CN106658688B - System and method for realizing GSM module control in single chip microcomputer - Google Patents

Abstract

The invention discloses a system for realizing GSM module control in a single-chip microcomputer, comprising a GSM task scheduling layer, a task processing and cancellation layer, a task execution layer, a function encapsulation layer, a bottom driver layer, and a global variable layer, wherein the GSM The task scheduling layer, the task processing and cancellation layer, the task execution layer, the function encapsulation layer and the underlying driver layer are connected in sequence, and are all connected with the global variable layer. The invention divides the GSM task into the function sequence of the GSM module through the software architecture of five-layer division and a set of global variable layers, and calls the task execution function each time to execute a function encapsulation function, and the function encapsulation function is controlled asynchronously. For AT commands that have a reply in a short time, the reply can be detected synchronously, and the response can be made more quickly. For AT commands with a long reply time, the reply is detected in an asynchronous way, which reduces the waiting time for the reply and reduces the system power consumption.

Description

A system and method for realizing GSM module control in single chip microcomputer

technical field

The invention relates to the field of wireless communication, in particular to an embedded system for realizing low power consumption control of a GSM wireless communication module on a single chip microcomputer and a working method thereof, and more particularly, to an embedded software framework for realizing low power consumption control of a GSM module.

Background technique

The GSM (Global System for Mobile Communication) technology is widely known to the public, and the core module is the GSM wireless communication module, which refers to the GSM standard, which has the functions of sending short messages, voice calls, GPRS data transmission, etc. A software module for all basic functions of a GSM network, also referred to as a GSM module.

Most smart hardware products on the market are equipped with communication modules. According to their needs, WIFI modules, Bluetooth modules, and GSM modules may be selected. Among them, the GSM module has a wide network coverage and small application restrictions, and is one of the most popular communication solutions on intelligent hardware. In general intelligent hardware development, a single-chip microcomputer controls a communication module and other related peripherals. Among them, the communication module is the most complex part, and whether its control logic is perfect directly affects the stability, power consumption, and functionality of the single-chip microcomputer. , which in turn affects the value of the final smart hardware product.

There are roughly two types of software architectures (hereinafter referred to as software architectures) for controlling communication modules through single-chip microcomputers:

(1) Data transparent transmission type: The GSM module is configured as "data transparent transmission mode", and the GSM module is in the open state during the operation cycle of the entire system. This method is simple to program and does not require complicated software design, but the functions of the GSM module that can be used are limited to GPRS data transmission. At the same time, the GSM module is kept on, resulting in high power consumption of the circuit, which is not suitable for products with strict requirements on power consumption.

(2) Synchronous control type: use the AT command to control the GSM module, after issuing an AT command, the program blocks until the GSM module returns the result. In order to prevent the program from locking up, a timeout period is generally set. If the return time exceeds the timeout period, the command is considered to have failed. This method is relatively simple to program, but has certain defects: the return time of AT commands that take a long time is not fixed. If the timeout time is set too short, the command failure rate will be high. Affect the system processing speed. In addition, no matter how the timeout period is set, the system will be blocked to a certain extent, which will degrade the user experience.

The following disadvantages exist in these prior art. In the data transparent transmission type architecture, the GSM module is turned on for a long time, so the power consumption is high. In addition, because the GSM module is continuously turned on, functions other than GPRS data transmission cannot be used. In the synchronous control architecture, it is difficult to properly set the timeout time of long commands. If it is too high, the system will be blocked for a long time. If it is too low, the success rate of the command will be low. Moreover, the existence of system blocking will inevitably lead to the decline of user experience. Further, In the synchronous control logic, the main program code and the GSM module control code are highly coupled, which results in that once the GSM module is replaced, the main program code must be modified accordingly, which greatly increases the workload of developers.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and the purpose of the present invention is achieved through the following technical solutions.

The invention provides a method for realizing GSM module control in a single-chip microcomputer, which is characterized in that the method comprises:

Step S1: Detect whether the module enable command is received, if not, return to the rest of the business logic, continue to wait, if received, determine whether the task to be executed is a GSM task, if not, close the GSM module, if If yes, then go to step S2;

Step S2: perform GSM task scheduling;

Step S3: After the GSM task scheduling is completed, return to the rest of the business logic, and continue to wait for new commands.

