在用单片机写通信程序是，如红外通信，RS485，MAX232等，串行发送数据的时候回出现发送和接收到的数据不一致，这时候就需要校验，CRC校验是一种快速有效的方式-In written communication with the microcontroller program is as infrared communication, RS485, MAX232, etc., when the serial transmit data back to the emergence of sending and receiving data inconsistencies, this time you need to check, CRC check is a quick and effective way