CN104463073A - Barcode decoding chip with bus interface PS2 - Google Patents
Barcode decoding chip with bus interface PS2 Download PDFInfo
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- CN104463073A CN104463073A CN201410819487.6A CN201410819487A CN104463073A CN 104463073 A CN104463073 A CN 104463073A CN 201410819487 A CN201410819487 A CN 201410819487A CN 104463073 A CN104463073 A CN 104463073A
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Abstract
The invention discloses a barcode decoding chip with a bus interface PS2. The barcode decoding chip comprises a main controller module, a decoding module, an image storing unit, an exposure control module, a register storing unit, a setting code processing module and a bus interface PS2 module. The main controller module is used for controlling working states and processing flows of the decoding module, the image storing unit, the exposure control module, the register storing unit, the setting code processing module and the bus interface PS2 module. The function of barcode decoding and the function of the bus interface PS2 can be achieved on the same chip, the area of a circuit board is miniaturized, the anti-electromagnetic interference ability is promoted, and the maintenance difficulty and the product cost are reduced.
Description
Technical field
The present invention is applicable to bar-code identification field, particularly relates to a kind of bar code decoding chip with PS2 keyboard interface.
Background technology
Barcode technology be of growing up in computer technology and Information Technology Foundation integrate encode, print, identify, the emerging technology of data acquisition and processing (DAP).Barcode technology is due to its fast recognition, accurate, reliable and low cost and other advantages, be widely used in the fields such as business, taking care of books, storage, post and telecommunications, traffic and Industry Control, and great effect certainly will be played in " Internet of Things " application of rising gradually.
The bar code be widely used at present comprises bar code and two-dimensional bar code.Bar code, also known as linear bar code, is made up of multiple " bar " arranged in parallel and " sky " unit, and bar code information is expressed by bar and empty different in width and position.Bar code, just in a direction (being generally horizontal direction) expressing information, does not then express any information in the vertical direction, therefore information capacity and space availability ratio lower, and after bar code is damaged i.e. None-identified.Two-dimensional bar code is made up of the chequered with black and white particular geometric figure distributed in the two-dimensional direction according to certain rules, and it can expressing information in the two-dimensional direction, therefore information capacity and space availability ratio higher, and there is certain verifying function.Two-dimensional bar code can be divided into stack two-dimensional bar code and matrix two-dimensional barcode.Stack two-dimensional bar code forms by the bar code of multirow cutting back is stacking, and representational stack two-dimensional bar code comprises PDF417, Code 49, Code 16K etc.Matrix two-dimensional barcode is made up of black, the white module be distributed in by pre-defined rule in matrix, and representational matrix two-dimensional barcode comprises Codeone, Aztec, Data Matrix, OR code, Chinese letter co etc.
Existing bar code decoding process is generally utilize the mode of software decode to realize, and need to write within a processor a series of software programs realizing decoding algorithm, software program is easily reversed engineering and cracks; Because the single processor same time can only carry out decoding process for a kind of barcode standard of particular type simultaneously, therefore decoding speed is comparatively slow, can not process the bar code of multiple format type simultaneously; Moreover because the software algorithm realizing bar code decoding is comparatively complicated, generally speaking therefore adopted processor is high-end processor (as 32 bit processors), due to high-end processor price costly, therefore cause cost to raise.Or need to increase processor to carry out the simulated implementation of PS2 bus, so just need the necessary module increasing processor and processor periphery in bar code decoding circuitry: RAM, FLASH, interface circuit etc.; Greatly improve the difficulty of exploitation like this, cause decoding device circuit-board laying-out difficult wiring, cause the area of circuit board cannot miniaturization; Cause anti-electromagnetic interference capability poor, cause producing assembling complexity, maintenance difficulty is large; And considerably increase the cost of product.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of bar code decoding chip with PS2 bus interface, bar code decoding function and PS2 bus interface function can be realized on same chip, described PS2 bus interface module just can realize the connection with external unit without the need to hanging CPU, make the area miniaturization of circuit board, promote anti-electromagnetic interference capability, lower maintenance difficulties and cost of products.