Further, the execution method of GSM task scheduling in step S2 includes:

Step S201: the GSM task scheduling layer of the system according to the present invention judges whether the task is in progress, if the task is in progress, enter the task execution processing link, if the task is not in progress, then take out a task from the task queue, and Enter the task execution processing link;

Step S202: in the task execution processing link, determine whether the module has an error, if there is no error, it means that the execution is successful, and exit the current task; if there is an error, add 1 to the value in the error counter, and enter step S203;

Step S203: judging whether the value of the error counter exceeds a preset threshold, if not, correcting the GSM state machine and exiting the current task; if exceeding the threshold, executing the task cancellation operation S204;

Step S204: Execute module detection, if the detection fails, disable the module and exit the current task; if the detection passes, clear the value of the error counter and exit the current task.

Further, the task execution processing link includes:

Step S201-1: According to the asynchronous wait flag, determine whether the asynchronous reply is being waited for, if not, go to step S201-2, if yes, go to step S201-3;

Step S201-2: Determine which task is currently being executed, and call the task execution function according to the task number. If the task execution function fails, set the module error bit in the GSM state variable, and exit the task execution processing link; if the task execution function does not If an error occurs, exit the task execution processing link after the execution is completed;

Step S201-3: Detect whether an asynchronous reply is received, if the asynchronous reply times out or fails, set the module error bit in the GSM state variable, and exit the task execution processing link; if no asynchronous reply time-out or failure is detected, continue the process The asynchronous reply is successfully detected. If the asynchronous reply is successful, the asynchronous wait flag is reset, and the task execution processing link is exited; if the asynchronous response success is still not detected, the task execution processing link is directly exited.

Further, the running method of the task execution function includes:

Step S201-2-a: judge the state of the current module according to the task content, and determine which function encapsulation function needs to be executed;

Step S201-2-b: calling the corresponding function packaging function according to the determined function packaging function number;

Step S201-2-c: Determine whether the function encapsulation function is in error, if there is an error, return "error", otherwise return "normal".

Further, wherein the function encapsulation function combines one or more AT commands for continuous execution, and executes in a synchronous manner for the AT commands that have a reply in a short time;

For an AT command with a long reply time, place the AT command at the end of the function encapsulation function, and set the waiting long reply flag.

Further, the execution method of the function encapsulation function includes:

Step ss1: Execute the AT command that has a reply in a short time, and judge whether the execution is successful, if not, return "failure"; if the execution is successful, set the GSM module state machine in the GSM state variable, and continue to execute subsequent AT commands ;

Step ss2: Execute the AT command of the long-time reply, set the waiting long-reply flag bit, and set the GSM module state machine in the GSM state variable;

Step ss3: After all AT commands are executed, "success" is returned.

Further, the specific command is stored in the long-term AT command list, and the system queries the long-term AT command list when processing the AT command to be executed. If the AT command to be executed is included in the list, the AT command to be executed belongs to If the AT commands that are replied to for a long time are not included in the list, they belong to the AT commands that are replied in a short time.

The present invention also provides a system for realizing GSM module control in the single-chip microcomputer, and the system includes:

The GSM task scheduling layer is used to switch the GSM task, and call the task processing function and the task cancellation function. If a module error is detected, the GSM state machine will be corrected;

The task processing and cancellation layer is used to call the corresponding task processing function according to the current task; when the task needs to be cancelled, the corresponding task cancellation function is called, and the corresponding cancellation work is performed according to the current task;

The task execution layer includes at least one task execution function, and each GSM task corresponds to a task execution function, which is used to call the corresponding function function according to the specific business logic and the current state of the module;

The function encapsulation layer is used to package one or more AT commands to control the GSM module to achieve specific functions;

The underlying driver layer is used to send AT commands and receive and detect replies;

The system also includes a global variable layer, which includes GSM state variables, which are used in the GSM task scheduling layer, the task processing and cancellation layer, the task execution layer, the function encapsulation layer, and the underlying driver layer. exchange of information;

Wherein, the GSM task scheduling layer, the task processing and cancellation layer, the task execution layer, the function encapsulation layer and the underlying driver layer are connected in sequence, and are all connected with the global variable layer.

Further, the GSM state variable is stored with: GSM module state machine, GSM task queue, currently executed task, currently executed functional function, receiving buffer and sending buffer, module error bit, after each function encapsulation is executed successfully. , the GSM module state machine needs to be set.

