CN111581006B - Panel framework system facing display control system controller - Google Patents

Panel framework system facing display control system controller Download PDF

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Publication number
CN111581006B
CN111581006B CN202010386318.3A CN202010386318A CN111581006B CN 111581006 B CN111581006 B CN 111581006B CN 202010386318 A CN202010386318 A CN 202010386318A CN 111581006 B CN111581006 B CN 111581006B
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module
hardware
layer
panel
management module
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CN111581006A (en
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刘蕾
张耿
王为翔
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China Aeronautical Radio Electronics Research Institute
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China Aeronautical Radio Electronics Research Institute
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0751—Error or fault detection not based on redundancy
    • G06F11/0754—Error or fault detection not based on redundancy by exceeding limits
    • G06F11/0757—Error or fault detection not based on redundancy by exceeding limits by exceeding a time limit, i.e. time-out, e.g. watchdogs
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM]
    • G05B19/41845—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS], computer integrated manufacturing [CIM] characterised by system universality, reconfigurability, modularity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
    • G06F11/0793—Remedial or corrective actions
    • 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
    • G06F9/448—Execution paradigms, e.g. implementations of programming paradigms
    • G06F9/4488—Object-oriented
    • G06F9/449—Object-oriented method invocation or resolution
    • 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
    • G06F9/46—Multiprogramming arrangements
    • G06F9/48—Program initiating; Program switching, e.g. by interrupt
    • G06F9/4806—Task transfer initiation or dispatching
    • G06F9/4812—Task transfer initiation or dispatching by interrupt, e.g. masked
    • G06F9/4825—Interrupt from clock, e.g. time of day
    • 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
    • G06F9/46—Multiprogramming arrangements
    • G06F9/54—Interprogram communication
    • G06F9/545—Interprogram communication where tasks reside in different layers, e.g. user- and kernel-space
    • 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
    • G06F9/46—Multiprogramming arrangements
    • G06F9/54—Interprogram communication
    • G06F9/546—Message passing systems or structures, e.g. queues
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

The invention belongs to the field of avionics, and relates to a panel framework system facing a display control system controller. Top down includes: the main control layer, the module management layer and the bottom hardware driving layer; the module management layer divides the system into software function modules according to hardware functions and interfaces, decomposes, simplifies and refines the attribute of each module to obtain common characteristics, encapsulates the common characteristics into a structural body and abstracts the common characteristics into objects; the abstract object of each module component has a hardware interface driving function consistent with the object; the main control layer is responsible for scheduling the whole software control logic, and records the state of each module by utilizing the global variable of the independent module, wherein each module is provided with an interface management function consistent with the module; the bottom hardware driving layer is responsible for realizing hardware interface programming aiming at specific hardware, the interface characteristics of the hardware are hidden in the bottom hardware driving layer, and the module management layer only needs to call standardized hardware interface functions to obtain the state of the hardware.