For solving the problems of the technologies described above, a kind of bar code decoding chip with PS2 bus interface provided by the invention, comprising:
Exposure control module, for the duty of control both optical imageing sensor;
Image storage unit, for storing the bar code image data that described imageing sensor is sent here;
Register memory cell, comprises control register and status register, and described control register is used for temporary order, and described status register is used for result and the information of temporary each resume module;
Decoder module, for carrying out parallel decoding to the bar code image data in described image storage unit;
PS2 bus interface module, comprises PS2 keypad function module and at least one main PS2 interface module, for communicating with external unit;
Main controller module, be electrically connected with shown control decoder module, image storage unit, exposure control module, register memory cell and PS2 bus interface module, for duty and the treatment scheme of described control decoder module, image storage unit, exposure control module, register memory cell and PS2 bus interface module.
Preferably, also comprise and a yard processing module is set, the described yard processing module that arranges is electrically connected respectively with described register memory cell and described main controller module, bar code is set for use Read-write Catrol is carried out to register memory cell, and realize the information back in register memory cell in plug-in configure storage unit.
Preferably, described decoder module comprises PDF417 bar code decoding module, the decoding of DM bar code module, the decoding of QR bar code module, the decoding of Chinese creed code module, the decoding of bar code module and RSS bar code decoding module.
Preferably, the decoding of the decoding of described PDF417 bar code decoding module, DM bar code module, QR bar code module, the decoding of Chinese creed code module, the decoding of bar code module and RSS bar code decoding module are parallel decoding.
Preferably, described PS2 bus interface module also comprises one from PS2 interface module, for external connection keyboard, for receiving keyboard data and forwarding host computer order.
Preferably, also comprise trigger key, described triggering case is electrically connected with main controller module, for opening described exposure control module.
Preferably, described PS2 bus interface module is communicated with external unit by PS2 bus.
Preferably, described PS2 bus is made up of data line and clock line.
Preferably, described external unit is desk-top computer, palm PC, server, embedded system or mobile phone.
Preferably, described from PS2 interface module and main PS2 interface module parallel join to described PS2 keypad function module.
A kind of bar code decoding chip with PS2 bus interface of the present invention, bar code decoding function and PS2 bus interface function can be realized on same chip, described PS2 bus interface module just can realize the connection with external unit without the need to hanging CPU, make the area miniaturization of circuit board, promote anti-electromagnetic interference capability, lower maintenance difficulties and cost of products.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is the bar-code decoder structural representation of band PS2 bus interface of the present invention;
Fig. 2-Fig. 3 is the bar-code decoder first example structure schematic diagram of band PS2 bus interface of the present invention;
Fig. 4 is the bar-code decoder second example structure schematic diagram of band PS2 bus interface of the present invention;
Fig. 5 is bar-code decoder the 3rd example structure schematic diagram of band PS2 bus interface of the present invention.
Main Reference comparative descriptions:
Decoding chip 100 configure storage unit 200
Imageing sensor 300 main controller module 101
Decoder module 102 image storage unit 103
Exposure control module 104 register memory cell 105
Yard processing module 106 PS2 bus interface module 107 is set
The main PS2 interface module 1072 of PS2 keypad function module 1071
Decoding chip 120 configure storage unit 220
Imageing sensor 320 main controller module 121
Decoder module 122 image storage unit 123
Exposure control module 124 register memory cell 125
Yard processing module 126 PS2 bus interface module 127 is set
The main PS2 interface module 1272 of PS2 keypad function module 1271
From PS2 interface module 1273
Decoding chip 130 configure storage unit 230
Imageing sensor 330 main controller module 131
Decoder module 132 image storage unit 133
Exposure control module 134 register memory cell 135
Yard processing module 136 PS2 bus interface module 137 is set
The main PS2 interface module 1372 of PS2 keypad function module 1371
From PS2 interface module 1373 trigger key 138
Embodiment
For can further description be had to object of the present invention, feature and effect, below coordinate accompanying drawing describe in detail as after.
