Design of virtual dashboard based on the SOC with graphic display
Contents
1. lt DX lt w 64 8 bpp bpp 8 or 16 2 0 lt DY lt H 3 DX DY and DA have to indicate the same point within the frame In short the following relationship must be satisfied DA OA DX bpp 8 64w DY bpp 8 or 16 4 2 1 3 Video display control principle Among the six layers layer L1 is specified as video display it can display YCbCr format video signal The YCbCr signal will be transformed to RGB signal and displayed on LCD by configuring correspond registers The conversion between YCbCr and RGB is realized by algorithm shown below R Y Ai Ahn 3 b Gp A4Cb 128 gt b whereA a B Cr 128 Olay ay a b Ay Aye b 3b a d Among which is 11 bits signed real b is 9 bits signed real and b can be set in the following registers LIYCRO a a LIYCRI b a 3 LIYCGO a a LIYCGI b a LIYCBO a 23 LIYCB1 b a3 It is possible to control brightness contrast hue color saturation by changing the matrix parameters 177 Design of virtual dashboard based on the SOC with graphic display controller integrated in Tong Guo xiang Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng 2 2 Software design 2 2 1 General software design The composite information display panel communicates with the main controller module by CAN and the display information is sent by main controller module The operation flow of the whole system is the touch key of the composite information display panel se2. Design of virtual dashboard based on the SOC with graphic display controller integrated in Tong Guo xiang Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng Design of virtual dashboard based on the SOC with graphic display controller integrated in i Tong Guo xiang 3 Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng School of Optical Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China leaf62 163 com Shanghai Key Laboratory of Modern Optical System Shanghai 200093 China guoxiangtong 163 com ShangHai Jingxi Electronics Information System Co Ltd 1 2 3 Abstract With the rapid development of automotive electronics traditional analogue instruments techniques can not meet the requirements of modern vehicles so there exists digital virtual instruments A virtual dashboard is presented in this paper which integrated electronic rearview mirror navigation and location system information monitor entertainment and operation records by using digital process techniques and high precision color display technology Besides it has small size low power consumption and easy installation The virtual meter has uniformly divided dial high precision and non jitter pointer indication and quick response Keywords Embedded system Virtual dash board SoC 1 Introduction Instrument is very important interface for drivers to communicate with the vehicle it is the important guarantee
3. d based on the SOC with graphic display controller integrated in Tong Guo xiang Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng object 3 Test and conclusion Testing and experiment proves that the virtual meter presented in this paper has high precision and non jitter pointer indicating and has quick response also meets the relevant standards so that deserving extensive use The whole system operating well and has quick response to the modules switch commands Testing result is shown as figure 6 there only gives the dashboard page the composite information display panel receives information from the main controller module though CAN and responses accordingly Figure 6 Testing result This virtual dashboard uses layer L1 L3 L4 L5 of the six layers Among which the speed meter current temperature gears left cornering lamp right cornering lamp and ODO are placed at layer L1 buttons including navigation button air condition button and media button are placed at layer L3 pointer vector is placed at layer L4 and background picture is placed at layer L5 The air condition multi media and navigation are placed on different pages 4 Acknowledgements Supported by Innovation Program of Shanghai Municipal Education Commission Grant No 12YZ094 and we would like to thank to Fujitsu for technology supporting 5 References 1 Wan fu Zheng Long ping Zhong Jian qing Chen Wen xiang Chen A Research on Graphical Interfacia
4. e created To realize the rotation of the pointer an algorithm is adopted that is draw the triangle again at the place where it tends to rotate and clear the original triangle Specifically we need to calculate the angle which the triangle will be turned round next the three vertexes coordinates value of the triangle should be calculated according to the angle mentioned in the last step finally call the draw triangle function again so that we can get a rotation pointer As shown in figure 5 horizontal axis is Y axis vertical axis is X axis PO P1 and P2 represent the three vertexes respectively and coordinate cx cy represents the center of the meter L1 represents the distance from the center of the meter to the start of the pointer and LO represents the distance from the center of the meter to the end of the pointer Then the coordinates of the three vertexes PO P1 and P2 can be calculated by P 0 x cx sin_d LO 0x10000 P 0 y cy cos_d LO 0x10000 5 P 1 x cx sin_d L1 0x10000 dx0 178 Design of virtual dashboard based on the SOC with graphic display controller integrated in Tong Guo xiang Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng P 1 y cy cos_d L1 0x10000 dy0 6 P 2 x cx sin_d L1 0x10000 dx1 P 2 y cy cos_d L1 0x10000 dy1 7 Firstly a sine table should be defined as there must use sine function the sin_table corresponds
5. ely to realize multi use of one machine Drivers can easily use each function by touching correspond button on the panel besides it can real time update the display pages 2 Hardware structure The information display panel presented in this paper adopted JADE LC as the core control chip It s a SOC single chip which integrates ARM926EJ S as CPU and MB86296 GDC produced by Fujitsu as graphic display controller thus it will take the place of the previous system structure which needs two chips including a MCU and a GDC for lower cost and better performance In order to realize the function as a vehicle s virtual instruments composite information system GDC is placed as the core module and the peripheral function modules should include 1 Power supply module provide power for GDC core and peripheral function modules 2 Analogue video input module convert analogue video input to digital video signal and transfer International Journal of Digital Content Technology and its Applications JDCTA Volume6 Number6 April 2012 doi 10 4156 jdcta vol6 issue6 21 3 4 5 6 Design of virtual dashboard based on the SOC with graphic display controller integrated in Tong Guo xiang Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng the digital signal to main chip that is JADE LC CAN drive module communicate with the outside of the system receive the status information of car and control signals UART module communica
