如何编写crc校验程序（How to write CRC check program）.docVIP

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如何编写crc校验程序（How to write CRC check program）.doc

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如何编写crc校验程序（How to write CRC check program）

如何编写crc校验程序（How to write CRC check program） How to write CRC check program under VB Published: quake123 read: 189 times Keywords: VB CRC font: [large, medium, small] With the continuous development of computer technology, in modern industry, the industrial control of data communication using microcomputer is more and more widely applied. Due to many possible factors such as transmission distance and site conditions, the communication data between the computer and the controlled device often results in unpredictable errors. In order to prevent the impact of error, the data verification method is usually used in communication, while cyclic redundancy check is one of the most commonly used methods. First, cyclic redundancy code verification principle, cyclic redundancy code verification, the English name is Cyclical, Redundancy, Check, referred to as CRC. It uses the division and remainder principle to make error detection (Error, Detecting). In practical application, the CRC value and sends the data to the receiving device together with the calculation of transmission device, receiving device to receive data to calculate CRC and compared with the received CRC, if two different value of CRC, the data communication error. According to the application environment and habits, CRC can be divided into the following standards: CRC-12 code; CRC-16 code; CRC-CCITT code; CRC-32 code. The CRC-12 code is usually used to transmit 6-bit strings. CRC-16 and CRC-CCITT codes are used to transmit 8-bit characters, of which CRC-16 is adopted in the United States, while CRC-CCITT is adopted by European countries. CRC-32 codes are mostly used in a synchronous transmission called Point-to-Point. The example of the most commonly used CRC-16 is used to illustrate its generative process. CRC-16 code consists of two bytes, in the beginning of the CRC register each preset to 1, then the CRC register and 8-bit data to the CRC register after XOR, from high to low displacement at the top (MSB) the