CN102215230B - Bus protocol-independent communication method for scalable processor architecture version 8 (SPARC V8) monitoring software - Google Patents
Bus protocol-independent communication method for scalable processor architecture version 8 (SPARC V8) monitoring software Download PDFInfo
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Abstract
The invention discloses a bus protocol-independent communication method, which is used for establishing a command-driven communication protocol independent of a specific communication port between a host and a target machine. The host comprises a file management and data transmission module, a protocol command processing module and various bus communication processing modules. The target machine comprises a command execution and data transmission module, a command resolution module and the various bus communication processing modules. The method is characterized in that: the host further comprises a communication management module arranged between the protocol command processing module and the various bus communication processing modules; the target machine further comprises the communication management module arranged between the command resolution module and the various bus communication processing modules; and the communication management module is provided with four buffer zones which are a command execution buffer zone, a command receiving buffer zone, a data execution buffer zone and a data receiving buffer zone, and manages the specific communication port.
Description
Technical field
The present invention relates to the irrelevant communication means of a kind of bus protocol, relate in particular to and realize the irrelevant communication means of bus protocol adopting the target machine of SPARC V8 processor and adopt between the host of PC.
Background technology
For embedded system development, monitoring software has important effect in the debugging of embedded system and application process.The operational mode of general monitoring software is on host, to move a control desk, moves an agent software on target machine, by command analysis module, information or data is sent to target.Information exchange between agency and control desk need to be used communication bus, according to bus kind difference, communication protocol is also different, therefore the exchanges data completing in information exchanging process and order exchange need to be formulated different Information Exchange Agreements according to the difference of communication protocol, could go to control by host computer like this operation of slave computer.The current practice is that command interaction process and bus protocol are closely related based on the specific bus of one, and this man-to-man communication mode is not supported multiple communication bus, need to formulate different communication protocol and data transmission format according to the difference of bus type.Current communication structure as shown in Figure 1.
SPARC V8 (Scalable Processor Architecture V8) is that SUN Microsystems is in 32 risc processor architectures of a kind of opening of the proposition eighties in last century.SPARC V8, as a kind of general processor, is applied to multiple different environment.Communication bus between target machine and host take SPARC V8 as processor has multiple, therefore, communication protocol between target machine and host that monitoring software is related must adapt to the communicating requirement of multiple bus, and current man-to-man bus communication mode has limited the extensive adaptability of embedded system development.
Summary of the invention
In order to adapt to various types of communication bus requirements, improve system development efficiency, need the irrelevant communication protocol of a kind of general and concrete communication port, thereby be issued to the object that adapts to different communication protocol need not change data structure situation.
The invention provides the irrelevant communication means of a kind of bus protocol, for set up the command driven formula communication protocol irrelevant with concrete communication port between host and target machine; Described host comprises file management and data transmitting module, protocol command processing module and bus communication processing module, wherein file management and data transmitting module mainly complete the bookkeeping to file and the identification to interface alternation function and management, and protocol command processing module is for the send and receive of communications command and data; Described target machine comprises command execution and data transmitting module, command analysis module and bus communication processing module, wherein command execution and data transmitting module are under the control of host, data are sent to the appointed area of target machine, or the data of target machine appointed area are passed to host, command analysis module has been used for parsing, the execution of communication protocol order; It is characterized in that:
Described host also comprises the communication management module being arranged between protocol command processing module and bus communication processing module, described target machine also comprises the communication management module being arranged between command analysis module and bus communication processing module, described communication management module is provided with four buffering areas, be respectively command execution buffering area, order reception buffer zone, data executive buffer, data receiver buffering area, and concrete communication port is managed;
Wherein, the process of the communication management module of described target machine parsing communications command is as follows:
(1) first target machine is done to initialization, and all communication port of initialization and buffering area, go to step (2), enter communication port selection course;
(2) resolving before communications command, first communication port is identified, during communication, adopted automatic identifying method to select communication port, after system reset, suppose that all communication ports all may serve as communication port; If need to receive serial data,, according to the each port of predefined passage sequential query, the port of first finding data will be selected as transient port; If receive a correct order from transient port, think and receive that the communication port of this order is exactly the communication port of current selection, and give communication port selection marker by current channel selecting sign, complete the selection of communication port;
(3) recognize after available communication port fill order resolving; According to agreement agreement, the packets of information that host is sent here is divided into buffers command bag, three kinds of immediate command bag and data command bags, and order bag type is determined by the first character of received information bag; If buffers command bag performs step (4), data command bag execution step (5), immediate command bag execution step (6), other go to step (7);
(4) receive after buffers command bag, first judge order length and verification and whether correct, if correct, the data that receive are kept in to order reception buffer zone, when host confirms that by check command target machine has correctly received after buffers command, switch to again command execution buffering area, and command execution buffer state is set is to go to step (7) after order ready state;
(5) receive after data command bag, the data that receive are kept in to data receiver buffering area, when host, confirm target machine by check command and correctly received after this data command bag, it is to go to step (7) after data ready that data receiver buffer state is set; By an order, switch to data executive buffer, while carrying out for buffers command;
(6) receive after immediate command bag, according to order bag type, carry out different command functions, give response packet of host loopback simultaneously, and go to step (7); If what receive is the order of ordering in executive buffer, the buffers command of storing in fill order buffering area, the function that buffers command realizes comprises wipes FLASH, upload program or data, download the data of target internal memory, or transfer to assigned address and remove executive program, after being finished, go to step (7);
(7) finish this communications command resolving, go to step (2).
