CN111870939A - Semaphore event-based joystick serial port drive design method under vxworks system - Google Patents
Semaphore event-based joystick serial port drive design method under vxworks system Download PDFInfo
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- CN111870939A CN111870939A CN202010657352.XA CN202010657352A CN111870939A CN 111870939 A CN111870939 A CN 111870939A CN 202010657352 A CN202010657352 A CN 202010657352A CN 111870939 A CN111870939 A CN 111870939A
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
- A63F13/00—Video games, i.e. games using an electronically generated display having two or more dimensions
- A63F13/40—Processing input control signals of video game devices, e.g. signals generated by the player or derived from the environment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/10—Program control for peripheral devices
- G06F13/102—Program control for peripheral devices where the programme performs an interfacing function, e.g. device driver
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
- G06F3/0383—Signal control means within the pointing device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4411—Configuring for operating with peripheral devices; Loading of device drivers
Abstract
The invention belongs to the technical field of vxworks systems, and particularly relates to a semaphore event-based joystick serial port drive design method in a vxworks system. The method comprises the following steps: reading the configuration information of the serial port of the operating lever; initializing a serial port equipment use environment; analyzing serial port data to obtain force-sensitive adjusting coordinates sent by the operating lever; setting a screen coordinate reporting event according to the semaphore; compared with the prior art, the invention provides the joystick serial port drive based on the semaphore event by transmitting the force sensitive coordinates of the joystick through the semaphore event according to the serial port data characteristics of the joystick device and aiming at the system platform characteristics under the application scene that the system is vxworks. The invention simplifies the loading process of the joystick serial port drive, converts the joystick movement event into a semaphore event aiming at the data characteristic of the joystick serial port, and provides a screen coordinate interface for an upper application program.
Description
Technical Field
The invention belongs to the technical field of vxworks systems, and particularly relates to a semaphore event-based joystick serial port drive design method in a vxworks system.
Background
The vxwork operating system is an embedded operating system, and the WindML graphic library programming is a main means for developing graphics and human-computer interaction interfaces under vxworks. The joystick is used as a common input device in a weapon system, and the direction control of the upper part, the lower part, the left part and the right part is realized by pulling a handle of the joystick for a certain angle.
In order to enable the joystick device to be normally used as a serial device in a vxworks system, the problem of serial driving of the joystick needs to be solved. The current mature joystick driving technology is realized based on a windows multi-pointer, joystick equipment is used as a standard serial port driver of a low-level input driver using system, the content of the driver uses a high-level input driver, and the same driving design is carried out on a joystick of a serial port by simulating a windows message mechanism of a ps/2 mouse; the above approach does not provide a screen coordinate interface for upper layer applications for joystick movement events, while also limiting the type of joystick device that the system has access to.
In order to solve the joystick serial port drive problem under the vxwork and simplify the drive event process, a joystick serial port drive design method needs to be provided.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to provide a design method for a serial port drive of a lower joystick of a vxworks system.
(II) technical scheme
In order to solve the technical problem, the invention provides a semaphore event-based joystick serial port drive design method in a vxworks system, which comprises the following steps:
step 1: reading the configuration information of the serial port of the operating lever;
step 2: initializing a serial port equipment use environment;
and step 3: analyzing serial port data to obtain force-sensitive adjusting coordinates sent by the operating lever;
and 4, step 4: setting a screen coordinate reporting event according to the semaphore;
through the steps, the serial port driving function of the joystick under the vxwork system can be realized.
Wherein the step1 is as follows: and reading information about the serial port number and the baud rate of the joystick in the root directory of the vxworks system.
In step1, a file object pointer is created first, and file contents are read from the first character of the configuration file; and then, acquiring the port number and the baud rate information corresponding to the keyword according to the character string defined by the comparison macro.
Wherein, in the implementation process of the step 2:
firstly, in equipment connected with a vxworks system, a serial port equipment descriptor communicated with a control rod is appointed;
secondly, opening serial port equipment communicated with the operating rod through a vxworks system function;
then, configuring baud rate and check bit parameters of the serial port;
and finally, establishing a serial port receiving task and receiving the serial port data of the operating rod.
