CN110928817A - Communication method, device and storage medium for double-core electric energy meter - Google Patents
Communication method, device and storage medium for double-core electric energy meter Download PDFInfo
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- CN110928817A CN110928817A CN201911382562.6A CN201911382562A CN110928817A CN 110928817 A CN110928817 A CN 110928817A CN 201911382562 A CN201911382562 A CN 201911382562A CN 110928817 A CN110928817 A CN 110928817A
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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
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
- G06F13/28—Handling requests for interconnection or transfer for access to input/output bus using burst mode transfer, e.g. direct memory access DMA, cycle steal
- G06F13/285—Halt processor DMA
Abstract
The application discloses a communication method, equipment and a storage medium for a double-core electric energy meter, wherein the method comprises the following steps: dividing a message sent by a management unit into a message header and a message body, and sending the message header and the message body to a metering unit of the double-core electric energy meter; formulating a first response message format and a second response message format of the metering unit, and when response data of the metering unit is ready, replying the first response message format to the management unit; and when the response data of the metering unit is not ready, the response data is returned to the management unit according to the second response message format. The problem of SPI high speed communication data's overrun among the prior art has been solved to this application, but there is simulation speed slow, and measurement unit sends data to the management unit through the interrupt mode because the interrupt of higher priority breaks and leads to the SPI bus to send wrong data, leads to the management unit to receive wrong byte data and makes the technical problem of final message distortion.
Description
Technical Field
The present application relates to the field of superconducting power technology, and in particular, to a communication method, device, and storage medium for a two-core electric energy meter.
Background
The dual-core electric energy meter with the separated legal method is composed of a management unit and a metering unit, the management unit is connected with the metering unit through a communication interface, a common communication interface in the electric energy meter is UART, when the interactive data volume between the management unit and the metering unit is larger and larger, the communication rate of the UART adopted in dual-core communication is difficult to reach the communication rate of 1Mbps, the communication rate of the UART is difficult to meet the high-speed communication requirement, and the UART needs the rate matching of two communication parties, and the two communication parties need to set the same communication rate.
The communication rate can also be improved through the SPI in the two-core communication, the limitation that the same communication rate is set by two parties is avoided, the data can be received and sent by the interruption of the SPI in the traditional simple two-core SPI communication scheme, and the problem that the data is lost or wrong byte data is received when the SPI rate is higher and higher by the interruption of the SPI. In this way, as the SPI communication rate is higher, SPI received data may be discarded due to data overrun, and the Slave side using an interrupt mode to send data to the Master may also cause the SPI bus to send wrong data because the interrupt is interrupted by a higher priority interrupt, causing the Master to receive wrong byte data, so that the final message is distorted.
Disclosure of Invention
The application provides a communication method, equipment and a storage medium for a double-core electric energy meter, which solve the problem of overrun of SPI high-speed communication data in the prior art, but have the technical problems that the simulation speed is low, when a metering unit sends data to a management unit in an interruption mode, the interruption is interrupted by interruption with higher priority, so that an SPI bus sends wrong data, and the management unit receives wrong byte data, so that the final message is distorted.
The application provides a communication method for a two-core electric energy meter in a first aspect, which comprises the following steps:
dividing a message sent by a management unit into a message header and a message body, and sending the message header and the message body to a metering unit of a double-core electric energy meter;
formulating a first response message format and a second response message format of the metering unit, and when response data of the metering unit is ready, replying the first response message format to the management unit; and when the response data of the metering unit is not ready, replying to the management unit according to the second response message format.
Optionally, the measuring unit that divides the message sent by the management unit into a message header and a message body, and sends the message header and the message body to the dual-core electric energy meter further includes: and the metering unit receives the message header through the DMA.
Optionally, a first response message format and a second response message format of the metering unit are formulated, and when response data of the metering unit is ready, the first response message format is returned to the management unit; when the response data of the metering unit is not ready, replying to the management unit according to the second response message format, further comprising:
and the metering unit replies to the management unit through the DMA according to the first response message format.
Optionally, a first response message format and a second response message format of the metering unit are formulated, and when response data of the metering unit is ready, the first response message format is replied according to the message header and the message body; when the response data of the metering unit is not ready, replying the second response message format according to the message header and the message body, and the method further comprises the following steps:
and the metering unit replies to the management unit through the DMA according to the second response message format.
Optionally, the first reply packet format specifically includes: a two-byte data OK flag CB, a response data body, and a four-byte end flag AD.
