CN101004904B - Device for accelerative displaying cursor - Google Patents
Device for accelerative displaying cursor Download PDFInfo
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- CN101004904B CN101004904B CN2006100332021A CN200610033202A CN101004904B CN 101004904 B CN101004904 B CN 101004904B CN 2006100332021 A CN2006100332021 A CN 2006100332021A CN 200610033202 A CN200610033202 A CN 200610033202A CN 101004904 B CN101004904 B CN 101004904B
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Abstract
A speeding up device of cursor display-update is prepared for responding cursor updating signal outputted from display synthetic module by switch-over module, connecting input end to display-storage control module, switching output end over between master screen fetching module and cursor fetching module according cursor updating signal, receiving display data outputted from display synthetic module by display driving circuit and mapping said display data coordinately with driving time sequence signal onto current pixel of display terminal.
Description
[technical field]
The present invention relates to a kind of display device that cursor shows that has, relate in particular to and make cursor acceleration device shown.
[background technology]
A lot of embedded systems all have complicated man-machine interface, need to draw on display device interface elements such as cursor, mouse, menu, message box.The display subsystem of these embedded systems is made up of display device, video memory and display driver circuit etc. usually.In order to show complicated interface, use video memory independently to replace main memory and store lattice information on the display screen, to improve the utilization factor of CPU and main memory.A point on the corresponding display device of each data in the video memory.CPU writes data toward video memory, and the point that promptly is equivalent to draw on display device, display driver circuit can automatically read the interior video data of video memory and its tram on display device is shown.
A lot of embedded systems all use FPGA (Field Programmable Gate-Array field programmable gate array) to realize display driver circuit, because this is a kind of with low cost, dirigibility is high, extensibility is good solution.The FPGA parts that are absolutely necessary utilize part resource wherein to realize that display driver has improved the integrated level of system undoubtedly greatly, has reduced cost in a lot of systems.Yet the function of these display driver circuits is comparatively simple mostly, does not provide corresponding cursor to quicken function.For example: the cursor on the current screen is if (Xa, (Xb, in the time of Yb), the CPU at first position A in video memory writes background data when not having cursor, and then to position B write cursor data Ya) to have moved to position B by position A.In this process, it should be noted that two problems: at first, cursor is actually by one group of two-dimensional matrix (being generally 16 * 16 or 32 * 32) to be formed, its adjacent lines corresponding data address in video memory is not continuous, and currently used video memory great majority are SDRAM (synchronous DRAM) or DDR SDRAM (double data rate synchronous DRAM), the inner structure of this class storer is divided into several rows, adopt burst mode (Burst) connected reference to be exceedingly fast, the speed of visit different rows data then very slow (be about with line speed 1/10) with the speed of data line; Secondly, because cursor appearance is not frequent variation, so the cursor data that writes generally all is repetition at every turn.Can see for comprehensive above 2, it is very a poor efficiency and a repeated work that CPU refreshes cursor, cause display highlighting to take unnecessary cpu resource, how a lot of the time that it consumed is more than what we imagined, and this may be very fatal sometimes in the embedded system that the hardware and software resource is all needed to calculate carefully and budget strictly.
[summary of the invention]
Fundamental purpose of the present invention is exactly in order to solve prior art problems, and a kind of device for accelerative displaying cursor is provided, and does not need the repetition write cursor, and has improved the display speed of cursor.
For achieving the above object, the invention discloses a kind of device for accelerative displaying cursor, comprising: video memory is partitioned into independently main screen data storage area and cursor data memory block; The video memory control module is used for the outside is converted into the read-write operation that meets the video memory interface sequence to the read-write requests of video memory; The main screen read module is used for reading the main screen video data that the main screen data storage area of video memory is stored; The cursor read module is used for reading the cursor video data that the cursor data memory block of video memory is stored; Show synthesis module, be used to receive the position coordinates and the current cursor position coordinate of current scanning element, according to the position coordinates of current scanning element and the comparative result of current cursor position coordinate, from main screen video data and cursor video data, select corresponding video data output; And according to the position coordinates of current scanning element, output cursor refresh signal is to handover module; Handover module, the control end response shows the cursor refresh signal of synthesis module output, and input end links to each other with the video memory control module, and output terminal is used for switching between main screen read module and cursor read module according to the cursor refresh signal; Display driver circuit is used to receive the video data that shows synthesis module output, and cooperates the driving clock signal to be mapped on the current pixel of display terminal it.
