Linux下实现打开串口，从串口读取数据，并写入特定文件中的功能。-Achieve the Linux open the serial port, serial data read from and write to a specific file functions.

用51单片机和magtek实现磁卡三个磁道的解码，并读取磁卡的数据，输出到串口。-With 51 single-chip microcomputer and magtek swipe CARDS three track of decoding, and reads the file data, output to the serial port.