CN112085645A - Image acceleration implementation method based on embedded processor - Google Patents
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Abstract
The invention discloses an image acceleration realization method based on an embedded processor, which comprises the following steps: changing task priority; creating a vehicle speed and rotating speed pointer display processing task, and setting the priority of the vehicle speed and rotating speed pointer display processing task to be higher than the priority of a common UI (user interface) display task and lower than the priority of a real-time data processing task; allocating a first video memory for displaying common UI content from the memory; allocating a second video memory for displaying the pointer from the memory; separating a vehicle speed and rotating speed pointer resource from a common UI picture resource, storing the common UI picture resource at one position in a ROM, storing the pointer resource at another fixed position in the ROM, and displaying a processing task by a vehicle speed and rotating speed pointer for use; writing pointer processing task initialization content; opening and displaying the mixture of the second layer and the third layer; a memory data sharing area is added, and the data analysis task writes the analyzed vehicle speed and rotation speed data into the sharing area; and performing pointer loop processing.
Description
Technical Field
The invention relates to the technical field of intelligent mobile communication terminals and mobile internet, in particular to an image acceleration implementation method based on an embedded processor.
Background
A Micro Control Unit (MCU), also called a Single Chip Microcomputer (Single Chip Microcomputer) or a Single Chip Microcomputer (MCU), is a Chip-level computer formed by properly reducing the frequency and specification of a Central Processing Unit (CPU), and integrating peripheral interfaces such as a memory, a counter, a USB, an a/D conversion, a UART, a PLC, a DMA, etc., and even an LCD driving circuit on a Single Chip, and performing different combination control for different applications. Such as mobile phones, PC peripherals, remote controls, to automotive electronics, industrial stepper motors, robotic arm controls, etc., see the silhouette of the MCU.
The problem that the performance of the current embedded MCU can not meet the requirements of real-time performance and high frame rate refreshing at the same time. The solution of a typical on-board system is to use two MCUs, one for real-time processing and the other for graphical interface processing. However, this method is costly and the stability and real-time performance of data transmission are affected (hard-wired communication between MCUs). Moreover, according to the characteristics of the automobile instrument, the contents displayed on the UI interface comprise symbol pieces, the speed, the rotating speed, the character alarm, the air pressure and the like, and the refreshing rate of 25 frames per second can completely meet the requirements of all contents except the speed and rotating speed pointer. Thus, vehicle speed pointer refresh is isolated from other content on the UI. Different refreshing frequencies (the pointer is 60fps, and the other 25fps) are used, so that the purposes of saving cost and enhancing the stability and the real-time performance of the instrument can be achieved.
With the use of the smart mobile communication terminal and the mobile internet, people can request various video programs (movies, television shows, art programs, video news, videos uploaded by net friends, and the like) through different content provider websites. Only the current high mobile internet traffic fee and the mobile communication signal weak area and blind area widely existing outside the city range make people unable to use the function of the mobile communication terminal at will.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an image acceleration implementation method based on an embedded processor, which can solve the problem that the real-time processing and high-frame-rate image refreshing of a vehicle-mounted system cannot be simultaneously met due to limited embedded MCU resources.
In order to achieve the above object, the present invention provides an image acceleration implementation method based on an embedded processor, which comprises the following steps: changing the task priority to ensure that the real-time data processing task priority is the highest, and the common UI display task priority is the lowest; creating a vehicle speed and rotating speed pointer display processing task, and setting the priority of the vehicle speed and rotating speed pointer display processing task to be higher than the priority of a common UI (user interface) display task and lower than the priority of a real-time data processing task; allocating a first video memory for displaying common UI content from the memory, and setting the format and size of the display content; allocating a second video memory for displaying the pointer from the memory, and setting the format and size of the display content of the second video memory; separating a vehicle speed and rotating speed pointer resource from a common UI picture resource, storing the common UI picture resource at one position in a ROM, using the common UI picture resource by a special UI processing tool, storing the pointer resource at another fixed position in the ROM, and displaying a processing task by a vehicle speed and rotating speed pointer for use; writing pointer processing task initialization content, wherein common UI picture resources stored in a ROM are decompressed into the RAM, then a video memory is initialized, a first video memory for displaying common UI content is displayed on a second layer, a second video memory for displaying a pointer is displayed on a third layer, wherein the second layer and the third layer are MCU display layers, and the third layer is displayed on the second layer; opening and displaying the mixture of the second layer and the third layer; a memory data sharing area is added, and the data analysis task writes the analyzed vehicle speed and rotation speed data into the sharing area so that a pointer processing task can read the data; and performing pointer loop processing.
