PNI SeaTRAX - Manual (Page 65)

PNI Sensor Corporation DOC#1018154 r02
SeaTRAX User Manual Page 60
kCoeffCopySet = 18, // 18 - type UInt32
kAccelCoeffCopySet, // 19 - type UInt32
// Mounting Reference IDs
kMountedStandard = 1, // 1
kMountedXUp, // 2
kMountedYUp, // 3
kMountedStdPlus90, // 4
kMountedStdPlus180, // 5
kMountedStdPlus270, // 6
kMountedZDown // 7
kMountedXUpPlus90 // 8
kMountedXUpPlus180 // 9
kMountedXUpPlus270 // 10
kMountedYUpPlus90 // 11
kMountedYUpPlus180 // 12
kMountedYUpPlus270 // 13
kMountedZDownPlus90 // 14
kMountedZDownPlus180 // 15
kMountedZDownPlus270 // 16
// Result IDs
kErrNone = 0, // 0
kErrSave, // 1
};
// function to calculate CRC-16
UInt16 CRC(void * data, UInt32 len)
{
UInt8 * dataPtr = (UInt8 *)data;
UInt32 index = 0;
// Update the CRC for transmitted and received data using
// the CCITT 16bit algorithm (X^16 + X^12 + X^5 + 1).
UInt16 crc = 0;
while(len--)
{
crc = (unsigned char)(crc >> 8) | (crc << 8);
crc ^= dataPtr[index++];
crc ^= (unsigned char)(crc & 0xff) >> 4;
crc ^= (crc << 8) << 4;
crc ^= ((crc & 0xff) << 4) << 1;
}
return crc;
}