CN108540478B - Implementation method of micro base station system for smart power grid - Google Patents
Implementation method of micro base station system for smart power grid Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
The invention discloses a micro base station system for a smart grid and an implementation method, wherein the micro base station system comprises the following steps: the SOC0 chip that ARM chip + Linux operating system formed for with transmit data between the PC end host computer, the SOC1 chip that DSP chip + uCOS operating system formed for with gather the data before the terminal, connect through the serial ports between SOC0 chip and the SOC1 chip. Through the mode, the micro base station system for the smart grid and the implementation method thereof have the advantages that the ARM + DSP chip and the Linux + uCOS operation system are adopted, the size of the whole system is reduced in the remote terminal acquisition system of the smart grid, the hardware cost is reduced, the GSM module is replaced, the GPRS flow cost is saved, and the micro base station system for the smart grid and the implementation method thereof have wide market prospects in popularization.
Description
Technical Field
The invention relates to the field of communication, in particular to a method for realizing a micro base station system for a smart power grid.
Background
The technology used when realizing remote meter reading at present is generally realized by a set of system of a PC upper computer, a large-scale base station, a mobile public network and an acquisition terminal GSM module, so that although the transmission distance is long, the used equipment is expensive, and the base station and the terminal need to pay too much equipment cost, flow cost and maintenance cost, and network congestion or no-signal state exists at the same time. Therefore, it is very necessary to develop a system of a dedicated frequency band for a power grid to realize the collection of the electric meter information by a remote terminal.
Disclosure of Invention
The invention mainly solves the technical problem of providing an implementation method of a micro base station system for a smart grid, which realizes the data forwarding between a network port and a serial port on an SOC of ARM + Linux by adopting an ARM + DSP chip and a Linux + uCOS operation system, analyzes the data sent by an upper computer through the network port by utilizing the existing TCP/IP protocol in the Linux, packages and transmits the data to a UART through processing of some specific formats, reduces the volume of the whole system in a remote terminal acquisition system of the smart grid, compresses the hardware cost, replaces a GSM module, saves the flow GPRS cost, deploys more base stations and terminals under the condition of the same price, and has wide market prospect in the popularization of the implementation method of the micro base station system for the smart grid.
In order to solve the above technical problem, the present invention provides a method for implementing a micro base station system for a smart grid, where the micro base station includes: an SOC0 chip formed by an ARM chip and a Linux operating system is used for transmitting data with a PC end upper computer, an SOC1 chip formed by a DSP chip and a uCOS operating system is used for transmitting data with an acquisition terminal, the SOC0 chip and the SOC1 chip are connected through a serial port,
the implementation method comprises the following steps:
(1) an SOC0 chip is formed by adopting an ARM chip and a Linux operating system:
(a) initializing a serial port:
when the program starts, the serial port UART is initialized, the baud rate is set to be 115200, the valid data bit is 8 bits, the parity bit is 0 bit, the stop bit is 1 bit, the overtime waiting time when the serial port is read and written is 3ms, the minimum character receiving time is 255,
(b) creation thread 1:
after the serial PORT is initialized, a thread 1 is created and specially used for processing data sent by the serial PORT, when the serial PORT data is read, the number of the read data is judged by utilizing a return value of a read function in a while (1) cycle, the maximum value read each time is 255, the read data is put into a global cache buf0[ ], then the read data jumps out of the while (1) cycle through a break instruction, when the serial PORT is read, if no data exists in the serial PORT, the read data is returned after 3 milliseconds, because the timeout time of the read serial PORT is set to be 3 milliseconds before, then the read data enters a data processing function AT _ CMD _ main (), because the sent data comprises IP and PORT character strings, IEC101/104 encapsulated data packets and junk characters, the character strings and AT ^ S ^ 0, SIS, socktcp ^ 0 are firstly compared,
if the same character string is the IP and the PORT, the character string is analyzed through an algorithm, the IP and the PORT are respectively put into an IP buffer IP _ buf [ ] and a PORT buffer PORT _ buf [ ] of the process, a socket of the process is connected with a PC end upper computer, a semaphore is set before a function is bound between the IP and the PORT, whether the semaphore has a signal or not is judged firstly when the IP and the PORT are bound, if not, sleep is blocked, and if so, the semaphore is bound and connected with the PC end upper computer.