Further, the underlying driver layer includes three underlying driver functions: a command sending function, a reply receiving function, and a reply detecting function, which are configured to: first, the command sending function clears the receiving buffer, and then sends the content in the sending buffer through the The serial port is sent to the GSM module; secondly, the reply receiving function is called in the serial port interrupt, and the string replied by the serial port is stored in the receiving buffer; and the reply detection function scans the receiving buffer to determine whether there is a reply and the content of the reply.

The present invention is based on an original software architecture for controlling the GSM module on a single-chip microcomputer, and has the following features: 1. The software architecture of the present invention has low power consumption, and is especially suitable for portable intelligent hardware products. 2. The present invention combines synchronous control with asynchronous control to minimize the time consuming of blocking links. 3. Due to the flexibility of the GSM module, the present invention does not have any restrictions on the GPRS data sent and received. 4. The present invention can support two basic GSM functions of sending and receiving short messages and GPRS data transmission. 5. The present invention can realize the encapsulation of the GSM function and the decoupling from the main program code, thereby reducing the amount of code that needs to be rewritten when the GSM module is replaced. Through the improvement of the invention, the low power consumption, high efficiency and high compatibility control of the GSM module can be realized on the single chip microcomputer.

Compared with the existing method, the present invention divides the GSM task into the function sequence of the GSM module through a software architecture of five-layer division and a set of global variables, calls the task execution function each time, and executes a function encapsulation function, which encapsulates the function. The function is controlled asynchronously. For AT commands that have a reply in a short time, the reply can be detected in a synchronous way, and the response can be made more quickly. For AT commands with a long reply time, the reply is detected in an asynchronous way, which greatly reduces the number of responses. The wait time for a reply.

To sum up, the advantages of the present invention are: compared with the data transparent transmission type architecture, the present invention turns off the GSM module when it is idle, and turns it on when there is a task, which can reduce power consumption, and the GSM module does not need to be kept in the GPRS connection state ( It is only turned on when needed), so the short message function can be used; compared with the synchronous control structure, the present invention detects and replies the AT commands that take a long time in an asynchronous way, and can set a larger timeout period than the synchronous way, so it is stable It is more flexible and will not affect the user experience. In addition, the program code that needs to be implemented is clearly packaged and subpackaged. Only the functional package layer is directly related to the GSM module, thus reducing the need for modification when the module changes. number of codes.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

FIG. 1 shows a system frame diagram of implementing GSM module control in a single-chip microcomputer according to an embodiment of the present invention.

FIG. 2 shows a flow chart of the execution of the main program in the system according to the embodiment of the present invention.

FIG. 3 shows a flowchart of a specific execution method of GSM task scheduling according to an embodiment of the present invention.

FIG. 4 shows a flowchart of a specific working method of the task processing and cancellation layer according to an embodiment of the present invention.

FIG. 5 shows a flowchart of a method for running a task execution function according to an embodiment of the present invention.

FIG. 6 shows a flowchart of a method for executing a function encapsulation function according to an embodiment of the present invention.

Detailed ways

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be more thoroughly understood, and will fully convey the scope of the present disclosure to those skilled in the art.

According to the embodiment of the present invention, the present invention includes at least an 8-bit single-chip microcomputer in terms of hardware; a RAM of more than 1KB, of which 512B is used as a receiving buffer and 512B is used as a sending buffer; a GSM module; a serial port connection between the GSM module and the single-chip microcomputer, such as connecting TX and RX Wire. The microcontroller receives the reply from the GSM module through serial port interruption.

In terms of software, the system for realizing GSM module control in a single-chip microcomputer of the present invention includes a five-layer structure. Cancellation layer, task execution layer, function encapsulation layer, underlying driver layer. A set of global variables (GSM state variables) are used to exchange information among the five layers, wherein the composition principle of each layer is arranged according to the level in the program call tree.

Specifically, the GSM state variables store: GSM module state machine, GSM task queue, currently executed tasks, currently executed functional functions, receive buffers and send buffers, module error bits, etc. articulation and control. The GSM task scheduling layer is used to switch the GSM task, and call the task processing function and the task cancellation function. If a module error is detected, the state machine will be corrected. The task processing and cancellation layer calls the corresponding task processing function according to the current task; when the task needs to be cancelled, the corresponding task cancellation function is called, and the corresponding cancellation work is performed according to the current task. The task execution layer includes at least one task execution function, which calls the corresponding function function according to the specific business logic and the current state of the module. Each GSM task has a corresponding task execution function. The function encapsulation layer packs one or more AT commands to control the GSM module to achieve a certain function. After each function package is successfully executed, the state machine of the GSM module needs to be set. The underlying driver layer is used to perform the sending of AT commands and the receiving and detection of replies.

