect is come into plain view; Each classmate not only can the copying circuit board in the classroom, the copying circuit board of can also staying at home.In addition; Single-chip microcomputer course simulation teaching system among the present invention is based on successful operation system for many years in the intelligent building; The total interface circuit that has almost comprised the AVR series monolithic, through teaching, the knowledge that classmates have not only learnt single-chip microcomputer is can also theory and combining actual.And; Single-chip microcomputer course simulation teaching system among the present invention has solved a difficult problem that aspect the serial communication teaching, is difficult to explanation; Main cause is not have real and the full system of function; And adopted the RS485 communication network that in industry, is widely adopted among the present invention; Through teaching, the serial communication knowledge that classmates have not only learnt single-chip microcomputer is can also theory and combining actual.Also adopted soft or hard to combine emulation in the present invention, just computer is joined a communication transfer interface module outward and just can be simulated a real functional circuit plate.After completing successfully, can adopt software emulation soft or hard to combine emulation to come functional circuit plate that is virtually reality like reality.Single-chip microcomputer course simulation teaching system among the present invention not only can but also can have been imparted knowledge to students in multi-media classroom at laboratory teaching; Because having adopted communication network is the RS485 communication network; Adopt twisted-pair feeder to connect computer and each functional circuit plate; Fairly simple so connect up; Implement than being easier to, make the student grasp single-chip microcomputer technical ability very soon and reached simultaneously good teaching efficiency again.
Description of drawings
Fig. 1 is the structural drawing of a preferred embodiment of single-chip microcomputer course simulation teaching system of the present invention;
Fig. 2 is the structural drawing of another preferred embodiment of single-chip microcomputer course simulation teaching system of the present invention;
Fig. 3 is the emulation schematic diagram of the check-out console in the single-chip microcomputer course simulation teaching system shown in Figure 2;
Fig. 4 is the emulation schematic diagram of the interlock plate in the single-chip microcomputer course simulation teaching system shown in Figure 2;
Fig. 5 is the emulation schematic diagram of the monitor board in the single-chip microcomputer course simulation teaching system shown in Figure 2
Fig. 6 is the querying command communication format in the single-chip microcomputer course simulation teaching system shown in Figure 2;
Fig. 7 is the interlock command communication form in the single-chip microcomputer course simulation teaching system shown in Figure 2.
Embodiment
For make above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter the spy enumerates preferred embodiment, and cooperates appended graphicly, elaborates as follows.
As shown in Figure 1, Fig. 1 is the structural drawing of a preferred embodiment of single-chip microcomputer course simulation teaching system of the present invention.In order to make the single-chip microcomputer course have good teaching efficiency; Can improve simultaneously classmates' the ability of analyzing problems and solving them again; We have designed single-chip microcomputer course simulation teaching system; This system chart as shown in Figure 1, single-chip microcomputer course simulation teaching system is made up of teacher computer 101, student machine 102, RS485 communication line 103, communication transfer interface module 104 and functional circuit plate 105.Teacher computer 101 is computers of a teaching usefulness, can be that common desktop computer also can be a notebook computer, and teacher computer 101 links to each other with RS485 communication line 103 through communication transfer interface module 104.Teacher computer 101 has five functions: the firstth, and teach and use; The secondth, software emulation can software emulation functional circuit plate 105; The 3rd is that soft or hard combines emulation; On the successful basis of software emulation, link to each other with RS485 communication line 103 through communication transfer interface module 104 and just can realize the emulation identical with hardware capability, such computer is mixed communication transfer interface module 104 just can replace an above-mentioned real functional circuit plate 105; The 4th is can send Debugging message to functional circuit plate 105 to detect the function with authentication function circuit board 105; The 5th is pure simulation hardware, combines executable code after the artificial debugging success to download in the single-chip microcomputer of true plate soft or hard and just can see real effect.Student machine 102 can be accomplished software emulation, soft or hard and combine emulation and pure simulation hardware, but student machine can not send Debugging message and detect the function with the authentication function circuit board, because the teacher does not provide the communication protocol of this respect.Student machine 102 can be one or multiple computers; If teach in the laboratory; Each student disposes a computer; If do not teach in the laboratory; Student with good conditionsi can carry notebook computer; So, also be to link to each other with RS485 communication line 103 through communication transfer interface module 104 because notebook computer does not have the RS232 serial communication interface also need join the module that a USB changes serial ports.Functional circuit plate 105 can in structural drawing as shown in Figure 1, be an example with a functional circuit plate 105 only for one or polylith.Communication transfer interface module 104 is used for converting the RS232 interface (interfaces of 9 lines) of computer output to RS485 interface (being the interface of 2 lines), so just computer can be linked into the RS485 communication line.Functional circuit plate 105 is connected in RS485 communication line 103 through two lines.Functional circuit plate 105 is made up of single-chip microcomputer 106, RS485 change-over circuit 107, RS485 interface circuit 108, address circuit 109, program download interface 110 and functional module 111.RS485 change-over circuit 107 is used for serial receiving and transmitting signal with single-chip microcomputer 106 