CN105679217A - AUX signal testing system and method - Google Patents
AUX signal testing system and method Download PDFInfo
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- CN105679217A CN105679217A CN201610011870.8A CN201610011870A CN105679217A CN 105679217 A CN105679217 A CN 105679217A CN 201610011870 A CN201610011870 A CN 201610011870A CN 105679217 A CN105679217 A CN 105679217A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The invention discloses an AUX signal testing system and a method. The system comprises a signal receiving unit, a signal acquisition unit and a signal transmission unit, wherein the three units are sequentially connected. The signal receiving unit is used for eliminating the clutter of a detected signal and amplifying the detected signal. The signal acquisition unit is used for conducting the differential-to-single-ended treatment on the processed signal and then sampling the single-ended signal according to a superstratum-set sampling frequency until sampled data reach a preset sampling depth. The signal transmission unit is used for sending the sampled data to an external host computer. The host computer conducts the waveform drawing and the data analysis according to the received sampled data. The AUX signal testing method is conducted based on the above device. According to the method, data are sampled according to a preset sampling frequency and signals meeting a triggering condition are triggered to be distributed to a signal storage unit till meeting the preset sampling depth. Meanwhile, an external PC extracts data stored in the signal storage unit to conduct the waveform drawing and the data analysis on the data. After that, analyzed data are reduced to a signal waveform at another place. Therefore, the system and the method are high in efficiency and are applicable to the working mode of the collaborative test development at two places.
Description
Technical field
The invention belongs to signal processing technology field, more particularly, to a kind of AUX signal test system and method.
Background technology
Current DP (DisplayPort, a kind of high-definition digital display interface standard) to put screen technology very ripe, need to use AUX signal (auxiliary channel signal) during DP point screen and carry out communication, and the success or not of communication is directly connected to a screen success; AUX signal can be additionally used in extending display identification data (ExtendedDisplayIdentificationData, EDID) read-write, and AUX signal whether communication normal relation is to the EDID correctness read and write.
When the value that DP screen can not normally be lighted or EDID reads and writes does not correspond with actual value, it is necessary to AUX signal is tested with trouble-shooting reason; Traditional method is to adopt oscillograph that AUX signal is carried out manual testing, there is following defect:
(1) carry out signal testing with oscillograph, it is necessary to tester manually arranges oscillograph, manually catch echo signal;
(2) need after testing out normal signal to access oscillogram one by one, when data volume is big, it is necessary to store substantial amounts of waveform picture;
(3) for the waveform picture of storage, it is necessary to according to AUX agreement, AUX signal is manually decoded, compare with actual value after converting hexadecimal numerical value to, owing to data volume is very big, artificial decoding efficiency is low, and easily makes mistakes.
Summary of the invention
For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of AUX signal test system and method, its object is to realize AUX signal testing, decoding and decoding data exporting integration, improve AUX signal testing efficiency.
For realizing the object of the invention, according to one aspect of the present invention, it is provided that a kind of AUX signal test system, including signal receiving unit, signal gathering unit and signal transmission unit;
Wherein, signal receiving unit is connected with test probe, to probe detection to signal carry out eliminating clutter and processing and amplifying;
Signal after above-mentioned process is carried out difference and turns single-ended process by signal gathering unit, and this single-ended signal is sampled by the sample frequency arranged according to upper strata, stops sampling after sampled data reaches the sampling depth arranged;
Signal transmission unit has host computer interface, and above-mentioned sampling data transmitting is delivered to outside host computer, and host computer draws waveform according to the sampled data received, and carries out data parsing.
Preferably, above-mentioned AUX signal test system, its signal receiving unit includes BNC connector and signal processing circuit; It is connected with test probe by BNC connector;
Its signal processing circuit includes common-mode voltage and produces circuit and signal amplification circuit; Wherein, common-mode voltage produces circuit and provides reference voltage for the input in the same direction for signal amplification circuit;
Wherein, input signal is amplified processing by signal amplification circuit, and by providing the clutter that the method for the common-mode voltage with difference carries out eliminating idle periods to process for differential signal P end and N end; Wherein, the difference of common-mode voltage is at about 0.1V.
