CN109359068A - The processing method of Circular gratings high-throughput angle measurement data based on Labview - Google Patents
The processing method of Circular gratings high-throughput angle measurement data based on Labview Download PDFInfo
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Abstract
The processing method for the Circular gratings high-throughput angle measurement data based on Labview that the invention discloses a kind of passes sequentially through the binary data for chronologically obtaining the transmission of Circular gratings reading head；Digital signal is decoded by FPGA module, identification 26 binary system angle-datas therein, error bit, warning position, CRC check position；And binary system angle information is uploaded to Real Time system by DMA-FIFO, binary system angle is scaled actual angle value by Real Time system and stores realization；The processing method of the Circular gratings high-throughput angle measurement data based on Labview realizes the high speed acquisition of angle-data, high speed storing, solve the problems, such as high speed acquisition of the angle-data under Labview environment and data high-speed flow table, and the algorithm complexity that this method is related to is not high, suitable for the angle collection system of various instrument and equipments, there is good use value and promotion prospect.
Description
Technical field
The present invention relates to TT&C system information technology field, in particular to a kind of Circular gratings height based on Labview is handled up
The processing method of rate angle measurement data.
Background technique
In the current informationization epoch, for high-throughput, the requirement of high accuracy measurement and control system is higher and higher.For numerous phases
For closing enterprise, the raising of observation and control technology is all to be badly in need of.The accuracy of positioning, corresponding rapidity, the data of high-throughput
Transmission, these have far-reaching influence for the development of enterprise.Especially the development of China's modern industry is with greater need for new technique
It supports.And the appearance of observation and control technology just meets the demand of people.By applying observation and control technology, industry can not only be stepped up
Production efficiency improves a series of accuracy of fine measuring instruments, while also enriching the type of emerging technology and industry,
The fast development of China's industrial sector has been pushed to a certain extent.Under the background of made in China 2025, observation and control technology has pole
Big application and promotional value, need people to further investigate.Wherein,
BISS communication protocol is a kind of full duplex synchronous serial bus communication protocol, exclusively for meet it is real-time, two-way, high speed
Sensor communication and design, be usually used in motion control field.BISS agreement has high response speed, using RS422 interface
BISS agreement baud rate is 10Mbit/s.BISS agreement has high reliability, can guarantee data using 6 cyclic redundancy checks
Accuracy, further include a warning position and a bit-errors position in each frame data.BISS agreement is conducive to progress data and synchronizes, and passes
Sensor carries out data update when first clock pulses arrives, and the delay that each frame reaches Subsequent electronic equipment is all identical
's.
FPGA (Field-ProgrammableGateArray), i.e. field programmable gate array, it be PAL, GAL,
The product further developed on the basis of the programming devices such as CPLD.It is as one in the field specific integrated circuit (ASIC)
It plants semi-custom circuit and occurs, not only solved the deficiency of custom circuit, but also overcome original programming device gate circuit number to have
The shortcomings that limit.With the circuit design that hardware description language (Verilog or VHDL) is completed, simple synthesis and cloth can be passed through
Office, is quickly burned on FPGA and is tested, and is the technology mainstream of modern IC designs verifying.These editable elements can be by
For realizing some basic logic gates (such as AND, OR, XOR, NOT) or more more complicated combination function such as
Decoder or mathematical equation.Inside most of FPGA, also for example touched comprising memory cell in these editable elements
Send out device (Flip-flop) or other more complete block of memory.
Summary of the invention
The object of the present invention is to provide a kind of solution angle-datas to realize that high speed acquisition and data are high under Labview environment
The processing method of the Circular gratings high-throughput angle measurement data based on Labview of the problems such as fast flow table.
For this purpose, technical solution of the present invention is as follows:
A kind of processing method of the Circular gratings high-throughput angle measurement data based on Labview, steps are as follows:
The binary data that S1, the reading head for chronologically obtaining Circular gratings transmit；
S2, in FPGA module, frame by frame to step S1 obtain binary data successively carry out the identification of angle position, error bit
Identification, warning position identification and cyclic redundancy check code identification and processing, obtain several data communication frames；
Wherein, the method for the processing specifically:
When binary data at the error bit in a data communication frame is 0, stop step S1, to Circular gratings into
Restart again after row cooling processing；
When binary data at the warning position in a data communication frame is 0, check on Circular gratings with the presence or absence of different
Object；
What 6 bit binary datas and FPGA module end at the cyclic redundancy check code in a data communication frame calculated
When cyclic redundancy check code is not inconsistent, check whether ground wire disconnects or whether signal wire nearby has a forceful electric power interference, while by the data
Angle-data in communication frame replaces with the new angle-data gone out by interpolation calculation；
S3, several data communication frames obtained by step S2 are uploaded to Real Time system by DMA-FIFO,
Angle binary data in each data communication frame is scaled actual angle value by Real Time system and is stored.
