Embedded Software and Motor Control Libraries for PXR40xx

Function GFLIB_AtanYX_F16
In comparison to the GFLIB_Atan_F32 function, the GFLIB_AtanYX_F32 function
correctly places the calculated angle within the whole fractional range of [-1, 1), which
corresponds to the real angle range of [- π, π).
Note
The function calls the GFLIB_Atan_F32 function. The
computed value is within the range of [-1, 1).
4.34.5 Re-entrancy
The function is re-entrant.
4.34.6 Code Example
#include "gflib.h"
tFrac32 f32InY;
tFrac32 f32InX;
tFrac32 f32Ang;
void main(void)
{
// Angle 45 deg = PI/4 rad
f32InY = FRAC32 (0.5);
f32InX = FRAC32 (0.5);
}
// output should be close to 0x20001000
f32Ang = GFLIB_AtanYX_F32 (f32InY, f32InX);
// output should be close to 0x20001000
f32Ang = GFLIB_AtanYX (f32InY, f32InX, Define F32);
// ##############################################################
// Available only if 32-bit fractional implementation selected
// as default
// ##############################################################
// output should be close to 0x20001000
f32Ang = GFLIB_AtanYX (f32InY, f32InX);
4.35 Function GFLIB_AtanYX_F16
This function calculate the angle between the positive x-axis and the direction of a vector
given by the (x, y) coordinates.
Embedded Software and Motor Control Libraries for PXR40xx, Rev. 1.0
248 Freescale Semiconductor, Inc.