PNI CompassPoint V2Xe - Manual (Page 11)

PNI Sensor Corporation DOC#1017814 r01
V2Xe User Manual – May 2012 Page 9
5.2 Parameter Formats
Note: Floating-point based parameters conform to ANSI/IEEE Std 754-1985. Please refer to the
Standard for more information. PNI also recommends the user refer to the compiler’s instructions to
understand how the compiler implements floating-point format.
32 Bit Floating Point (Float32)
Shown below is the 32 bit float format in big Endian. In little Endian format, the 4
bytes are in reverse order (LSB first).
Exponent S Mantissa
3130 23 22 0
The value (v) is determined as, if and only if 0 < Exponent < 255): v = (-1)
S
*
2(Exponent-127) * 1.Mantissa. Zero is represented by 4 bytes of zeros.
Signed 32 Bit Integer (SInt32)
SInt32-based parameters are signed 32 bit numbers (2’s compliment). Bit 31
represents the sign of the value (0=positive, 1=negative)
msb
31 24 23 16 15 8
lsb
7 0
Big Endian
lsb
7 0 15 8 23 16
msb
31 24
Little Endian
Signed 16 Bit Integer (SInt16)
SInt16-based parameters are signed 16 bit numbers (2’s compliment). Bit 15
represents the sign of the value (0=positive, 1=negative)
Big Endian
msb
15 8
lsb
7 0
Little Endian
lsb
7 0
msb
15 8