CN204791711U

CN204791711U - Multi -functional instruments used for education based on FPGA

Info

Publication number: CN204791711U
Application number: CN201520407623.0U
Authority: CN
Inventors: 杨洁
Original assignee: Anhui Normal University
Current assignee: Anhui Normal University
Priority date: 2015-06-12
Filing date: 2015-06-12
Publication date: 2015-11-18
Anticipated expiration: 2025-06-12

Abstract

The utility model discloses a multi -functional instruments used for education based on FPGA, its characterized in that: instruments used for education include that FPGA processor module connects signal processing module and liquid crystal display respectively, FPGA processor module links through the AVALON bus simultaneously has the flash memory, SDRAM memory, VGA interface module, USB interface module, operating panel module, SD card interface module. Since the above structure is adopted, the utility model discloses an advantage provides an appurtenance for the data signal of colleges and universities handles with the teaching of electronic circuit, and wherein classical fourier changes, the digital filter design, and heavy difficult point contents such as the modem of signal are in images through this appurtenance, specialize, make the student more deep to the content of courses, and the help teacher promotes teaching effects. The utility model relates to an it is small and exquisite, convenient to use, the cost is lower, has fine market prospect.

Description

A kind of multifunction teaching instrument based on FPGA

Technical field

The utility model relates to the technological improvement of instruments used for education, particularly a kind of multifunction teaching instrument based on FPGA.

Background technology

Fourier transform, digital filter design, the modulation and demodulation of signal occupies consequence, the important content of Ye Shi colleges and universities relevant speciality teaching simultaneously in Telecommunication Subject and correlation engineering application.

Current teacher mainly still depends on bookish illustration and formula when teaching related content, and the teacher being good at programming may use the Software tools such as MATLAB to realize the design sketch of above-mentioned conversion.But the process of above-mentioned conversion understood by the bookish illustration after all limited student of being unfavorable for, although the softwares such as MATLAB are powerful, the realization of often kind of function all will be revised corresponding program and could perform, operation more complicated, is unfavorable for that teaching is promoted.

For the problems referred to above, provide a kind of special instruments used for education, by Fourier transform, the effect of digital filter design and signal madulation and demodulation intuitively shows.

Utility model content

Technical problem to be solved in the utility model is, provides a kind of multifunction teaching instrument based on FPGA, and to reach Fourier transform, the effect of digital filter design and signal madulation and demodulation carries out the object intuitively shown.

For achieving the above object, the technical solution of the utility model is, a kind of multifunction teaching instrument based on FPGA, is characterized in that: described instruments used for education comprise FPGA processor module connection signal processing module and LCDs respectively; FPGA processor module is connected with flash storage, SDRAM storer, USB interface module, usb interface module, guidance panel module, SD card interface module by AVALON bus simultaneously.

It is that whole system is powered that described instruments used for education are provided with system power supply module.

In described instruments used for education, the circuit of each module is arranged in instrument box, and instrument box is provided with Liang Ge guidance panel district, for installing button and the knob of guidance panel module; Instrument box is connected with LCDs simultaneously; Instrument box is connected with signal transacting panel, for installing the knob that signal processing module circuit amplitude regulates; Synchronous signal process panel is connected with signal output terminal and signal input terminal; Oscillograph output terminal, oscillograph input end is connected with, the signal output part of its difference connection signal processing module and input end on the right side of instrument box.

Described instrument box dead ahead is connected with SD card interface and power switch.

USB interface, USB interface is connected with on the left of described instrument box.

Described LCDs and instrument box, for being flexibly connected, cover instrument box not used time LCDs is closed.

In described FPGA processor module, fpga chip adopts the CycloneIV family chip EP4CE10F17C8N of ALTERA company.

Digital signal is converted the signal received to simulating signal by signal input port, attenuator circuit access high speed D/A chip by described signal processing module, and signal shows finally by liquid crystal display by being exported by signal output port after Butterworth LPF and modulation circuit process.