Especially, described host adopts PC, and it is CPU that described target machine adopts SPARC V8 processor.
Adopt the irrelevant communication means of bus protocol of the present invention can select arbitrarily a kind of communication bus, between target machine and host, set up a kind of intermediate layer of stratification simultaneously, it is a kind of virtual communication agreement, this agreement is taked a kind of command response mode, command process and bus communication are isolated mutually, make the expansion of order convenient.For communication port, bidding protocol can be resolved which kind of port of use automatically to be communicated, can shield the otherness between different communication interface simultaneously, between host and target machine, set up the command driven formula communication protocol irrelevant with concrete communication port, support the expansion of communications command and serial communication interface simultaneously.
Accompanying drawing explanation
Fig. 1 is the communication structure figure between target machine and the host of prior art.
Fig. 2 is the brief block diagram of protocol transmission.
Fig. 3 is overall formation and the layering block diagram of monitoring software of the present invention.
Fig. 4 is buffer data flow path direction schematic diagram of the present invention.
Fig. 5 is the running figure that target machine of the present invention is resolved communications command.
Embodiment
It is CPU that the target machine of present embodiment adopts SPARC V8 processor, host adopts PC, by buses such as 1553B bus, serial communication bus (UART), CAN, SPI or SPACEWIRE, internal storage data to target machine or program are uploaded and are loaded and download passback, control the program execution flow of target machine.Order between host and target machine, data, state are replied and are all adopted protocol package form to transmit.Under normal circumstances, always by PC, first to target machine, send an order bag, target machine is correctly receiving orders after bag, according to agreement to the corresponding state response packet of PC loopback.Fig. 2 is the brief block diagram of protocol transmission.
Which kind of bus of choice for use is set up the communication between host and target machine, for target machine, is transparent, and this bus can change, as long as it is just passable to meet interface needs.Specific practice of the present invention is to select arbitrarily a kind of communication bus, between target machine and host, set up a kind of intermediate layer of stratification simultaneously, it is a kind of virtual communication agreement, this agreement is taked a kind of command response mode, command process and bus communication are isolated mutually, can make like this expansion of order convenient.For communication port, communication protocol can be resolved which kind of port of use automatically to be communicated, can shield the otherness between different communication interface simultaneously, between host and target machine, set up the command driven formula communication protocol irrelevant with concrete communication port, support the expansion of communications command and serial communication interface simultaneously.
When realizing, agreement mainly by three parts, formed: operate in agent software (V8_Agent) and communication interface standard (CP) three parts in control desk software (V8_Loader) on PC, target, moved and form, this three part forms the monitoring software of whole agreement.V8_Loader is to complete the functions such as communication interface selection, file management, data packing for the upper operation of host (PC), and communicates according to communication protocol and agent software, completes data to pass up and down; Agent software operates on the target machine take V8 processor as CPU, complete parsing, the execution of various communication protocol orders, under the control of control desk software, data are sent to the appointed area of target machine, or the data of target machine appointed area are passed to control desk software; Communication interface standard has stipulated communication format and command functions and the form between control desk software and agent software.
Monitoring software adopts layering implementation method and the modular design method of agreement constraint, and Fig. 3 has provided overall formation and the layering block diagram of monitoring software.