Further improvement of the present invention is: can store multiple cursor data in the described video memory, described cursor read module receives current cursor ID number, and reads corresponding cursor data according to the ID number appropriate address unit from the cursor data memory block of video memory of this cursor.
Wherein, described demonstration synthesis module is exported the cursor refresh signal flyback time on the scene, and described cursor read module also responds the cursor refresh signal, is used for beginning to read the cursor video data after receiving the cursor refresh signal.
Described cursor read module preferred version is to comprise cursor ID register, address and request generator, and described cursor ID register receives current cursor ID number, and exports address and request generator to; The address signal of cursor data memory block is to the video memory control module in address and request generator output reading request signal and the cursor place video memory, and the Address Confirmation signal that returns of response video memory control module, exports the video memory control module to after cursor address is added 1.
Described cursor read module also further comprises pushup storage, described pushup storage links to each other with the cursor address signal output part of address and request generator, the Address Confirmation signal that response video memory control module is returned, the storage cursor address, and the spacing wave of the data useful signal of response video memory control module output and pushup storage output with computing after signal, output is temporarily stored in the cursor address in the pushup storage.The Address Confirmation signal that is the output of pushup storage usefulness video memory control module is kept in the cursor address of address and request generator output as write signal; And with the data useful signal of video memory control module output as read signal, temporary before address is read, to cooperate the valid data that this moment, the video memory control module was read.
Described display driver circuit detects the position coordinates of current scanning element and outputs to the demonstration synthesis module, comprise also and write register bus that the described register bus of writing is used for current cursor ID number of CPU output and current cursor position coordinate write cursor read module and show synthesis module respectively.
Described handover module preferred version is to comprise selecting the cursor control module and first MUX, described selection cursor control module response cursor refresh signal, and the output terminal of controlling first MUX switches to the cursor read module.Described handover module can also directly be a MUX.
Of the present invention further the improvement is: also comprise the Double Port Random Memory that is connected between cursor read module and the demonstration synthesis module, is used for current cursor data is carried out buffer memory.
The preferred version of described demonstration synthesis module is to comprise that cursor position coordinate register, cursor refresh generator, cursor is read address and read request generator, selected control module, second MUX, main screen to read address and read request generator and main screen and refresh generator; Described cursor position coordinate register receives current cursor position coordinate, and outputs to the selection control module; Described selection control module also responds the position coordinates of current scanning element, output terminal is coupled to the control end of second MUX, be used for when current coordinate enters current cursor dot matrix region, control second MUX and select output cursor video data, otherwise output main screen video data; Described cursor is read address and read request generator output cursor reading request signal and cursor and is read address signal, and the cursor detection signal of response selection control module output, is used for that cursor is read address signal and adds 1 back output; Cursor refreshes the position coordinates that generator responds current scanning element, is used for exporting flyback time on the scene the cursor refresh signal; Described main screen is read the position coordinates that address and read request generator respond current scanning element, and output main screen reading request signal and main screen are read address signal; Described main screen refreshes the position coordinates that generator responds current scanning element, is used for exporting the main screen refresh signal to the main screen read module when beginning to scan.
Wherein, described cursor refreshes that generator is also read the address with cursor and the read request generator links to each other, and the cursor refresh signal that is used for producing exports cursor to and reads address and read request generator, and the value that makes cursor read address signal resets.
The invention has the beneficial effects as follows: 1) the present invention is in the process of display highlighting, CPU only needs required some cursor datas to be write the cursor data memory block of video memory when system initialization, write origin coordinates and the storage address of cursor in video memory that register bus provides current cursor by inside, just cursor can be moved to the assigned address on the screen, and can switch to required cursor shape at any time.In the mobile and conversion process of cursor, do not need CPU to repeat write cursor data in video memory, save cpu resource, and improved the speed and the reaction velocity of cursor display update simultaneously.2) can be with the video data of the cursor of different shape disposable or write video memory, the cursor read module reads cursor as required in batches, has avoided at every turn the cursor data of needs is write video memory, has saved cpu resource.3) the cursor video data reads flyback time on the scene, avoids influencing normally reading continuously of main screen video data, has also guaranteed to have only a cursor in a frame simultaneously.