A kind of multifunction teaching instrument based on FPGA, owing to adopting above-mentioned structure, the digital signal processing that advantage of the present utility model is colleges and universities and the teaching of electronic circuit provide a kind of aid, by wherein classical Fourier's series, digital filter design, the heavy difficult point content such as the modulation /demodulation of signal, by this aid imagery, is specialized, make student more deep to the content of courses, help teacher promotion's teaching efficiency.The utility model design is small and exquisite, easy to use, and cost is lower, has good market outlook.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail;

Fig. 1 is a kind of multifunction teaching apparatus structure block diagram based on FPGA of the utility model;

Fig. 2 is a kind of multifunction teaching apparatus structure schematic diagram based on FPGA of the utility model;

Fig. 3 is the side structure schematic diagram of a kind of multifunction teaching instrument based on FPGA of the utility model;

Fig. 4 is a kind of schematic diagram based on signal processing module in the multifunction teaching instrument of FPGA of the utility model;

In fig. 1-3,1, FPGA processor module; 2, LCDs; 3, signal processing module; 4, guidance panel module; 5, flash storage; 6, SDRAM storer; 7, system power supply module; 8, USB interface module; 9, usb interface module; 10, SD card interface module; 11, instrument box; 12, operating surface version district; 13, signal transacting panel; 14, signal output terminal; 15, signal input terminal; 16, oscillograph output terminal; 17, oscillograph input end; 18, SD card interface; 19, USB interface; 20, power switch; 21, USB interface.

Embodiment

The utility model connects the method for projector display by Fourier transform mainly through USB interface 12, and the effect of digital filter design and signal madulation and demodulation is presented on projecting apparatus screen.Its maximum feature is the dynamic effect picture display achieving above-mentioned functions, user can easily by external input or built-in interface input mode input source data or parameter, the design sketch of output terminal or function can show at once, and this is that the softwares such as MATLAB cannot realize.The utility model also has subsidiary function except may be used for the teaching demonstration on classroom, which provide and make signal driving source and oscillographic function, user is not having, in function signal generator and oscillographic situation, can use this instrument to replace, convenient and cost is low.

Specifically as shown in Figure 1, the utility model comprises FPGA processor module 1, LCDs 2, signal processing module 3, power module 7, described FPGA processor module 1 is connected with flash storage 5 by AVALON bus, SDRAM storer 6, USB interface module 8, usb interface module 9, guidance panel module 4, SD card interface module 10, described power module 7 is used for powering to whole system, described LCDs 2 is connected with FPGA processor module 1, be used as the display panel of system, described signal processing module 3 is connected the digital-to-analogue for realizing signal with FPGA processor module 1, analog to digital conversion.

As Figure 2-3, instrument box 11 is for placing the circuit of fpga core plate and above-mentioned each module, and its shell adopts shielding material to make, and can play shielding action to interference noise for structural representation of the present utility model; Described instrument box 11 leaves Liang Ge guidance panel district 12, for installing button and the knob of guidance panel module 4; Described instrument box 11 is connected with LCDs 2, and described LCDs 2 can be able to be opened with closed as note-book computer display screen; Described instrument box 11 is connected with signal transacting panel 13, for installing the knob that in signal processing module 3, circuit amplitude regulates; Signal transacting panel 13 is connected with signal output terminal 14, signal input terminal 15, exports for signal and open up interface with the outer of input; Be connected with oscillograph output terminal 16 on the right side of described instrument box 11, oscillograph input end 17, the signal output part of connection signal processing module 3 and input end, object is to match with oscillograph interface; Described instrument box 11 dead ahead is connected with SD card interface 18 with power switch 20, SD card interface 18 for installing SD card, and power switch 20 controls the open and close of whole system; Be connected with USB interface 21, usb 19 on the left of described instrument box 11, USB interface 21 shows wanting the content shown in order to drive projector on projecting apparatus screen, and usb 19 is in order to connect computor-keyboard as the interface extending out input operation order.

The utility model mainly contains three kinds of functions of demonstration Fourier transform, digital filter functions, signal madulation and demodulating process, and purposes is mainly classroom instruction demonstration.