Host comprises file management and data transmitting module, protocol command processing module, communication management module and various bus communication processing module, mainly complete the functions such as communication interface selection, file management, data packing, and communicate according to communication protocol and target machine, complete data and pass up and down.Wherein file management and data transmitting module mainly complete bookkeeping to file (comprising the opening and shutoff operation etc. of original position boundary alignment, communication port of length setting, the file of file), with identification and the management to interface alternation function, protocol command processing module is for the send and receive of communications command and data.Bottom communication administration module manages concrete communication port, is the core component of whole agreement, and general telecommunication management is directly that the bus protocol of command analysis module and bottom directly communicates, without communication management module.The practice of the present invention is in command analysis module and directly between bus protocol, communication management module is set, communication management module is equivalent to the buffering area of a format conversion, when expanding different bus protocols, as long as defer to the data interaction standard of buffering area, data directly store buffering area into, thereby can meet different bus communication protocols, actual buffering area is transparent for the command analysis module on upper strata and the bus communication processing module of bottom.Described communication management module is provided with four buffering areas, is respectively command execution buffering area, order reception buffer zone, data executive buffer, data receiver buffering area, and concrete communication port is managed.
The various communication buss of bottom can send the data directly to communication management layer, and communication management layer is by forming new data format to data recombination, and the module that directly offers upper strata is used, and therefore communication management module plays the effect of forming a connecting link.
Target machine comprises command execution and data transmitting module, command analysis module, communication management module and various bus communication processing module.Command execution in target machine and the Main Function of data transmitting module are under the control of host, data are sent to the appointed area of target machine, or the data of target machine appointed area are passed to host; Command analysis module is obtained order from communication layers, has been mainly parsing, the execution of various communication protocol orders; The buffering area arranging in communication management module can be that actual physics exists, and can be also that virtual in logic, virtual buffering area uses more convenient, is convenient to management.Communication management module provides the data flow of protocol package to command analysis module according to byte order, command analysis module is regarded the communication management module of bottom as a virtual serial communication interface, and byte order is in accordance with regulations from wherein receiving and send protocol package.Fig. 4 is the data flow direction schematic diagram between the bus communication processing module of communication management module and bottom and the command analysis module on upper strata.As can be seen from the figure, this agreement has realized a kind of multi-level agreement and interface, the command process of basic communication protocol and top layer is kept apart, make monitoring software all be easy to expand from two aspects of function and the physical interface of communicating by letter, and be independent of each other.
For the ease of management, protocol command has been carried out to Classification Management, protocol command, be a point three types: immediate command, buffers command and data command.The object of doing be like this because monitoring software for different order reaction ageing be different.For immediate command, order is real-time, need to carry out at once, and amount of information is short; Buffers command, for to can time delay order carrying out time delay management, is mainly that packet is managed; Data command is mainly used in mass data to carry out data packing etc.
The up protocol package of PC provides the command function passing up and down, is divided into buffers command bag, immediate command bag and packet three classes:
(a) buffers command bag, mainly provides the command function passing up and down, pre-exists in the buffering area of target machine after uploading, and after PC sends fill order, just carries out; After target machine is complete, only execution result is stored in command buffer, not to any state information of PC loopback, only, when PC uses querying command, just the response packet using the state information in buffering area as querying command is given PC.
(b) immediate command bag, provides the function such as control, status poll of target machine, after uploading, can carry out immediately, target machine also can be after complete state response packet of loopback immediately.
(c) packet, is mainly for the data block to the order of target machine function of injecting, and after target machine receives, not loopback is any replys, and just data is placed in a buffering area, and the state of data buffer zone is set according to check results.
The descending protocol bag of target machine is divided into two kinds of state response packet and packets:
(a) state response packet is the response to the immediate command from PC.For immediate command, target machine can be carried out immediately this order after command checksum is correct, according to the corresponding state response packet of order request loopback.
(b) packet is the data block of command function.PC is responsible for the correctness of checking data bag, if when incorrect, can again obtain by the execution of restarting buffers command.
No matter up or descending, the form of all bags is all as follows:
Leading character, length, bag content, check byte
Wherein: leading character is an ascii character, take a byte; Length can be byte, also can be word, has represented the byte number of bag content; Bag content is order or data, variable-length; Check byte is that leading character, length, bag content are by the result of byte XOR.
In protocol package transport process, all the elements are all by byte transmission, and 16 words first transmit low byte, rear transmission high byte; 32 double words, the order transmission of pressing lowest byte, inferior low byte, inferior high byte, highest byte.
Introduce the command function of PC below.
Buffers command is actual command function.Target machine is not carried out after receiving immediately, but verification correct after, order is kept in to reception buffer zone, after PC sends buffering area switching command, reinstall executive buffer, wait PC to send just execution after fill order.Buffers command can comprise erase command, upload command, pass order, transfer command etc. down, can add as required different command functions.
