CN101526905A - Method for displaying starting up progress of embedded device - Google Patents
Method for displaying starting up progress of embedded device Download PDFInfo
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- CN101526905A CN101526905A CN200910301634A CN200910301634A CN101526905A CN 101526905 A CN101526905 A CN 101526905A CN 200910301634 A CN200910301634 A CN 200910301634A CN 200910301634 A CN200910301634 A CN 200910301634A CN 101526905 A CN101526905 A CN 101526905A
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Abstract
The invention relates to the technique for displaying a startup picture of an embedded device and solves the problems that in the process of starting up the embedded device, latency time is long and nod feedback is displayed on the screen and provides a method for displaying starting up progress of the embedded device. The technical proposal is: the method is characterized by comprising the following steps: a. electrifying the system, starting up a boot loader program, invocating a display function to display the startup picture; b. starting up operating system nucleus, establishing a kernel thread and invocating a progress display function; c. operating the progress display function, displaying corresponding progress bars and percentage number according to available machine time; d. completing system startup and withdrawing the progress display function; the invention has the beneficial effects of offering convenience to the users and being applicable to embedded devices.
Description
Technical field
The present invention relates to embedded device, particularly startup picture.
Background technology
Enter the nineties in 20th century, embedded technology is in full swing, and has become the common development direction of communication and consumer product at present, and along with information-based, intelligent, networked development, embedded system technology also will obtain more wide development space.Real-time multi-task operating system (RTOS) has become the main flow of embedded system, this has determined the embedded device on time to be generally tens seconds or twenties second time, an actionless start-up picture is thought by mistake equipment failure by the user usually, very inconvenience.The embedded device course of work, at first bootstrap loader initiating hardware equipment, set up the mapping graph of memory headroom, take the software and hardware of system to a proper state, for the call operation system kernel is ready to correct environment, because this section program is smaller, this stage takies the time less than one second.Operating system nucleus need be finished a series of loading, startup work, and this stage is set up to file system needs tens second time.
Summary of the invention
Technical matters to be solved by this invention, long in order to solve the embedded device start process stand-by period exactly, screen does not have the problem of feedback, and a kind of method for displaying starting up progress of embedded device is provided.
The present invention solves its technical matters, and the technical scheme of employing is that method for displaying starting up progress of embedded device is characterized in that, may further comprise the steps:
A. system powers on, and bootstrap loader starts, and calls explicit function and shows start-up picture;
B. operating system nucleus starts, and sets up a kernel thread, calls the progress explicit function;
C. progress explicit function operation is according to corresponding progress bar and the number percent numeral of on time demonstration;
D. system start-up is finished, and the progress explicit function withdraws from.
Further, step c may further comprise the steps:
C1. progress explicit function operation;
C2. read frame buffering (following with framebuffer represent-can be in the optional position of Installed System Memory storer, be the mapping of video memory in internal memory, Video Controller comes clear screen by the visit frame buffer) in be positioned at number percent numeral and show ten, the data in zone, individual position;
C3. making up length at the screen correct position is the rectangular strip of L, and L is smaller or equal to screen length;
C4. show " % " symbol;
C5. initializing variable I=0;
C6. whether judge (I+100/C) greater than 100, C is the constant smaller or equal to 100, if then system start-up is finished, withdraws from the progress explicit function, if not then enter the c7 step;
C7. fill the rectangle that length is m from left to right, m=L/C;
C8. hundred of the show percent numeral b, b=I/100;
C9. ten of the show percent numeral s, s=I/10;
C10. the show percent numeral the position g, g=I%10;
C11. stand-by period t returns step c6, t=T/C, and wherein T is the time of first kernel thread to first application program.
Concrete, step c11 is further comprising the steps of:
C11.1. stop ten s and a position g of show percent numeral, be positioned at the number percent numeral among the framebuffer that reads according to the c2 step and show that ten, the data in zone, individual position revert to this color in this position of start-up picture.