When making teaching demonstration purposes: by guidance panel model choice teaching demonstration display mode, now LCDs is operational order and optimum configurations display screen, only the state of display residing for current system and input data, guidance panel is provided with and realizes button corresponding to above-mentioned three kinds of functional modes, system only chooses a kind of functional mode chosen recently to carry out work, after entered function pattern, display screen demonstrates the subfunction of the corresponding function that system can provide, after such as selecting Fourier transform function, display screen can demonstrate the subfunction of DFT (discrete Fourier transform (DFT)) and FFT (fast fourier transform), with this analogy, then enter the setting of source data or parameters input, system provides two kinds of external datas or parameters input mode, the mode of a kind of onboard data or parameters input, can select one of three kinds of input patterns by guidance panel, two kinds of modes of external data or parameters input are for input by USB external connection keyboard and to be read in from SD card onboard data by SD card interface 18, keyboard enters data into buffer memory in FPGA internal RAM according to the command format of system, FPGA reads data again and processes from RAM, user equally also will write data according to certain file edit form at use SD card as during input mode, and then data buffer storage gives FPGA process again to RAM, namely the mode of onboard data or parameters input is selected to deposit data in systems in which or parameter in advance by guidance panel, source data choose or optimum configurations well after, result after data processing drives projector to show by VGA by FPGA, such as, the source data conversion of result after demonstrating to(for) Fourier transform is also shown by the mode of coordinate diagram, the waveform of signal by it can be shown for digital filter, because FPGA realizes design of filter by the mode of hardware, its result being different from Software for Design is an actual wave filter, equally can by the signal of selected modulation according to the parameter inputted by the Signal aspects after modulation out for the modulation and demodulation of signal, in order to realize Dynamic Announce effect, user can be modified to the numerical value of source data or parameter in real time by guidance panel, FPGA processes data after receiving amendment order immediately again, and then show, because the processing speed of FPGA is quite fast, so delay effect can be ignored, the effect after such as can observing modulation to the amplitude of input signal and frequency adjustment when carrying out the modulation of signal.In addition, the utility model also provides signal driving source and oscillographic subsidiary function, can use whenever necessary with it as experiment equipment.

When doing auxiliary energy supply: now should close teaching demonstration pattern by guidance panel, open subsidiary function pattern, now VGA display is closed, liquid crystal display is used for showing the waveform of measured signal and the current state of parameter and system command, and now can only come input command and parameter by guidance panel; As providing main triangular wave, square wave, sine wave signal during signal driving source, set of frequency can be realized by guidance panel, and FPGA receives parameter rear drive signal processing module that guidance panel imports into carry out process and export corresponding waveform; During as oscillograph, signal carries out being input in FPGA after analog to digital conversion through signal processing module, and FPGA carries out process to data and drives liquid crystal display to show.

In the utility model the composition of modules and principle as follows:

1, system power supply module 7: system power supply module 7 is made up of rechargeable battery and bleeder circuit, rechargeable battery adopts 12V rated voltage rechargeable battery, and 12V supply voltage is that 3.3V voltage is powered to modules by ASM1117-3.3 voltage stabilizing chip dividing potential drop by bleeder circuit.

2, FPGA processor module 1:FPGA chip adopts the CycloneIV family chip EP4CE10F17C8N of ALTERA company, and its speed class is 8, and internal RAM is 423936bits.FPGA processor module is the control core of whole system, and by NiosII processor embedded in FPGA as top layer, veriloghdl hardware description language reaches the requirement of system as the method for bottom.In system, flash storage, SDRAM storer, USB interface module, usb interface module, guidance panel module, SD card interface module are communicated with FPGA by the form hung in AVALON bus, can utilize simultaneously the embedded DSP module of FPGA to complete digital signal fast processing and utilize the IP kernel of existing various Fourier transform and digital filter design greatly to reduce code write the time that difficulty puts goods on the market with quickening product.

3, LCDs 2: liquid crystal display adopts driver to be the color screen of ILI9341, and ILI9341 is a kind of driver based on SPI interface, simple to operation.

4, signal processing module 3: as shown in Figure 4, it has been mainly used to digital-to-analogue, analog to digital conversion to the schematic diagram of signal processing module 3.High speed D/A chip adopts DA9708, FPGA to convert digital signal to simulating signal by driving DA9708, and signal is exported by signal output port after modulation circuit process by Butterworth LPF; High-speed AD chip adopts AD9208, external analog signal is received by high-speed AD chip after attenuator circuit by signal input port collection, FPGA drives AD9208 constantly to gather the analog to digital conversion of external signal settling signal, and processes the data gathered and shown by liquid crystal display.