In one embodiment of the present invention, the pointer loop processing includes the steps of: acquiring a vehicle speed and rotating speed value transmitted by the data analysis task, converting the vehicle speed and rotating speed value into an angle value, and acquiring a coordinate value according to a display position; adding a pointer angle offset PID algorithm to achieve the effect of pointer angle gradual change; rotating the pointer to a specified position in the video memory of the third layer by using a pointer rotation algorithm; and waiting for the interruption of the LCD vertical synchronizing signal, refreshing the content of the pointer into a display memory after waiting for the interruption signal, displaying the pointer, and finishing the pointer processing cycle.
In one embodiment of the present invention, the display format of the first video memory for displaying the normal UI content is set as Index8, the display is performed on the whole screen, and the refresh rate is 25fps, so as to be used for displaying pictures, symbol pieces, text alarms, air pressure or menu content on the vehicle instrument interface.
In one embodiment of the present invention, the display format of the second video memory for displaying the pointer is set to RGB888, and the refresh rate is set to 60 fps.
In an embodiment of the present invention, all the pixels on the third layer have a transparency value, the value range of the transparency value is 0 to 255, when the transparency value is 0, the second layer is in a fully transparent state, and when the transparency value is 255, the second layer is in a fully opaque state, and only the third layer is displayed.
In one embodiment of the present invention, the opening of the second layer and the third layer comprises the following steps: and enabling a pixel transparency mixing function of the third layer, and initializing a display buffer of the third layer for displaying the pointer to be transparent so as to display the content of the common UI in an area without the pointer.
In an embodiment of the present invention, the real-time data processing task includes an input/output processing task, a CAN message processing task, and a data parsing task.
In one embodiment of the present invention, the general UI display task includes menus, alarm information, diagnosis information, image contents of historical failures.
Compared with the prior art, the image acceleration implementation method based on the embedded processor has the following beneficial effects: the image acceleration implementation method based on the embedded processor displays the speed and rotating speed pointer and other contents on the UI layer by layer, further realizes different refreshing frequencies by using different MCU display memories, can customize the size of the pointer display memory, adjusts the size of the display memory according to the display area of the pointer, and achieves the purpose of saving the display memory. The priority of the pointer refreshing task is higher than that of a common UI interface, and therefore the real-time performance of the vehicle speed and the rotating speed is guaranteed. And the pointer layer is arranged on the upper part of the common UI layer and is used for performing transmission processing, and then displaying other contents with low refresh rate.
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FIG. 1 is a flowchart of an embedded processor-based image acceleration implementation method according to an embodiment of the present invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1, the method for implementing image acceleration based on embedded processor according to the preferred embodiment of the present invention includes the following steps:
step 1, changing task priority to enable the real-time data processing task priority to be the highest, and enabling a common UI to display the task priority to be the lowest.
And 2, creating a vehicle speed and rotating speed pointer display processing task, and setting the priority of the vehicle speed and rotating speed pointer display processing task to be higher than the priority of the common UI display task in the step 1 and lower than the priority of the real-time data processing task. And then the purpose that the real-time performance is not influenced and the refreshing is faster than that of the common UI is realized.