and converts the RS485 signal to and link to each other with said RS485 interface circuit 108; Single-chip microcomputer 106 links to each other with RS485 communication line 103 with RS485 interface circuit 108 through RS485 change-over circuit 107; Address circuit 109 links to each other with single-chip microcomputer 106 and realizes the address setting of functional circuit plate 105; Can download to single-chip microcomputer 106 by the executable code that compiling is good through program download interface 110, functional module 111 realizes the function of this functional circuit plate 105 under the control of single-chip microcomputer 106.The instantiation of this functional circuit plate 105 will be described in the embodiment of Fig. 2.Functional circuit plate 105 can download to the executable program code of finishing 106 li of single-chip microcomputers through program download interface 110, so just can realize simulation hardware.Functional circuit plate 105 can carry out software emulation through computer; To adorn the simulation software of Protues 7.5, the C Programming with Pascal Language software of ACCAVR on the computer; AccessPort assistant software and other related software; Each classmate not only can copying circuit board 105 in the classroom like this, the copying circuit board 105 of can also staying at home.After completing successfully, can adopt software emulation soft or hard to combine emulation to come circuit board that is virtually reality like reality.
As shown in Figure 2, Fig. 2 is the structural drawing of another preferred embodiment of single-chip microcomputer course simulation teaching system of the present invention.This system is that we are enterprise design and operation real system for many years; This system accomplishes the purpose of intelligent building inflammable gas monitoring; In order to impart knowledge to students conveniently; We remove the function that only keeps the main circuit plate and do not influence system to shell and unnecessary circuit; These main circuit plates are divided on the dais or on the desktop; Before teaching, can issue everybody to the executable program code of the schematic diagram of circuit board and actual motion, make classmates can closely experience real system through explanation according to the course needs.System is made up of teacher computer 201, student machine 202, RS485 communication line 203, communication transfer interface module 204, monitor board 205, check-out console 206 and interlock plate 207; Real system will connect a lot of check-out consoles 206 and interlock plate 207; In order to impart knowledge to students conveniently, we only connect a check-out console 206 and an interlock plate 207.The function of communication transfer interface module 204 is that the RS232 interface conversion is become the RS485 interface; Teacher computer 201 is computers of a teaching usefulness; Can be that common desktop computer also can be a notebook computer, teacher computer 201 connects with RS485 communication line 203 through communication transfer interface module 204 and links to each other.Teacher computer 201 has five functions: the firstth, and teach and use; The secondth, software emulation can the above-mentioned three blocks of plates of software emulation; The 3rd is that soft or hard combines emulation; On the successful basis of software emulation, connect to link to each other through communication transfer interface module 204 and RS485 communication line 203 and just can realize the emulation identical with hardware capability, such computer is mixed communication transfer interface module 204 just can replace one of above-mentioned real three blocks of plates; The 4th is to send the function that Debugging message detected and verified three blocks of plates to three blocks of plates; The 5th is pure simulation hardware, combines executable code after the artificial debugging success to download in the single-chip microcomputer of true plate soft or hard and just can see real effect.Student machine 202 can only accomplish software emulation and soft or hard combines emulation.Communication transfer interface module 204 is used for converting the RS232 interface (interfaces of 9 lines) of computer output to RS485 interface (being the interface of 2 lines), so just computer can be linked into the RS485 communication line.Monitor board 205, check-out console 206 and interlock plate 207 all are just can connect with RS485 communication line 203 through two lines to link to each other.Detection plate 206 function is to detect the concentration of combustible gas concentration is detected while the value passed through the RS485 communication line 203 monitoring board 205; monitoring board 205 to complete the purpose of real-time monitoring, detection plate 206 can display the concentration information sent over the display clock information display system running, handling keyboard information, if you find a detection plate 206 over the concentration information sent over a low limit on the RS485 communication line 203 via linkage plate 207 to send commands to start the fan, the fan control in the linkage plate 207 start, the smell into the room, if you find a detection plate 206 over the concentration information sent over the high limit through the RS485 communication line 203 to send off valve linkage plate 207 directives and instructions to start the fan, the fan in the linkage plate 207 started under the control valve in the linkage plate 207 under control of the cut, and cut off the gas in the exclusion odor source, to prevent fires and disaster deteriorate further.Three blocks of plates all have the download line, the executable program code of finishing can be downloaded in the single-chip microcomputer of three blocks of plates through downloading line, so just can realize simulation hardware.Three blocks of plates can carry out software emulation through computer; To adorn the simulation software of Protues 7.5, the C Programming with Pascal Language software of ACCAVR on the computer; AccessPort assistant software and other related software; Each classmate not only can these three blocks of plates of emulation in the classroom like this, these the three blocks of plates of emulation of can also staying at home.After completing successfully, can adopt software emulation soft or hard to combine emulation to come circuit board that is virtually reality like reality.We use such single-chip microcomputer course simulation teaching system, adopt item teaching method simultaneously, make classmates grasp single-chip microcomputer technical ability very soon, play good teaching efficiency.
