WO2017075852A1

WO2017075852A1 - Method and system for protecting working program of mcu

Info

Publication number: WO2017075852A1
Application number: PCT/CN2015/095517
Authority: WO
Inventors: 陈海燕; 王志刚
Original assignee: 邦彦技术股份有限公司
Priority date: 2015-11-05
Filing date: 2015-11-25
Publication date: 2017-05-11
Also published as: CN105354061A

Abstract

A method and system for protecting a working program of an MCU. The method comprises the steps of: S1, running a download program; and S2, determining, by the download program, whether a working program is to be run or needs to be upgraded, if the working program is to be run, entering step S3, and if the working program needs to be upgraded, entering step S4. The system comprises an MCU, an external storage module, and a memory. First, the download program is burned into a flash of the MCU, the MCU runs the download program after being powered on, and then the download program upgrades the working program or is responsible for running the working program, so that the working program can still be easily upgraded and run after being deleted; second, the download program is stored by a part of sector of the external storage module, and the working program is stored by the other part of sector, so that MCU interface bus resources are reduced, thereby reducing costs. The method and system are widely applicable to various management systems for a working program of an MCU.

Description

Method and system for protecting MCU working program

Technical field

The present invention relates to the field of chip work program control, and in particular, to a method and system for protecting an MCU work program.

Background technique

MCU: Microcontroller Unit, Micro Control Unit.

Memory: Running memory refers to the memory when the MCU runs the program, also called RAM (referred to as the memory).

FLASH: Flash, the English name of the flash is "Flash" Memory", generally referred to as "Flash", is a type of memory device and is a kind of non-volatile memory.

At present, some electronic products have automatic destruction procedures due to special needs. After an emergency triggers the destruction process, the work program is deleted. If the device is to be used again, the program needs to be re-burned, which is inconvenient for use.

Summary of the invention

In order to solve the above technical problem, an object of the present invention is to provide a method for protecting a working MCU that can facilitate the upgrading of a working program, is convenient to use, and reduces the occupation of an MCU bus resource.

In order to solve the above technical problem, another object of the present invention is to provide a protection MCU working program system which can facilitate the upgrading of the working program, is convenient to use, and reduces the occupation of the MCU bus resources.

The technical solution adopted by the invention is:

A method for protecting an MCU working program, comprising the steps of: S1, running a downloading program; S2, determining, by the downloading program, whether the working program should be run or should be upgraded, and if the working program is running, proceeding to step S3, if an upgrade is required The program proceeds to step S4; S3, the download program moves the working program code from the external storage module to the corresponding address in the memory, and the MCU runs the working program after the completion of the movement; S4, the MCU receives the working program from the upper computer, and the download program works. The program is written to the corresponding location in the external memory module, and then resets to repeat steps S1 and S2.

Preferably, the download program and the work program are stored in different storage sectors of the same external storage module.

Preferably, the external storage module is a FLASH memory.

Preferably, the method for protecting the working program of the MCU further comprises the steps of: S01, first moving the BOOT code from the external storage module into the memory, and then running the BOOT code; S02, the BOOT code performing the action: moving the download program from the external storage module And / or work program to the corresponding address in the memory, after the completion of the move, perform step S1.

A system for protecting an MCU working program, the system for implementing a method for protecting an MCU working program, the system comprising: an MCU, respectively connected to an external storage module and a memory, for running a downloading program and a working program; and an external storage module The external storage module includes a first storage sector for storing a download program, a second storage sector for storing a work program, and a memory for The MCU's commands store download programs and/or work programs.

Preferably, the first storage sector stores a BOOT code for guiding the MCU to move and run the download program and/or the work program.

Preferably, the external storage module is a FLASH memory.

The beneficial effects of the invention are:

The invention firstly downloads the program by burning in the FLASH of the MCU, and after the MCU is powered on, the downloading program is run, and then the downloading program is used to upgrade the working program or to run the working program, so that the working program can be conveniently deleted after being deleted. The implementation is upgraded and run. Secondly, by using a part of the sector storage program of the external storage module, another part of the sector stores the working program, which saves the MCU interface bus resources, thereby saving cost; again, the invention has high security and convenient use. The operation is stable and reliable, with good economic and social benefits.

The invention can be widely applied to various MCU work program management systems.