Optionally, the second response packet format specifically includes: two bytes of data not OK flag BC and four bytes end flag AD.
Optionally, the replying to the management unit according to the first reply packet format further includes: and receiving a query command and replying to the management unit according to the first response message format.
Optionally, the replying to the management unit according to the second response packet format further includes: and receiving a query command and replying to the management unit according to the second response message format.
A second aspect of the present application provides a communication device for a two-core electric energy meter, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute a communication method for a two-core electric energy meter according to the first aspect according to instructions in the program code.
A third aspect of the present application provides a computer-readable storage medium for storing program code for executing the communication method for a two-core electric energy meter according to the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a communication method for a double-core electric energy meter, which comprises the following steps:
dividing a message sent by a management unit into a message header and a message body, and sending the message header and the message body to a metering unit of a double-core electric energy meter;
formulating a first response message format and a second response message format of the metering unit, and when response data of the metering unit is ready, replying the first response message format to the management unit; and when the response data of the metering unit is not ready, replying to the management unit according to the second response message format.
According to the communication method for the double-core electric energy meter, the message sent by the management unit is sent to the metering unit in a mode of dividing the message into the message header and the message body, so that the metering unit can receive data by using a DMA mechanism, and the problem of overrun of SPI high-speed communication data is solved; meanwhile, two response message formats of the metering unit are set, one is used for replying the management unit when the metering unit is ready to respond to data, and the other is used for replying the management unit when the metering unit is not ready to respond to data, so that the technical problem that the management unit receives wrong byte data to distort the final message due to the fact that the SPI bus sends wrong data due to interruption caused by interruption of higher-priority interruption when the metering unit sends data to the management unit in an interruption mode is solved. The communication method for the double-core electric energy meter solves the problem of overrun of SPI high-speed communication data in the prior art, but has the technical problems that the simulation speed is low, when the metering unit sends data to the management unit in an interruption mode, the interruption is interrupted by interruption with higher priority, the SPI bus sends wrong data, and the management unit receives wrong byte data, so that the final message is distorted.
Drawings
Fig. 1 is a schematic flow chart diagram illustrating an embodiment of a communication method for a two-core electric energy meter provided in the present application;
fig. 2 is a schematic flow chart of another embodiment of a communication method for a two-core electric energy meter provided by the present application;
fig. 3 is a SPI communication flow chart of a communication method for a two-core electric energy meter provided by the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a communication method, equipment and a storage medium for a double-core electric energy meter, and solves the problem of overrun of SPI high-speed communication data in the prior art, but the technical problems that the simulation speed is low, and when a metering unit sends data to a management unit in an interruption mode, the interruption is interrupted by interruption with higher priority, so that an SPI bus sends wrong data, and the management unit receives wrong byte data, so that the final message is distorted exist.
The metering unit is a legal metering unit which has the functions of metering, displaying, clock, data storage and the like in the dual-core electric energy meter separated by the legal method and can be verified by the requirement of type evaluation. The management unit is a function unit of the double-core electric energy meter which is designed according to the user requirement and separated by an extensible method, and can integrate the functions of load identification, electric energy quality management and the like.
For ease of understanding, referring to fig. 1, fig. 1 is a schematic flow chart diagram of an embodiment of a communication method for a two-core electric energy meter provided herein;
the first aspect of the embodiments of the present application provides a communication method for a two-core electric energy meter, including:
100, dividing a message sent by a management unit into a message header and a message body, and sending the message header and the message body to a metering unit of the double-core electric energy meter;
200, formulating a first response message format and a second response message format of the metering unit, and when response data of the metering unit is ready, replying the first response message format to the management unit; and when the response data of the metering unit is not ready, the response data is returned to the management unit according to the second response message format.
It should be noted that, in the communication method for the two-core electric energy meter provided in the embodiment of the present application, considering the SPI with the transmission rate of 1Mbps, only 1us is needed for transmitting 1bit, and only 8us is needed for transmitting 1 byte, if the receiving is performed in an interrupt manner, data will be lost if the MCU is not interrupted in time, but the data is not available in an inquiry manner because it is impossible to stop the metering unit or the management unit and perform only SPI receiving. Therefore, the data can only be received through the DMA, but the number of bytes of the transmission needs to be known through the DMA; therefore, when the management unit sends data to the metering unit, the metering unit needs to know the length of the data sent by the management unit this time. For this purpose, the transmission may be divided into two parts, one part being the header and the other part being the body. The message header is of a fixed length and mainly used for describing the length of a message body, the message header is designed into an FE of one byte, the length of the message body of two bytes and an SUM of one byte (the SUM is the accumulated SUM of 3 bytes before the message body);
the messages sent by the management unit are therefore as in table 1:
| 1 byte FE | Two byte message body length | One byte SUM |
Table 1 structural composition of transmission message
The message body is effective data which is actually transmitted, and the length of the message body is the length specified by the message header. In particular, the header format is not limited in this application, and a similar header format may also be used.
