CN104375863A

CN104375863A - Program online upgrading method in embedded system

Info

Publication number: CN104375863A
Application number: CN201410648243.6A
Authority: CN
Inventors: 张毓; 弭强
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-11-17
Filing date: 2014-11-17
Publication date: 2015-02-25

Abstract

The invention discloses a program online upgrading method in an embedded system. The program online upgrading requirement always exists in the embedded system. If upgrading is failed due to accidents in the upgrading process, serious consequences may be caused. For example, if a program in a power line communication module of a smart power grid is crashed, serious faults of an electric power system will be caused. By means of the program online upgrading method, equal standby operation and ping-pong operation are adopted for key components of the program, crashing, caused by failed upgrading, of the program can be avoided, the upgrading time is shortened, and therefore influences on the system are reduced.

Description

A kind of method of online upgrading program in embedded system

Technical field

The present invention relates to embedded system and field of power line communication, especially the on-line software updating of suitable power line communication module.

Background technology

In various embedded system, usually use one piece of nonvolatile memory (commonly flash) as the storage space of program (or title software).Due to edition upgrading (revision mistake, increase function etc.), this part program wants online upgrading unavoidably.Program generally can be divided into two parts: application function district (being called for short APP district herein), system start and upgrade functional areas (being called for short ROOT) district.

Inevitably run into accident in escalation process and interrupt, such as power down, communication disruption etc.This situation is dealt with improperly and systemic-function disappearance can be caused even to collapse, and consequence is serious.Such as, power line communication module can be used in the monitor network of intelligent grid, once cause afunction because upgrading failure, can cause electric power system fault and even paralysis.

For the upgrading of APP, if break in midway, can redo and not have too large impact; To the upgrading of ROOT, when needing to ensure to break in midway, system still can be run.So the robustness of the upgrading of ROOT will be ensured, reduce the erasable time to ROOT as far as possible simultaneously.Why to reduce the erasable of ROOT, be because system can not have response to external world during this period of time, be likely to miss the event that some are important.This is risky to operating system, such as intelligent grid.

Common a kind of way is, adopt a Ge Zhu ROOT district and a backup ROOT district, each upgrading is wanted successively all to carry out single job to the two.Method object herein, the while of ensureing robustness, reduces the operation of ROOT further.

Summary of the invention

In order to reduce the impact on system in ROOT escalation process as far as possible, a kind of method is proposed: adopt the ROOT district that two pieces reciprocity, ping-pong operation and use herein.

Concrete grammar is:

The program space is divided into an APP district, Liang Ge ROOT district.The upgrading of APP adopts common methods.The upgrading of ROOT uses and adopts ping-pong.Please refer to Fig. 1, step is: (1) originally program uses first ROOT (being called for short ROOT0 herein), and another (being called for short ROOT1) is idle; (2) during first time upgrading ROOT, ROOT0 is constant, upgrades ROOT1 until success; (3) system uses ROOT1 and APP to run; (4) during second time upgrading ROOT, ROOT1 is constant, upgrades ROOT0 until success; (5) system uses ROOT0 and APP to run; (6) if after this upgrade ROOT again, roughly the same (2) ~ (5) step, so repeatedly.

Simplify because ROOT district generally compares, and the general volume ratio of nonvolatile memory (such as NOR flash) is comparatively large now, so the space hold that multiplex one piece of ROOT district causes is smaller.And the beneficial effect that it brings is: (1) ensures to have at least one piece of ROOT to be available all the time, ensure that the robustness of system.(2) each upgrading ROOT only need carry out erasable to a ROOT, at utmost shortens the time that system external does not respond; And common way is one, primary area backup area, each upgrading all will be carried out erasable to the two, and the time is longer by contrast, and operate more complicated, the probability of makeing mistakes is larger.

Here the code comprising system and start and upgrade made a general reference in general embedded system in abbreviation " ROOT district ", from starting here during system electrification.

Accompanying drawing explanation

Program space State Transferring when Fig. 1 is each upgrading ROOT;

Fig. 2 is the relay processes of case Program function call when normally running;

Fig. 3 is operating process when upgrading ROOT in case.

Embodiment

Early-stage preparations: owing to being select a use in two ROOT, so need to ensure can correctly hit ROOT used at present when function call.Here function call is divided three classes---within APP, within ROOT, between APP and ROOT.First two does not need extra consideration, and the third can use relay function between call-and-return, makes the ROOT that the jump address of program can correctly be hit.As the procedure division of Fig. 2, after system electrification, first group of jump instruction can select that address effective from two base address of ROOT, jumps to this ROOT according to this address.Two base address root0_base and root1_base just deposit in the latter half of jump instruction, and immediately thereafter be the relay function call_relay () called and the relay function ret_relay () returned.When working procedure calls between APP and certain ROOT, the calculating of jump address can be carried out through these two functions, obtain correct jump address by according to rootX_base thus hit ROOT used in calculating.What in figure, arrow line represented is calls from APP the process that ROOT returns again; From ROOT call APP process can the rest may be inferred.

The flow process upgrading certain ROOT please refer to Fig. 3.ROOT1 is upgraded to run ROOT0.Can run in normal operation and upgrade demand, so start the renewal to ROOT1.Restart as accident, although then ROOT1 upgrades unsuccessful but still can run from ROOT0; Later long-range meeting continues to require online updating until complete.After ROOT1 refreshes, can arrange the mark successfully upgraded in the root1_base in redirect district that powers on, it is invalid then the mark of root0_base to be set to.Because this one-phase last first puts root1_base to put root0_base effectively more invalid, even if so meet accident power-off during this, the two at least has one is effective, thus still can normally run after ensureing to restart.

Above embodiment and case study on implementation are only be described invention, but the present invention is not limited thereto.For those skilled in the art, also protection scope of the present invention is considered as not departing from the various improvement outside inventive concept scope.

Claims

1. a kind of method of online upgrading program in embedded system, is characterized in that, be divided into two class regions in the program space---APP district and ROOT district.The former adopts conventional update mode to upgrade; The latter adopts two pieces of reciprocity ROOT districts, needs only to upgrade one of them when upgrading ROOT district at every turn, and another is constant, if be updated successfully, uses new ROOT district, otherwise uses original ROOT district, again upgrade after treating.

2. the method for online upgrading program according to claim 1, is characterized in that: Liang Kuai ROOT district is reciprocity, regardless of principal and subordinate.

3. the method for online upgrading program according to claim 1, is characterized in that: Liang Kuai ROOT district is not when upgrading, and the program in a piece is in operation, and the program of another block is not run (free time); When upgrading, idle that will be upgraded.

4. the method for online upgrading program according to claim 1, it is characterized in that: every block ROOT is arranged and upgrades successfully mark, time program brings into operation (power on or restart), can determine which ROOT is up-to-date and effective thus, and jump to this ROOT district and continue to run.