Remove CRC check for CC2420 (ZZ)

1. Modify CC2420ActiveMessageP.nc in /opt/tinyos-2.1.0/tos/chips/CC2420

remove line 173-175:

//if(!(call CC2420PacketBody.getMetadata(msg))->crc) {
// return msg;
//}

2. Modify CC2420ReceiveP.nc in /opt/tinyos-2.1.0/tos/chips/CC2420/receive

modify line 294-303:

// We may have received an ack that should be processed by Transmit
// buf[rxFrameLength] >> 7 checks the CRC
if (rx_buf ) {
uint8_t type = ( header->fcf >> IEEE154_FCF_FRAME_TYPE ) & 7;
signal CC2420Receive.receive( type, m_p_rx_buf );
post receiveDone_task();
return;
}

3. install code to Base Notes:
cd RssiBase
make micaz clear
make micaz
make micaz install,0 mib510,/dev/ttyUSB0

4. Compile C codes:
gcc SER_1.c libmote.a -o SER_1 -lm

5. Execute
./SER_1 /dev/ttyUSB1 57600