PNI TCM 5 - Manual (Page 50)

PNI Sensor Corporation Doc #1007537 r12
TCM3 & TCM5 User Manual- Sept 2011 Page 50
4.4.2.2 CommProtocol.cp File:
#include "CommProtocol.h"
// import an object that will provide a 10mSec tick count through a function called Ticks()
#include "TickGenerator.h"
//
// SerPort is an object that controls the physical serial interface. It handles sending out
// the characters, and buffers the characters read in until we are ready for them.
//
CommProtocol::CommProtocol(CommHandler * handler, SerPort * serPort)
: Process( "CommProtocol" )
{
mHandler = handler; // store the object that will parse the data when it
is fully received
mSerialPort = serPort;
Init();
}
//
// Initialize the serial port and variables that will control this process
//
void CommProtocol::Init(UInt32 baud)
{
SetBaud(baud);
mOldInLen = 0 ; // no data previously received
mStep = 1 ; // goto the first step of our process
}
//
// Put together the frame to send to the unit
//
void CommProtocol::SendData(UInt8 frameType, void * dataPtr, UInt32 len)
{
UInt8 * data = (UInt8 *)dataPtr; // the data to send
UInt32 index = 0 ; // our location in the frame we are putting together
UInt16 crc; // the CRC to add to the end of the packet
UInt16 count; // the total length the packet will be
count = (UInt16)len + kPacketMinSize;
// exit without sending if there is too much data to fit inside our packet
if (len > kBufferSize - kPacketMinSize) return ;