Feature of the present invention and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is a functional-block diagram of the present invention;
Fig. 2 is the division figure of video memory;
Fig. 3 is a cursor read module functional-block diagram;
Fig. 4 shows the synthesis module functional-block diagram.
[embodiment]
Cursor in specific embodiment one, this programme comprises block cursor, mouse and shows other cursors that embody user's operation by color lump.The hardware principle block diagram of the cursor accelerated method that this programme is realized as shown in Figure 1, video memory control module 2 is used for external module is converted into the read-write operation that meets the video memory interface sequence to the read-write requests of video memory 1, and be optimized according to certain strategy, improve video memory 1 service efficiency; All data in the video memory 1 all are that CPU writes by certain video memory passage of writing; Video memory 1 marks off independently main screen data storage area 12 and cursor data memory block 11, as shown in Figure 2, comprises the video data of difform a plurality of cursors in the cursor data memory block 11 again.The data of corresponding main screen in the video memory 1 (being the pixel data of non-cursor) are read by main screen read module 8, and send in the demonstration synthesis module 9; The data of corresponding cursor are read by cursor read module 6 in the video memory 1, send into to show synthesis module 9; Control switching by a handover module between main screen read module 8 and cursor read module 6 and the video memory control module 2, handover module comprises selects the cursor control module 4 and first MUX 3, cursor control module 4 is according to showing that cursor_newframe (cursor refreshes) signal that synthesis module 9 provides carries out switching controls, when selecting cursor control module 4 to receive the cursor refresh signal that shows synthesis module 9 outputs, control first MUX 3 and switch to cursor read module 6, under other situations, first MUX 3 is connected main screen read module 8; The work that shows synthesis module 9 is the horizontal ordinate (x of the current scanning element that provides according to rear end driver module 10, y) provide corresponding video data data, it is at first according to the position coordinates (x of current scanning element, y) generate cursor_newframe times of signal and be coupled to selection cursor control module 4 and cursor read module 6, control first MUX 3 and connect cursor read module 6, cursor read module 6 reads the cursor video data in certain period of time from video memory 1 simultaneously, then main screen video data and cursor video data are synthesized in self inside, offer driver module 10 afterwards again; Driver module 10 is responsible for producing the required driving clock signal of display screens, and forward end shows that synthesis module 9 provides current location of pixels coordinate x, the y that will show, will show that video data that synthesis module 9 returns sends into screen and go up respective point and show.CPU writes current cursor address value by the independent register bus 5 of writing of a cover to cursor read module 6, and this value is controlled cursor read module 6 and read the cursor video data of appointment in the video memory 1, reaches the purpose of renewal cursor appearance; CPU can also be by writing register bus 5 to showing that synthesis module 9 writes the position coordinate value (being the coordinate in the upper left corner of current cursor) of current cursor, and the position that the control cursor synthesizes on display screen reaches the purpose that changes cursor position.
Below each module of present embodiment is elaborated.
Video memory: in display system in the past, data cell in the video memory be with screen on picture element one to one, CPU will upgrade cursor and just must upgrade the data cell of the new and old cursor of corresponding screen position in the video memory, and this is the major reason that causes CPU inefficiency on display highlighting.In the present invention, the data cell of video memory is additionally marked off one and is specifically designed to the zone of depositing the cursor video data, be called cursor data memory block 11, this zone and the main screen video data corresponding region (being called main screen data storage area 12) in video memory is independently.In the system initialization process, CPU deposits (being cursor 1, the cursor 2...... cursor N of Fig. 2) in the cursor data memory block 11 in by the data of all cursors of writing the video memory passage and will using, in demonstration after this, CPU only needs to write register bus 5 notice cursor read modules by inside and reads the current cursor data that will use from cursor data memory block 11 and get final product, and need not endless to write cursor data to video memory.