Further, in step sl, it is taken between FPGA module and the reading head of Circular gratings using NI6584 adapter
Digital signal differential path is built, FPGA module is made to receive differential digital signal from Circular gratings reading head.In the step,
Labview is developed in environment, using differential signal acquisition angle information, realizes the purpose for inhibiting common mode interference.
Further, in step sl, digital signal differential path is built method particularly includes: by NI6584 adapter
It is inserted into the board interface of FPGA module；Simultaneously by the pin 1 of NI6584 adapter arbitrary port and Circular gratings reading head
Pin 1 connects, and the pin 4 of identical port is connect with the pin 6 of Circular gratings reading head, by the pin 5 of identical port and circle light
The pin 7 of grid reading head connects, and the pin 8 of identical port is connect with the pin 2 of Circular gratings reading head, by drawing for identical port
Foot 9 is connect with the pin 3 of Circular gratings reading head.
Further, in step s3, binary system angle-data is transmitted using DMA-FIFO, is because of DMA-
FIFO is the dual port buffer of a first in, first out, i.e., first data first entered in it is moved out of, one of mouth
It is the input port of memory, another mouthful is the delivery outlet of memory, can realize and 1) delay to continuous data flow
Deposit, prevent from losing data when into machine and storage operation, 2) data put together and can avoid frequent total into machine and storage
Line operation, offloading the CPU, 3) allow system to carry out dma operation, improve the transmission speed of data；And then use Real
Flow data in Time system reading DMA-FIFO and the reason of angle binary message is converted to angle information is, one
It is that binary system angle-data stream is scaled angle-data stream using Real Time real-time system, compared to directly using upper
Position machine has higher real-time, can guarantee that data flow is continually and steadily transmitted, and secondly the store function of Real Time system is realized
Angle-data stream is individually stored into its disk, redundancy backup, when host computer needs to call angle-data, Real are formed
Angle-data stream can be transferred to host computer by Time system by way of network flow immediately.As it can be seen that developing ring in Labview
In border, by DMA-FIFO transmission of angle binary message to Real Time system can reasonable distribution hardware resource, make system
Middle hardware plays respective advantage.
Compared with prior art, it is somebody's turn to do the processing method tool of the Circular gratings high-throughput angle measurement data based on Labview
It is standby following the utility model has the advantages that
1) this method can by adjusting data collection cycle at any time, facilitate the alignment for carrying out multichannel data with synchronize adopt
Collection；
2) this method can be realized high-speed transfer angle-data, and 1 second volume of transmitted data can achieve 25000；
3) this method makes binary data stream high speed, lossless using Real Time system by cooperating with FPGA
High-speed transitions and storage that Real Time system carries out angle-data stream are transmitted to, realize the characteristics of respectively exerting advantages of oneself,
Optimize system resource.
Detailed description of the invention
Fig. 1 is the process of the processing method of the Circular gratings high-throughput angle measurement data of the invention based on Labview
Figure；
Fig. 2 is Circular gratings BISS agreement timing diagram；
Fig. 3 is the mode of connection schematic diagram of the reading head of the NI6584 adapter and Circular gratings in the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described further, but following embodiments are absolutely not to this hair
It is bright to have any restrictions.
As shown in Figure 1, being somebody's turn to do the specific place of the processing method of the Circular gratings high-throughput angle measurement data based on Labview
Steps are as follows for reason:
The binary data that S1, the reading head for chronologically obtaining Circular gratings transmit；
S2, in FPGA module, frame by frame to step S1 obtain binary data successively carry out the identification of angle position, error bit
Identification, warning position identification and cyclic redundancy check code identification and processing, obtain several data communication frames；
Wherein, the method for the processing specifically:
(1) reading head overheat will seriously affect the detection of angle-data, can set error flag position to very, reminding at this time
User carries out cooling processing；
Therefore, when the binary data at the error bit in a data communication frame is 0, stop step S1, to circle
Grating restarts again after carrying out cooling processing；
(2) such as occurring spot on Circular gratings and will lead to reading to be affected, reading head can identify the spot on Circular gratings,
And it is set as 0 by the way that position will be alerted, remind user to clean Circular gratings；
Therefore, when the binary data at the warning position in a data communication frame is 0, check whether deposit on Circular gratings
In foreign matter；
(3) cyclic redundancy check code is by carrying out the calculating of CRC cyclic redundancy to 26 binary system angle informations and will calculate
6 moulds two obtained remove remainder, and compare with 6 cyclic redundancy checks received from Circular gratings, check remainder and 6 CRC checks
Whether code is consistent；
Therefore, the binary data at the cyclic redundancy check code in a data communication frame is followed with what the end FPGA calculated
When ring redundancy check code is not inconsistent, check whether ground wire disconnects or whether signal wire nearby has forceful electric power interference, while the data being led to
Angle-data in letter frame replaces with the new angle-data gone out by interpolation calculation；Herein, the specific method of interpolation calculation is:
The previous angle-data and the latter angle-data of angle-data for needing to replace are searched, by previous angle-data and latter
The average value that a angle-data is sought after summing up is new angle-data；
S3, several data communication frames obtained by step S2 are uploaded to Real Time system by DMA-FIFO,
Angle binary data in each data communication frame is scaled actual angle value by Real Time system and is stored.