Wherein erase command refers to and wipes appointed area in FLASH, maybe appointment ram region is filled out as full 0, because SPARCV8 processor can articulate dissimilar memory, comprises PROGRAM ROM (FLASH), SRAM, DRAM etc.The initial address of wiping must be at the boundary alignment of erasable of minimum; While realizing, if do not meet boundary alignment, can first unnecessary data be downloaded to PC by passing down order, after to be erased completing, then upload curing.
Upload command is that the data in current executing data buffering area are sent to appointed area, if the V8 processor using is 32, the destination address of uploading data must be in 32 bit boundary alignment so, the data length of uploading is necessary for 4 integral multiple, if can not meet the demands, can first unnecessary data be downloaded to PC by passing down order, splice and upload again with the data that will upload.
Download command be by the data down transmission of appointed area in target machine memory to PC, can specify the data length of download, initial address can be any position of target machine memory.
Transfer command can force target machine to transfer to assigned address executive program, and jump address must be 32 double words simultaneously.The form of command type is in Table 1.
Data command is used for injecting a data block to the reception data buffer of target machine.On target machine, should realize an executing data buffering area and a reception data buffer.Data when executing data buffering area is buffers command execution, and the data block of newly receiving is always put into current reception data buffer, PC can be realized by switching command the switching of reception data buffer and executing data buffering area.Each data buffer zone should comprise a positioning indicator, and whether expression data are applied, whether data receiver is correct.
Immediate command is that PC is realized the direct command of controlling with status poll to target machine.Target machine is received this type of order, as long as verification is correct, just carries out immediately, and as requested to the respond packet of PC loopback regulation.If verification is incorrect, target machine will be abandoned packets of information, not do any response.If target machine goes out the phenomenon of active character receiving in order, PC can force the target machine accepting state that exits command by sending slack byte, can certainly utilize timeout treatment.
The type of immediate command comprises a variety of, in concrete use, can add as required and expand, and the detailed description of immediate command is in Table 2.
The agreement of introducing target machine below realizes.
V8_Agent mainly completes parsing, the execution of various communication protocol orders, under the control of V8_Loader, data is sent to the appointed area of target machine, or the data of target machine appointed area are passed to V8_Loader.Fig. 5 has provided the running of target machine resolve command, for target machine, it ceaselessly receives in circular wait the order that host sends over, carry out afterwards the process of order reception and analysis program, this program is only processed an order (or an idle character) at every turn and is exited afterwards.Mainly being divided into following step carries out:
(1) first target machine is done to initialization, and all communication port of initialization and buffering area, go to step (2), enter communication port selection course;
(2) resolving before communications command, first communication port is identified, during communication, adopted automatic identifying method to select communication port, after system reset, suppose that all communication ports all may serve as communication port; If need to receive serial data,, according to the each port of predefined passage sequential query, the port of first finding data will be selected as transient port; If receive a correct order from transient port, think and receive that the communication port of this order is exactly the communication port of current selection, and give communication port selection marker by current channel selecting sign, complete the selection of communication port;
(3) recognize after available communication port fill order resolving; According to agreement agreement, the packets of information that host is sent here is divided into buffers command bag, three kinds of immediate command bag and data command bags, and order bag type is determined by the first character of received information bag; If buffers command bag performs step (4), data command bag execution step (5), immediate command bag execution step (6), other go to step (7);
(4) receive after buffers command bag, first judge order length and verification and whether correct, if correct, the data that receive are kept in to order reception buffer zone, when host confirms that by check command target machine has correctly received after buffers command, switch to again command execution buffering area, and command execution buffer state is set is to go to step (7) after order ready state;
(5) receive after data command bag, the data that receive are kept in to data receiver buffering area, when host, confirm target machine by check command and correctly received after this data command bag, it is to go to step (7) after data ready that data receiver buffer state is set; By an order, switch to data executive buffer, while carrying out for buffers command;
(6) receive after immediate command bag, according to order bag type, carry out different command functions, give response packet of host loopback simultaneously, and go to step (7); If what receive is the order of ordering in executive buffer, the buffers command of storing in fill order buffering area, the function that buffers command realizes comprises wipes FLASH, upload program or data, download the data of target internal memory, or transfer to assigned address and remove executive program, after being finished, go to step (7);
(7) finish this communications command resolving, go to step (2).
The agreement of introducing host below realizes.