Handover module: main screen data storage area 12 and cursor data memory block 11 are read by main screen read module 8 and cursor read module 6 respectively in the video memory, all have between each module and the video memory control module separately read address and control signal, between two groups of read modules and the video memory control module handover module is arranged.Handover module can be to select the cursor control module 4 and first MUX 3, also can be independent MUX.Owing to main screen data in the procedure for displaying that carries out frame data at display screen are read continuously, so cursor data is preferably read in the intermittent phase of frame and frame (being commonly referred to flyback time), so present embodiment is by showing that synthesis module 9 is according to the current scanning element position coordinates (x that receives, y), produce cursor_newframe (cursor refreshes) signal flyback time on the scene, this signal is sent on the one hand and is selected cursor control module 4, controlling first MUX 3 switches on the cursor read module 6, send into cursor read module 6 on the other hand, can start cursor read module 6 and begin from video memory cursor data memory block reading of data; And, showing the invalid cursor_newframe signal of synthesis module 9 outputs in non-flyback time, first MUX 3 is switched to the main screen read module, begins reading continuously of frame data.When handover module was independent MUX, cursor_newframe (cursor refreshes) signal can directly output to the control end of MUX, and MUX is switched between main screen read module and cursor read module.
The cursor read module: its inner principle as shown in Figure 3, after driver module provides the cursor_newframe signal, address and request generator 62 produce cursor_req (read request) signal, and be that the value (cursor_id) of cursor ID register 61 outputs to the address that corresponding light is marked on video memory cursor data memory block on the cursor_addr (cursor address line) according to cursor ID register, when if the video memory control module has been accepted this read request and return address confirmation signal ack, address and request generator 62 can add 1 with cursor address cursor_addr, cursor data is read in request continuously, till a cursor data is run through.Because the video memory steering logic has certain time-delay from returning ack (promptly accepting read request) to returning valid data, and cursor_addr is constantly adding 1, so the better scheme of cursor read module is to increase an address FIFO (pushup storage) the 63 cursor_addr buffer memory of request before, this pushup storage 63 uses Address Confirmation signal ack as write signal, the empty of valid and FIFO (spacing wave) " with " logic is as read output signal, be that pushup storage 63 links to each other with the cursor address signal output part of address and request generator 62, the Address Confirmation signal ack that response video memory control module is returned, the storage cursor address, and the spacing wave empty of the data useful signal valid of response video memory control module output and pushup storage output with computing after signal, output is temporarily stored in the cursor address cursor_addr in the pushup storage.Like this when the video memory steering logic is returned valid data data and valid (being that data are effective), the corresponding address that before deposits FIFO in just and valid data offer the DPRAM of rear end simultaneously.
Show synthesis module: carried out showing synthetic here from the data of main screen read module and cursor read module, its inner principle as shown in Figure 4, (x among the figure, y) be the coordinate of the current scanning element that provides of driver module, show synthesis module then should be immediately from main_rddata (main screen data) and curdp_rddata (cursor is data cached) selection return the video data data of correspondence.Show that synthesis module comprises that cursor position coordinate register 91, cursor refresh generator 92, cursor is read address and read request generator 93, selected control module 94, second MUX 95, main screen to read address and read request generator 96 and main screen and refresh generator 97.Cursor position coordinate register 91 can be write register bus internally and obtain current required cursor threshold value (Xc, Yc) (being the coordinate in the upper left corner in the cursor dot matrix), select control module 94 to select video data data according to the coordinate of this coordinate and current scanning element, concrete system of selection is: when Xc≤x＜Xc+M and Yc≤y＜Yc+N, select cursor video data curdp_rddata to output to data; And in the time of x＜Xc or x 〉=Xc+M or y＜Yc or y 〉=Yc+N, then be chosen as main screen video data main_rddata is outputed to data, wherein M, the N horizontal vertical pixel that is respectively cursor is counted, for specific cursor, the size of cursor all is the same, and M, N are generally 32 * 32 or 16 * 16.In addition, when selecting cursor video data curdp_rddata output, select control module 94 can export cursor_dector (cursor detection) signal simultaneously, the curdp_rdaddr (cursor is read address signal) that this signal makes cursor read address and 93 outputs of read request generator adds 1 output continuously, thereby guarantees the continuous output of cursor data.Cursor refreshes generator 92 according to current scanning element position coordinates (x, y) generate the cursor_newframe signal, this signal can also further be told one the tunnel and output to cursor and refresh generator 92, the value that makes cursor read address signal curdp_rdaddr resets to 0, so that the beginning next round reads the cursor video data.Main screen read the current scanning element of address and read request generator 96 responses position coordinates (x, y), output main screen reading request signal main_rd and main screen are read address signal main_rdaddr; Main screen refreshes the position coordinates of the current scanning element of generator 97 response, and (x, y), output main screen refresh signal main_newframe is to the main screen read module when beginning to scan.
