2410串口程序，实现PC发送字符，然后通过2410串口再回来-2410 serial program achieve PC to send characters, and then come back through the 2410 serial

ARM监视串行口，将接收到的字符发送到字符再发送给串口，即按PC机键盘通过超级终端发送数据，开发板将接收到的数据再返还给PC，在超级终端上显示。-ARM monitors the serial port, the received characters are sent to a character and then sent to the serial port, ie the PC keyboard to send data via HyperTerminal, the board will

串口发送接收数据程序，用select函数进行接收(UART send and receive)