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Method for storing and deleting data of SD card by using embedded ARM processor

A technology of ARM processor and deletion method, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of processor waste of resources, real-time impact, etc., and achieve faster data storage and deletion, and simple transplantation , the effect of reducing resource usage

Inactive Publication Date: 2011-02-09
CHANGAN UNIV
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Problems solved by technology

[0004] Existing embedded real-time data acquisition systems generally use embedded ARM processors without an operating system to manage data acquisition and storage tasks. When operating SD cards, especially for real-time data acquisition applications, there will be small A large amount of data writing and data deletion requirements make the processor waste a lot of resources for processing low-speed peripheral time, and repeatedly switch between acquisition and storage tasks, resulting in a great impact on real-time performance

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  • Method for storing and deleting data of SD card by using embedded ARM processor
  • Method for storing and deleting data of SD card by using embedded ARM processor
  • Method for storing and deleting data of SD card by using embedded ARM processor

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[0026] After the SD card is powered on, it enters the SD communication mode by default. At this time, the SD card needs to be initialized. The initialization process mainly completes the setting of the working frequency of the SD card, the acquisition of information such as the capacity of the card, and the size of the card. The most important thing is the SD card For the setting of the data block length, the block size is generally set to 512 bytes in the embedded field, which is also consistent with the default allocation unit size of the Windows operating system. This process is done by writing SD card command to SD card.

[0027] The full English name of FAT is File Allocation Table, which means a file allocation table, and 32 means that the cluster number of each file cluster uses 32 bits to address. A cluster is the smallest unit of file access. The file system divides and manages the storage space of the data area by cluster. The cluster is the basic unit of space alloc...

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Abstract

The invention discloses a method for storing and deleting data of a secure digital (SD) card by using an embedded advanced RISC machines (ARM) processor. The data is quantitatively or regularly stored and quickly deleted by a cache and a timer on an ARM-based data acquisition system. According to the characteristic of real-time data acquisition and data storage and deletion application, data operation with high randomness and burstiness is written into the SD card in a fixed size or fixed time mode through the cache and the timer, and a judgment mode is introduced into data delete operation, so that times for repeatedly reading and writing the data in a certain cluster are reduced, the resource occupancy rate of the processor in an event is greatly reduced, data storage and deletion speed is improved by over 400 percent; the method is independent of an operating system, and the data is easy to transplant; and the capability of the system of acquiring and processing the data in real time is improved.

Description

technical field [0001] The invention relates to a method for storing computer data, in particular to a method for storing and deleting SD card data for an embedded ARM (Advanced RISC Machines) processor. Background technique [0002] With the rapid development of embedded technology, especially in industrial control, embedded systems are more and more widely used because of their strong specificity, low cost, high performance and good stability. The microprocessor based on the ARM core is widely used in embedded industrial control due to its high performance, low cost, low energy consumption, rich external expansion circuits, and convenient development. [0003] As an important part of the embedded field, data acquisition and storage saves a large number of real-time collected data and data used by the embedded system. SD card is widely used for its large capacity and high performance. At the same time, it is an integrated solid medium without any moving parts, so there is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/06G06F17/30
Inventor 赵祥模惠飞余腾史昕杨澜雷涛
Owner CHANGAN UNIV
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