Specifically, this method is by the reading head of sequentially connected Circular gratings, FPGA module, NI8840 controller and host computer
It realizes；Wherein, equipped with Real Time system on NI8840 controller.
In the method, signal transmitting terminal i.e. circle light deletes reading head, signal receiving end, that is, FPGA module, and FPGA provides circle light
The clock signal that grid reading head needs, Circular gratings determine the frequency for sending data bit according to clock signal, data are sent frame by frame
To FPGA.The alignment for being conducive to subsequent multiple sensor acquisition data as acquisition chip using fpga chip, is improved data and adopted
The synchronization degree of collection.
The reading head of Circular gratings is differential path using NI6584 adapter configuration FPGA whole port, and FPGA is made to receive circle
The digital signal that grating reading head issues, to reduce common mode interference when acquisition.Wherein, the interface end and circle of NI6584 adapter
The interface end of grating reading head is in compliance with the definition of RS422 interface, passes through the BISS-C protocol realization number defined based on RS422 interface
The transmission of word signal.
Be illustrated in figure 2 Circular gratings BISS agreement timing diagram, thereon information be followed successively by angle-data that Circular gratings detect,
Number of errors evidence, warning position data and cyclic redundancy check code；Wherein, angle-data is 26 bit binary datas；Number of errors
According to being 1 bit binary data with warning position data, i.e., 1 or 0, provided according to BISS agreement, 0 indicate circle light delete operation exist it is wrong
Accidentally, 1 indicate that circle light deletes normal operation；Cyclic redundancy check code is 6 bit binary datas, for inspection data in transmission process
Whether mistake is occurred.
Specifically, NI6584 adapter is inserted into the board interface of FPGA module；NI6584 adaptation is had a high regard for simultaneously
The pin 1 of meaning port is connect with the pin 1 of the interface end of Circular gratings reading head, and the pin 4 of identical port and Circular gratings are read
The pin 6 of the interface end of head connects, and the pin 5 of identical port is connect with the pin 7 of the interface end of Circular gratings reading head, by phase
It is connect with the pin 8 of port with the pin 2 of the interface end of Circular gratings reading head, the pin 9 of identical port and Circular gratings is read
The pin 3 of the interface end of head connects；In addition, by the pin 4 of the interface end of Circular gratings reading head and pin 5 with 5V positive pole
Connection, and its pin 8 and pin 9 are connect with the cathode of 5V power supply, metal shell ground connection, i.e., as shown in Figure 3.
FPGA module handles the digital signal received from Circular gratings reading head, specifically, in FPGA
Write the transport protocol communicated with Circular gratings, output signal is to be supplied to the clock pulses of Circular gratings, Circular gratings as
Frequency reference carries out the transmission of each data；Input signal is the data information that Circular gratings are passed to, right based on state machine
One communication frames of this transport protocol are write；The data transmission that can trigger Circular gratings is controlled clock signal, is adjusted
Entire data transmission rate；Then the data structure of the binary data of its transmission is chronologically identified to the initial data received,
26 parallactic angle degree binary data therein, error bit, warning position, 6 CRC check positions are parsed, the binary system of each frame is restored
Angle information guarantees the accuracy of transmission information；For being related to the error bit of hardware security, once there is 0 value, stop institute immediately
There is test, and user is reminded to cool down hardware.For being related to the warning position of optical identification precision, once there is 0 value, remind
User clears up Circular gratings grid ruler.The 6 CRC check positions whether interfered by forceful electric power for being related to transmission process, once school
It tests and does not pass through, indicate that this data is interfered by forceful electric power, it is insincere, the angle value of this mistake is compensated using interpolation method.Particularly,
For repeatedly there is the unsanctioned situation of CRC check, user is reminded to check whether forceful electric power interference or grounding pin are unearthed.
