CN100382038C - A Method for Realizing Auxiliary Counting in the Process of Erasing and Writing Flash of Single-chip Microcomputer - Google Patents

Abstract

The invention relates to a method for realizing auxiliary counting in the process of erasing and writing Flash of a single-chip microcomputer, which is used for performing auxiliary counting when clock interruption is shielded in the process of erasing and writing Flash, so as to improve the accuracy of clock counting, and is characterized in that, comprising : Step 1, determining the fixed time consumption and the random time consumption of program operation after the clock interrupt is turned off; and Step 2, implementing auxiliary counting compensation in the program code for the fixed time consumption and random time consumption. The method for realizing auxiliary counting in the process of erasing and writing Flash of the single-chip microcomputer of the present invention can improve the accuracy of clock counting to the greatest extent through auxiliary counting, ensure the realization of functions that need to be counted and judged, and enhance the accuracy of clock counting when the interrupt is turned off and reliability.

Description

A Method for Realizing Auxiliary Counting in the Process of Erasing and Writing Flash of Single-chip Microcomputer

technical field

The invention relates to the application field of single-chip microcomputers, in particular to an auxiliary counting method in the process of chip erasing and writing Flash.

Background technique

In large-scale system applications, due to the complex functions and frequent changes, the version download update has become a must-have function. Complete the entire function. In the implementation of these functions, counting in the clock interrupt is common and one of the essential methods. For example, it is a basic requirement to indicate the current processing status by flashing lights. In practical applications, many systems use For the development of single-chip microcomputer, since the software is packaged into the single-chip microcomputer chip, at the same time, there may be no or no external equipment to observe the running status of the software. The way of flashing lights can indicate the start of downloading, the process of downloading, etc. In fact, this is also a common and necessary external observation method, and the frequency of lighting is counted by the number of clock interruptions.

Many single-chip microcomputers are now divided into two areas, one area is the Boot area, and the other area is the version area. Usually the Boot program has two purposes - the boot version starts and erases the Flash, and updates the software version. During the processing of the updated version, the requirements of each chip are different, which will also affect the processing of clock interrupts to a certain extent. Specifically, some chips require shielding interrupts when operating Flash, and the frequency of counting is often based on The calculation is carried out in the clock interrupt. After the interrupt is shielded, the accurate clock will be lost, and the normal counting will not be possible, so that the functions that need to rely on the counting will lose the accuracy of the operating status judgment, and may cause them to lose their originality. Some effect.

The purpose of the auxiliary counting method involved in this article is to ensure the basic reliability and indicator of counting in the process of single-board flash erasing and writing, so that users can compensate for the errors in the erasing process according to the auxiliary method. In order to maximize the accuracy of clock counting and ensure the normal function of the system. To put it simply, general applications of this type only use clock interrupts for counting, and at the same time perform corresponding processing through the counting results. Once the interrupts are turned off, the counting basis will be lost, resulting in deviations in the corresponding functional processing. In this paper, the auxiliary counting is used to calculate the time of closing the interrupt, and compensate the time consumed when there is no interrupt, so as to assist the accurate timing of the clock interrupt and ensure the basic accuracy of the time required for the function to be realized.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for counting in the process of erasing and writing the Flash with a single-chip microcomputer, so as to overcome the inaccurate shortcoming of clock counting caused by the inaccurate clock counting caused by the inability to open the clock interrupt in the process of erasing and writing the Flash of some single-chip microcomputers in the prior art.

In order to achieve the above object, the present invention provides a method for realizing auxiliary counting in the process of erasing and writing Flash of a single-chip microcomputer, for performing auxiliary counting when the clock interrupt is shielded in the process of erasing and writing Flash, to improve the accuracy of clock counting , including:

Step 1, determine the fixed time consumption and the random time consumption time of the program running after the clock interrupt is turned off; and

Step 2, implement auxiliary counting compensation in the program code for the fixed time consumption and the random time consumption.

Described method, wherein, described step one further comprises:

Step one by one, analyze the program code to determine the trigger point of opening and closing the interrupt when operating the Flash;

Step one and two, analyze the program code, determine the fixed code execution part and the random execution part in the process of closing the interrupt and opening the interrupt;

Step 13: Analyze and calculate the execution time T1 of the fixed code part and the time range T2-T3 consumed by the random execution part.

Said method, wherein, in said step 13, use oscilloscope measurement or clock crystal oscillator to calculate the execution time T1 of said fixed code part.

Said method, wherein, in said step 2, said step of implementing auxiliary counting compensation for fixed time consumption further includes:

Step 21, when the clock interrupt is turned off before operating the Flash, back up the current clock counting result;

Step 22: Restore the counting result of the clock before turning on the clock interrupt after operating the Flash, and compensate the saved count according to the time T1 obtained by the auxiliary counting fixed loss;

Step two and three, open a set interrupt for exiting the Flash operation, and count and judge in the interrupt, process the function that needs to be triggered beyond the count value, and update the corresponding count value at the same time to ensure the accuracy of the count timeliness and accuracy.