Wherein the step2 comprises:
step 21: acquiring a serial port device descriptor;
step 22: opening the serial equipment represented by the serial equipment descriptor by using a vxworks system function open, and storing an operation handle pointed by the serial;
step 23: configuring the baud rate and the check attribute of the serial device by using an ioctl function;
step 24: creating a serial port receiving task;
step 25: the serial port receiving task circularly uses the ioctl function to judge whether new data are received by the serial port or not; and when the receiving length is larger than zero, reading the serial port data by using a read function.
Wherein, in the implementation process of the step 3:
firstly, receiving a task through a serial port, and acquiring the content of a mobile event data message sent by a control rod device;
then, carrying out validity verification on the mobile event data message, and carrying out sliding window processing on an illegal message to reduce the packet loss rate of serial port data; if the message is legal, acquiring force-sensitive adjusting coordinates (x, y) of the operating lever relative to the central point in the data content;
finally, a force sensitive adjustment coordinate semaphore is sent.
Wherein the step3 comprises:
firstly, a serial port receiving task is created to obtain the mobile event data message content of the serial port.
Then, the mobile event data message is subjected to legality check to obtain the correct force-sensitive adjustment coordinate of the operating lever, and the specific steps are as follows:
step 31: storing all serial port data received this time to a temporary array Temp;
step 32: sequentially processing each data in the temporary array Temp, and counting the total number count of legal data:
a: when the total count is the number of the frame headers, judging whether the frame headers meet the requirements, storing the frame headers into a buffer array, and if not, setting the total count to be 1 to continue processing the subsequent data;
b: when the total count is the frame length, judging whether the frame end and the checksum meet the requirement, if so, calculating the force-sensitive adjusting coordinate (x, y) of the operating rod, and setting the total count to be 0, otherwise, continuously searching a second frame head from the first frame head position z1 to the position pointed by the total count in the buffer array: if the frame length is found, all data after the position z2 of the second frame header are shifted to the array header, and the frame length minus z2 is assigned to count; if not found, setting the count to 1;
step 33: judging whether the number of processed serial port data is smaller than the number of the serial port data received this time, if so, continuing the processing, and if not, exiting the loop;
finally, the force-sensitive adjustment coordinate semaphore is sent using the system function SemGive.
Wherein, in the implementation process of the step 4:
firstly, acquiring a force-sensitive adjusting coordinate semaphore;
then, judging whether a data pointer transmitted by the upper application is empty;
and finally, assigning the coordinate point to a data structure pointer transmitted by the application program.
Wherein the step4 comprises:
firstly, acquiring a force-sensitive adjusting coordinate semaphore by using a system function semTake; then, judging whether a data pointer transmitted by the upper application is null, and if the data pointer is null, returning to 0; and if not, assigning the coordinate point to a data structure pointer transmitted by the upper-layer application program and returning to 1.
The method is used for solving the problem of operating rod serial port driving under a vxworks platform.
(III) advantageous effects
Compared with the prior art, the invention provides the joystick serial port drive based on the semaphore event by transmitting the force sensitive coordinates of the joystick through the semaphore event according to the serial port data characteristics of the joystick device and aiming at the system platform characteristics under the application scene that the system is vxworks. The invention simplifies the loading process of the joystick serial port drive, converts the joystick movement event into a semaphore event aiming at the data characteristic of the joystick serial port, and provides a screen coordinate interface for an upper application program.
Drawings
Fig. 1 is a flow chart of the implementation of the joystick serial port drive.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to solve the problems in the prior art, the invention provides a method for designing a serial port drive of a joystick based on a semaphore event in a vxworks system, as shown in fig. 1, the method comprises the following steps:
step 1: reading the configuration information of the serial port of the operating lever;
step 2: initializing a serial port equipment use environment;
and step 3: analyzing serial port data to obtain force-sensitive adjusting coordinates sent by the operating lever;
and 4, step 4: setting a screen coordinate reporting event according to the semaphore;
through the steps, the serial port driving function of the joystick under the vxwork system can be realized.
Wherein the step1 is as follows: and reading information about the serial port number and the baud rate of the joystick in the root directory of the vxworks system.