Preferably, above-mentioned AUX signal test system, its signal gathering unit includes the configuration module, data acquisition module, signal trigger module and the signal memory module that are integrated on a PLD;
Wherein, configuration module is used for obtaining upper-layer configured data, including sample frequency, sampling depth, trigger signal source and signal type;
The signal that signal processing unit is exported by data acquisition module carries out difference and turns single-ended process, according to sample frequency and sampling depth, this single-ended signal is sampled, and according to trigger signal source, sampled signal is assigned to signal trigger module;
Signal trigger module is for being sent to signal memory module after the sampled signal meeting trigger condition being triggered;
Host computer obtains data from signal memory module and carries out waveform drawing and data parsing.
Preferably, above-mentioned AUX signal test system, its signal gathering unit also includes FIFO buffer memory, and FIFO buffer memory is also integrated on above-mentioned PLD; Signal memory module connects signal trigger module by FIFO buffer memory; FIFO buffer memory, for being sent to signal memory module after the signal buffer memory of signal trigger module output, plays the cross clock domain transmitting effect of data.
Preferably, above-mentioned AUX signal test system, its signal gathering unit also includes DDR, DDR and is also integrated on above-mentioned PLD; Host computer connects signal memory module by DDR.
For realizing the object of the invention, according to another aspect of the present invention, it is provided that a kind of AUX signal testing method, specific as follows:
(1) upper-layer configured order is obtained, and according to configuration order configuration signal acquisition module; Wherein, upper-layer configured order includes sample frequency, sampling depth, trigger signal source and signal type;
(2) according to trigger signal source, the signal to be triggered collected is assigned to signal trigger module;
(3) detection meets the signal to be triggered of trigger condition, is assigned to signal memory cell after being triggered;
(4) above-mentioned signal is stored in DDR by signal memory cell;
(5) from DDR, extract data, carry out waveform reduction and data parsing;
(6) derive resolving the data obtained, adopt binary system or hex file storage.
Preferably, above-mentioned AUX signal testing method, the data of derivation can be reduced into signal waveform in strange land.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it is possible to obtain following beneficial effect:
(1) AUX signal test system provided by the invention, has sample frequency adjustable, the feature that sampling depth can be arranged;
(2) AUX signal testing method provided by the invention and system, can synchronously decode in testing and the data that test decoding obtains be derived, draw waveform and carry out data parsing under the auxiliary of outside host computer;Its real-time decoding function, can greatly improve testing efficiency;
(3) AUX signal testing method provided by the invention and system, it is possible to the data that test decoding obtains are derived and store, forms text; By the text of storage is reduced into waveform, it is achieved local test; Also text can be reduced into waveform in strange land, it is adaptable to the mode of operation of two places cooperation test development;
(4) AUX signal test system provided by the invention, has host computer interface; In the application, directly can be connected with host computer, utilize host computer auxiliary to carry out Interface Control, easy to operate; Have only to measured signal is accessed probe, be then configured upper strata testing, easy and simple to handle, reduce difficulty of test.
Accompanying drawing explanation
Fig. 1 is the system block diagram that the AUX signal test system that embodiment provides is applied to test;
Fig. 2 is signals collecting schematic flow sheet in the AUX signal testing method that embodiment provides;
Fig. 3 is the P end signal amplifying circuit in embodiment;
Fig. 4 is the N end signal amplifying circuit in embodiment;
The common-mode voltage that Fig. 5 is embodiment produces circuit;
Fig. 6 is the application schematic diagram of the AUX signal test system that embodiment provides;
Fig. 7 is the application schematic diagram of the AUX signal test system waveform strange land reduction that embodiment provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention. As long as just can be mutually combined additionally, technical characteristic involved in each embodiment of invention described below does not constitute conflict each other.