Description

Panel framework system facing display control system controller
Technical Field
The invention belongs to the field of avionics, and relates to a panel framework system facing a display control system controller.
Background
The main function of the display control system controller is to collect the information of control command or operation state sent by pilot through keys, knobs, switches and track balls, and send the information to the display control processor of the onboard comprehensive display system through a multi-channel data transmission bus; meanwhile, the display control system controller receives commands and data sent by the display control processor through a transmission bus, displays corresponding parameters on a dot matrix LED display window, and provides a man-machine interface of the display control system of the aircraft cabin for a driver.
The hardware design of the cabin display control system controller usually adopts a modularized design thought to divide the controller hardware into three modules: a power module; the panel combination unit comprises a key unit and a light guide plate; a main processing module;
the power supply module converts +28VDC from the outside into +5VDC and provides the +5VDC to the display control system controller as the working voltage; the panel combination unit is responsible for collecting panel information and transmitting the panel information to the main processing module; the main processing module is responsible for framing the information generated by the panel combination unit and transmitting the information to a display control processor of the airborne integrated display system; meanwhile, the command and the data sent by the display control processor are received and displayed on the LED display screen.
According to the hardware function requirement of the panel combination unit, the hardware platform of the main processing module needs to provide hardware resources: calculating performance; storing performance; an input/output interface; a communication interface; interrupt the system, etc.
The main processing module often adopts a design combination of an embedded microcontroller and a protocol chip or a design combination of a system-on-chip SoC device and a protocol IP to provide the above functional requirements. Common devices are: ATmega128L, ATmega 256L, NIOS embedded processor, xinlinx Artix7, etc. Because the hardware design of the main processing module of the display control system controller selects a plurality of types of embedded processors, the software excessively considers the realizability of the software functions in the early design stage, and the software functions are excessively coupled, so that the problems of difficult software utilization, insufficient portability, lack of expansibility and the like of the main processing module of the display control system controller are caused.
Disclosure of Invention
The invention aims to: the panel framework system for the display control system controller is provided, and portability, expandability and generalization of the display control system controller are improved.
The technical scheme is as follows:
the invention provides a panel frame facing a display control system controller, which vertically performs layered design from top to bottom on functions and comprises the following components: the main control layer, the module management layer and the bottom hardware driving layer; transversely simulate the design to the hardware interface, include: the system comprises a panel management module, a transmission data bus management module, a message management module, a timer management module and an LRU management module;
the main control layer is responsible for the control logic of the whole software and transmits the data stream to each module according to the system function; the module management layer divides the hardware into modules according to the hardware interfaces and the software functions, analyzes, simplifies and refines the interface attribute of each hardware to obtain common characteristics, encapsulates the common characteristics into a structural body and abstracts the common characteristics into objects; the bottom hardware driving layer is responsible for realizing hardware interface programming aiming at specific hardware, the interface characteristics of the hardware are hidden in the bottom hardware driving layer, and the module management layer only needs to call standardized hardware interface functions to obtain the state of the hardware.
No data is transferred between the module management layers.
The panel management module takes the keys, the electrodeless knob switch and the multi-gear switch as three independent objects to carry out attribute encapsulation.
The main control layer instantiates global objects corresponding to keys, knobs and switches in a main file, and instantiates the global objects by accessing a static two-dimensional array configuration table in a config.h configuration file; the static two-dimensional array configuration table comprises general attributes of each key, knob and switch; the hardware driving layer provides interface states of keys, knobs and switches for the panel management module; the panel module management is responsible for taking different behavior patterns according to different objects and delivering the identified information to the upper layers.
The transmission data bus management module takes a display control system controller as a bus terminal node, responds to a command from a bus and sends terminal node data to other nodes through the bus;
for the protocol chip and the protocol IP, the bottom hardware driving layer is responsible for providing a hardware driving interface for the module management layer, and the module management layer uses a state machine mechanism to manage the module.
The message package of the message management module comprises: handshake messages, configuration messages, self-test messages, panel messages; the message management module packages and stores each message in a structure form, the byte length is at least composed of one byte, and the content comprises a message identifier and a message content;
the main control layer transmits the latest panel information obtained from the panel management module to the information management module, the information management module firstly obtains the currently defined panel number from the config.h configuration file, and then calls a corresponding information packing function according to the panel number to pack the panel information;
each numbered controller defines an independent protocol file containing a corresponding message packet, and different controllers only need to change BOARD_TYPE macro definition in the config.h configuration file.
The timer management module manages a timer, the timer generates clock interrupt to the CPU by millisecond overflow interrupt, the main control layer is used for responding to the interrupt response to the CPU through the interrupt service program, if the executed instructions in the interrupt service program are too many, the CPU is caused to delay responding to the timer interrupt, and the system generates interrupt time error;
the master control layer defines timer objects in the master file according to different timer periods, and each timer comprises two attributes of a counting variable and a flag bit variable; the interrupt service routine is responsible for counting the counting variable, setting the flag bit variable after the counting variable reaches the overflow value, completing the timer function and generating a timer reference.
The management module is used for: recording LRU personalized information; switching the LRU software state; monitoring the state of a component, immediately taking emergency measures and reporting once a failure event occurs to a certain component or multiple components; and monitoring the running state of the main control software, and resetting the software by using a watchdog once the running of the application software occurs.
The invention has the advantages that:
the panel framework combines the top-to-bottom and bottom-to-top software design thought, the software function framework adopts a top-to-bottom and thick-to-thin method to layer the software system framework, the control logic of the top control logic and the control logic of the module management layer are completely isolated, the module-level data flow is only transmitted longitudinally, and the low coupling of the data flow and the logic function is ensured; the software functional module adopts a method of programming from bottom to top and facing the interface to divide the functions of the module, the functions of the module are single, the attributes of the modules are packaged into a structure, the association between the software modules is reduced, the system stability is improved, and the low coupling between the functional modules is ensured.
Drawings
FIG. 1 is a schematic diagram of a module management state machine according to the present invention.
FIG. 2 is a block diagram of a software design overall architecture system of the present invention.
Detailed Description