In step1, a file object pointer is created first, and file contents are read from the first character of the configuration file; and then, acquiring the port number and the baud rate information corresponding to the keyword according to the character string defined by the comparison macro.
Wherein, in the implementation process of the step 2:
firstly, in equipment connected with a vxworks system, a serial port equipment descriptor communicated with a control rod is appointed;
secondly, opening serial port equipment communicated with the operating rod through a vxworks system function;
then, configuring baud rate and check bit parameters of the serial port;
and finally, establishing a serial port receiving task and receiving the serial port data of the operating rod.
Wherein the step2 comprises:
step 21: acquiring a serial port device descriptor;
step 22: opening the serial equipment represented by the serial equipment descriptor by using a vxworks system function open, and storing an operation handle pointed by the serial;
step 23: configuring the baud rate and the check attribute of the serial device by using an ioctl function;
step 24: creating a serial port receiving task;
step 25: the serial port receiving task circularly uses the ioctl function to judge whether new data are received by the serial port or not; and when the receiving length is larger than zero, reading the serial port data by using a read function.
Wherein, in the implementation process of the step 3:
firstly, receiving a task through a serial port, and acquiring the content of a mobile event data message sent by a control rod device;
then, carrying out validity verification on the mobile event data message, and carrying out sliding window processing on an illegal message to reduce the packet loss rate of serial port data; if the message is legal, acquiring force-sensitive adjusting coordinates (x, y) of the operating lever relative to the central point in the data content;
finally, a force sensitive adjustment coordinate semaphore is sent.
Wherein the step3 comprises:
firstly, a serial port receiving task is created to obtain the mobile event data message content of the serial port.
Then, the mobile event data message is subjected to legality check to obtain the correct force-sensitive adjustment coordinate of the operating lever, and the specific steps are as follows:
step 31: storing all serial port data received this time to a temporary array Temp;
step 32: sequentially processing each data in the temporary array Temp, and counting the total number count of legal data:
a: when the total count is the number of the frame headers, judging whether the frame headers meet the requirements, storing the frame headers into a buffer array, and if not, setting the total count to be 1 to continue processing the subsequent data;
b: when the total count is the frame length, judging whether the frame end and the checksum meet the requirement, if so, calculating the force-sensitive adjusting coordinate (x, y) of the operating rod, and setting the total count to be 0, otherwise, continuously searching a second frame head from the first frame head position z1 to the position pointed by the total count in the buffer array: if the frame length is found, all data after the position z2 of the second frame header are shifted to the array header, and the frame length minus z2 is assigned to count; if not, the count is set to 1 (when the frame header has two bytes, the last data is assigned to the array head).
Step 33: judging whether the number of processed serial port data is smaller than the number of the serial port data received this time, if so, continuing the processing, and if not, exiting the loop;
finally, the force-sensitive adjustment coordinate semaphore is sent using the system function SemGive.
Wherein, in the implementation process of the step 4:
firstly, acquiring a force-sensitive adjusting coordinate semaphore;
then, judging whether a data pointer transmitted by the upper application is empty;
and finally, assigning the coordinate point to a data structure pointer transmitted by the application program.
Wherein the step4 comprises:
firstly, acquiring a force-sensitive adjusting coordinate semaphore by using a system function semTake; then, judging whether a data pointer transmitted by the upper application is null, and if the data pointer is null, returning to 0; and if not, assigning the coordinate point to a data structure pointer transmitted by the upper-layer application program and returning to 1.
The method is used for solving the problem of operating rod serial port driving under a vxworks platform.
Example 1
The embodiment provides a method for designing a joystick serial port drive based on semaphore events in a vxworks system, which comprises the following steps:
(1) reading the configuration information of the serial port of the operating lever, and acquiring the serial number of the equipment in the serial port resource of the system and the baud rate of the serial port;
(2) initializing a serial port equipment use environment, acquiring a serial port operation handle, configuring serial port resources and creating a serial port receiving task;
(3) analyzing serial port data to obtain force-sensitive adjustment coordinates sent by a control lever, carrying out legal verification on data sent by a serial port, and sliding windows on illegal data so as to reduce the packet loss rate;
(4) and setting a screen coordinate reporting event according to the semaphore, and providing the screen coordinate reporting event for an upper application to acquire control rod coordinate point information.