The AUX signal test system that embodiment provides includes the signal receiving unit, signal gathering unit and the signal transmission unit that are sequentially connected with; It is applied to test system block diagram as shown in Figure 1.
Signal receiving unit is connected with DP module to be measured by test probe, to probe detection to signal carry out elimination clutter and processing and amplifying; Signal after processing is carried out difference and turns single-ended process by signal gathering unit, and this single-ended signal is sampled by the sample frequency arranged according to upper strata, stops sampling after sampled data reaches the sampling depth arranged; Sampling data transmitting is delivered to host computer by signal transmission unit, and host computer draws waveform according to the sampled data received, and carries out data parsing, preserves resolving the data obtained with binary system or hexadecimal format;
In embodiment, signal gathering unit includes the configuration module, data acquisition module, signal trigger module, FIFO buffer memory and the signal memory module that are integrated on a PLD.
Specifically describing AUX signal testing method provided by the invention below in conjunction with embodiment, adopt the AUX signal test system that embodiment provides, the method carrying out AUX signal testing is specific as follows:
(1) upper-layer configured order is obtained, and according to configuration order configuration signal acquisition module; In embodiment, upper-layer configured order includes signal type, number of channels, sample frequency, sampling depth, triggering signal and burst types;
(2) according to trigger signal source, the signal to be triggered collected is assigned to signal trigger module;
(3) detection meets the signal to be triggered of trigger condition, is assigned to signal memory cell after being triggered;
(4) above-mentioned signal is stored in DDR by signal memory cell;
(5) host computer extracts data from DDR, carries out waveform reduction and data parsing;
(6) derive resolving the data obtained, adopt binary system or hex file storage.
In the present embodiment, in step (5), continue to extract data from DDR, until the data received reach the sampling depth arranged; The waveform that reduction is generated and the hex file resolving acquisition, adopt GUI graphical interfaces to show.
In the present embodiment, for the file obtained in step (6), it is possible to strange land imports host computer and enters to resolve, need to be arranged to consistent by local parameter with the transformation of ownership parameter importing file before parsing; Resolve the waveform of reducible detectable signal.
In the present embodiment, the flow process of signals collecting is as in figure 2 it is shown, specific as follows:
(1) obtain, by Ethernet interface, the configuration order that upper strata issues, and according to configuration order configuration signal acquisition module;
(2) configuration module obtains the configuration data on upper strata, is synchronously performed data acquisition;
(3) trigger signal source according to configuration module configuration, is assigned to signal trigger module by signal to be triggered;
(4) met the signal to be triggered of trigger condition by the detection of signal trigger module, and be assigned to signal memory cell through FIFO buffer memory after being triggered; In embodiment, the condition that AUX signal triggers is Manchester-II coding;
(5) signal collected is stored in DDR by signal memory cell.
The AUX signal test system that embodiment provides, the signal processing circuit of its signal receiving unit includes signal amplification circuit and common-mode voltage produces circuit; Its P end signal amplifying circuit as it is shown on figure 3, N end signal amplifying circuit as shown in Figure 4, common-mode voltage produce circuit as shown in Figure 5; In figure, R5=10R6, so that the common-mode voltage of P end signal and N end signal exists pressure reduction, eliminate the noise signal in signal idle periods;
Owing to the echo amplitude of DP screen is little, and common-mode voltage has pressure reduction, therefore when selecting resistance, makes R3=R4=2R1=2R2, reaches signal carries out 2 times of purposes amplified, thus ensure that the output correctness to the signal of signal gathering unit;
In embodiment, common-mode voltage produces circuit provides the reference voltage V_REF of 1.25V to the input in the same direction of amplifier, and in Fig. 5, the resistance meeting source resistance R7 is identical with the resistance of earth resistance R8.