The invention has the beneficial effects as follows, can give the user directly perceived, clear, a start process demonstration accurately by above-mentioned steps, to improve user experience, and because before refreshing ten of the number percent numeral, unit numbers at every turn, this field color will be updated to the color of start-up picture itself, and then refresh numeral, can avoid repetition to refresh the numeral that different digital causes a position and show fuzzy.
Description of drawings
Fig. 1 is the system flowchart of embodiment;
Fig. 2 is the progress explicit function workflow diagram of embodiment.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
The invention provides a kind of method for displaying starting up progress of embedded device, at first system powers on, bootstrap loader starts, and calls explicit function and shows start-up picture, and operating system nucleus starts subsequently, set up a kernel thread, call the progress explicit function, the operation of progress explicit function then shows corresponding progress bar and number percent numeral according to the on time, after system start-up was finished, the progress explicit function withdrawed from.
Embodiment
This example is an example with the IPTV set-top box that adopts embedded Linux operating system, and wherein, constant C is an example with 100, its system flowchart such as Fig. 1, its progress explicit function workflow diagram such as Fig. 2.
The course of work of IPTV set-top box integral body is: at first system powers on, bootstrap loader starts, initiating hardware equipment, the explicit function sheet of changing the line map shows start-up picture, copy linux operating system nucleus code is to the RAM of system (Random AccessMemory, random access memory) internal memory, start the linux kernel, the kernel multitask environment is created a new thread after setting up, carry out the start progress explicit function, the loading root file system is finished, and progress shows end simultaneously, and progress shows 100%, executive utility enters standby picture.
Wherein, bootstrap loader (Bootloader) startup is divided into two main processes.First, relate to processor architecture part assembly code part, mainly finish define program inlet, be provided with exception vector, set handling device speed, clock frequency and interrupt control register, initialization Memory Controller Hub, with the program copy among the ROM (read-only memory, ROM (read-only memory)) in RAM, the initialization storehouse, forward among the RAM and carry out.Second, C language part, mainly finished and called a series of initialization function, initialization NANDFLASH equipment, initialization system memory allocation function, initialization related network device, filled in IP, MAC Address etc., initialization display device (framebuffer), show start-up picture, load the linux operating system nucleus.
Wherein, the embedded Linux os starting can be divided into two major parts.First, kernel data structure initialization: called a series of initialization functions in the start_kernel function, to finish the setting of kernel kernel itself, the start_kernel function is last, starts init process (creating first kernel thread), and so far the start_kernel function finishes, basic core environment has been set up, at this moment system has possessed the environment of multitask work, creates at this to show the start progress thread, calls the progress displaying function.The second, the peripheral hardware initialization: bus initialization, netinit starts a series of kernel thread, function, the final act system initialization loads root file system, finishes to this init process, the leader of kernel also leaves it at that, and starts application program under the user model, shows standby picture.
More than be the explanation of system works overall process, below progress explicit function module elaborated.
The system boot progress is on the basis of start-up picture, in the suitable position of screen with colored progress bar, two kinds of forms of number percent numeral, synchronous display system start process.First, colored progress bar display part: the rectangle that to make up a length be L (progress bar is the rectangle in the rectangle normally), make up rectangle top, bottom, the left side, the right respectively, this rectangle defines the viewing area of colored progress bar, according to certain time interval t, filling scale m rectangle is filled, present colored progress bar on the screen, wherein, t=T/100, m=L/100.Second, percentages show part: determine hundred bit value b, ten digit value s, units value g, position, four viewing areas of percentage colon " % ", the position of percentage colon only shows percentage sign " % ", this position transfers the dot array data of " % " to show %, hundred zones show that numerical value is b=I/100, ten zones show that numerical value is s=I/10, viewing area, individual position shows that numerical value is g=I%10, initializing variable I=0 wherein, every time t, variable I increases progressively 100/C (this moment C=100, then increase progressively 1, be I=I+1), refresh one time hundred, ten, 1 to 100 dynamic demonstration is realized in individual position.