Gas probe 11, signaling conversion circuit 12, single-chip microcomputer 13, RS485 change-over circuit 14, RS485 interface circuit 15, address circuit 16, power module 17, program download interface 18 and pilot lamp 19 are arranged on the check-out console 206.RS485 change-over circuit 14 converts the serial receiving and transmitting signal of single-chip microcomputer 13 to the RS485 signal and links to each other with RS485 interface circuit 15, and single-chip microcomputer 13 links to each other with RS485 communication line 203 with RS485 interface circuit 15 through RS485 change-over circuit 14.Signaling conversion circuit 12 is that the concentration value that the concentration information with gas probe 11 converts 0 to 5 vor signal to is given single-chip microcomputer 13; The model of single-chip microcomputer 13 is MEGA8; Through RS485 change-over circuit 14 and RS485 interface circuit 15 concentration value is passed to monitor board 205; Address circuit 16 adopts toggle switch to link to each other with single-chip microcomputer 13 and realizes the address setting of check-out console 206; Can connect a plurality of check-out consoles in the system, but address setting can not be identical.Power module 17 is to convert direct current 48 vor signals to direct current 5 vor signals, and direct current provides power supply for check-out console 206 for 5 volts, and real system direct current 48 vor signals are from intelligent building, and this analogue system uses 48 volts of stabilized voltage supplys of direct current to be check-out console 206 power supplies.Timing indicator 19 every flickers at a distance from 1 second second on the check-out console 206 represent that once this plate is in proper working order.Can download to single-chip microcomputer 13 by the executable code that compiling is good through program download interface 18.
On the interlock plate 207 valve controling circuit 21, draught fan control circuit 22, single-chip microcomputer 23, RS485 change-over circuit 24, RS485 interface circuit 25, address circuit 26, power module 27, program download interface 28 and pilot lamp 29 are arranged.RS485 change-over circuit 24 converts the serial receiving and transmitting signal of single-chip microcomputer 23 to the RS485 signal and links to each other with RS485 interface circuit 25, and single-chip microcomputer 23 links to each other with RS485 communication line 203 with RS485 interface circuit 25 through RS485 change-over circuit 24.Valve controling circuit 21 is connected in single-chip microcomputer 23, is a control relay circuit, is subjected to single-chip microcomputer 23 controls, the output contact signal.When single-chip microcomputer 23 receives the cutting-off valve instruction, valve controling circuit 21, valve controling circuit 21 cutting-off valves are passed in the cutting-off valve instruction.Draught fan control circuit 22 is connected in single-chip microcomputer 23, also is a control relay circuit, is subjected to single-chip microcomputer 23 controls, the output contact signal.When single-chip microcomputer 23 receives the instruction of said fan starting, draught fan control circuit 22 is passed in the fan starting instruction, the said fan starting of draught fan control circuit 22 controls.The model of single-chip microcomputer 23 is MEGA48, and valve control command and blower fan control command that it receives from monitor board 205 through RS485 change-over circuit 24 and RS485 interface circuit 25 are through analyzing to confirm how to control blower fan and valve.Address circuit 26 adopts toggle switch to link to each other with single-chip microcomputer 23 and realizes the address setting of interlock plate 207.Power module 27 is to convert direct current 48 vor signals to direct current 5 vor signals, and direct current is that interlock plate 207 provides power supply for 5 volts, and real system direct current 48 vor signals are from intelligent building, and it is 207 power supplies of interlock plate that this analogue system is used 48 volts of stabilized voltage supplys of direct current.Pilot lamp 29 on the interlock plate 207 comprises a second timing indicator, blower fan pilot lamp and valve pilot lamp.Timing indicator whenever glimmered at a distance from 1 second and represented that once this plate is in proper working order second.The blower fan pilot lamp of interlock on the plate 207 lighted the expression fan starting and pilot lamp extinguishes the expression blower fan and stops.The valve pilot lamp of interlock on the plate 207 lights that the expression valve cuts off and pilot lamp extinguishes the expression valve and connects.Can download to single-chip microcomputer 23 by the executable code that compiling is good through program download interface 28.