Fig. 2 shows the main program execution flow of the system based on the present invention. In the method for realizing GSM module control in a single-chip microcomputer of the present invention, firstly, the module in the device is detected. If the detection fails, the module is deactivated, and the remaining business logic is entered. If the detection is passed, the remaining business logic is directly entered. and perform the following steps:

Step S1: Detect whether the module enabling command is received, if not, return to the rest of the business logic, continue to wait, if received, determine whether the task to be executed is a GSM task, if not, close the GSM module, if yes , then enter step S2;

Step S2: perform GSM task scheduling;

Step S3: After the GSM task scheduling is completed, return to the rest of the business logic, and continue to wait for new commands.

Wherein, the specific execution method flow of GSM task scheduling in step S2 is shown in Figure 3, including:

Step S201: the GSM task scheduling layer of the system according to the present invention judges whether the task is in progress, if the task is in progress, enter the task execution processing link, if the task is not in progress, then take out a task from the task queue, and Enter the task execution processing link; the task of taking out a task from the task queue is preferably the task with the highest priority;

Step S202: in the task execution processing link, determine whether the module has an error, if there is no error, it means that the execution is successful, and exit the current task; if there is an error, add 1 to the value in the error counter, and enter step S203;

Step S203: judging whether the value of the error counter exceeds a preset threshold, if not, correcting the GSM state machine and exiting the current task; if exceeding the threshold, executing the task cancellation operation S204;

Step S204: Execute module detection, if the detection fails, disable the module and exit the current task; if the detection passes, clear the value of the error counter and exit the current task.

It should be noted that the specific execution process of the GSM task scheduling in the present invention is not only completed by the GSM task scheduling layer in the system. During the execution process, the task processing module and the task cancellation module of the task processing and cancellation layer need to be called to perform task execution processing and task cancellation operations. The task processing module and the task cancellation module respectively include a task execution function and a task cancellation function. In addition, the judging steps in the above steps S202 and S203 may be performed by the task processing module, or may be performed by the GSM task scheduling layer.

The specific working method of the task processing and cancellation layer is shown in Figure 4, and the task execution processing method specifically includes:

Step S201-1: According to the asynchronous wait flag, determine whether the asynchronous reply is being waited for, if not, go to step S201-2, if yes, go to step S201-3;

Step S201-2: Determine which task is currently being executed, and call the task execution function according to the task number, such as calling the task 1 execution function, the task 2 execution function, the task 3 execution function, etc. If the task execution function is wrong, set the GSM state variable module error bit in , and exit the task execution processing link; if there is no error in the task execution function, exit the task execution processing link after the execution is completed;

Step S201-3: Detect whether an asynchronous reply is received, if the asynchronous reply times out or fails, set the module error bit in the GSM state variable, and exit the task execution processing link; if the asynchronous reply time-out or failure is not detected, proceed again The asynchronous reply is successfully detected, so that the correctness of the asynchronous reply is repeatedly determined, and the accuracy of the system operation is improved. If the asynchronous reply is successful, the asynchronous wait flag is reset, and the task execution processing link is exited; if it is still not detected that the asynchronous response is successful, the task execution processing link is directly exited.

The above task execution function is included in the task execution layer of the system, which includes business logic determined according to the task. When the task execution function is called, it judges the function encapsulation function to be executed according to the actual task content, and returns an error/correct according to the execution result of the function encapsulation function, referring to FIG. 5 . The running methods of the task execution function include:

Step S201-2-a: judge the state of the current module according to the task content, and determine which function encapsulation function needs to be executed;

Step S201-2-b: according to the determined result, call the corresponding function encapsulation function, for example, the function 1 encapsulation function, the function 2 encapsulation function, and the function 3 encapsulation function;

Step S201-2-c: Determine whether the function encapsulation function is in error, if there is an error, return "error", otherwise return "normal".