The invention provides a panel framework system facing a display control system controller, as shown in fig. 2, comprising:
the software framework system is divided into a main control layer, a module management layer and a bottom hardware driving layer from top to bottom. The master control layer is responsible for scheduling the whole software control logic, and records the state of each module by utilizing the global variable of the independent module, wherein each module is provided with an interface management function consistent with the module. The module management layer divides the module components according to hardware functions and interfaces, decomposes, simplifies and refines the attribute of each module component to obtain common characteristics, encapsulates the common characteristics into a structural body and abstracts the common characteristics into objects; the abstract object of each module component has a hardware interface driving function consistent with the object; and no data is transmitted between the module management layers, so that the mutual influence between the modules is further reduced. The bottom hardware driving layer is responsible for realizing hardware interface programming aiming at specific hardware, the interface characteristics of the hardware are hidden in the bottom hardware driving layer, and the module management layer only needs to call standardized hardware interface functions to obtain the state of the hardware, so that the characteristics of the hardware do not need to be identified.
The software functional modules are mainly divided into: the system comprises a panel management module, a transmission data bus management module, a message management module, a timer management module and an LRU management module.
1. Panel management module
The display control system controller panel combination unit is often provided with an I/O independent key, a matrix keyboard type key, an LED display screen, an electrodeless knob switch, a multi-gear switch, an ADC sampling knob, a track ball and the like. The functional requirements of the key are mainly divided into a function of keeping linkage of the relay, a function of indicating the up and down states of the subsystem by an indicator lamp, a hardware self-locking function and the like.
The panel management module takes the keys, the electrodeless knob switch and the multi-gear switch as three independent objects to carry out attribute encapsulation. The key structure body comprises key general attributes (number, type, chip selection address, bit corresponding to the chip selection address, level read-in address bit and key code value) and special attributes (state, starting time, overflow time and reserved attributes). The knob structure body comprises general attributes (number, type, chip selection address, bit corresponding to the chip selection address, level read-in address bit and key code value) and special attributes (state, change step and send flag bit update state) of the knob. The multi-gear switch includes general attributes (number, level read address bit, key value) and special attributes (status, send flag update status).
The main control layer instantiates keys, knobs and switches corresponding to global objects in the main file, and instantiates the global objects by accessing a static two-dimensional array configuration table in the config.h configuration file. The static two-dimensional array configuration table contains the general attributes of each key, knob and switch. The hardware driver layer provides interface states of keys, knobs and switches to the panel management module. The panel module management is responsible for taking different behavior patterns according to different objects and delivering the identified information to the upper layers.
The panel management function module is characterized in that: the number of keys, knobs and switches is increased only by modifying the configuration table in the configuration file config.h, and a module management layer is not required to be modified; the hardware change only needs to change the bottom hardware driving function.
2. Transmission data bus management module
Different on-board display control systems may adopt different communication protocols to realize data transmission between the display control system controller and the display control processor, such as standard data buses: RS-422, ARINC429 bus, RS-485, MIL-STD-1553, CAN, etc. The display control system controller is used as a bus terminal node, and is required to respond to commands from a bus and send terminal node data to other nodes through the bus, so that the real-time performance of data transmission is required to be ensured, and the fault tolerance and reliability of the system are also required to be ensured.
For the protocol chip and the protocol IP, the bottom hardware driving layer is responsible for providing a hardware driving interface for the module management layer, and the module management layer uses a state machine mechanism to manage the module.
The state machine implementation diagram is shown in fig. 1:
3. message management module
The message packet is mainly divided into: handshake messages, configuration messages, self-test messages, panel messages, etc. Each message is stored in a structured form in a package, the byte length is composed of at least one byte, and the content includes a message identifier and a message content.
The main control layer transmits the latest panel information obtained from the panel management module to the information management module, the information management module firstly obtains the currently defined panel number from the config.h configuration file, and then calls a corresponding information packing function according to the panel number to pack the panel information.
Each numbered controller defines an independent protocol file containing a corresponding message packet, and different controllers only need to change BOARD_TYPE macro definition in the config.h configuration file.
4. Timer management module
The timer overflows to interrupt to generate clock interrupt to CPU, the main control layer responds to the interrupt response to CPU through interrupt service program, if the instructions executed in the interrupt service program are too many, the CPU will delay to respond to the timer interrupt, resulting in interrupt time error of system.
The master control layer defines timer objects in the master file according to different timer periods, and each timer comprises two attributes of a counting variable and a flag bit variable. The interrupt service routine is responsible for counting the counting variable, and setting the flag bit variable after the counting variable reaches the overflow value to complete the timer function. A timer reference is generated.
5. LRU management module
The LRU (Line Replace Unit, line replaceable unit) management module has the main functions of: recording LRU personalized information; switching the LRU software state; monitoring the state of a component, immediately taking emergency measures and reporting once a failure event occurs to a certain component or multiple components; and monitoring the running state of the main control software, and resetting the software by using a watchdog once the running of the application software occurs. The display control system controller needs to report the LRU state and the self-checking information of each component to the display control system, and the method comprises the following steps: LRU current state, CPU self-checking information, RAM self-checking information, ROM self-checking information, panel module self-checking information, transmission data bus self-checking information, etc. The failure of each functional component can cause certain safety hazard to an aircraft system, the LRU management module divides all the functional component self-checking information into structural bodies, the structural bodies are recorded in the LRU management module, and the LRU management module defines the general attribute (working state, functional component self-checking state) and special attribute (position information and the like) of the LRU. The master layer manages LRUs using a state machine mechanism.
The panel frame facing the display control system controller can be transplanted among various hardware platforms, reduces repeated design work of software caused by platform replacement or external interface device replacement, and improves the software multiplexing rate.
Examples
An embodiment of the present invention is shown in fig. 2 below:
the hardware resources of the main processing module are as follows:
ATmega128L, dominant frequency 7.3728MHz;
on-chip programmable FLASH:128K;
on-chip EEPROM:4K;
on-chip SRAM:4K;
ARINC429 bus network, use agreement chip HI-3210 to realize the multi-channel bus communication;
an external hardware watchdog;
the master layer is made up of main.c source files defining LRU, HI3210, display_info, key_info, knob_info components. The module management layer is mainly divided into a panel management module, an HI3210 management module, an LRU management module, a timer management module and a message management module. The hardware driver layer provides hardware interface drivers for each module respectively.