Charactron demonstration 31, status indicator lamp 32, single-chip microcomputer 33, RS485 change-over circuit 34, RS485 interface circuit 35, address circuit 36, power module 37, keyboard circuit 38, clock circuit 39, warning circuit 40 and program download interface 41 are arranged on the monitor board 205.RS485 change-over circuit 34 converts the serial receiving and transmitting signal of single-chip microcomputer 33 to the RS485 signal and links to each other with RS485 interface circuit 35, and single-chip microcomputer 33 links to each other with RS485 communication line 203 with RS485 interface circuit 35 through RS485 change-over circuit 34.The model of single-chip microcomputer 33 is MEGA16; It whenever sends to said check-out console to all check-out consoles 206 at a distance from 50 milliseconds of actives with RS485 interface circuit 35 by RS485 change-over circuit 34 and sends querying command packet (as shown in Figure 6); Comprise address byte and querying command byte in this querying command packet; Check-out console 206 receives this querying command packet and resolves; If the identical concentration information bag (as shown in Figure 6) that includes the concentration byte of just uploading of this address byte in this querying command packet with the setting address of check-out console 206; If the address byte in this querying command packet and the setting address of check-out console 206 are inequality; Then continue to carry out other program; Monitor board 205 will be presented at charactron and show on 31 from the concentration value that check-out console 206 receives; If concentration value surpasses low limit value or ceiling value; Concentration value surpasses the fault message that hangs down limit value or surpass ceiling value and will be presented on charactron demonstration 31 and the said status indicator lamp 32; And be stored in the internal storage of single-chip microcomputer 33; Starting warning circuit 40 notifies the attendant to arrive the in-situ processing fault; Single-chip microcomputer 33 sends interlock command packet (as shown in Figure 7) by RS485 change-over circuit 34 and RS485 interface circuit 35 to interlock plate 207 simultaneously; Comprise address byte, blower fan action byte and valve event byte in this interlock command packet; Interlock plate 207 receives the interlock command packet and resolves; If the identical interlock feedback information bag (as shown in Figure 7) of just uploading of the address byte in the interlock command packet with the setting address of interlock plate 207; And according to the Numerical Control blower fan of blower fan action byte with according to the Numerical Control valve of valve event byte; Comprise the return code byte in this interlock feedback information bag; The value of this return code byte is that 0 expression interlock is normal; Be that 1 expression interlock is unusual; If the address byte in the said interlock command packet is inequality with the setting address of interlock plate 207; Then continue to carry out other program; The feedback information bag that monitor board 205 receives from interlock plate 207; And feedback information is presented at status indicator lamp 32 shows on 31 with charactron, just start said warning circuit at once and notify the maintenance personal to repair interlock plate 207 when feedback information declaration of exception interlock plate 207 breaks down.Link to each other with clock circuit 39 receive clock signal and show on 31 at charactron and to show current date and time of single-chip microcomputer 33.Keyboard circuit 38 is used for setting, modification and the inquiry of information or order, can inquire about date and concentration value and which check-out console 206 detected faults that fault takes place through keyboard.Can download to single-chip microcomputer 33 by the executable code that compiling is good through program download interface 41.Can only connect a monitor board 205 in the system at most.Monitor board 205 also comprises power module 37, and this power module 37 converts direct current 48 vor signals to direct current 5 vor signals, and this direct current provides power supply for monitor board 205 for 5 volts.Address circuit 36 links to each other with single-chip microcomputer 33 and realizes the address setting of monitor board 205
Arrive shown in Figure 5 like Fig. 3; Fig. 3 is the emulation schematic diagram of the check-out console in the single-chip microcomputer course simulation teaching system shown in Figure 2; Fig. 4 is the emulation schematic diagram of the interlock plate in the single-chip microcomputer course simulation teaching system shown in Figure 2, and Fig. 5 is the emulation schematic diagram of the monitor board in the single-chip microcomputer course simulation teaching system shown in Figure 2.The function that the emulation schematic diagram is accomplished and the function of actual functional capability plate are identical; At first the program of finishing is loaded in the single-chip microcomputer of emulation schematic diagram; An executive button is arranged in the emulation interface; In the emulation interface, also have various emulation testing instruments; The emulation testing instrument is connected to the corresponding test position of emulation schematic diagram; Press executive button then and just can see video data and Wave data, so just can see simulated effect, if defective with regard to update routine.