The function encapsulation function is included in the function encapsulation layer of the system of the present invention, which combines one or more AT commands for continuous execution. Specifically, for the AT command that has a reply in a short time, it is carried out in a synchronous manner; and if a long time AT command needs to be executed in the function encapsulation function, the command must be placed at the end of the function encapsulation function, and a long reply wait must be set. bit. If the function encapsulation function is executed successfully, the GSM module state in the GSM state variable needs to be set accordingly. An example flow chart of the execution method of the function encapsulation function of the present invention is shown in FIG. 6 , including:

Step 1: First execute the AT command 1 that has a reply in a short time, and judge whether the execution is successful, if not, return "failure"; if the execution is successful, set the GSM module state machine in the GSM state variable, and continue to execute the follow-up AT command;

Step II: Execute the AT command 2 that has a reply in a short time, and judge whether the execution is successful, if not, return "failure"; if the execution is successful, set the GSM module state machine in the GSM state variable again, and continue to execute the follow-up AT command;

Step III: Execute the AT command 1 of the long reply, set the waiting long reply flag, and set the GSM module state machine in the GSM state variable. The waiting long reply flag bit is used to indicate that the system is waiting for the reply of the long reply AT command 1.

Step IV: After all AT commands are executed, "success" is returned.

In the above method, the number of AT commands that can be replied in a short time is not limited. In FIG. 6, 2 AT commands are used as an illustration, just to make the example clear and easy to understand. In an actual system, the number of AT commands can be one or more. If more than 2, the number of repetitions of step I is changed accordingly. However, it should be noted that if the number of AT commands is too large and the execution time is too long, the maximum delay of each main loop of the system will increase, which will be detrimental to the operation of the system.

In addition, the process corresponding to the AT command 1 with a long-term reply is represented by a dashed box in FIG. 6, because it is an optional option. If there is an AT command with a long-time reply, step III is performed. If there is no AT command, then step III can be used. neglect. Likewise, only one AT command is used here as an illustration, and the actual system may not be limited to one.

Further, the distinguishing standard of the AT command that has a reply in a short time and the AT command that has a reply for a long time can be preset by the developer. For example, a specific command can be set to be an AT command with a long reply, and the rest of the commands are AT commands with a reply in a short time. Specifically, the specific command can be saved in the long-term AT command list, and the system queries the long-term AT command list when distinguishing the type of the AT command to be executed. If the AT command to be executed is included in the list, the Executing an AT command is an AT command with a long-term reply, and if it is not included in the list, it is an AT command with a reply in a short time.

The distinguishing criteria can also be trained by the system, for example, a time threshold t is set, and when the number of times the reply time of the same AT command exceeds t reaches a predetermined limit, the AT command is recorded as a long-time reply AT command, Otherwise, it is recorded as an AT command that has a reply in a short time. The advantage of system training is that the classification of AT commands can be flexibly adjusted according to the actual situation of the system, so that the execution process of AT commands can better adapt to the current platform.

The bottom driver layer includes three bottom driver functions: command sending function, reply receiving function and reply detection function. During specific execution, first, the command sending function clears the receiving buffer, and then sends the content in the sending buffer to the GSM module through the serial port; secondly, the reply receiving function is called in the serial port interrupt, and the string replied by the serial port is stored in the receiving In the cache; in addition, the reply detection function scans the receiving cache to determine whether there is a reply and the content of the reply.