If the data is not the IP and PORT character string, then judging whether the data is a data packet encapsulated by IEC101/104, because a character with the total data length is added behind the data packet during data transmission, the data can be judged according to the character during decoding, if the data is the data needing to be uploaded, the data is sent to an upper computer at the PC end by using a socket which is connected in front, thus realizing the uploading channel of the base station, if the data is not the data to be sent, the data is regarded as the junk character to be directly discarded,
(c) creation thread 2:
before sending data to a PC end upper computer by using a socket, a thread 2 is created and is specially used for receiving data from the socket of the PC end upper computer, when the PC end upper computer sends a command, hexadecimal data represented by the PC end upper computer is converted into a corresponding character string, and '\\ r', 'n' is added behind the character string, because the acquisition terminal identifies txt text data in an AT command format,
(d) creation process 1:
in the process 1, socket is used for sending data of the acquisition terminal to a PC upper computer, before sending, the semaphore sem _ NO1 is judged, whether a signal exists or not is judged, the signal can sleep if NO signal exists, the signal exists, and the signal is sent continuously, because the semaphore is +1 when the data is put into a cache buf;
(2) the SOC1 chip is formed by adopting a DSP chip and a uCOS operation system:
(e) creation task 1:
the SOC1 chip transmits data by using UART and intermediate frequency wireless signals, receives and decodes the data sent by the acquisition terminal through the intermediate frequency wireless module in task 1, puts the data into a buffer BUF _0, judges which acquisition terminal the data belongs to according to the frame number and the subframe number when the data are received, then judges whether the data are retransmitted or lost by using the receiving address recv _ id and the transmitting address send _ id contained in the data,
(f) creation task 2:
in task 2, the data decoded by task 1 is sent to SOC0 through a serial port, when data is fetched from BUF _0, the fetched character string is processed according to the length that the data character string starts with 'AT' or data is written according to a writing instruction, if the character string is not the character in the above two conditions, the character string is discarded as a junk character,
(g) creation task 3:
and in the task 3, a command sent by the PC side upper computer is sent to the acquisition terminal, which acquisition terminal should be sent is judged according to the user information in the structure usr _ info, and whether the data is successfully transmitted and whether the data is updated and sent again is judged according to the receiving address recv _ id, the transmission address send _ id and the confirmation character flag ack _ flag when the data is sent.
In a preferred embodiment of the present invention, the length of the data to be written by the write command in step (f) is the length of the data to be sent next time.
The invention has the beneficial effects that: the method for realizing the micro base station system for the intelligent power grid realizes the data forwarding between the network port and the serial port on the SOC of ARM + Linux by utilizing the ARM + DSP chip and the Linux + uCOS operating system, analyzes the data sent by the upper computer through the network port by utilizing the existing TCP/IP protocol in the Linux, packages and transmits the data to the UART by processing in certain specific formats, reduces the volume of the whole system in the remote terminal acquisition system of the intelligent power grid, compresses the hardware cost, replaces a GSM module, saves the GPRS flow cost, deploys more base stations and terminals under the condition of the same price, and has wide market prospect in the popularization of the method for realizing the micro base station system for the intelligent power grid.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic structural diagram of a preferred embodiment of a method for implementing a micro base station system for a smart grid according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 invention.
Referring to fig. 1, an embodiment of the present invention includes:
an implementation method of a micro base station system for a smart grid is provided, wherein the micro base station comprises: an SOC0 chip formed by an ARM chip and a Linux operating system is used for transmitting data with a PC end upper computer, an SOC1 chip formed by a DSP chip and a uCOS operating system is used for transmitting data with an acquisition terminal, the SOC0 chip and the SOC1 chip are connected through a serial port,
the implementation method comprises the following steps:
(1) an SOC0 chip is formed by adopting an ARM chip and a Linux operating system:
(a) initializing a serial port:
when the program starts, the serial port UART is initialized, the baud rate is set to be 115200, the valid data bit is 8 bits, the parity bit is 0 bit, the stop bit is 1 bit, the overtime waiting time when the serial port is read and written is 3ms, the minimum character receiving time is 255,
(b) creation thread 1:
after the serial PORT is initialized, a thread 1 is created and specially used for processing data sent by the serial PORT, when the serial PORT data is read, the number of the read data is judged by utilizing a return value of a read function in a while (1) cycle, the maximum value read each time is 255, the read data is put into a global cache buf0[ ], then the read data jumps out of the while (1) cycle through a break instruction, when the serial PORT is read, if no data exists in the serial PORT, the read data is returned after 3 milliseconds, because the timeout time of the read serial PORT is set to be 3 milliseconds before, then the read data enters a data processing function AT _ CMD _ main (), because the sent data comprises IP and PORT character strings, IEC101/104 encapsulated data packets and junk characters, the character strings and AT ^ S ^ 0, SIS, socktcp ^ 0 are firstly compared,
if the same character string is the IP and the PORT, the character string is analyzed through an algorithm, the IP and the PORT are respectively put into an IP buffer IP _ buf [ ] and a PORT buffer PORT _ buf [ ] of the process, a socket of the process is connected with a PC end upper computer, a semaphore is set before a function is bound between the IP and the PORT, whether the semaphore has a signal or not is judged firstly when the IP and the PORT are bound, if not, sleep is blocked, and if so, the semaphore is bound and connected with the PC end upper computer.