As Figure 1-3, for the bar-code decoder of band PS2 bus interface of the present invention, comprise decoding chip 100, configure storage unit 200 and optical image sensor 300, described configure storage unit 200 and optical image sensor 300 are electrically connected with decoding chip 100 respectively; Described configure storage unit 200 and optical image sensor 300 carry out bidirectional data exchange with decoding chip 100 respectively.
Decoding chip 100 comprises main controller module 101, decoder module 102, image storage unit 103, exposure control module 104, register memory cell 105, arranges yard processing module 106 and PS2 bus interface module 107.
Main controller module 101, be electrically connected with shown control decoder module, image storage unit, exposure control module, register memory cell and PS2 bus interface module, for controlling decoder module 102, image storage unit 103, exposure control module 104, register memory cell 105, the duty arranging yard processing module 106 and PS2 bus interface module 107 and treatment scheme.
Decoder module 102 comprises PDF417 bar code decoding module, the decoding of DM (Data Matrix) bar code module, the decoding of QR (Quick Response) bar code module, the decoding of Chinese creed code module, the decoding sub-module such as the decoding of bar code module and RSS bar code decoding module; Dissimilar decoding sub-module is for the treatment of the bar code image of different barcode standard, i.e. parallel decoding, it utilizes hardware logic to realize, the decoder module being specially each type first all can carry out the search of respective key point, the location of bar code module location point is then carried out according to key point, then carry out floating point grey scale calculating, binaryzation, error correction, decoding, restore the code word information in bar code image.
Exposure control module 104, by I2C (Inter-Integrated Circuit IC bus) control both optical imageing sensor 300, with the duty of control both optical imageing sensor 300.In addition, the monochrome information of optical image sensor 300 can pass to exposure control module 104, and exposure control module 104, according to the output image brightness value of obtained monochrome information control both optical imageing sensor 300, ensures the quality of decode image data; Be specially and by I2C (Inter-Integrated Circuit IC bus) interface, initial configuration carried out to optical image sensor 300 when power-up initializing, be configured to the pattern of manual adjustment of exposure and gain.After startup decoding, exposure control module 104 reads the image data information that optical image sensor 300 exports, be averaged to view data the brightness value calculating present image of brightness, the relatively expectation brightness value of present intensity value and register memory cell 105, when present intensity is greater than expectation brightness, first reduce Simulation scale-up yield value, gain reduces exposure time values after being transferred to minimum value again; Present intensity is less than when expecting brightness, first improves mould exposure time values, exposure time values be transferred to maximum after increase Simulation scale-up gain time value again; The image brightness values that optical image sensor 104 exports the most at last adjusts back to rapidly to be expected, on brightness value, to ensure the quality of decode image data.Brilliance control mechanism comprises: full figure controls, partly scheme control, Partial controll, adapts to different application demands.
Image storage unit 103, for storing the bar code image data that optical image sensor 300 is sent here, is realized by RAM (random access memory random access memory) at chip internal; X/Y axle mirror image or inverse process can be carried out to image according to the control register of register memory cell 105.
In image storage unit 103, the bar code image of reproducible polylith is supplied to decoding sub-module different in decoder module 101 respectively and decodes simultaneously, and the image of a spoke code can carry out PDF714 bar code decoding, DM bar code decoding, QR bar code decoding, Chinese letter bar code decoding, bar code decoding or RSS bar code decoding module simultaneously; A module first separates bar code, then will stop other bar code decodings, and all information just exports according to the bar code of successfully decoded, and all like this bar codes are parallel decodes, and originally needs N*6 decode time to be shortened into N, substantially increases the time of decoding.N is the decode time of a decoding sub-module.