Specific embodiment two, different with specific embodiment one be also to comprise being connected the cursor read module and showing Double Port Random Memory DPRAM between the synthesis module, as shown in Figure 1.Usually adopt the Dot Clock (promptly driving the clock of a point data correspondence on the cutout screen) of display screen owing to show the clock of synthesis module 9 and driver module 10, and other modules of front end adopt the internal clocking (the frequency ratio Dot Clock is high a lot of usually) of system to obtain the high processing ability usually, come current cursor data is carried out buffer memory so add a Double Port Random Memory 7 between cursor read module 6 and demonstration synthesis module 9.In flyback time, current required cursor video data is sent in the Double Port Random Memory 7 by cursor read module 6; And show that in continuous demonstration phase of a frame synthesis module 9 just can obtain cursor data continuously in the needs cursor data from Double Port Random Memory 7, so also guaranteed cursor data can be immediately, the continuous display module that offers shows.
In sum, CPU only need provide coordinate and ID number (being memory address) of cursor, can finish the work of drawing cursor by hardware, has alleviated the burden of CPU software, has obviously accelerated to upgrade the speed of cursor, has improved the resource utilization of system; Extra increase on the hardware is again very small simultaneously, and the hardware cost increase when using FPGA to realize has so just obtained tangible performance boost with small cost only as about 1$, makes total system have higher cost performance.
Has the instrument and equipment of Presentation Function for other, if certain display element on its screen has following two characteristics: the demonstration number of (1) synchronization at most only is one, (2) its position or profile on screen often changes, and so just can use method of the present invention that this display element is carried out hardware-accelerated demonstration.
Claims (10)
1. device for accelerative displaying cursor is characterized in that comprising:
Video memory marks off independently main screen data storage area and cursor data memory block;
The video memory control module is used for the outside is converted into the read-write operation that meets the video memory interface sequence to the read-write requests of video memory;
The main screen read module is used for reading the main screen video data that the main screen data storage area of video memory is stored;
The cursor read module is used for reading the cursor video data that the cursor data memory block of video memory is stored;
Show synthesis module, be used to receive the position coordinates and the current cursor position coordinate of current scanning element, according to the position coordinates of current scanning element and the comparative result of current cursor position coordinate, from main screen video data and cursor video data, select corresponding video data output; And according to the position coordinates of current scanning element, output cursor refresh signal is to handover module;
Handover module, the control end response of this module shows the cursor refresh signal of synthesis module output, and input end links to each other with the video memory control module, and output terminal is used for switching between main screen read module and cursor read module according to the cursor refresh signal;
Display driver circuit is used to receive the video data that shows synthesis module output, and cooperates the driving clock signal to be mapped on the current pixel of display terminal it.
2. device for accelerative displaying cursor as claimed in claim 1, it is characterized in that: described video memory internal memory contains multiple cursor data, described cursor read module receives ID number of current cursor, is used for reading corresponding cursor data according to the ID number appropriate address unit from the cursor data memory block of video memory of this cursor.
3. device for accelerative displaying cursor as claimed in claim 2, it is characterized in that: described demonstration synthesis module is exported the cursor refresh signal flyback time on the scene, described cursor read module also responds the cursor refresh signal, and begins to read the cursor video data after receiving the cursor refresh signal.
4. device for accelerative displaying cursor as claimed in claim 3 is characterized in that: described cursor read module comprises cursor ID register, address and request generator, and described cursor ID register receives current cursor ID number, and exports address and request generator to; The address signal of cursor data memory block is to the video memory control module in address and request generator output reading request signal and the cursor place video memory, and be used for after receiving the Address Confirmation signal that the video memory control module returns, after being added 1, cursor address exports the video memory control module to.