And being monitor board, real system hangs on the wall of Surveillance center; Combustable gas concentration information through RS485 communication network transmission querying command timing data packet is patrolled and examined each kitchen just prevents the condition of a disaster generation or deterioration through communication network to link plate transmission interlock command packet startup blower fan or cutting-off valve if the discovery concentration information exceeds standard.Show the combustable gas concentration information in each kitchen on the monitor board, also will show inflammable gas failure message and linkage status.
A plurality of check-out consoles are installed in each kitchen; Detect combustable gas concentration information; Each check-out console is parallel to the RS485 communication network through the RS485 interface circuit; An interlock of installation plate is used for controlling the action of blower fan and valve in each kitchen, and each interlock plate is parallel to the RS485 communication network through the RS485 interface circuit.
The quantity of the functional circuit plate of the maximum parallel connection of native system is 128.
For to top three firm and hard existing software emulations, we are on computers with the simulation software of Protues 7.5 draw respectively emulation schematic diagram such as Fig. 3, Fig. 4 and shown in Figure 5 of three blocks of plates.We programme with the C Programming with Pascal Language software of ACCAVR and compile; There is not grammar mistake to form executable code later on; Then this executable code is downloaded in the single-chip microcomputer of emulation schematic diagram; The operation simulated program just can be seen the display message of charactron and pilot lamp on the emulation schematic diagram; Just can judge through these display message whether the program of oneself compiling is qualified, if the defective program that remodifies.The function that on the emulation schematic diagram, realizes is identical with real system.
In order to allow the programming skill of students grasp single-chip microcomputer from the superficial to the deep, we become many program modules with total procedure division of three blocks of plates, and total system is finally accomplished in the explanation of module and emulation one by one.
With reference to figure 3, for check-out console, we become four program modules with its procedure division.Module's function is to detect a concentration in digital display, wiper potentiometer RV1 is 0-5 volt variable signal is connected to the microcontroller 22 feet, can be adjusted by clicking the mouse on the RV1 potentiometer wiper, The completion of this module is to enable students to master the analog and digital programming skills; Module 2 function is to allow light-emitting diode flashes once every second, which means that microcontroller is working properly, the completion of this module the students mastered the timer interrupt and glowing LED flashes programming skills; module 3 is the function of reading the DIP switch values and digital tube display, DIP switch for detecting plate also set the communication address by clicking on the mouse you can adjust the value of the DIP switch DSW1, The completion of this module is to enable students to master the digital input and output programming skills; Module 4 function is simulated using RS485 communication function, the figure P1 is the simulation serial communication interface, the actual system is via a serial communication interface to receive monitoring board query command packet, the packet by a plurality of bytes, as shown in Figure 6, the detection plate receives this information packet, after parsing, if the packet address is not in the ignore its own address, if it is their Upload your own address on the address and concentration while doing simulation, when serial debugging assistant software sends the query command packet, if the address information matches the serial debugging assistant software, you can receive the address on the interface and the concentration value, this module is to enable students to master the complete serial communication programming skills.