Register memory cell 105 comprises control register and status register, and described control register is used for temporary order, and makes specific action according to particular command; Each module (the inner all modules of decoding chip 100 and processing unit is controlled by calling of main controller module 101, as exposure control module 104, decoder module 102 and graphic storage unit 103 etc.), also the result of each resume module and information are delivered in status register simultaneously; Described status register is used for result that temporary each module (the inner all modules of decoding chip 100 and processing unit, as exposure control module 104, decoder module 102 and graphic storage unit 103 etc.) processes and information, i.e. temporal data; Exposure control module 104 is configured optical image sensor 300 according to the expectation brightness in control register, maximum exposure time, maxgain value, and the view data that optical image sensor 300 exports is assessed, the information of assessment is sent to status register; Decoder module 102 is decoded according to each bar code decoding SR configuration in control register, and decoded code part of speech type, error-correction level, decoding error number, bar code key point positional information is reacted in status register.
Yard processing module 106 is set, bar code is set for use Read-write Catrol is carried out to register memory cell 105, and realize the information back in register memory cell 105 in plug-in configure storage unit 200; Be specially: main controller module 101 finds that the current bar code solved is for after arranging bar code, start and the rationality that yard processing unit 106 analyzes current setting bar code is set, if rationally, analyze the address arranging bar code and need the register of operation, need the mask of write or the data read and write data, when reading the data, the content of actual registers is sent in PS2 bus interface module 107 according to particular form; When the data is written, first the data of current address are read, then according to being written back in register memory cell 105 again after mask and the write corresponding position of data rewriting, then all the elements of register memory cell 105 are written to successively in plug-in configure storage unit 200, calculate data check value simultaneously, finally proof test value is write in the lump in plug-in configure storage unit 200; If unreasonable, point out unreasonable prompt tone; The described bar code that arranges must be CODE 128FNC3 coded system.
PS2 bus interface module 107, be electrically connected with main controller module 101, main controller module 101 is communicated with external unit by PS2 bus interface module 107, as host computer 400, described external unit or host computer 400 are desk-top computer, palm PC, server, embedded system or mobile phone; Described PS2 bus interface module 107 is communicated with host computer 400 by PS2 bus (not marking); Described PS2 bus interface module 107 comprises PS2 keypad function module 1071 and main PS2 interface module 1072.Described PS2 bus is made up of data line and clock line, and data line and clock line are all open-collector, so data line and clock line will there be a large pull-up resistor, allowing PS2 bus give tacit consent to is be high level.
PS2 keypad function module 1071 is in the initialization of upper electroresponse host computer 400: reset command process, the process of keyboard ID reading order, garbled-reception process, ECHO command process; The passage of communication is established with host computer 400.Information code word after decoder module 102 successfully decoded sends to PS2 keypad function module 1071 bar code code word information by main controller module 101, here bar code code word information is ASIC code, the configuration of register memory cell 105 Chinese Home keyboard, the national key assignments table of Response to selection is inquired about, and the key assignments obtained tabling look-up is sent in the transmission buffer of main PS2 interface module 1072.PS2 keypad function module 1071 realizes Three models: QWERTY keyboard pattern, emulation input keyboard pattern, Simulation Control input keyboard pattern, meet the application of different occasion.
Main PS2 interface module 1072, sends the underlying protocol of key assignments in transmission buffer according to complete PS2 bus, and produce the clock signal of communication, clock frequency is operated in the scope of 10K-33K; All data are pressed bytewise and are sent, the frame structure of transmission: 1 start bit (being always 0), 8 data bit (status is front), 1 check bit (odd), 1 position of rest (being always 1).Check bit verifies for data bit, if data bit comprises even number 1, check bit will put 1; If comprise odd number 1 in data bit, check bit will set to 0.Number in data bit adds check bit always for odd number, is used for error-detecting.
