KR100222620B1 - Multiprogram download method - Google Patents

Abstract

The disclosed download method is capable of downloading multiple programs and preventing multiple programs to be downloaded from colliding with each other in an internal region of the memory when a plurality of programs are run in a processor having an independent processing function.

Initial operation program is installed in the ROM, system area, expansion area, system RAM area and work area are installed in RAM, and when a new operation program is downloaded from the main processor, the currently running operating program resides in the ROM. It is determined whether a program or an operating program downloaded to the RAM extension area, and when the initial operating program is executed, backs up the data of the system area to the backup area, and stores a new operating program downloaded to the RAM extension area Jumps to the entry point of the RAM extension area and executes a new operation program from the entry point that has been jumped. When the determination result is that the operating program downloaded to the RAM extension area is executed, the program of the backup area is moved to the system area. Entry point of the initial operating program area of the ROM Jumps to the initial operating program, jumps to the entry point of the initial operating program area of the ROM, and stores another new operating program downloaded when executing the initial operating program in the RAM extension area and enters the RAM extension area. Jump to the point and run the new operating program from the entry point you jumped to.

Description

How to download multiple programs

The present invention relates to a method of downloading a multi-program, and in particular, a multi-program using a read only memory (ROM) and a random access memory (RAM) is used. The present invention relates to a multi-program download method in which multiple programs to be downloaded do not collide in an internal area of a memory when a plurality of programs can be easily downloaded and run in a single processor having independent processing functions.

In order to develop a program of a processor having an independent processing structure, it is necessary to continuously update a changed program. There are two ways to update a program as follows.

First, there is a method of replacing a ROM in hardware, using a ROM recorder, to record a changed program in a ROM, and to replace a ROM that records the changed program with a ROM in which an existing program is recorded.

Secondly, there is a method of setting a program area in RAM by using RAM as a hardware, downloading a changed program from another processor, and storing the program area in the set program area.

In this case, the method using an emulator, which is a special development equipment, is excluded.

The first of the above methods is to update the program using the ROM. The structure of the hardware is simple, and there is no need for a separate download program for downloading and updating the changed program, but the ROM is recorded every time the program is updated. Using the device, the changed program is recorded in the ROM, and when the recording of the changed program is completed, the cumbersome task of replacing the ROM in which the changed program is recorded with the ROM in which the existing program is recorded must be repeated.

And the second way to download the program using RAM is to make the structure that the program area of RAM can be accessed from the host, that is, other processors. The structure of the hardware is complicated. There was a problem that it is difficult to configure an independent system.

Accordingly, an object of the present invention is to provide a multi-program download method that can easily download a multi-program using a ROM, which is a read-only memory, and a random access memory.

Another object of the present invention is to provide a method of downloading a multi-program such that the downloaded multi-programs do not collide in a memory area when a plurality of programs are driven in one processor having independent processing functions.

According to the downloading method of the multi-program of the present invention for achieving the above object, the first step of providing an initial operating program in the ROM; A second step of providing a system area, an extended area, a system RAM area, and a backup area in RAM when the initial operation program is completed in the ROM in the first step; When the RAM is prepared in the second step and a new operating program is downloaded from the main processor, whether the currently running operating program is an initial operating program resident in the ROM or an operating program downloaded to the RAM extension area. Determining a third step; A fourth step of backing up data of a system area to the backup area when the determination result of the third step is execution of an initial operating program; A fifth step of storing a new operating program downloaded to the extended area of the RAM when data backup is completed in the fourth step; A sixth step of jumping to the entry point of the extended area of the RAM and executing the new operation program from the jumped entry point when storing of the new operation program is completed in the fifth step; In the case of the execution of the operating program downloaded to the RAM extension area as a result of the third step, the program of the backup area is moved to the system area and the initial operation program is jumped to the entry point of the initial transport program area of the ROM. Performing a seventh step; When performing the initial operating program by jumping to the entry point of the initial operating program area of the ROM in the seventh step, another new operating program downloaded in the fifth step is stored in the RAM extension area and the sixth step of the sixth step is performed. And an eighth step of jumping to the entry point of the RAM extension area and executing a new operating program from the jumped entry point.