Wherein, the (1), (2) and (3) realize the coordinate information analysis process sent by the joystick device.
And (4) acquiring the semaphore sent in the analysis process in a blocking form, and setting a reporting event for an upper layer application to acquire coordinate information.
Example 2
As shown in fig. 1, in order to solve the problem of serial port driving of a joystick in a vworks system, the embodiment provides an implementation method based on a windows virtual mouse. The contents of this embodiment are further described below.
1. Reading the configuration information of the serial port of the operating lever;
a file object pointer is first created and the file contents are read starting from the first character of the configuration file. And then, acquiring the port number and the baud rate information corresponding to the keyword according to the character string defined by the comparison macro.
2. Initializing serial device usage environment
Step 1: acquiring a serial port device descriptor;
step 2: opening the serial equipment represented by the descriptor by using a vxworks system function open and storing an operation handle pointed by the serial;
step 3: configuring the baud rate and the check attribute of the serial device by using an ioctl function;
step 4: creating a serial port receiving task;
step 5: and the receiving task circularly uses the ioctl function to judge whether new data are received by the serial port. When the receiving length is larger than zero, reading serial port data by using a read function;
3. analyzing serial port data to obtain force-sensitive adjusting coordinates sent by control lever
Firstly, serial port data acquired by a serial port receiving task is created.
Then, the message is subjected to validity check to obtain a correct force-sensitive coordinate value of the control lever, and the method specifically comprises the following steps:
step 1: storing all serial port data received this time to a temporary array Temp;
step 2: sequentially processing each data in the temporary array Temp, and counting the total number count of legal data:
a: when the total count is the number of the frame headers, judging whether the frame headers meet the requirements, storing the frame headers into a buffer array, and if not, setting the total count to be 1 to continue processing the subsequent data;
b: when the total count is the frame length, judging whether the frame end and the checksum meet the requirement, if so, calculating the force-sensitive adjusting coordinate (x, y) of the operating rod, and setting the total count to be 0, otherwise, continuously searching a second frame head from the first frame head position z1 to the position pointed by the total count in the buffer array: if the frame length is found, all data after the position z2 of the second frame header are shifted to the array header, and the frame length minus z2 is assigned to count; if not, the count is set to 1 (when the frame header has two bytes, the last data is assigned to the array head).
Step 3: judging whether the number of processed serial port data is smaller than the number of the serial port data received this time, if so, continuing the processing, and if not, exiting the loop;
finally, the coordinate semaphore is sent using the system function SemGive.
4. Setting screen coordinate reporting event according to semaphore
Firstly, a system function semTake is used for obtaining coordinate semaphore; then, judging whether a data pointer transmitted by the upper application is null, and if the data pointer is null, returning to 0; and if not, assigning the coordinate point to a data structure pointer transmitted by the upper-layer application program and returning to 1.
By utilizing the technical scheme and adopting the operation steps, the invention can realize the operation of the joystick serial port drive under the vxwork system, and the method is verified by an algorithm and is tested by an experiment. The result shows that the scheme can shorten the response time of the joystick to the event and provide a screen coordinate point data interface for the upper application level.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for designing a joystick serial port drive based on semaphore events in a vxworks system is characterized by comprising the following steps:
step 1: reading the configuration information of the serial port of the operating lever;
step 2: initializing a serial port equipment use environment;
and step 3: analyzing serial port data to obtain force-sensitive adjusting coordinates sent by the operating lever;
and 4, step 4: setting a screen coordinate reporting event according to the semaphore;
through the steps, the serial port driving function of the joystick under the vxwork system can be realized.
2. The method for designing a joystick serial port drive based on semaphore events in a vxworks system according to claim 1, wherein the step1 is as follows: and reading information about the serial port number and the baud rate of the joystick in the root directory of the vxworks system.