Meanwhile, in order to solve the problem of asynchronous response of the metering unit and how the management unit maintains the clock, a metering unit response data ready response message format and a metering unit non-ready response message format are set for the problem, when the metering unit receives a request message of the management unit, and when the metering unit is ready to respond to the response data of the request message, the metering unit replies the management unit response data ready response message format; when the metering unit is not ready to respond to the response data of the request message, the metering unit replies to the management unit that the response data is not in a ready response message format. The format of the measurement unit response data ready response message and the format of the measurement unit response data ready response message are not limited herein, and the field value in the message format is only exemplary and may be other values.
For ease of understanding, referring to fig. 2 and 3, fig. 2 is a schematic flow chart diagram of another embodiment of a communication method for a two-core electric energy meter provided herein; fig. 3 is a SPI communication flow chart of a communication method for a two-core electric energy meter provided by the present application.
Further, the measurement unit that divides the message sent by the management unit into a message header and a message body and sends the message header and the message body to the dual-core electric energy meter further comprises: the metering unit receives the header 210 via DMA.
It should be noted that, referring to the flowchart in fig. 3, it can be known that the metering unit receives the 4-byte header sent from the management unit through DMA.
Further, a first response message format and a second response message format of the metering unit are formulated, and when response data of the metering unit are prepared, the first response message format is returned to the management unit; when the response data of the metering unit is not ready, the management unit is replied according to a second response message format, and the method further comprises the following steps:
and the metering unit replies to the management unit through the DMA according to the first response message format.
It should be noted that, referring to the flowchart in fig. 3, when the metering unit receives the request message from the management unit, if the metering unit is ready to respond to the data message format, the first response message format, that is, the ready to respond to the data message format, may be configured through the DMA, and the first response message format is returned to the management unit.
Further, a first response message format and a second response message format of the metering unit are established, and when response data of the metering unit are prepared, the first response message format is replied according to the message header and the message body; when the response data of the metering unit is not ready, replying a second response message format according to the message header and the message body, and the method further comprises the following steps:
and the metering unit replies to the management unit through the DMA according to the second response message format.
It should be noted that, referring to the flowchart in fig. 3, when the metering unit receives the request message from the management unit, if the metering unit does not prepare the format of the response data message, the second response message format, that is, the format of the response data message is not prepared, may be configured through the DMA, and the second response message format is returned to the management unit.
Further, the first reply packet format specifically includes: a two-byte data OK flag CB, a response data body, and a four-byte end flag AD.
It should be noted that the first response packet format, i.e. the response data ready response packet format, includes a two-byte data OK flag CB, a response data packet body, and a four-byte end flag AD.
Further, the second response packet format specifically includes: two bytes of data not OK flag BC and four bytes end flag AD.
It should be noted that the second response message format, that is, the response data not ready response message format, includes a data not OK flag BC of two bytes and a four-byte end flag AD.
Further, the reply is sent to the management unit according to the first reply message format, which includes: and receiving the query command and replying to the management unit according to the first response message format.
It should be noted that, referring to the flowchart in fig. 3, the embodiment of the present application designs the following mechanism to receive the response from the metering unit side:
after a metering unit (Master in the figure) side receives a request message of a management unit, a communication task of the metering unit (Slave in the figure) side is scheduled to run, a response message is obtained and constructed in the communication task of the metering unit side, and a data OK mark is arranged;
after the management unit side sends the request message, the management unit side delays to send a query command to the metering unit side by 100 ms;
the management unit side sends a query command to the metering unit side through the SPI by pulling down the CS in a communication task of the management unit side;
the measuring unit side receives the CS interruption, and if the data is OK, the measuring unit response data is directly sent through the DMA to prepare a response message; if the data is not OK, the metering unit side sends a metering unit response data without ready response message, and the management unit side continues to delay 100ms and then sends a query command to the metering unit side if the management unit side receives the metering unit response data without ready response message;
because the metering unit data is ready and the metering unit data is not ready, the response message has 4 bytes of AD at last, the management unit side receives the 4 bytes of AD, and the SPI clock is stopped when the data transmission is stopped.
