PNI CompassPoint Prime - Manual (Page 60)

PNI Sensor Corporation DOC# 1014177 r08
Prime User Manual – July 2011 Page 54
8.3 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")
{
// store the object that will parse the data when it is fully
// received
mHandler = handler;
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