Configure storage unit 200 is used for all control registers in save register storage unit 105 and the configuration data in status register, re-powers configuration data again and lose after preventing power down.Configure storage unit 200 can realize with this kind of nonvolatile memory of EEPROM or FLASH.Point two pieces of regions in configure storage unit 200: manufacturer's configuring area and user's configuring area, in manufacturer's configuring area, data are rewritten by equipment vendors, the configuration control information that mainly hardware is relevant, configure storage unit 200 of before dispatching from the factory, configuration accordingly being write direct.User's configuring area is rewritten as required by user, rewrites by the transmission arranging bar code.In initialization procedure after the power-up, first by the data importing of configure storage unit 110 in register memory cell 104, recover previous setting.
Optical image sensor 300 can use CMOS (complementary metal oxide semiconductor (CMOS)) or CCD (Charge Coupled Device (CCD) imageing sensor) optical image sensor, for gathering bar code image, and by the transmission of the data of bar code image stored in image storage unit module 103.
Whether main controller module 101 Real-Time Monitoring has decoding trigger pip, after signal being detected, open exposure control module 104 pairs of optical image sensors 300 to control, obtain the complete view data of a frame from optical image sensor 300, by data stored in image storage unit 103; The image that then primary controller module 101 starts to start decoder module 102 pairs of image storage unit 103 is decoded, and optionally according to the control register in register memory cell 105 is sewed and sends into PS2 keypad function module 1071 after successful code word information assembling of decoding in AIM ID, TYPE ID (type knows reference symbol number), self-defined front and back.Main controller module 101 is coordinated modules and is carried out orderly decoding effort.Described decoding trigger pip is specially: exposure control module 104, when decoding and not working, the exposure of external optical image sensor 300 and yield value are set to suitable fixed value, then start the average brightness value of two frame image datas before and after comparison, after mean flow rate is worth absolute value difference to be greater than the photosensitive threshold value in register memory cell 105, exposure control module 104 can send indicator signal and require that main controller module 101 carries out getting figure decode operation, thus triggers decoding.Achieve the light sensing mode triggering decoding by experiencing the change of outside light intensity.
As shown in Figure 4, for bar-code decoder second embodiment of band PS2 bus interface of the present invention, comprise decoding chip 120, configure storage unit 220 and optical image sensor 320, described configure storage unit 220 and optical image sensor 320 are electrically connected with decoding chip 120 respectively; Described decoding chip 120 comprises main controller module 121, decoder module 122, image storage unit 123, exposure control module 124, register memory cell 125, arranges yard processing module 126 and PS2 bus interface module 127.
Be with the difference of the first embodiment, described PS2 bus interface module 127 increases by one from PS2 interface module 1273, for external connection keyboard 520, receives keyboard data and forwards host computer 420 and order.Be specially: on down going channel, main PS2 interface module 1272 separates data and is judged whether to need to be transmitted to external connection keyboard 520 by PS2 keypad function module 1271 after receiving the control command that host computer 420 issues.For needing the order forwarded as lighting order, carried out sending to external connection keyboard 520 according to PS2 bus protocol by main PS2 interface module 1272.On data feedback channel, key assignments whether is had to need to send from the external connection keyboard 520 of PS2 interface module 1273 monitoring in real time, separate data are carried out sendaisle arbitration by PS2 keypad function module 1271: find currently have bar code code word information to be in pass through journey, then notify the transmission suppressing external connection keyboard 520 from PS2 interface module 1273, suppress keyboard 520 from PS2 interface module 1273 by the mode dragging down clock line.Find the current process being in keyboard key assignments and forwarding, then postpone bar code code word information on give.Ensure that single passage sends the integrality of data.The key assignments of external connection keyboard is finally transmitted to host computer 420 by main PS2 interface module 1272.Needs according to application can increase more from PS2 interface module, from PS2 interface module and main PS2 interface module parallel join to PS2 keypad function module.