5, SDRAM storer 6:SDRAM adopts H57V2562GTR chip, the SDRAM storer problem solving fpga chip memory space inadequate, because the design uses NiosII processor cores, for the logical resource reducing FPGA uses, use the mode of external SDRAM storer, SDRAM also can as buffer simultaneously, and the data of collection first can leave in SDRAM and from SDRAM, read data by FPGA again.

6, flash storage 5:Flash storer adopts NorFlashS29GL128P chip, and its storage can reach 128MBit, and Flash is mainly used to the data needed for storage program and system initialization, can prevent the generation of system power failure loss of data phenomenon like this.

7, guidance panel module 4: guidance panel module forms primarily of various button and knob, the operation of the button on guidance panel and knob can be detected by FPGA processor module, FPGA thus this is made to corresponding process.

8, SD card interface module 10:SD interface module adopts the most frequently used TF deck, and interface adopts SPI interface modes.

9, usb interface module 9:USB interface module adopts USB2.0 interface chip CY7C68013A, and USB interface is mainly used in the input that external connection keyboard carries out data.

10, USB interface module 8:VGA driving chip adopts ADV7123 chip, ADV7123 is a kind of three tunnels high speeds, 10 video AD converter inputted that AD company of the U.S. produces, there is the maximum sampling rate of 330MHz, can be compatible with multiple high-precision display.VGA needs to be connected to the content that projector or other USB interface display could will be demonstrated and shows.

By reference to the accompanying drawings the utility model is exemplarily described above; obvious the utility model specific implementation is not subject to the restrictions described above; as long as have employed the various improvement that technical solutions of the utility model are carried out; or directly apply to other occasion, all within protection domain of the present utility model without improving.

Claims

1. based on a multifunction teaching instrument of FPGA, it is characterized in that: described instruments used for education comprise FPGA processor module (1) connection signal processing module (3) and LCDs (2) respectively; FPGA processor module (1) is connected with flash storage (5), SDRAM storer (6), USB interface module (8), usb interface module (9), guidance panel module (4), SD card interface module (10) by AVALON bus simultaneously.

2. a kind of multifunction teaching instrument based on FPGA according to claim 1, is characterized in that: described instruments used for education are provided with system power supply module (7) for whole system and power.

3. a kind of multifunction teaching instrument based on FPGA according to claim 1, it is characterized in that: in described instruments used for education, the circuit of each module arranges with in instrument box (11), instrument box (11) is provided with Liang Ge guidance panel district (12), for installing button and the knob of guidance panel module (4); Instrument box (11) is connected with LCDs (2) simultaneously; Instrument box (11) is connected with signal transacting panel (13), for installing the circuit amplitude adjusting knob of signal processing module (3); Synchronous signal process panel (13) is connected with signal output terminal (14) and signal input terminal (15); Instrument box (11) right side is connected with oscillograph output terminal (16), oscillograph input end (17) distinguishes connection signal processing module (3) signal output part and input end.

4. a kind of multifunction teaching instrument based on FPGA according to claim 3, is characterized in that: described instrument box (11) dead ahead is connected with SD card interface (18) and power switch (20).

5. a kind of multifunction teaching instrument based on FPGA according to claim 3, is characterized in that: described instrument box (11) left side is connected with USB interface (21), USB interface (19).

6. a kind of multifunction teaching instrument based on FPGA according to claim 3, it is characterized in that: described LCDs (2) and instrument box (11), for being flexibly connected, cover instrument box (11) not used time LCDs (2) is closed.

7. a kind of multifunction teaching instrument based on FPGA according to claim 1, is characterized in that: in described FPGA processor module (1), fpga chip adopts the CycloneIV family chip EP4CE10F17C8N of ALTERA company.

8. a kind of multifunction teaching instrument based on FPGA according to claim 1, it is characterized in that: digital signal is converted the signal received to simulating signal by signal input port, attenuator circuit access high speed D/A chip by described signal processing module (3), and signal shows finally by liquid crystal display (2) by being exported by signal output port after Butterworth LPF and modulation circuit process.