View source for TinyOS 2 Serial Communication Mechanism port on contiki

The source files for the TinyOS 2 serial communication mechanism on contiki:

'''core/dev/CPSL-tinyos-2x-serial.h'''
'''core/dev/CPSL-tinyos-2x-serial.c'''
'''core/dev/CPSL-tinyos2x-serial-header.h'''

My principle when implement this feature is try not to touch the original contiki source code.

To add the TinyOS 2 serial communication mechanism:

'''Step 1:'''

In '''core/dev/serial-line.h''', add the following definition:

#ifdef TINYOS_2X_SERIAL_PACKET
#include "CPSL-tinyos-2x-serial.h"
#endif

'''Step 2:'''

In '''core/dev/serial-line.c''', modify the function '''serial_line_input_byte''',

this function is invoked every time a character come in through the serial port.

In the function, add the following statements:

#ifdef TINYOS_2X_SERIAL_PACKET
  tinyos2x_serial_dispatcher(c);
#endif

Some note about the implementation:

There are 2 processes in this implementation:

'''tinyos2x_serial_unescape_process''', this process is invoked every time a packet has been

taken out from the byte stream. It will unescape the byte array received.

'''tinyos2x_serial_ack_send_process''', this process is invoked every time unescaping of the

byte array has been done, it will send ack packet to the server.

'''Send data to the server:'''

Suppose you have a data array called payload, its length is len. Just pass the data array and its

length to function '''send_data_to_server''' in CPSL-tinyos-2x-serial.c. Remember that the data

array only need to contain the payload, all other stuff in the packet will be automatically set

by this function.