And 3, allocating a first video memory 1 for displaying the common UI content from the memory, and setting the format and size of the display content.
And 4, allocating a second video memory 2 for displaying the pointer from the memory, and setting the format and the size of the display content of the second video memory. Different video memory sizes and formats can be allocated according to the actual total memory size so as to achieve the purpose of saving the memory.
And 5, separating the vehicle speed and rotating speed pointer resource from the common UI picture resource, storing the common UI picture resource at one position in the ROM, using the common UI picture resource by a special UI processing tool (the common UI picture resource is realized by a single UI task), storing the pointer resource at another fixed position in the ROM, and using the vehicle speed and rotating speed pointer to display the processing task.
And 6, writing pointer processing task initialization content, wherein the common UI picture resources stored in the ROM are decompressed into the RAM, then initializing a video memory, displaying a first video memory for displaying the common UI content on a second layer, and displaying a second video memory for displaying a pointer on a third layer, wherein the second layer and the third layer are MCU display layers, and the large number is displayed on the MCU display layers, namely the third layer is displayed on the second layer.
And 7, opening and displaying the mixture of the second layer and the third layer.
And 8, adding a memory data sharing area, and writing the analyzed vehicle speed and rotation speed data into the sharing area by the data analysis task so as to facilitate the pointer processing task to read the data.
And 9, performing pointer circulation processing.
In an embodiment of the present invention, the pointer loop processing in step 9 specifically includes the following steps: and acquiring a vehicle speed and rotating speed value transmitted by the data analysis task, converting the vehicle speed and rotating speed value into an angle value, and acquiring a coordinate value according to the display position. And a pointer angle offset PID algorithm is added to achieve the effect of pointer angle gradual change and prevent pointer discontinuity caused by large-span angle offset of the pointer. And rotating the pointer to a specified position in the video memory of the third layer by using a pointer rotation algorithm, and recording the positions and corresponding pointer data. Waiting for the interruption of the LCD vertical synchronizing signal, refreshing the pointer content to the display memory after waiting for the interruption signal, and displaying the pointer. The pointer processing loop ends.
In one embodiment of the present invention, the display format of the first video memory for displaying the normal UI content is set as Index8, the display is performed on the whole screen, and the refresh rate is 25fps, so as to be used for displaying pictures, symbol pieces, text alarms, air pressure or menu content on the vehicle instrument interface. The part has large content, low refresh rate and high coding difficulty, and is realized by using a special UI tool.
In one embodiment of the present invention, the display format of the second video memory for displaying the pointer is set to RGB888, and the refresh rate is set to 60 fps. The content of the part is small, the task processing is single, the coding is simple, the data processing capacity is small, and the method is very suitable for using a plurality of special algorithms to achieve the purpose of achieving high refresh rate with low CPU occupancy rate.
In an embodiment of the present invention, all the pixels on the third layer have a transparency value, the value range of the transparency value is 0 to 255, and the larger the data is, the lower the transparency of the third layer is. When the transparency value is 0, the display is in a fully transparent state, and only the content on the second layer is displayed, and when the transparency value is 255, the display is in a fully opaque state, and only the content on the third layer is displayed.
In one embodiment of the present invention, the opening of the second layer and the third layer comprises the following steps: and enabling the transparency mixing function of the pixel points on the third layer, and initializing the display buffer on the third layer for displaying the pointer to be transparent, so that the content of the common UI is displayed in the area without the pointer, and the aim that the pointer and the common UI can be normally displayed is fulfilled.
In an embodiment of the present invention, the real-time data processing task includes an input/output processing task, a CAN message processing task, and a data parsing task.
In one embodiment of the present invention, the general UI display task includes image contents such as menus, alarm information, diagnosis information, and historical malfunctions.
