Shared memory based data access method and device

Abstract

The invention relates to the field of data processing, in particular to a shared memory based data access method and device. The method comprises steps as follows: a first processor applies a first data buffer area in a preset shared memory area; the first processor preserves data required to be sent in the first data buffer area and sends an interrupt instruction to a second processor; after the second processor receives the interrupt instruction, whether data required to be read exist in the first data buffer area is judged; and the data required to be read are read if the data exist. According to the method, the shared memory area is divided, so that one processor writes data and the other processor reads data in each subarea, the two processors are prevented from writing and reading data in the same area, the conflict problem of the two processors is solved, the data access speed is effectively increased, data notification is performed according to the intercept instruction, and the real-time performance of data access is improved.

Description

technical field [0001] The invention relates to the field of data processing, in particular to a shared memory-based data access method and device. Background technique [0002] In the existing technology, the main method for data interaction between processors is the serial communication module (UART, USB, etc.), this communication mode can basically meet the requirements of most applications, but in applications with large data volume and high time requirements However, shared memory technology is one of the communication methods for data interaction between multi-core processors. It is designed to enable multi-cores to cooperate to complete a specific function, and access data quickly and in real time. However, the occurrence of access conflicts between multi-core shared memory data access is a difficult problem for most engineers in software application development. The existing shared memory data interaction technology does not have a unified method, and software engine...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, the main method for data interaction between processors is the serial communication module (UART, USB, etc.), this communication mode can basically meet the requirements of most applications, but in applications with large data volume and high time requirements However, shared memory technology is one of the communication methods for data interaction between multi-core processors. It is designed to enable multi-cores to cooperate to complete a specific function, and access data quickly and in real time. However, the occurrence of access conflicts between multi-core shared memory data access is a difficult problem for most engineers in software application development. The existing shared memory data interaction technology does not have a unified method, and software engineers are designing such applications. When accessing data, there are often data access errors, memory access out of bounds, and serious system crashes. The usual implementation method is: A and B processors apply for a shared memory as a data exchange buffer, and A processor uses memory in this memory area. Put new data and set flag C, processor B detects whether there is data in this memory area, and tries to take away the data and modify flag C, but at this time, if processor A receives new data and needs to put it in this memory area, When the B processor has not modified the flag or taken the data, it caused the conflict of reading and writing of the data. The real-time requirements are relatively high. The B processor should have received the correct two packets of data. In fact, it only takes A packet of wrong data has arrived. In the existing method, the processor needs to constantly detect whether new data is received, and the frequency of use is too high

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