And the new operating program; It is characterized in that downloaded to the expansion area of the RAM through the communication memory provided between the main processor and the subordinate processor.

1 is a block diagram showing the configuration of a download system to which the download method of the present invention is applied;

2 is a view for explaining the map structure of the memory according to the download method of the present invention,

3 is a signal flowchart for explaining the download method of the present invention.

* Explanation of symbols for main parts of the drawings

1: Download Program 10: Main Processor

20: Romans 40: Ram

42: system area 44: extended area

46: system RAM area 48: backup area

60: dependent processor 80: communication memory

Hereinafter, a multi-program download method of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a multi-program download system according to the present invention.

Here, reference numeral 1 denotes a download program, and reference numeral 10 denotes a main processor 10 for operating the download program 1.

The load 20 is a ROM in which the initial operating program is stored in advance and only the access of the pre-stored initial operating program is executed, and the reference numeral 40 denotes a function of recording and reading a program downloaded and sequentially downloaded new operating programs from the main processor 10. RAM having a predetermined capacity.

The RAM 40 includes a system area 42 for storing a program currently being executed and an expansion area 44 for downloading a new operating program, as shown in FIGS. 2A to 2C. And a system RAM area 46 for executing the original ROM program, and a predetermined area of the RAM 40 so that data stored in the system area 42 can be backed up upon returning to the initial operating program. It has an assigned backup area 48.

Reference numeral 60 denotes a subordinate processor that downloads a new operating program transmitted from the main processor 10 to the RAM 40 and selectively processes the operating program resident in the ROM 20 or the RAM 40.

Reference numeral 80 is provided between the main processor 10 and the slave processor 60 to store and store a new operating program delivered from the main processor 10 to provide the slave processor 60 with the stored operating program. Communication memory 80.

The download method of the present invention applied to the download system having such a configuration includes a map structure of the ROM 20 and the RAM 40 which are the map structures of the memory shown in FIGS. 2 (a) to 2 (c), and This will be described in detail with reference to the signal flow diagram of FIG. 3.

In FIG. 1, when the dependent processor 60 requests the download of the program, the main processor 10 performs the download program 1 in response to the download request of the program and stores a new operating program in the communication memory 80. The operating program stored in the communication memory 80 is transmitted to the subordinate processor 60 according to the request of the subordinate processor 60.

Then, the subordinate processor 60 inputs a predetermined operating program that is transmitted, that is, a predetermined operating program to be downloaded and stores it in the extended area 44 of the RAM 40.

That is, the slave processor 60, as shown in FIG. 3, prepares an initial operating program in the ROM 20 in step S10, and as shown in FIG. 2 (a) in step S12. The system area 42, the expansion area 44, the system RAM area 46, and the backup area 48 are provided in the RAM 40.

In addition, before the operating program to be downloaded is stored in the extended area 44 of the RAM 40, the dependent processor 60 may perform an initial operation in which the operating program currently running in the ROM 20 resides in the next step S14. It is determined whether the operating program or a predetermined operating program stored in the extended area 44 of the RAM 40 is downloaded.

As a result of the determination in step S14, when the program executed by the subordinate processor 60 is the initial operating program residing in the ROM 20, the arrow A is shown in FIG. 2 (b) in step S16. The program stored in the system area 42 of the RAM 40 is backed up to the backup area 102.

Here, the system area 42 is used to store a program of the ROM 20 currently being executed, such as an interrupt vector required for the operation of the slave processor 60.

First, when a new operating program is downloaded and stored in the extended area 44 of the RAM 40, since the current operating program is in a running state, a collision occurs with the downloaded program and the system stops.

Therefore, in order to prevent this, when executing the download more than once, the execution status is moved to the first ROM program area.