If the data is not the IP and PORT character string, then judging whether the data is a data packet encapsulated by IEC101/104, because a character with the total data length is added behind the data packet during data transmission, the data can be judged according to the character during decoding, if the data is the data needing to be uploaded, the data is sent to an upper computer at the PC end by using a socket which is connected in front, thus realizing the uploading channel of the base station, if the data is not the data to be sent, the data is regarded as the junk character to be directly discarded,
(c) creation thread 2:
before sending data to a PC end upper computer by using a socket, a thread 2 is created and is specially used for receiving data from the socket of the PC end upper computer, when the PC end upper computer sends a command, hexadecimal data represented by the PC end upper computer is converted into a corresponding character string, and '\\ r', 'n' is added behind the character string, because the acquisition terminal identifies txt text data in an AT command format,
(d) creation process 1:
in the process 1, socket is used for sending data of the acquisition terminal to a PC upper computer, before sending, the semaphore sem _ NO1 is judged, whether a signal exists or not is judged, the signal can sleep if NO signal exists, the signal exists, and the signal is sent continuously, because the semaphore is +1 when the data is put into a cache buf;
(2) the SOC1 chip is formed by adopting a DSP chip and a uCOS operation system:
(e) creation task 1:
the SOC1 chip transmits data by using UART and intermediate frequency wireless signals, receives and decodes the data sent by the acquisition terminal through the intermediate frequency wireless module in task 1, puts the data into a buffer BUF _0, judges which acquisition terminal the data belongs to according to the frame number and the subframe number when the data are received, then judges whether the data are retransmitted or lost by using the receiving address recv _ id and the transmitting address send _ id contained in the data,
(f) creation task 2:
in task 2, the data decoded by task 1 is sent to SOC0 through a serial port, when data is fetched from BUF _0, the fetched character string is processed according to the length that the data character string starts with 'AT' or data is written according to a writing instruction, if the character string is not the character in the above two conditions, the character string is discarded as a junk character,
(g) creation task 3:
and in the task 3, a command sent by the PC side upper computer is sent to the acquisition terminal, which acquisition terminal should be sent is judged according to the user information in the structure usr _ info, and whether the data is successfully transmitted and whether the data is updated and sent again is judged according to the receiving address recv _ id, the transmission address send _ id and the confirmation character flag ack _ flag when the data is sent.
Preferably, the length of the data to be written by the write command in step (f) is the length of the data to be sent next time.
The implementation of the micro base station mainly utilizes an ARM + DSP chip and a Linux + uCOS operating system, the data forwarding between a network port and a serial port is implemented on an SOC of the ARM + Linux, the existing TCP/IP protocol in the Linux is utilized, the data sent by an upper computer is analyzed through the network port, then the data is packaged and transmitted to the UART through the processing of some specific formats, and when the base station operates, most importantly, when the base station is powered on and started, the APP program can be ensured to operate along with the starting of the system, and the APP process is ensured not to be killed, so that the user only needs to add the following instruction/etc/S90 server into a Linux system directory/etc/inittab file. Indicating that the respawn S90server process is started after the init process is started and is restarted as soon as it is found dead. The SOC of the DSP + uCOS realizes that data transmitted by a UART at an ARM end is received and put into a BUF, a 4096-byte annular buffer area is utilized to add a semaphore, when the data is put in, the semaphore increases along with the number of the written data, and when the data is read out, the semaphore also decreases along with the number of the read data. Therefore, the stability of data transmission between the two SOCs is ensured, and when the base station receives data sent by the PC end upper computer, the base station needs to know which terminal the data is sent to, because the system is a mode that the base station drags 64 terminals, the problem is solved: that is, data is transmitted to a fixed terminal in a fixed time slot, such as: the frame number of the base station is 0-63, the subframe number is 0-9, therefore, the data can be sent to the terminal No. 1 in the frame number 1, the data can be transmitted for many times in the subframe number 0-9, and some check bits and ACK information are added in the data packet, thereby preventing the phenomena of packet loss and retransmission.