5. device for accelerative displaying cursor as claimed in claim 4, it is characterized in that: described cursor read module also comprises pushup storage, described pushup storage links to each other with the cursor address signal output part of address and request generator, the Address Confirmation signal that response video memory control module is returned, the storage cursor address, and the spacing wave of the data useful signal of response video memory control module output and pushup storage output with computing after signal, output is temporarily stored in the cursor address in the pushup storage.
6. device for accelerative displaying cursor as claimed in claim 1, it is characterized in that: described display driver circuit detects the position coordinates of current scanning element and outputs to the demonstration synthesis module, comprise also and write register bus that the described register bus of writing is used for current cursor ID number of CPU output and current cursor position coordinate write cursor read module and show synthesis module respectively.
7. device for accelerative displaying cursor as claimed in claim 1, it is characterized in that: described handover module comprises selects the cursor control module and first MUX, described selection cursor control module response cursor refresh signal, the output terminal of controlling first MUX switches to the cursor read module.
8. as each described device for accelerative displaying cursor in the claim 1 to 7, it is characterized in that: also comprise the Double Port Random Memory that is connected between cursor read module and the demonstration synthesis module, is used for current cursor data is carried out buffer memory.
9. device for accelerative displaying cursor as claimed in claim 8 is characterized in that: described demonstration synthesis module comprises that cursor position coordinate register, cursor refresh generator, cursor is read address and read request generator, selected control module, second MUX, main screen to read address and read request generator and main screen and refresh generator; Described cursor position coordinate register receives current cursor position coordinate, and outputs to the selection control module; Described selection control module also responds the position coordinates of current scanning element, output terminal is coupled to the control end of second MUX, be used for when current coordinate enters current cursor dot matrix region, control second MUX and select output cursor video data, otherwise output main screen video data; Described cursor is read address and read request generator output cursor reading request signal and cursor and is read address signal, and the cursor detection signal of response selection control module output, is used for that cursor is read address signal and adds 1 back output; Cursor refreshes the position coordinates that generator responds current scanning element, is used for exporting flyback time on the scene the cursor refresh signal; Described main screen is read the position coordinates that address and read request generator respond current scanning element, and output main screen reading request signal and main screen are read address signal; Described main screen refreshes the position coordinates that generator responds current scanning element, is used for exporting the main screen refresh signal to the main screen read module when beginning to scan.
10. device for accelerative displaying cursor as claimed in claim 9, it is characterized in that: described cursor refreshes that generator is also read the address with cursor and the read request generator links to each other, the cursor refresh signal that is used for producing exports cursor to and reads address and read request generator, and the value that makes cursor read address signal resets.
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|---|---|---|---|---|
| EP0422300B1 (en) * | 1989-10-12 | 1994-12-21 | International Business Machines Corporation | Display system with graphics cursor |
| CN2498665Y (en) * | 2001-08-29 | 2002-07-03 | 湖南计算机股份有限公司 | 24 point matrix display processing chip |
| CN1604027A (en) * | 2004-11-08 | 2005-04-06 | 程天宇 | Functional module for controlling cursor movement in electronic devices |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0422300B1 (en) * | 1989-10-12 | 1994-12-21 | International Business Machines Corporation | Display system with graphics cursor |
| CN2498665Y (en) * | 2001-08-29 | 2002-07-03 | 湖南计算机股份有限公司 | 24 point matrix display processing chip |
| CN1604027A (en) * | 2004-11-08 | 2005-04-06 | 程天宇 | Functional module for controlling cursor movement in electronic devices |
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Effective date of registration: 20220406 Address after: No.18 Qinglinghe Road, Qingling City Industrial Park, Hongshan District, Wuhan City, Hubei Province 430065 Patentee after: Wuhan Mindray Technology Co.,Ltd. Address before: 518057 the 1-4 floor of MINDRAY building, science and technology south twelve Road, Nanshan District high tech Industrial Park, Shenzhen, Guangdong. Patentee before: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. Patentee before: Shenzhen Meirui Technology Co., Ltd |
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