In summary, the image acceleration implementation method based on the embedded processor of the invention not only realizes real-time performance and stability, but also meets a higher refresh rate on a single chip. By analyzing the display characteristics of the vehicle-mounted instrument, the high-refresh-rate image and the low-refresh-rate image on the screen are analyzed, and then the purpose of good display effect is achieved at the embedded MCU through lower MCU resource consumption. Because the real-time processing logic and the display are both on one chip, the cost is saved, the communication between chips is avoided, the system stability is improved, and the coding difficulty is reduced.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (8)
1. An image acceleration implementation method based on an embedded processor is characterized by comprising the following steps: changing the task priority to ensure that the real-time data processing task priority is the highest, and the common UI display task priority is the lowest; creating a vehicle speed and rotating speed pointer display processing task, and setting the priority of the vehicle speed and rotating speed pointer display processing task to be higher than the priority of the common UI display task and lower than the priority of the real-time data processing task; allocating a first video memory for displaying common UI content from the memory, and setting the format and size of the display content; allocating a second video memory for displaying the pointer from the memory, and setting the format and size of the display content of the second video memory; separating a vehicle speed and rotating speed pointer resource from a common UI picture resource, storing the common UI picture resource at one position in a ROM, using the common UI picture resource by a special UI processing tool, storing the pointer resource at another fixed position in the ROM, and displaying a processing task by a vehicle speed and rotating speed pointer for use; writing pointer processing task initialization content, wherein the common UI picture resources stored in a ROM are decompressed into the RAM, then initializing a video memory, displaying a first video memory for displaying common UI content on a second layer, and displaying a second video memory for displaying a pointer on a third layer, wherein the second layer and the third layer are MCU display layers, and the third layer is displayed on the second layer; opening and displaying the mixture of the second layer and the third layer; a memory data sharing area is added, and the data analysis task writes the analyzed vehicle speed and rotation speed data into the sharing area so that a pointer processing task can read the data; and performing pointer loop processing.
2. The embedded processor-based image acceleration implementation method of claim 1, wherein the performing pointer loop processing comprises the steps of: acquiring a vehicle speed and rotating speed value transmitted by a data analysis task, converting the vehicle speed and rotating speed value into an angle value, and acquiring a coordinate value according to a display position; adding a pointer angle offset PID algorithm to achieve the effect of pointer angle gradual change; rotating the pointer to a specified position in the video memory of the third layer by using a pointer rotation algorithm; and waiting for the interruption of the LCD vertical synchronizing signal, refreshing the content of the pointer into a display memory after waiting for the interruption signal, displaying the pointer, and finishing the pointer processing cycle.
3. The embedded processor-based image acceleration realization method of claim 1, characterized in that the display format of the first video memory for displaying normal UI content is set as Index8, full screen display, refresh rate is 25fps, for displaying picture, symbol slice, text alarm, air pressure or menu content on the vehicle instrument interface.
4. The embedded processor-based graphics acceleration implementation method of claim 1, wherein the display format of the second video memory for displaying the pointer is set to RGB888, and the refresh rate is set to 60 fps.
5. The image acceleration implementation method based on the embedded processor as claimed in claim 1, wherein all the pixels on the third layer have a transparency value, the value range of the transparency value is 0-255, when the transparency value is 0, the second layer is in a fully transparent state, and only the content on the second layer is displayed, and when the transparency value is 255, the second layer is in a fully opaque state, and only the content on the third layer is displayed.
6. The embedded processor-based image acceleration implementation method of claim 1, wherein the opening of the mixture of the second layer and the third layer comprises the steps of: and enabling a pixel transparency mixing function of the third layer, and initializing a display buffer of the third layer for displaying the pointer to be transparent so as to display the content of the common UI in an area without the pointer.
7. The embedded processor-based image acceleration implementation method of claim 1, wherein the real-time data processing tasks include input-output processing tasks, CAN message processing tasks, and data parsing tasks.
8. The embedded processor-based image acceleration realization method of claim 1, wherein the general UI display task includes menu, alarm information, diagnosis information, image contents of historical failures.
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