CN112631526A - Method for reading and writing same memory by main cycle and interrupt cycle of embedded system - Google Patents

Abstract

The invention discloses a method for reading and writing the same memory by a main cycle and an interrupt cycle of an embedded system, and relates to the technical field of electronic electric energy meters. The waveform recording module composed of an embedded system receives waveform data of the electric energy meter and stores the waveform data in the storage device, and only the interruption write-in memory can be adopted to ensure that the data sent by the electric energy meter can be received, so that the main cycle and the interruption cycle read-write memory conflict can be caused, and the read-write function is invalid. The method comprises the following steps: a CS signal of the SPI bus triggers an interrupt receiving program, and waveform data are written into a memory in the interrupt receiving process; after the writing is finished, a timer is triggered to run, and when the 20ms period is finished, the timer is reset; in the main cycle, the timer is detected to count time, and if the time from the running of the timer to the reset is longer than the time of the reading and processing of the memory, the reading processing operation is carried out. The conflict problem of reading and writing of the same memory by the main cycle and the interrupt cycle can be effectively avoided, and the failure of the reading and writing function is prevented.

Description

Method for reading and writing same memory by main cycle and interrupt cycle of embedded system

Technical Field

The invention relates to the technical field of electronic electric energy meters, in particular to a method for reading and writing the same memory by a main cycle and an interrupt cycle of an embedded system.

Background

At present, with the development of a power grid demand side management technology, the local calculation function of the traditional electric energy meter cannot meet the requirements of load identification, impact load analysis and the like. To meet these requirements, recording the power grid waveform for processing by a device with greater computing power is one of the approaches. The carrier for realizing the recording of the power grid waveform is a waveform recording module consisting of an embedded system, receives waveform data from an electric energy meter and stores the waveform data in a storage device, and only can write the data into a storage device in an interrupt mode in order to ensure that the data of about 2.4k at 128 points every 20ms sent by the electric energy meter can be received. The memory data is read in the main loop of the program. This mechanism may cause memory data to be written into an interrupt while the memory data is being read, which may cause hardware resource conflicts and failure of the read and write functions.

Disclosure of Invention

The technical problem to be solved and the technical task provided by the invention are to perfect and improve the prior technical scheme, and provide a method for reading and writing the same memory by the main cycle and the interrupt cycle of the embedded system, so as to solve the conflict problem when the main cycle and the interrupt of the embedded system read and write the same memory. Therefore, the invention adopts the following technical scheme.

The method for the read-write operation of the main cycle and the interrupt cycle of the embedded system on the same memory comprises the following steps:

1) in the interruption cycle, when the electric energy meter sends waveform data to the module at intervals of 20ms, a CS signal of an SPI bus of the electric energy meter triggers and receives an interruption program;

2) writing waveform data into a memory in the process of receiving interruption, triggering a timer after the writing is finished, and resetting the timer when the 20ms period is finished;

3) setting a timer, and turning to the step 1);

4) in the main cycle, the timing time of the timer is detected;

5) if the time from the running of the timer to the resetting is longer than the time of reading and processing by the memory;

6) and 4) performing a memory reading operation, and turning to the step 4).

The main cycle can conveniently identify the read-write state of the memory in the interrupt cycle by reading and judging the time of the timer, and the main cycle executes read-write operation under the condition that the interrupt cycle does not read and write the occupied memory, thereby avoiding the conflict problem of the main cycle and the interrupt cycle on reading and writing the same memory.

Has the advantages that: the conflict problem of reading and writing of the same memory by the main cycle and the interrupt cycle can be effectively avoided, and the failure of the reading and writing function is prevented.

Drawings

FIG. 1 is a schematic flow diagram of the present invention.

Fig. 2 is a functional block diagram of the present invention.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the drawings in the specification.

As shown in fig. 1, the method for performing read/write operations on the same memory by using the main cycle and the interrupt cycle of the embedded system includes the following steps:

1) in the interruption cycle, when the electric energy meter sends waveform data to the module at intervals of 20ms, a CS signal of an SPI bus of the electric energy meter triggers and receives an interruption program;

2) writing waveform data into a memory in the process of receiving interruption, triggering a timer after the writing is finished, and resetting the timer when the 20ms period is finished;

3) setting a timer, and turning to the step 1);

4) in the main cycle, the timing time of the timer is detected;

5) if the time from the running of the timer to the resetting is longer than the time of reading and processing by the memory;

6) and 4) performing a memory reading operation, and turning to the step 4).

As shown in fig. 2, the electric energy meter collects the voltage and current of the power grid and transmits the voltage and current to the wave recording module for processing through the SPI interface.

The main cycle can conveniently identify the read-write state of the memory in the interrupt cycle by reading and judging the time of the timer, and the main cycle executes read-write operation under the condition that the interrupt cycle does not read and write the occupied memory, thereby avoiding the conflict problem of the main cycle and the interrupt cycle on reading and writing the same memory.

The method for performing read/write operations on the same memory by using the main loop and the interrupt loop of the embedded system shown in fig. 1-2 is a specific embodiment of the present invention, and already embodies the outstanding substantive features and significant advances of the present invention, and the method can be modified equivalently in shape, structure and the like according to the practical use requirements and under the teaching of the present invention, and is within the scope of protection of the present solution.

Claims (1)

1. The method for the read-write operation of the main cycle and the interrupt cycle of the embedded system on the same memory is characterized by comprising the following steps:

1) in the interruption cycle, when the electric energy meter sends waveform data to the module at intervals of 20ms, a CS signal of an SPI bus of the electric energy meter triggers and receives an interruption program;

2) writing waveform data into a memory in the process of receiving interruption, triggering a timer after the writing is finished, and resetting the timer when the 20ms period is finished;

3) setting a timer, and turning to the step 1);

4) in the main cycle, the timing time of the timer is detected;

5) if the time from the running of the timer to the resetting is longer than the time of reading and processing by the memory;

6) and 4) performing a memory reading operation, and turning to the step 4).

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