Texas Instruments C28 Series - Subtraction of a Complex Scalar from a Complex Vector

Function Descriptions
3.36 Subtraction of a Complex Scalar from a Complex Vector
Description:
This module subtracts a complex scalar from a complex vector.
Y
re
[i] = X
re
[i] − C
re
Y
im
[i] = X
im
[i] − C
im
Header File:
FPU.h
Declaration:
void sub_SP_CSxCV(complex_float
*
y, const complex_float
*
x,
const complex_float c, const Uint16 N)
Usage:
sub_SP_CSxCV(y, w, c, N);
complex_float *y
result complex array
complex_float *x
input complex array
complex_float c
input complex scalar
Uint16 N
length of x and y arrays
The type “complex_float” is defined as
typedef struct{
float32 dat[2];
}complex_float;
Element dat[0] is the real part, dat[1] is the imaginary part.
Alignment Requirements:
None
Notes:
1. N must be at least 2
Example:
#include "FPU.h"
#define N 4
complex_float c, x[N], y[N];
main()
{
sub_SP_CSxCV(y, x, c, N);
}
Benchmark Information:
Number of Cycles = 4*N + 18 cycles (including the call and return)
Sep 10, 2012 70