V8_Loader software, in the upper operation of host (PC), completes the functions such as communication interface selection, file management, data packing, and communicates according to communication protocol and V8_Agent, completes data and passes up and down.Under the control of V8_Loader, data are sent to the appointed area of target machine, or the data of target machine appointed area are passed to V8_Loader.
According to the hierarchical model of the monitoring software shown in Fig. 3, V8_Loader is comprised of the functional module of file management and data transmission, protocol command processing, telecommunication management and four levels of communication drivers.
Wherein communication management layer provides the mapping of various communication functions to different bus interface.On the basis of Communication driver, complete the simple conversion work of communication character to protocol package.Communication drivers layer can add corresponding driver according to actual communication port, can expand very easily other communication buss, thereby completes the bottom management to communication port.
The present invention propose with the irrelevant communication means of bus protocol, for a kind of general communication interface is provided between the embedded system take SPARC V8 as processor and host.Utilize the control desk software of PC and the monitoring program of target machine to complete communication each other by the communications protocol in intermediate layer, can shield preferably the otherness between different communication interface.Simultaneously, because this communication modes is based on hardware itself, so communication is that developer can more conveniently upload or download the internal storage data of target machine reliably, improve greatly development efficiency, can generally meet the requirement of biography up and down to target machine internal storage data.
For those skilled in the art be, without departing from the spirit and scope of the present invention, the present invention has many distortion, for example described embedded system can be based on other known types processor, described host can not be also PC, etc. these be included in the scope described in following claim.
Claims (2)
1. the irrelevant communication means of bus protocol, for setting up the command driven formula communication protocol irrelevant with concrete communication port between host and target machine; Described host comprises file management and data transmitting module, protocol command processing module and bus communication processing module, wherein file management and data transmitting module mainly complete the bookkeeping to file and the identification to interface alternation function and management, and protocol command processing module is for the send and receive of communications command and data; Described target machine comprises command execution and data transmitting module, command analysis module and bus communication processing module, wherein command execution and data transmitting module are under the control of host, data are sent to the appointed area of target machine, or the data of target machine appointed area are passed to host, command analysis module has been used for parsing, the execution of communication protocol order; It is characterized in that:
Described host also comprises the communication management module being arranged between protocol command processing module and bus communication processing module, described target machine also comprises the communication management module being arranged between command analysis module and bus communication processing module, described communication management module is provided with four buffering areas, be respectively command execution buffering area, order reception buffer zone, data executive buffer, data receiver buffering area, and concrete communication port is managed;
Wherein, the process of the communication management module of described target machine parsing communications command is as follows:
(1) first target machine is done to initialization, and all communication port of initialization and buffering area, go to step (2), enter communication port selection course;
(2) resolving before communications command, first communication port is identified, during communication, adopted automatic identifying method to select communication port, after system reset, suppose that all communication ports all may serve as communication port; If need to receive serial data,, according to the each port of predefined passage sequential query, the port of first finding data will be selected as transient port; If receive a correct order from transient port, think and receive that the communication port of this order is exactly the communication port of current selection, and give communication port selection marker by current channel selecting sign, complete the selection of communication port;
(3) recognize after available communication port fill order resolving; According to agreement agreement, the packets of information that host is sent here is divided into buffers command bag, three kinds of immediate command bag and data command bags, and order bag type is determined by the first character of received information bag; If buffers command bag performs step (4), data command bag execution step (5), immediate command bag execution step (6), other go to step (7);
(4) receive after buffers command bag, first judge order length and verification and whether correct, if correct, the data that receive are kept in to order reception buffer zone, when host confirms that by check command target machine has correctly received after buffers command, switch to again command execution buffering area, and command execution buffer state is set is to go to step (7) after order ready state;
(5) receive after data command bag, the data that receive are kept in to data receiver buffering area, when host, confirm target machine by check command and correctly received after this data command bag, it is to go to step (7) after data ready that data receiver buffer state is set; By an order, switch to data executive buffer, while carrying out for buffers command;
(6) receive after immediate command bag, according to order bag type, carry out different command functions, give response packet of host loopback simultaneously, and go to step (7); If what receive is the order of ordering in executive buffer, the buffers command of storing in fill order buffering area, the function that buffers command realizes comprises wipes FLASH, upload program or data, download the data of target internal memory, or transfer to assigned address and remove executive program, after being finished, go to step (7);
(7) finish this communications command resolving, go to step (2).
2. the irrelevant communication means of bus protocol according to claim 1, is characterized in that: described host adopts PC, and it is CPU that described target machine adopts SPARC V8 processor.
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