Further, replying to the management unit according to the second reply message format further includes: and receiving the query command and replying to the management unit according to the second response message format.
It should be noted that, after sending its request message, the management unit sends a query command to the metering unit after 100ms delay; the management unit side sends a query command to the metering unit side through the SPI by pulling down the CS in a communication task of the management unit side; the measuring unit side receives the CS interruption, and if the data is OK, the measuring unit response data is directly sent through the DMA to prepare a response message; if the data is not OK, the metering unit side sends a metering unit response data without ready response message, and the management unit side continues to delay 100ms and then sends a query command to the metering unit side if the management unit side receives the metering unit response data without ready response message; because the metering unit data is ready and the metering unit data is not ready, the response message has 4 bytes of AD at last, the management unit side receives the 4 bytes of AD, and the SPI clock is stopped when the data transmission is stopped.
According to the method and the device, the sending message is divided into the message header and the message body to be sent, so that the metering unit can start the DMA to receive data, the phenomenon that the received data bytes are discarded due to interruption discarding in an interruption mode is effectively prevented, and the whole message is invalid as long as one byte of data is discarded for one message. By constructing the format that the response data of the metering unit is not ready to respond to the message, when the metering unit is not ready to respond to the data, the management unit is quickly responded when the query command of the management unit is received, so that the communication time is saved, and the data processing efficiency of both the management unit and the metering unit is improved. By the fact that the constructed response message format contains the 4-byte end mark AD, the management unit can quickly recognize the end of the transmission of the management unit.
A second aspect of the present application provides a communication device for a two-core electric energy meter, the device comprising a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute a communication method for the two-core electric energy meter of the foregoing embodiments according to instructions in the program code.
A third aspect of the present application provides a computer-readable storage medium for storing program code for executing a communication method for a two-core electric energy meter of the foregoing embodiments.
The terms "comprises," "comprising," and any other variation thereof in the description and the drawings described above are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A communication method for a two-core electric energy meter, comprising:
dividing a message sent by a management unit into a message header and a message body, and sending the message header and the message body to a metering unit of a double-core electric energy meter;
formulating a first response message format and a second response message format of the metering unit, and when response data of the metering unit is ready, replying the first response message format to the management unit; and when the response data of the metering unit is not ready, replying to the management unit according to the second response message format.
2. The communication method for the two-core electric energy meter according to claim 1, wherein the dividing the message sent by the management unit into a message header and a message body, and sending the message header and the message body to the metering unit of the two-core electric energy meter further comprises: and the metering unit receives the message header through the DMA.
3. The communication method for the two-core electric energy meter according to claim 1, wherein the first response message format and the second response message format of the metering unit are established, and when the response data of the metering unit is ready, the first response message format is returned to the management unit; when the response data of the metering unit is not ready, replying to the management unit according to the second response message format, further comprising:
and the metering unit replies to the management unit through the DMA according to the first response message format.
4. The communication method for the two-core electric energy meter according to claim 1, wherein the first response message format and the second response message format of the metering unit are established, and when the response data of the metering unit is ready, the first response message format is replied according to the message header and the message body; when the response data of the metering unit is not ready, replying the second response message format according to the message header and the message body, and the method further comprises the following steps:
and the metering unit replies to the management unit through the DMA according to the second response message format.
5. The communication method for the two-core electric energy meter according to claim 1, wherein the first reply message format specifically includes: a two-byte data OK flag CB, a response data body, and a four-byte end flag AD.
6. The communication method for the two-core electric energy meter according to claim 1, wherein the second reply message format specifically includes: two bytes of data not OK flag BC and four bytes end flag AD.
7. The communication method for a two-core electric energy meter according to claim 1, wherein the reply to the management unit according to the first reply message format further comprises: and receiving a query command and replying to the management unit according to the first response message format.
8. The communication method for a two-core electric energy meter according to claim 1, wherein the reply to the management unit according to the second reply message format further comprises: and receiving a query command and replying to the management unit according to the second response message format.
9. A communication device for a two-core electric energy meter, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute a communication method for a two-core electric energy meter according to any one of claims 1 to 8 according to instructions in the program code.
10. A computer-readable storage medium for storing a program code for performing a communication method for a two-core electric energy meter according to any one of claims 1 to 8.
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