6. for safety driving as it provides necessary operation parameters malfunction warming mileage information and so on The instruments location and display must be designed according to human body engineering and their outline must be graceful With more and more electronic devices are installed in luxury cars there exists more and more information that need to deal with and the traditional analogue instruments can not fulfill the requirements any more hence the digital instruments are the tendency Lots of large software manufacturers are beginning to research in this filed and design intelligent information display panel with car manufacturers and bring this application which was first used in aviation and military into automotive industry This kind of digital virtual meters are being tested in some luxury cars of Rover and Chevrolet But to make virtual meters the whole car s information hub and realize man machine interaction it needs much hard work and continued efforts A kind of virtual dashboard based on Fujitsu s SOC ARM9 Graphic display controller is presented in this paper and it has functions as follows display control of car s status information such as electronic meter rearview video tachometer operation record alarm and turn instructions and the dash board can be ordered flexibly by demands multimedia function vehicle audio and navigation function which are integrated in system and can be controlled intensiv
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8. nds request information to the main controller module and the main controller module judges the current status then respond request sent by display panel that is send the page switching command or display information accordingly to the display panel at last the panel displays the information sent by the main controller module Besides some display contents need real time update therefore the main controller module send real time information to display panel with regular time interval after receiving these information the display panel updates the current status information and display it The state graph of software operation is shown as figure 3 page swift request key press request air condition navigation send messag regularly display refresh request 2 display refresh request speedometer tachometer fuel meter water thermo meter regularly send messag regularly a current temperature current album current song current singer Figure 3 Software operation state graph 2 2 2 Control of the meter s pointer The pointer of the virtual meter presented in this paper is represented by triangle All kinds of triangles can be set by using GDC image library Call the draw triangle function from GDC library and set the two dimensional coordinates of the triangle s three vertexes as the passed parameters then a required triangle will b
9. te with the devices outside the system Touch panel drive module control touch panel and transfer the input information of touch panel to main chip JADE LC LCD drive module drive LCD and is used for display information of each page including the information of meter air condition multi media DVD navigation and rearview mirror The structure block diagram of hardware is shown as figure 1 outside system device Power module CoN DDR2 drive module module DVD Z UART module GPS gt FLASH module module GDC main module Video gt input module t Touch LCD panel drive drive module module Touch LCD panel Figure 1 Hardware structure block diagram 2 Software control principle 2 1 Display control principle 2 1 1 Layers Layer is the fundamental element of the display page and on which several objects including text list object image list object animation list object SVG object vector graphics object and video object can be placed Fujitsu s GDC provided a display window with up to 6 layers LO to L5 and each page has 6 layers All the layers can be displayed overlaid The overlay sequence of the LO to L5 layers can be changed arbitrarily Particularly layer L1 is specified as video display layer The overlay position for the hardware cursors is above below the LO layer Source pixel and target pixel is mixed according to Alpha mixt
10. to the sine value O 1 from 0 angle to 90 angle and for convenient calculation all the value of the sin_table are multiplied by FFFFH hence when calculating the value of the coordinates 0x 10000 should be divided by to get the actual value In addition an approximate algorithm is adopted in calculating the coordinates of P1 and P2 that is calculate the midpoint coordinate in between the P1 and P2 then add the offsets dx and dy These offsets are deferential value calculated based on the 45 angel boundary Figure 4 Pointer s vectogram The main control software flow chart of the meter s pointer is shown as below start initiate hardware GHC project has been loaded timer has been setted Y initiate project unload project set parameters draw meter and bar Figure 5 Pointer s software flow chart 5 main GHC API functions are used during the drawing of the meter GhcPrimitiveList_FanModeDraw This function draws a 2D primitive drawing with Fan mode GhcObjectList_clearParticularArea This function clears the selected object list and fills the area by transparent color or specified color GhcObjectList_SetDimension This function sets a new dimension for the object GhcObjectList_drawAt This function draws the on the layer GhcObjectList_getPosition This function returns the top left corner coordination of the selected 179 Design of virtual dashboar
11. ure vector on each layer and ordered by setting Z coordinate sequence at last formed the pages we saw 6 7 The six layers window display is shown as below 176 Design of virtual dashboard based on the SOC with graphic display controller integrated in Tong Guo xiang Wang Jing zhao Li Yi Zhu Zhen ning Shen Meng LO Lowx LowyY L4 L4wx Lawy L2 L2wx L2wy L5 Lawx Lswy L1 LiwxLiwy background color L3 Lawx Lawy Figure 2 Six layers window display 2 1 2 Layer display control principle The image data was placed in the logic parallel two dimensional space of the graphic buffer There are six logic graphic buffers correspond to six layers and are mapped to display position through parameter OA Origin Address W Stride H Height DA Display address and DX DY Display position MB86296 scans the logical graphics space as if the entire space is rolled over in both the horizontal and vertical directions Using this function if the display frame crosses the border of the logical graphics space the part outside the border is assumed covered with the other side of the logical graphics space The expression of the X and Y coordinates in the frame and their corresponding linear addresses in bytes is shown as below A x y x bpp 8 64wy bpp 8 or 16 1 The origin of the displayed coordinates has to be within the frame To be more specific the parameters are subject to the following constraints 0
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