With reference to figure 4, for the interlock plate, we become three program modules with its procedure division.Module 1 is the function of reading the DIP switch values, DIP switch setting is also a mailing address for the detection plate, by clicking on the mouse you can adjust the DIP switch DSW1 values, this module is to enable students to master the complete digital inputs programming skills; Module 2 function is to allow light-emitting diode flashes once every second, which means that microcontroller is working properly, the completion of this module the students mastered the timer interrupt and LED flash programming skills; Module 3 function is simulated using RS485 communication function, P1 is the serial communication interface simulation, the actual system is monitored via a serial communication interface to receive a command packet of the linkage plate, a plurality of bytes of the packet, shown in Figure 7, the linkage plate receives this message package, parsed, if the address of the packet is not ignored its own address, if it is your own address on the upload confirmation packet contents under both control commands are controlled fan and valve action, the return code of 0 indicates that the linkage plate working properly return code of 1 indicates abnormal linkage plate work, while doing simulation when sending via serial debugging assistant software linkage command packet, if the address information matches the serial debugging assistant software interface can simultaneously receive a confirmation packet based content control commands control two light emitting diodes or off, two light-emitting diodes represent the fans and valves, this module is to enable students to master the complete serial communication and remote control programming skills.
With reference to figure 5, for monitor board, we become four program modules with its procedure division.Module 1 is the function of U2 from the clock chip reads the current date and time value in S1, after four digital tube display, the clock chip model is DS1302, the completion of this module the students mastered reading from the current date clock chip U2 and the time value of programming skills; Module 2 function is to allow light-emitting diode D9 flashes once every second, which means that microcontroller is working properly, the completion of this module the students mastered the timer interrupt and LED flash programming skills; module 3 function is to read the keyboard values can be adjusted by clicking the mouse on the keyboard's numeric value, keyboard circuit for information or commands to set, modify, and query, this module is to enable students to master the complete keyboard input programming skills; Module 4 is the function Simulation RS485 communication function, is the most comprehensive system functions, the figure P1 is a simulation serial communication interface, the actual system is via a serial communications interface board sends the query command to detect packet, the packet by a number of bytes , shown in Figure 6, the detection plate receives this information packet, after parsing, if the packet address is not in the ignore its own address, if it is the address of the upload their own address and concentration value, and the monitoring board S1's front four digital tube display, the concentration overrun error message appears in the status indicator on the D1 or D2, but also stored in the microcontroller's internal memory, the same time start the alarm circuit LS1 notify maintenance personnel to get to the scene to deal with failure, if the concentration gauge malfunction occurs while also sending to the linkage plate fan and valve control command prompt suppression of fires.Can inquire about date and concentration value and the detected fault of which check-out console that fault takes place through keyboard, interlock plate feedack shows on preceding four of charactron S2.And do monitor board simulation communication experiment time; At first manually send querying command and interlock order through keyboard; On the interface of AccessPort assistant software, should see these orders; Illustrate that manual control function is normal; The method that preferably adopts soft or hard to combine under the automatic condition; Through connecting communication transfer interface module computer is linked in the RS485 communication line, the completion of this module makes the student grasp the art of programming and the comprehensive analytical capacity of serial communication.
Use the thinking of native system to be: software emulation before this, soft or hard combines emulation again, at last simulation hardware again; When carrying out software emulation; Allow the programming skill of students grasp single-chip microcomputer from the superficial to the deep; We become many program modules with total procedure division of three blocks of plates; The explanation of module and emulation one by one; The final total system of accomplishing, the student has grasped single-chip microcomputer technical ability very soon and has reached simultaneously good teaching efficiency again.
Those skilled in the art are understood that after having read this instructions; The device that single-chip microcomputer course simulation teaching system of the present invention is realized the RS485 communication is combined by prior art and constitutes; Though these prior aries are not all described on all matters, big and small ground one by one, those skilled in the art can know its cloud after having read this instructions.Describe the combination of above-mentioned prior art in this instructions and constituted each scheme of the present invention; It will be appreciated by those skilled in the art that; The various combinations of these schemes, and the combination that constitutes various piece and/or the characteristic of these schemes all belongs to the category of scheme of the present invention.Those skilled in the art obviously are understandable that, above-mentioned prior art is combined formation the present invention, and this needs a large amount of creative works to pay, and are the crystallizations of theoretical research for many years and a large amount of experiments.
Claims (10)
1. single-chip microcomputer course simulation teaching system; It comprises at least one block of functional circuit plate; This functional circuit plate comprises single-chip microcomputer; And under the control of this single-chip microcomputer, realize the function of this functional circuit plate; It is characterized in that; This single-chip microcomputer course simulation teaching system also comprises teacher computer; Student machine; RS485 communication line and communication transfer interface module; This teacher computer is the computer of a teaching usefulness; And executive software emulation; Software and hardware emulation and pure simulation hardware; Said student machine is one or multiple computers; Executive software emulation and soft or hard combine emulation; Said communication transfer interface module is connected in said teacher computer and said student machine; The RS232 interface conversion is become the RS485 interface, and link to each other with said functional circuit plate through said RS485 communication line.