Adopting the AUX signal test system that embodiment provides to carry out the application of AUX signal testing as schematically shown in Figure 6, one group of AUX signal of signal generator PG output is sent to module to be measured, by probe, this group AUX signal is sent to AUX signal test system simultaneously; Host computer coordinates AUX signal test system, the signal tested is resolved and waveform shows.
Fig. 7 is the application schematic diagram of the AUX signal test system waveform strange land reduction that embodiment provides, and in this application, host computer coordinates AUX signal test system, the signal tested is resolved and waveform shows; Meanwhile, deriving resolving the file obtained, be transferred to strange land by network, strange land host computer goes out signal waveform by the file access pattern received; The mode of operation that this application is two places cooperation test development is provided convenience.
Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (7)
1. an AUX signal test system, it is characterised in that include the signal receiving unit, signal gathering unit and the signal transmission unit that are sequentially connected with;
Described signal receiving unit is connected with external testing probe, for carrying out detectable signal eliminating clutter and processing and amplifying;
Described signal gathering unit turns single-ended process for the signal of signal receiving unit output carries out difference, and described single-ended signal is sampled by the sample frequency arranged according to upper strata, until sampled data reaches the sampling depth arranged;
Described sampling data transmitting is delivered to host computer by described signal transmission unit, and host computer carries out waveform drawing and data parsing according to the sampled data received.
2. AUX signal test system as claimed in claim 1, it is characterised in that described signal receiving unit includes signal processing circuit, described signal processing circuit includes common-mode voltage and produces circuit and signal amplification circuit;
Described common-mode voltage produces circuit and provides reference voltage for the input in the same direction for signal amplification circuit; Input signal is amplified processing by described signal amplification circuit, and by providing the method for the common-mode voltage with difference to eliminate the clutter of idle periods for the P end of differential signal and N end.
3. AUX signal test system as claimed in claim 1 or 2, it is characterised in that described signal gathering unit includes the configuration module, data acquisition module, signal trigger module and the signal memory module that are solidified on a PLD;
Described configuration module is used for obtaining upper-layer configured data, including sample frequency, sampling depth, trigger signal source and signal type;
The signal that signal processing unit is exported by described data acquisition module carries out difference and turns single-ended process, and this single-ended signal is sampled by sample frequency and sampling depth according to arranging, and according to trigger signal source, sampled signal is assigned to signal trigger module;
Described signal trigger module is for being sent to signal memory module after the sampled signal meeting trigger condition being triggered; Host computer obtains data from described signal memory module and carries out waveform drawing and data parsing.
4. AUX signal test system as claimed in claim 3, it is characterised in that described signal gathering unit also includes the FIFO buffer memory being solidified on described PLD; Described signal memory module connects signal trigger module by described FIFO buffer memory; Described FIFO buffer memory, for being sent to signal memory module after the signal buffer memory of signal trigger module output, plays clock-domain crossing data reciprocal action.
5. AUX signal test system as claimed in claim 4, it is characterised in that described signal gathering unit also includes the DDR being solidified on described PLD, and outside host computer connects described signal memory module by DDR.
6. the AUX signal testing method based on the AUX signal test system described in any one of claim 1 to 5, it is characterised in that specifically include following steps:
(1) upper-layer configured order is obtained, and according to configuration order configuration signal acquisition module;
(2) according to trigger signal source, the signal to be triggered collected is assigned to signal trigger module;
(3) detection meets the signal to be triggered of trigger condition, is assigned to signal memory cell after being triggered;
(4) above-mentioned signal is stored in DDR by signal memory cell;
(5) from DDR, extract data, carry out waveform reduction and data parsing;
(6) derive resolving the data obtained, adopt binary system or hex file storage.
7. AUX signal testing method as claimed in claim 6, it is characterised in that the reducible one-tenth signal waveform of data derived in described step (6).
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Address after: 430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the four floor, No. Applicant after: Wuhan fine test electronics group Limited by Share Ltd Address before: 430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the four floor, No. Applicant before: Wuhan Jingce Electronic Technology Co., Ltd. |
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