The system for realizing GSM module control in the single-chip microcomputer of the present invention further includes two error handling functions: a GSM state machine correction function and a module detection function. Among them, the GSM state machine correction function is used to send relevant AT commands to confirm the current state of the GSM module when an error occurs in the program, and set the GSM module state machine accordingly, the GSM state machine correction function can be used to perform GSM state machine correction, for example . The module detection function is used to send relevant AT commands to detect whether the module function is normal, and can be used to perform module detection.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. a method for realizing GSM module control in single-chip microcomputer, is characterized in that, described method comprises: Step S1: Detect whether the module enable command is received, if not, return to the rest of the business logic, continue to wait, if received, determine whether the task to be executed is a GSM task, if not, close the GSM module, if If yes, then go to step S2; Step S2: perform GSM task scheduling; Step S3: After the GSM task scheduling is completed, return to the rest of the business logic, and continue to wait for new commands, wherein the execution method of the GSM task scheduling in step S2 includes: Step S201: determine whether the task is in progress by the GSM task scheduling layer, if the task is in progress, then enter the task execution processing link, if the task is not in progress, then take out a task from the task queue, and enter the task execution processing link; Step S202: in the task execution processing link, determine whether the module has an error, if there is no error, it means that the execution is successful, and exit the current task; if there is an error, add 1 to the value in the error counter, and enter step S203; Step S203: judging whether the value of the error counter exceeds a preset threshold, if not, correcting the GSM state machine and exiting the current task; if exceeding the threshold, executing the task cancellation operation S204; Step S204: Execute module detection, if the detection fails, disable the module and exit the current task; if the detection passes, clear the value of the error counter and exit the current task, wherein the tasks described in steps 201 and 202 The execution process includes: Step S201-1: According to the asynchronous wait flag, determine whether the asynchronous reply is being waited for, if not, go to step S201-2, if yes, go to step S201-3; Step S201-2: Determine which task is currently being executed, and call the task execution function according to the task number. If the task execution function fails, set the module error bit in the GSM state variable, and exit the task execution processing link; if the task execution function does not If an error occurs, exit the task execution processing link after the execution is completed; Step S201-3: Detect whether an asynchronous reply is received, if the asynchronous reply times out or fails, set the module error bit in the GSM state variable, and exit the task execution processing link; if no asynchronous reply time-out or failure is detected, continue the process The asynchronous reply is successfully detected. If the asynchronous reply is successful, the asynchronous wait flag is reset, and the task execution processing link is exited; if the asynchronous response success is still not detected, the task execution processing link is directly exited. 2. The method according to claim 1, wherein the running method of the task execution function comprises: Step S201-2-a: judge the state of the current module according to the task content, and determine which function encapsulation function needs to be executed; Step S201-2-b: calling the corresponding function packaging function according to the determined function packaging function number; Step S201-2-c: Determine whether the function encapsulation function is in error, if there is an error, return "error", otherwise return "normal". 3. The method according to claim 2, wherein the function encapsulation function combines one or more AT commands for continuous execution, and for the AT commands that reply in a short time, executes in a synchronous manner; For an AT command with a long reply time, place the AT command at the end of the function encapsulation function, and set the waiting long reply flag. 4. The method of claim 3, wherein the execution method of the function encapsulation function comprises: Step ss1: Execute the AT command that has a reply in a short time, and judge whether the execution is successful, if not, return "failure"; if the execution is successful, set the GSM module state machine in the GSM state variable, and continue to execute subsequent AT commands ; Step ss2: Execute the AT command of the long-time reply, set the waiting long-reply flag bit, and set the GSM module state machine in the GSM state variable; Step ss3: After all AT commands are executed, "success" is returned. 5. The method of claim 4, wherein the specific command is stored in a long-term AT command list, and the system queries the long-term AT command list when processing the AT command to be executed, and if the AT command to be executed is included in the list , the AT command to be executed belongs to an AT command that has been replied for a long time, and if it is not included in the list, it is an AT command that has a reply in a short time. 6. A system for realizing GSM module control in a single-chip microcomputer, for carrying out the method described in any one of claims 1-5, is characterized in that, this system comprises: The GSM task scheduling layer is used to switch the GSM task, and call the task processing function and the task cancellation function. If a module error is detected, the GSM state machine will be corrected; The task processing and cancellation layer is used to call the corresponding task processing function according to the current task; when the task needs to be cancelled, the corresponding task cancellation function is called, and the corresponding cancellation work is performed according to the current task; The task execution layer includes at least one task execution function, and each GSM task corresponds to a task execution function, which is used to call the corresponding function function according to the specific business logic and the current state of the module; The function encapsulation layer is used to package one or more AT commands to control the GSM module to achieve specific functions; The underlying driver layer is used to send AT commands and receive and detect replies; The system also includes a global variable layer, which includes GSM state variables, which are used in the GSM task scheduling layer, the task processing and cancellation layer, the task execution layer, the function encapsulation layer, and the underlying driver layer. exchange of information; Wherein, the GSM task scheduling layer, the task processing and cancellation layer, the task execution layer, the function encapsulation layer and the underlying driver layer are connected in sequence, and are all connected with the global variable layer. 7. system as claimed in claim 6, wherein, in described GSM state variable, keep: GSM module state machine, GSM task queue, the task of current execution, the function function of current execution, receive buffer and send buffer, module error bit, after each function package is successfully executed, the GSM module state machine needs to be set. 8. The system of claim 7, wherein the underlying driver layer comprises three underlying driver functions: a command sending function, a reply receiving function and a reply detecting function, which are configured to: First, the command sending function clears the receiving buffer, and then sends the content in the sending buffer to the GSM module through the serial port; Secondly, call the reply receiving function in the serial port interrupt, and store the string replied by the serial port into the receiving buffer; In addition, the reply detection function scans the receiving buffer to determine whether there is a reply and the content of the reply.

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