As shown in Figure 5, for bar-code decoder the 3rd embodiment of band PS2 bus interface of the present invention, comprise decoding chip 130, configure storage unit 230 and optical image sensor 330, described configure storage unit 230 and optical image sensor 330 are electrically connected with decoding chip 130 respectively; Described decoding chip 130 comprises main controller module 131, decoder module 132, image storage unit 133, exposure control module 134, register memory cell 135, arranges yard processing module 136 and PS2 bus interface module 137.
Be with the difference of the second embodiment, add trigger key 138, for opening exposure control module 134, control both optical imageing sensor 330 starts scanning.Scan command is sent to main controller module 131 specifically by startup trigger key 138, scan command is kept in the control register in register memory cell 135 by main controller module 131, controls exposure control module 134 thus and starts optical image sensor 330 startup scanning.
The bar-code decoder of band PS2 bus interface of the present invention, same chip realizes bar code decoding function and PS2 bus interface function, described PS2 bus interface module just can realize the connection with external unit without the need to hanging CPU, make the area miniaturization of circuit board, promote anti-electromagnetic interference capability, lower maintenance difficulties and cost of products.
Above by specific embodiment to invention has been detailed description, but these are not construed as limiting the invention.Without departing from the principles of the present invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (10)
1. the bar code decoding chip with PS2 bus interface, is characterized in that, comprising:
Exposure control module, for the duty of control both optical imageing sensor;
Image storage unit, for storing the bar code image data that described imageing sensor is sent here;
Register memory cell, comprises control register and status register, and described control register is used for temporary order, and described status register is used for result and the information of temporary each resume module;
Decoder module, for carrying out parallel decoding to the bar code image data in described image storage unit;
PS2 bus interface module, comprises PS2 keypad function module and at least one main PS2 interface module, for communicating with host computer;
Main controller module, be electrically connected with shown control decoder module, image storage unit, exposure control module, register memory cell and PS2 bus interface module, for duty and the treatment scheme of described control decoder module, image storage unit, exposure control module, register memory cell and PS2 bus interface module.
2. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, also comprise and a yard processing module is set, described setting between yard processing module and described register memory cell and described main controller module is electrically connected to each other, bar code is set for use Read-write Catrol is carried out to register memory cell, and realize the information back in register memory cell in plug-in configure storage unit.
3. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, described decoder module comprises PDF417 bar code decoding module, DM bar code decoding module, QR bar code decoding module, Chinese creed code decoder module, bar code decoder module and RSS bar code decoding module.
4. the bar code decoding chip of band PS2 bus interface as claimed in claim 3, it is characterized in that, described PDF417 bar code decoding module, DM bar code decoding module, QR bar code decoding module, Chinese creed code decoder module, bar code decoder module and RSS bar code decoding module are parallel decoding.
5. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, described PS2 bus interface module also comprises one from PS2 interface module, for external connection keyboard, receives keyboard data and forwards described host computer order.
6. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, also comprise trigger key, described triggering case is electrically connected with main controller module, for opening described exposure control module.
7. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, described PS2 bus interface module is communicated with external unit by PS2 bus.
8. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, described PS2 bus is made up of data line and clock line.
9. the bar code decoding chip of band PS2 bus interface as claimed in claim 1, it is characterized in that, described external unit is desk-top computer, palm PC, server, embedded system or mobile phone.
10. the bar code decoding chip of band PS2 bus interface as claimed in claim 5, is characterized in that, described from PS2 interface module and main PS2 interface module parallel join to described PS2 keypad function module.
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Address after: 350015 No. 1 Rujiangxi Road, Mawei District, Fuzhou City, Fujian Province Patentee after: New Continent Digital Technology Co., Ltd. Address before: 350015 No. 1 Rujiangxi Road, Mawei District, Fuzhou City, Fujian Province Patentee before: Fujian Newland Computer Co., Ltd. |