Software-Based Cyclic Redundancy Checks

In my personal projects, I often work with various sensors which require digital data verification. One such sensor required the use of a Cyclic Redundancy Check (CRC) to verify that the information that the micro-controller read from the sensor was being received correctly. A CRC is a method for calculating a checksum from an array of data. The software examples that I was able to find to develop my understanding of implementing a CRC were poorly documented. Moreover, these examples were often so optimized that the underlying behavior was not immediately recognizable. Many examples simply used a lookup table---which provided no satisfaction for my "what-makes-it-tick?" personality.

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