Claims (6)

1. A display control system controller-oriented panel framework system, characterized by a top-down layered design of longitudinal functional pairs, comprising: the main control layer, the module management layer and the bottom hardware driving layer; transversely simulate the design to the hardware interface, include: the system comprises a panel management module, a transmission data bus management module, a message management module, a timer management module and a line replaceable unit LRU management module;
the main control layer is responsible for the control logic of the whole software and transmits the data stream to each module according to the system function; the module management layer divides the hardware into modules according to the hardware interfaces and the software functions, analyzes, simplifies and refines the interface attribute of each hardware to obtain common characteristics, encapsulates the common characteristics into a structural body and abstracts the common characteristics into objects; the bottom hardware driving layer is responsible for realizing hardware interface programming aiming at specific hardware, the interface characteristics of the hardware are hidden in the bottom hardware driving layer, and the module management layer only needs to call standardized hardware interface functions to obtain the state of the hardware;
no data is transferred between the module management layers;
the panel management module takes the keys, the electrodeless knob switch and the multi-gear switch as three independent objects to carry out attribute encapsulation.
2. The panel framework system of claim 1, wherein the master layer instantiates keys, knobs and switches in the master file corresponding to global objects by accessing a static two-dimensional array configuration table in a config.h configuration file; the static two-dimensional array configuration table comprises general attributes of each key, knob and switch; the hardware driving layer provides interface states of keys, knobs and switches for the panel management module; the panel module management is responsible for taking different behavior patterns according to different objects and delivering the identified information to the upper layers.
3. The panel framework system of claim 2 wherein the transmission data bus management module uses the display control system controller as a bus termination node, responds to commands from the bus and sends termination node data to other nodes over the bus;
for the protocol chip and the protocol IP, the bottom hardware driving layer is responsible for providing a hardware driving interface for the module management layer, and the module management layer uses a state machine mechanism to manage the module.
4. The panel framework system of claim 3 wherein the message package of the message management module comprises: handshake messages, configuration messages, self-test messages, panel messages; the message management module packages and stores each message in a structure form, the byte length is at least composed of one byte, and the content comprises a message identifier and a message content;
the main control layer transmits the latest panel information obtained from the panel management module to the information management module, the information management module firstly obtains the currently defined panel number from the config.h configuration file, and then calls a corresponding information packing function according to the panel number to pack the panel information;
each numbered controller defines an independent protocol file containing a corresponding message packet, and different controllers only need to change BOARD_TYPE macro definition in the config.h configuration file.
5. The panel framework system according to claim 4, wherein the timer management module manages a timer that generates a clock interrupt to the CPU in millisecond overflow interrupt, the master control layer suspends the interrupt response to the CPU through the interrupt service routine response, and if the instructions executed in the interrupt service routine are excessive, the CPU delays responding to the timer interrupt, resulting in an interrupt time error of the system;
the master control layer defines timer objects in the master file according to different timer periods, and each timer comprises two attributes of a counting variable and a flag bit variable; the interrupt service routine is responsible for counting the counting variable, setting the flag bit variable after the counting variable reaches the overflow value, completing the timer function and generating a timer reference.
6. The panel framing system of claim 5, wherein the management module is to: recording LRU personalized information; switching the LRU software state; monitoring the state of a component, immediately taking emergency measures and reporting once a failure event occurs to a certain component or multiple components; and monitoring the running state of the main control software, and resetting the software by using a watchdog once the running of the application software occurs.
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