Said method, wherein, in said step 2, said step of implementing auxiliary counting compensation for random time consumption further includes:

Step 32: Restore the counting result of the clock and take (T2+T3)/2 as the compensation value before turning on the clock interrupt after operating the Flash to compensate for the random time consumption delayed after the clock interrupt is turned off.

Said method, wherein, in said step 2, said clock count compensation value for realizing auxiliary count compensation fixed time consumption and random time consumption includes fixed time consumption T1 and random time consumption (T2+T3)/2.

Described method, wherein, the interruption that is used to withdraw from described Flash operation in described step two or three is a timer interruption, and the step of opening described timer interruption further includes setting described timer interruption according to hardware needs The trigger count value of the step.

Described method, wherein, further comprises the step of entering described timer interrupt service program after the Flash operation is finished, and judges whether described compensation time is greater than the counter value that the function trigger of setting; If so, then trigger corresponding function; If not, the clock count value is compensated, and the disabled clock interrupt is enabled after the compensation.

Said method, wherein, after said step of implementing auxiliary counting to compensate time consumption, further includes a step of entering normal counting.

The method for realizing auxiliary counting in the process of erasing and writing Flash of the single-chip microcomputer of the present invention can improve the accuracy of clock counting to the greatest extent through auxiliary counting, ensure the realization of functions that need to be counted and judged, and enhance the accuracy of clock counting when the interrupt is turned off and reliability.

This method of auxiliary counting to compensate clock interrupt delay uses fixed compensation and random compensation to make up for the inaccurate clock counting problem caused by the clock interrupt being masked in the process of erasing and writing Flash, which improves the accuracy of clock counting and allows us to It is more convenient and effective to use clock counting to realize timing-required functions such as flashing lights. At the same time, due to the existence of random compensation, this method can only basically meet the time requirements and cannot achieve completely accurate auxiliary counting. However, in practical applications, it can basically meet the real-time requirements.

The method of the present invention can be used in the situation that when the used chip normally erases and writes the Flash in the application process, the clock interruption will be affected, but basically normal counting is required to complete a certain function.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

Fig. 1 is a kind of method figure that realizes single-chip microcomputer Flash dynamic update of the inventive method;

FIG. 2 is an implementation diagram of a method for realizing dynamic updating of a single-chip microcomputer Flash according to the method of the present invention.

Detailed ways

Method of the present invention is realized according to the following scheme:

Equipment: MCU and its host board

Test Instruments: Instruments such as oscilloscopes to measure execution time or none.

Auxiliary counting methods need to include the following two factors:

1. After the clock interrupt is turned off, the program runs for a fixed time consumption

2. After the clock interrupt is turned off, the random time consumption of the program running

It can be seen from the above that the method of auxiliary counting needs to process the time consumption of fixed and random events separately, as follows: (fixed time: refers to the fixed code execution time T1; auxiliary time: refers to the approximate time from the issuance of the hardware operation instruction to the completion and The random execution time of the code is represented by T2~T3)

1. Determine the time of fixed time consumption and auxiliary time consumption

i. Analyze the program code to determine the trigger point of turning on and off the clock interrupt when operating the Flash.

ii. Analyze the program code to determine the fixed code execution part and the random execution part in the process of closing the clock interrupt and opening the clock interrupt.

iii. To calculate the execution time of the fixed code part, an oscilloscope can be used to measure or a clock crystal oscillator can be used to calculate the time T1 of processing instructions.

iv. Analyze and calculate the time range T2-T3 consumed by random events, where the time range is generally determined according to the current running environment of the code and the branching situation of the code itself.

2. Auxiliary counting compensation for fixed loss is realized in the program code

i. When the clock interrupt is turned off before operating the Flash, the current clock counting result is backed up

ii. After operating the Flash and before turning on the clock interrupt, restore the clock counting result, and compensate the saved count according to the time T1 obtained by the auxiliary counting fixed loss

iii. Open an interrupt, wherein, the interrupt is set for exiting the Flash operation, and counting is judged in the interrupt, the function that needs to be triggered beyond the count value is processed, and the corresponding count value is updated simultaneously to ensure the timely counting and accuracy, wherein, the interrupt can be any interrupt of the single chip microcomputer, such as a timer interrupt, which can be determined according to the user's own settings.

3. Auxiliary counting compensation for random loss is implemented in the program code

i. There is no general method for the random loss T2~T3. Here we use the average method and take (T2+T3)/2 as the compensation value to compensate for the possible delay after the clock interrupt is turned off.

ii. The specific compensation method is the same as the compensation method for fixed loss.

