校验和计算器，对于网络协议需要加校验和功能，去掉包头。包尾，自动计算-Checksum calculator, check for network protocols and functions need to add, remove header. Rear, automatic calculation

crc校验的一种计算方式，可以用于网络协议或串口、can协议的校验位计算，有封装好的函数-A calculation crc check can be used for network protocols or serial port, can protocol parity bit calculation, there is a good function package