Wherein, realizing showing the essence of the progress demonstration that loads, is exactly that direct control framebuffer realizes.The following horizontal direction that adopts is filled on the rectangular shaped rim, vertically fill on limit, the left and right sides, rectangle 320x20 for example, 16 true color, bottom needs 320x2 byte on the rectangle, here the corresponding black of sexadecimal number 0x00, the corresponding white of 0xff, the 0x00-0xff color shoals gradually, selects different numerical value, be filled into the framebuffer assigned address, the screen relevant position will show different colors.
Wherein, the numerical percentage display part, at first to make one and comprise digital 0-9, the dot matrix table of percentage sign %, make rule herein, monochromatic 0/1 dot matrix, data are horizontally-arrangeds, the corresponding position of pixel, 8 corresponding bytes of pixel, the position order of byte is that a left side is high right low, the state of for example horizontal 8 points be " *-----*-" (* is a stain ,-be white point), then Zhuan Huan hexadecimal data is 0x82 (B1000_0010), in this way, 0-9, the sexadecimal that percentage sign % converts to exist in the array (a0[], a1[] ...).Before the display digit, at first read the numerical value of corresponding ten of framebuffer, viewing area, individual position, this numerical value correspondence be start-up picture this in the color value at this place, before ten on each brush, the unit numbers, will be this field color according to the numerical value that before framebuffer is read, be updated to the color of start-up picture itself, and then the brush numeral.
Wherein, according to calculated value,, upgrade the time interval t of progress as Fig. 2 as above-mentioned time T at every turn, t=T/100, because multitask sees that timesharing seizes CPU during os starting, so behind the interval time t, the thread of progress explicit function differs and carries out work surely on time, so need be according to the system start-up real time, suitably adjust the t value, make the t value of actual t value ratio theory little (t=t-t ', t ' chooses suitable value according to the actual startup situation of system).
What progress of the present invention showed is the process of first kernel thread of operating system to first application program launching (tens seconds), and the time of the general 1s of the initial initialized total of bootstrap loader and kernel ignores.
Claims (3)
1. method for displaying starting up progress of embedded device is characterized in that, may further comprise the steps:
A. system powers on, and bootstrap loader starts, and calls explicit function and shows start-up picture;
B. operating system nucleus starts, and sets up a kernel thread, calls the progress explicit function;
C. progress explicit function operation is according to corresponding progress bar and the number percent numeral of on time demonstration;
D. system start-up is finished, and the progress explicit function withdraws from.
2. according to the described method for displaying starting up progress of embedded device of claim 1, it is characterized in that step c may further comprise the steps:
C1. progress explicit function operation;
C2. read and be positioned at the data that the number percent numeral shows ten, individual zones in the frame buffering;
C3. making up length at the screen correct position is the rectangular strip of L, and L is smaller or equal to screen length;
C4. show " % " symbol;
C5. initializing variable I=0;
C6. whether judge (I+100/C) greater than 100, C is the constant smaller or equal to 100, if then system start-up is finished, withdraws from the progress explicit function, if not then enter the c7 step;
C7. fill the rectangle that length is m from left to right, m=L/C;
C8. hundred of the show percent numeral b, b=I/100;
C9. ten of the show percent numeral s, s=I/10;
C10. the show percent numeral the position g, g=I%10;
C11. stand-by period t returns step c6, t=T/C, and wherein T is the time of first kernel thread to first application program
3. according to the described method for displaying starting up progress of embedded device of claim 2, it is characterized in that step c11 is further comprising the steps of:
C11.1. stop ten s and a position g of show percent numeral, be positioned at the number percent numeral in the frame that reads according to the c2 step buffering and show that ten, the data in zone, individual position revert to this color in this position of start-up picture.
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