2. system according to claim 1; It is characterized in that; Said teacher computer links to each other through said communication transfer interface module and said RS485 communication line on the successful basis of said software emulation and realizes the said software and hardware emulation identical with said functional circuit plate; Said teacher computer sends the function that Debugging message detected and verified said functional circuit plate to said functional circuit plate, and said pure simulation hardware is carried out for the executable code after combining artificial debugging successful said soft or hard downloads in the said single-chip microcomputer from said teacher computer.
3. system according to claim 1; It is characterized in that; Said functional circuit plate also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit; Functional module and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said functional circuit plate; Said functional module realizes the function of said functional circuit plate under the control of said single-chip microcomputer, said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
4. system according to claim 1; It is characterized in that; Said functional circuit plate is a monitor board, at least one check-out console and at least one block of interlock plate; This check-out console detects the concentration of fuel gas and detected concentration value is passed to said monitor board by said RS485 communication line; Said monitor board executive real-time monitoring; And show that said check-out console passes the said concentration value of coming; Read clock information; The display system running status; Handle keypad information; And when finding that said concentration value that said check-out console sends surpasses low limit value; Said monitor board sends to said interlock plate by said RS485 communication line and starts the blower fan instruction; Blower fan starts under the control of said interlock plate; When finding that said concentration value that said check-out console sends surpasses ceiling value; Said monitor board sends the cutting-off valve instruction and starts the blower fan instruction to said interlock plate by said RS485 communication line, and said blower fan starts under the control of said interlock plate, and valve cuts off under the control of said interlock plate.
5. system according to claim 4; It is characterized in that; Said check-out console also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said check-out console, and said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
6. according to claim 4 or 5 described systems; It is characterized in that; Said check-out console also comprises gas probe and signaling conversion circuit; This signaling conversion circuit sends the said concentration value that the concentration information of this gas probe converts 0 to 5 vor signal to said single-chip microcomputer, and said single-chip microcomputer passes to said monitor board through said RS485 change-over circuit and said RS485 interface circuit with said concentration value.
7. according to claim 4 or 5 described systems; It is characterized in that; Said check-out console also comprises decides power module and second pilot lamp; This power module converts direct current 48 vor signals to direct current 5 vor signals; This direct current provides power supply for said check-out console for 5 volts, and said second timing indicator whenever glimmers at a distance from 1 second and represent that once said check-out console is in proper working order.
8. system according to claim 4; It is characterized in that; Said interlock plate also comprises the RS485 change-over circuit; The RS485 interface circuit; Address circuit and program download interface; Said RS485 change-over circuit converts the serial receiving and transmitting signal of said single-chip microcomputer to the RS485 signal and links to each other with said RS485 interface circuit; Said single-chip microcomputer links to each other with said RS485 communication line with said RS485 interface circuit through said RS485 change-over circuit; Said address circuit links to each other with said single-chip microcomputer and realizes the address setting of said interlock plate, and said program download interface is to compile the interface that good executable code downloads to said single-chip microcomputer.
9. according to claim 4 or 8 described systems; It is characterized in that; Said interlock plate also comprises valve controling circuit and draught fan control circuit; This valve controling circuit is connected in said single-chip microcomputer with this draught fan control circuit; When said this single-chip microcomputer receives the instruction of said fan starting; Said draught fan control circuit is passed in said fan starting instruction; Said draught fan control circuit is controlled said fan starting; When said single-chip microcomputer receives the instruction of said cutting-off valve; Said valve controling circuit is passed in said cutting-off valve instruction, and said valve controling circuit cuts off said valve.
10. according to claim 4 or 8 described systems; It is characterized in that; Said interlock plate also comprises power module; Decide pilot lamp second; Blower fan pilot lamp and valve pilot lamp; This power module converts direct current 48 vor signals to direct current 5 vor signals; This direct current provides power supply for said interlock plate for 5 volts; Said second timing indicator whenever glimmers at a distance from 1 second and representes that once said interlock plate is in proper working order; Said blower fan pilot lamp is lighted expression said fan starting and pilot lamp and is extinguished the said blower fan of expression and stop, and described valve pilot lamp lights that the said valve of expression cuts off and pilot lamp extinguishes the said valve of expression and connects.
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