The method for realizing the micro base station system of the smart power grid has the beneficial effects that:
by adopting an ARM + DSP chip and a Linux + uCOS operation system, the forwarding of data between a network port and a serial port is realized on an SOC of the ARM + Linux, the existing TCP/IP protocol in the Linux is utilized, the data sent by an upper computer is analyzed through the network port, then the data is packaged and transmitted to a UART through the processing of some specific formats, the size of the whole system is reduced in an intelligent power grid remote terminal acquisition system, the hardware cost is reduced, a GSM module is replaced, the GPRS flow cost is saved, and more base stations and terminals can be deployed under the condition of the same price.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. An implementation method of a micro base station system for a smart grid is characterized in that the micro base station comprises: an SOC0 chip formed by an ARM chip and a Linux operating system is used for transmitting data with a PC end upper computer, an SOC1 chip formed by a DSP chip and a uCOS operating system is used for transmitting data with an acquisition terminal, the SOC0 chip and the SOC1 chip are connected through a serial port,
the implementation method comprises the following steps:
(1) an SOC0 chip is formed by adopting an ARM chip and a Linux operating system:
(a) initializing a serial port:
when the program starts, the serial port UART is initialized, the baud rate is set to be 115200, the valid data bit is 8 bits, the parity bit is 0 bit, the stop bit is 1 bit, the overtime waiting time when the serial port is read and written is 3ms, the minimum character receiving time is 255,
(b) creation thread 1:
after the serial PORT is initialized, a thread 1 is created and specially used for processing data sent by the serial PORT, the number of read data is judged by using a return value of a read function in a while (1) cycle when the serial PORT data is read, the maximum value read each time is 255, the read data is put into a global cache buf0[ ], then the read data jumps out of the while (1) cycle through a break instruction, if no data exists in the read serial PORT, the read data is returned after 3 milliseconds, because the timeout time for reading the serial PORT is set to be 3 milliseconds before, then the read data enters a data processing function AT _ CMD _ main (), because the sent data comprises IP and PORT character strings, data packets packaged by IEC101/104 and junk characters, the character strings and PORT character strings are firstly
"AT ^ SISS ═ 0, address, socktcp://" for comparison,
if the same character string is the IP and the PORT, the character string is analyzed through an algorithm, the IP and the PORT are respectively put into an IP buffer IP _ buf [ ] and a PORT buffer PORT _ buf [ ] of the process, a socket of the process is connected with a PC end upper computer, a semaphore is set before a function is bound between the IP and the PORT, whether the semaphore has a signal or not is judged firstly when the IP and the PORT are bound, if not, sleep is blocked, and if so, the semaphore is bound and connected with the PC end upper computer;
if the data is not the IP and PORT character string, then judging whether the data is a data packet encapsulated by IEC101/104, because a character with the total data length is added behind the data packet during data transmission, the data can be judged according to the character during decoding, if the data is the data needing to be uploaded, the data is sent to an upper computer at the PC end by using a socket which is connected in front, thus realizing the uploading channel of the base station, if the data is not the data to be sent, the data is regarded as the junk character to be directly discarded,
(c) creation thread 2:
before sending data to a PC end upper computer by using a socket, a thread 2 is created and is specially used for receiving data from the socket of the PC end upper computer, when the PC end upper computer sends a command, hexadecimal data represented by the PC end upper computer is converted into a corresponding character string, and '\\ r', 'n' is added behind the character string, because the acquisition terminal identifies txt text data in an AT command format,
(d) creation process 1:
in the process 1, socket is used for sending data of the acquisition terminal to a PC upper computer, before sending, the semaphore sem _ NO1 is judged, whether a signal exists or not is judged, the signal can sleep if NO signal exists, the signal exists, and the signal is sent continuously, because the semaphore is +1 when the data is put into a cache buf;
(2) the SOC1 chip is formed by adopting a DSP chip and a uCOS operation system:
(e) creation task 1:
the SOC1 chip transmits data by using UART and intermediate frequency wireless signals, receives and decodes the data sent by the acquisition terminal through the intermediate frequency wireless module in task 1, puts the data into a buffer BUF _0, judges which acquisition terminal the data belongs to according to the frame number and the subframe number when the data are received, then judges whether the data are retransmitted or lost by using the receiving address recv _ id and the transmitting address send _ id contained in the data,
(f) creation task 2:
in task 2, the data decoded by task 1 is sent to SOC0 through a serial port, when data is fetched from BUF _0, the fetched character string is processed according to the length that the data character string starts with 'AT' or data is written according to a writing instruction, if the character string is not the character in the above two conditions, the character string is discarded as a junk character,
(g) creation task 3:
and in the task 3, a command sent by the PC side upper computer is sent to the acquisition terminal, which acquisition terminal should be sent is judged according to the user information in the structure usr _ info, and whether the data is successfully transmitted and whether the data is updated and sent again is judged according to the receiving address recv _ id, the transmission address send _ id and the confirmation character flag ack _ flag when the data is sent.
2. The method of claim 1, wherein the length of the data to be written in the write command in step (f) is the length of the data to be transmitted next time.
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