tan517

#include <80C517.h>

float tan517 (
  float x);      /* value to calculate tangent of */

The tan517 function calculates the tangent of the floating-point value x.

Note

• This routine uses the arithmetic unit of the Infineon C517x/C509 to provide accelerated execution speed. Do not use this routine with a CPU that does not support this feature.

The tan517 function returns the tangent of x.

The value of x must be in the range ±2^32 (±4294967296.0). Outside this value range an NaN error is returned.

For x = c (±π/2;), {c = (2k+1); k ∈ N}, tan517 returns ±INF.

cos, cos517, sin, sin517, tan

#include <80C517.h>
#include <stdio.h> /* for printf */

void tst_tan517 (void) {
  float x;
  float y;
  float pi;

  pi = 3.14159265;

  for (x = -(pi/4); x < (pi/4); x += 0.1) {
    y = tan517 (x);
    printf ("TAN517(%f) = %f\n", x, y);
  }
}