Embedded Software and Motor Control Libraries for PXR40xx

Function GFLIB_AtanYXShifted_F16
}
f32Ang = GFLIB_AtanYXShifted (f32InY, f32InX, &Param, Define F32);
// ##############################################################
// Available only if 32-bit fractional implementation selected
// as default
// ##############################################################
// f32Ang contains 0x11c6cdfc, the theoretical value is 0x1C34824B
f32Ang = GFLIB_AtanYXShifted (f32InY, f32InX, &Param);
4.38 Function GFLIB_AtanYXShifted_F16
This function calculates the angle of two sine waves shifted in phase to each other.
4.38.1 Declaration
tFrac16 GFLIB_AtanYXShifted_F16(tFrac16 f16InY, tFrac16 f16InX, GFLIB_ATANYXSHIFTED_T_F16
*pParam);
4.38.2 Arguments
Table 4-48. GFLIB_AtanYXShifted_F16 arguments
Type Name Direction Description
tFrac16 f16InY input The value of the first signal, assumed to be sin( θ).
tFrac16 f16InX input The value of the second signal, assumed to be sin( θ + Δθ).
GFLIB_ATANYXSHIFT
ED_T_F16 *
4.38.3 Return
pParam input,
output
The parameters for the function.
The function returns the angle of two sine waves shifted in phase to each other.
4.38.4 Description
The function calculates the angle of two sinusoidal signals, one shifted in phase to the
other. The phase shift between sinusoidal signals does not have to be π/2 and can be any
value.
It is assumed that the arguments of the function are as follows:
Embedded Software and Motor Control Libraries for PXR40xx, Rev. 1.0
258 Freescale Semiconductor, Inc.