However, before the execution state is transferred, since the newly loaded program in the current system area is overwritten by the previous program, normal operation is impossible. Therefore, the backup area 42 of the RAM 40 includes the system area 42. Take a backup of the program and restore it if necessary.

In a next step S18, a new operating program downloaded to the extended area 44 of the RAM 40 is stored, and when the storage of the new operating program is completed, the arrow B is shown in FIG. 2 (b) in step S20. ) Jumps to the entry point of the extended area 44 of the RAM 40 and executes a new operating program from the entry point of the jumped extended area 44. At this time, the existing system area 42 is stored as the contents of the new operating program.

In this state, if the second or more downloads are executed, they are reloaded into the existing new program. Since the current operating program is in the running state, the system crashes due to the downloaded operation.

Therefore, when the second or more downloads are executed, the program currently being operated by the subordinate processor 60 is located in the extended area 44 of the RAM 40, and thus the operation must be switched to the operating program of the ROM 20.

Therefore, when it is determined in step S14 that the program executed by the slave processor 60 is not the initial operating program residing in the ROM 20, that is, the slave processor 60 extends the extended area 106 of the RAM 40. In the case where the operating program downloaded in step 2) is executed, the program in the backup area 102 is moved back to the system area 42 as shown by the arrow C shown in FIG. 2C in step S22. In operation S24, an initial operation program is performed by jumping to the entry point of the initial operation program area of the ROM 20 as shown by an arrow D. FIG.

In the next step S18, a new operating program downloaded to the expansion area 44 of the RAM 40 is stored as described above, and in step S20, the jump to the entry point of the expansion area 44 of the RAM 40 is performed. Then, a new operating program is executed from the entry point of the jumped extended area 44.

Since the two operating programs are stored in the ROM 20 and the RAM 40 after the download operation is completed, the slave processor 60 can selectively use the two operating programs.

As described above, in the case of downloading a plurality of new operating programs, the download method of the present invention allocates a backup area for temporarily storing a program in the system area so that the downloaded operating program and the program in the system area do not conflict with each other. In addition, in the case of the second or more download, the upgraded operating program can be easily downloaded from the host's main processor by switching the operation to the ROM's operating program, which makes it easy to update the operating program on the dependent processor.

In addition, there is no need to replace the existing ROM with the updated ROM every time the operating program is updated, thereby reducing the cost.

The download method according to the present invention can shorten the development period when developing the ROM memory, and it is preferable to make the execution state immediately without downloading in the final step by applying the original operating program that has been developed in this way.

Claims (2)

A first step of preparing an initial operating program in the ROM; A second step of providing a system area, an extended area, a system RAM area, and a backup area in RAM when the initial operation program is completed in the ROM in the first step; When the RAM is prepared in the second step and a new operating program is downloaded from the main processor, whether the currently running operating program is an initial operating program resident in the ROM or an operating program downloaded to the RAM extension area. Determining a third step; A fourth step of backing up data of a system area to the backup area when the determination result of the third step is execution of an initial operating program; A fifth step of storing a new operating program downloaded to the extended area of the RAM when data backup is completed in the fourth step; A sixth step of jumping to the entry point of the extended area of the RAM and executing the new operation program from the jumped entry point when storing of the new operation program is completed in the fifth step; In the case where the third step determines that the operating program downloaded to the RAM expansion area is executed, the program in the backup area is moved to the system area and the initial operation program is jumped to the entry point of the initial operating program area of the ROM. Performing a seventh step; When performing the initial operation program by jumping to the entry point of the initial operation program area of the ROM in the seventh step, another new operating program downloaded in the fifth step is stored in the RAM expansion area and the RAM of the sixth step Jumping to the entry point of the extended area of the multi-program download method comprising the step of executing a new operating program from the jumping entry point. The system of claim 1, wherein the new operating program; The multi-program download method, characterized in that being downloaded to the extended area of the RAM through the communication memory provided between the main processor and the subordinate processor.