STC15F2K32系列串口通讯实现，接收HEX码，输出字符串，波特率19200，8位数据，无检验，停止位1-STC15F2K32 serial communication, receive HEX code, the output string, baud rate 19200, the 8 bit data, no test, stop bit 1

atmega的串口发送，发送字符串，指定字符HEX，ASCii(Atmega serial transmission, send string, specifying the characters HEX, ASCii)

public static String encode(String in, String key) throws InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException { String hex = ""; byte[] bytIn = in.getBytes(