The flow of the implementation method will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1, it is a diagram of the method for realizing the auxiliary counting method of the single-chip Flash erasing. It mainly includes 5 parts. First, the fixed consumption time T1 and the random (ie auxiliary) time consumption should be determined according to the specific MCU hardware parameters and software program codes (we only have a certain range T2~T3 for this time, and the specific average value is taken ) (step 101); close interrupt, (step 102), the clock count value (step 103) of the timer X that record processing function triggers mark processing; Carry out Flash read and write or erase operation (step 104); Open for exiting The interrupt of the timer Y of Flash operation (reading and writing or erasing), and set interrupt trigger count value (step 105) according to hardware needs; In the interrupt service program of timer Y, to the compensation value T1+( T2+T3)/2 to judge, if it exceeds the count value, it will trigger the corresponding function to process (multiple functions can be used), otherwise, the count value will be compensated, and the interrupt of X will be turned on, and the interrupt of Y will be turned off (step 106); finally enter In the normal counting process, the function processing flag is judged in the interrupt service routine of timer X (step 107).

As shown in FIG. 2 , it is a flow chart of a method for realizing the erasing auxiliary counting of a single-chip microcomputer Flash in the method of the present invention. Next, in the mobile communication system, take the application of Winbond's W78LE516P single-chip microcomputer in the single board as an example to describe in detail how to realize the auxiliary count when performing Flash erasing.

Here we will use the two timers of the single chip microcomputer, which are 0 and 1 respectively. Timer 1 is used to run the counting function of the lamp, and timer 0 is used to trigger an interrupt when the flash is erased and written from the flash state. .

Set the timing precision of timer 1 according to the time of compensation, guarantee that the timing precision is greater than the compensation time, (step 201);

Close the timer 1 interrupt before entering the Flash erasing operation state, record the current count value of the current timer 1 (step 202);

Start timer 0 to interrupt, and set the interrupt trigger time (i.e. the count value of timer 0) (step 203) according to this Flash operation of single-chip microcomputer hardware this time;

Flash operation completes, enters timer 0 interrupt service program (step 204);

Carry out the judgment of compensation time, judge whether the compensation time is greater than the count value (step 205) that certain function triggers; If so, then trigger corresponding function and clear the count value (step 206) of this timer 1, then proceed to step 208; No, then the count value of timer 1 is compensated, restarting timer 1 is interrupted (step 207);

Enter normal counting, if continue to have Flash operation then return to step 202 and continue to execute (step 208).

The method for realizing auxiliary counting in the flash erasing process of the present invention can ensure the basic reliability and indication of counting in the erasing and writing process of the Flash, can maximize the accuracy of clock counting, and ensure the normal function of the system.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (7)

1. a method that realizes auxiliary counting in the Flash erase/write process of chip microcomputer is used for the process at Flash erase/write, carries out auxiliary counting when clock interrupts conductively-closed, to improve the accuracy of clock count, it is characterized in that, comprising:

Step 1, the set time of determining program run after the clock impeding shutdown consumes time range T2～T3 that T1 and random time consume; And

Step 2 realizes that in program code auxiliary counting compensates described set time consumption and random time consumption;

The step that the described realization auxiliary counting compensation set time consumes further comprises:

Step 2 one, when closing the clock interruption before the operation Flash, backup present clock count results;

Before step 2 two, operation are opened clock behind the Flash and are interrupted, reduction clock count result, the counting of preserving according to time T 1 compensation of auxiliary counting fixed loss gained;

Step 2 three is opened one and is used to withdraw from the interruption of described Flash operation, and count judgement in described interruption, and the function that need trigger above count value is handled, and upgrades corresponding count value simultaneously;

The step of described realization auxiliary counting compensation random time consumption further comprises:

Before opening the clock interruption behind the operation Flash, reduction clock count result gets (T2+T3)/2 value by way of compensation, and the random time consumption of having no progeny in the clock and incuring loss through delay is closed in compensation.

2. method according to claim 1 is characterized in that, described step 1 further comprises:

Step one by one, the routine analyzer code is opened described clock and is interrupted and close the trigger point that described clock interrupts when determining operation Flash;

Step 1 two, the routine analyzer code is determined to close described clock interruption and is opened code operating part fixing in the described clock interrupt procedure and operating part at random;

Step 1 three, the time T 1 that analysis and calculating fixed code are partly carried out reaches the time range T2～T3 of operating part consumption at random.

3. method according to claim 2 is characterized in that, in described step 1 three, utilizes oscilloscope measurement or clock crystal oscillator to calculate the time T 1 that described fixed code is partly carried out.

4. method according to claim 1 and 2, it is characterized in that, in described step 2, the described realization auxiliary counting compensation set time consumes and the clock count offset of random time consumption comprises set time loss T1 and random time consumption (T2+T3)/2.

5. method according to claim 1, it is characterized in that, the interruption that is used to withdraw from described Flash operation in the described step 2 three is that a timer interrupts, and opens and further comprise the step of setting the flip-flop number value that described timer interrupts according to the hardware needs in the step that described timer interrupts.

6. method according to claim 5 is characterized in that, further comprises after Flash operation is finished entering described timer interrupt service routine, and judges the step of the count value whether described make-up time triggers greater than the function of setting; In this way, then trigger corresponding function; As not, then described clock count value is compensated, and after compensation, open described clock interruption of closing.

7. according to claim 1,2 or 5 described methods, it is characterized in that, after the step of described realization auxiliary counting make-up time consumption, comprise that further one enters the step of normal counting.

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