For above-mentioned transport protocol, specifically, transport protocol is write using Labview exploitation environment, transmission association
Discussing includes 3 circulations in corresponding program: first for before triggering collection etc. it is to be recycled, make for configuring frequency acquisition and port
Can, and triggering collection；Second exports control loop for clock pulse signal, for triggering and driving the transmission of sensing data,
The time of each frame in control transmission；Third is that Circular gratings data receiver recycles, and use state machine is write, and is connect by equal pending datas
Receipts, start bit, zero-bit, 26 data bit, error bit, warning position, CRC check position, time-out are basic status, carry out data frame
Parsing, incoming angle information is obtained from Circular gratings.The CRC check of binary message is carried out in time-out period, inspection data is
It is no to be distorted in the transmission.The upload of data is carried out, using DMAFIFO in time-out period to be further analyzed to data.
Next, the angle binary stream data handled by FPGA module are transmitted to Real by DMA-FIFO
Time system.For DMA-FIFO, DMA refers to direct memory access, i.e., one kind is without CPU and directly from memory access number
According to data exchange mode；Data transmission under PIO mode between hard disk and memory is controlled by CPU；And in DMA mode
Under, CPU need only assign instruction to dma controller, allow dma controller to handle the transmission of data, Data Transfer Done is again letter
Breath feeds back to CPU, thus largely alleviates cpu resource occupation rate.And the twoport that FIFO is a first in, first out delays
Device is rushed, i.e., first data first entered in it is moved out of, and one of mouth is the input port of memory, another mouth is
Therefore the delivery outlet of memory can make data high-speed using DMA-FIFO, lossless be transmitted to Real Time system.
Real Time system is converted as dedicated angle signal and storage device, by DMA-FIFO send two into
Angle flow data processed is converted to angle flow data, and the angle flow data of storage within the system then can according to need and pass through net
Network stream is sent to host computer, carries out the drafting and other relevant data analysis work of angle curve.
In conclusion being somebody's turn to do the processing method of the Circular gratings high-throughput angle measurement data based on Labview realizes angle
The high speed acquisition of degree evidence, high speed storing solve high speed acquisition of the angle-data under Labview environment and data high-speed stream
The problem of disk, and the algorithm complexity that this method is related to is not high, suitable for the angle collection system of various instrument and equipments, has
Good use value and promotion prospect.
Above-described embodiment is interpreted as being merely to illustrate the present invention rather than limit the scope of the invention.It is reading
After the content of record of the invention, technical staff can be made various changes or modifications the present invention, these equivalence changes and
Modification equally falls into the scope of the claims in the present invention.
Claims (3)
1. a kind of processing method of the Circular gratings high-throughput angle measurement data based on Labview, which is characterized in that step is such as
Under:
S1, the binary data for chronologically obtaining the transmission of Circular gratings reading head；
S2, in FPGA module, the knowledge of the identification of angle position, error bit is successively carried out to the step S1 binary data obtained frame by frame
Not, the identification and processing of warning position identification and cyclic redundancy check code, obtains several data communication frames；
Wherein, the processing method particularly includes:
When binary data at the error bit in a data communication frame is 0, stop step S1, to Circular gratings reading head
Restart again after carrying out cooling processing；
When binary data at the warning position in a data communication frame is 0, checks and whether there is foreign matter on Circular gratings；
What 6 bit binary datas and FPGA module end at the cyclic redundancy check code uploaded in a data communication frame calculated
When cyclic redundancy check code is not inconsistent, check whether ground wire disconnects or whether signal wire nearby has a forceful electric power interference, while by the data
Angle-data in communication frame replaces with the new angle-data gone out by interpolation calculation；
S3, several data communication frames obtained by step S2 are uploaded to Real Time system by DMA-FIFO, by
Angle binary data in each data communication frame is scaled actual angle value and stored by Real Time system.
2. the processing method of the Circular gratings high-throughput angle measurement data according to claim 1 based on Labview,
It is characterized in that, in step sl, builds digital letter between FPGA module and the reading head of Circular gratings using NI6584 adapter
Number differential path, makes FPGA module receive differential digital signal from Circular gratings reading head.
3. the processing method of the Circular gratings high-throughput angle measurement data according to claim 2 based on Labview,
It is characterized in that, builds digital signal differential path method particularly includes: NI6584 adapter is inserted into the board of FPGA module
In interface；The pin 1 of NI6584 adapter arbitrary port is connect with the pin 1 of Circular gratings reading head simultaneously, by identical port
Pin 4 connect with the pin 6 of Circular gratings reading head, the pin 5 of identical port is connect with the pin 7 of Circular gratings reading head,
The pin 8 of identical port is connect with the pin 2 of Circular gratings reading head, by the pin 9 of identical port and Circular gratings reading head
Pin 3 connects.
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| CN111078612A (en) * | 2019-11-08 | 2020-04-28 | 中国计量科学研究院 | FPGA-based biss-c protocol decoding system |
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Application publication date: 20190219 |