DRAWINGS

The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings:

1 is a schematic structural diagram of an embodiment of a system for protecting an MCU working program according to the present invention.

detailed description

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

For the problems raised in the background art, the method can be implemented as follows: in the FLASH memory of the MCU, the download program is first burned, the download program is run after the MCU is powered on, and then the download program is used to upgrade the work program or to run the work program. This way, when the work program is deleted, it can still be easily upgraded and run. The implementation of the above method can be realized by externally connecting two pieces of FLASH memory, one piece of storage downloading program, and one piece of storing work program. After the download program runs, move the work program from another FLASH memory to the memory and run the work program. It can also be implemented with a piece of FLASH memory. When the MCU has more external chips, the interface resources will be tight. At this time, the advantage of FLASH is reflected. In the case of one FLASH, part of the sector of the FLASH stores the download program, and another part of the sector stores the work program. After the MCU is powered on, the download program is moved from the address of the FLASH storing the download program to the memory, and after running. According to the situation, it is decided that the work program needs to be upgraded or the work program is moved from the address of the FLASH storing the work program to the memory. When the work program is deleted, it can be easily upgraded to protect the security of the work program. The specific plan is as follows:

As shown in FIG. 1, a system for protecting an MCU working program, the system is used to implement a method for protecting an MCU working program, and the system includes:

The MCU is connected to the external storage module and the memory respectively for running the download program, the working program, and the moving of the BOOT code from the FLASH memory to the memory.

The external storage module, the embodiment adopts a FLASH memory, the FLASH memory includes a first storage sector for storing a download program, and the second storage sector for storing a working program, the first storage sector further storing a BOOT code for guiding the MCU to move and run a download program and/or a work program, the BOOT code being stored at a starting position of the first storage sector .

The memory is used to store the download program and/or the work program according to the command of the MCU, and is also a space for storing the program itself and running the program.

Preferably, the external storage module is a FLASH memory.

The specific implementation steps of the method of the present invention are described in detail below with reference to the embodiment shown in FIG.

1. The first 1K space of the FLASH memory (the starting position of the first storage sector) is used to store the BOOT code. The BOOT code is included in the download program. When the MCU is powered on, the MCU moves 1K from the first address of the FLASH memory. The BOOT code is in the 1K space starting at the 0 address of the memory, and then the BOOT code is run.

2. The function of the BOOT code is to move the program after the BOOT code from the FLASH memory to the corresponding address in the memory, and start the download program after the completion of the move.

3. After the download program runs, determine whether to run the work program or upgrade the work program.

4. If it is running the working program, then the downloading program starts to move the working program code from the working program storage location in the FLASH memory to the corresponding address in the memory, and after completing the moving, jumps to the entry function of the working program, and then the MCU runs all. Is the working procedure.

5. If an emergency occurs, the work program in FLASH is deleted. In step 3, it is judged that the working program needs to be upgraded, and the working program is sent by the host computer to the MCU, and the downloading program writes the working program to the corresponding position in the FLASH.

6. Then reset by the download program, re-run the download program, and then move the work program and run it by the download program.

The above is a detailed description of the preferred embodiments of the present invention, but the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the invention. Such equivalent modifications or alternatives are intended to be included within the scope of the claims.

Claims

A method for protecting an MCU working program, characterized in that it comprises the steps of:

S1, running the download program;

S2, it is determined by the downloading program whether the working program should be run or should be upgraded, if it is running the working program, then proceeds to step S3, if it is necessary to upgrade the working program, then proceeds to step S4;

S3, the downloading program moves the working program code from the external storage module to the corresponding address in the memory, and the MCU runs the working program after the moving is completed;

S4, the MCU receives the working program from the upper computer, and the download program writes the working program to the corresponding position in the external storage module, and then repeats steps S1 and S2.
A method of protecting an MCU operating program according to claim 1, wherein said downloading program and said working program are stored in different storage sectors of the same external storage module.
The method for protecting an MCU working program according to claim 2, wherein the external storage module is a FLASH memory.
The method for protecting an MCU working program according to any one of claims 1 to 3, wherein the method for protecting an MCU working program further comprises the steps of:

S01, first move the BOOT code from the external storage module to the memory, and then run the BOOT code;

S02: BOOT code execution action: moving the download program and/or the work program from the external storage module to the corresponding address in the memory, and executing step S1 after the transfer is completed.
A system for protecting an MCU working program, characterized in that the system is for implementing a method for protecting an MCU working program according to any one of claims 1 to 4, the system comprising:

The MCU is respectively connected to an external storage module and a memory for running a download program and a work program;

An external storage module, the external storage module including a first storage sector for storing a download program, and the second storage sector for storing a work program;

Memory for storing download programs and/or work programs according to the commands of the MCU.
A system for protecting an MCU work program according to claim 5, wherein said first storage sector stores a BOOT code for guiding the MCU to move and run the download program and/or the work program. .
A system for protecting an MCU working program according to claim 5 or 6, wherein the external storage module is a FLASH memory.