3. The method for designing a joystick serial port drive based on semaphore event according to claim 1, wherein in step1, a file object pointer is created first, and file contents are read from the first character of a configuration file; and then, acquiring the port number and the baud rate information corresponding to the keyword according to the character string defined by the comparison macro.
4. The method for designing a joystick serial port drive based on semaphore events in a vxworks system according to claim 1, wherein in the implementation process of the step 2:
firstly, in equipment connected with a vxworks system, a serial port equipment descriptor communicated with a control rod is appointed;
secondly, opening serial port equipment communicated with the operating rod through a vxworks system function;
then, configuring baud rate and check bit parameters of the serial port;
and finally, establishing a serial port receiving task and receiving the serial port data of the operating rod.
5. The method for designing a joystick serial port drive based on semaphore events under a vxworks system as claimed in claim 1, wherein said step2 comprises:
step 21: acquiring a serial port device descriptor;
step 22: opening the serial equipment represented by the serial equipment descriptor by using a vxworks system function open, and storing an operation handle pointed by the serial;
step 23: configuring the baud rate and the check attribute of the serial device by using an ioctl function;
step 24: creating a serial port receiving task;
step 25: the serial port receiving task circularly uses the ioctl function to judge whether new data are received by the serial port or not; and when the receiving length is larger than zero, reading the serial port data by using a read function.
6. The method for designing a joystick serial port drive based on semaphore events in a vxworks system according to claim 1, wherein in the implementation process of the step 3:
firstly, receiving a task through a serial port, and acquiring the content of a mobile event data message sent by a control rod device;
then, carrying out validity verification on the mobile event data message, and carrying out sliding window processing on an illegal message to reduce the packet loss rate of serial port data; if the message is legal, acquiring force-sensitive adjusting coordinates (x, y) of the operating lever relative to the central point in the data content;
finally, a force sensitive adjustment coordinate semaphore is sent.
7. The method for designing a joystick serial port drive based on semaphore events under a vxworks system as claimed in claim 1, wherein said step3 comprises:
firstly, a serial port receiving task is created to obtain the mobile event data message content of the serial port.
Then, the mobile event data message is subjected to legality check to obtain the correct force-sensitive adjustment coordinate of the operating lever, and the specific steps are as follows:
step 31: storing all serial port data received this time to a temporary array Temp;
step 32: sequentially processing each data in the temporary array Temp, and counting the total number count of legal data:
a: when the total count is the number of the frame headers, judging whether the frame headers meet the requirements, storing the frame headers into a buffer array, and if not, setting the total count to be 1 to continue processing the subsequent data;
b: when the total count is the frame length, judging whether the frame end and the checksum meet the requirement, if so, calculating the force-sensitive adjusting coordinate (x, y) of the operating rod, and setting the total count to be 0, otherwise, continuously searching a second frame head from the first frame head position z1 to the position pointed by the total count in the buffer array: if the frame length is found, all data after the position z2 of the second frame header are shifted to the array header, and the frame length minus z2 is assigned to count; if not found, setting the count to 1;
step 33: judging whether the number of processed serial port data is smaller than the number of the serial port data received this time, if so, continuing the processing, and if not, exiting the loop;
finally, the force-sensitive adjustment coordinate semaphore is sent using the system function SemGive.
8. The method for designing a joystick serial port drive based on semaphore events in a vxworks system according to claim 1, wherein in the implementation process of the step 4:
firstly, acquiring a force-sensitive adjusting coordinate semaphore;
then, judging whether a data pointer transmitted by the upper application is empty;
and finally, assigning the coordinate point to a data structure pointer transmitted by the application program.
9. The method for designing a joystick serial port drive based on semaphore events under a vxworks system as claimed in claim 1, wherein said step4 comprises:
firstly, acquiring a force-sensitive adjusting coordinate semaphore by using a system function semTake; then, judging whether a data pointer transmitted by the upper application is null, and if the data pointer is null, returning to 0; and if not, assigning the coordinate point to a data structure pointer transmitted by the upper-layer application program and returning to 1.
10. The method for designing joystick serial driver under a vxworks system based on semaphore event according to claim 1, wherein the method is used for solving the problem of joystick serial driver under vxworks platform.
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