Diff: mbed-os/features/unsupported/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c

Revision:

0:6bf0743ece18

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/features/unsupported/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c	Sat Mar 28 15:28:19 2020 +0000
@@ -0,0 +1,149 @@
+/* ----------------------------------------------------------------------    
+* Copyright (C) 2010-2014 ARM Limited. All rights reserved.    
+*    
+* $Date:        19. March 2015
+* $Revision: 	V.1.4.5
+*    
+* Project: 	    CMSIS DSP Library    
+* Title:		arm_sin_cos_f32.c    
+*    
+* Description:	Sine and Cosine calculation for floating-point values.   
+*    
+* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
+*  
+* Redistribution and use in source and binary forms, with or without 
+* modification, are permitted provided that the following conditions
+* are met:
+*   - Redistributions of source code must retain the above copyright
+*     notice, this list of conditions and the following disclaimer.
+*   - Redistributions in binary form must reproduce the above copyright
+*     notice, this list of conditions and the following disclaimer in
+*     the documentation and/or other materials provided with the 
+*     distribution.
+*   - Neither the name of ARM LIMITED nor the names of its contributors
+*     may be used to endorse or promote products derived from this
+*     software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
+* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+* POSSIBILITY OF SUCH DAMAGE.   
+* -------------------------------------------------------------------- */
+
+#include "arm_math.h"
+#include "arm_common_tables.h"
+
+/**    
+ * @ingroup groupController    
+ */
+
+/**    
+ * @defgroup SinCos Sine Cosine   
+ *    
+ * Computes the trigonometric sine and cosine values using a combination of table lookup   
+ * and linear interpolation.     
+ * There are separate functions for Q31 and floating-point data types.   
+ * The input to the floating-point version is in degrees while the   
+ * fixed-point Q31 have a scaled input with the range   
+ * [-1 0.9999] mapping to [-180 +180] degrees.   
+ *
+ * The floating point function also allows values that are out of the usual range. When this happens, the function will
+ * take extra time to adjust the input value to the range of [-180 180].
+ *   
+ * The implementation is based on table lookup using 360 values together with linear interpolation.   
+ * The steps used are:   
+ *  -# Calculation of the nearest integer table index.   
+ *  -# Compute the fractional portion (fract) of the input.   
+ *  -# Fetch the value corresponding to \c index from sine table to \c y0 and also value from \c index+1 to \c y1.      
+ *  -# Sine value is computed as <code> *psinVal = y0 + (fract * (y1 - y0))</code>.    
+ *  -# Fetch the value corresponding to \c index from cosine table to \c y0 and also value from \c index+1 to \c y1.      
+ *  -# Cosine value is computed as <code> *pcosVal = y0 + (fract * (y1 - y0))</code>.    
+ */
+
+ /**    
+ * @addtogroup SinCos    
+ * @{    
+ */
+
+/**    
+ * @brief  Floating-point sin_cos function.   
+ * @param[in]  theta    input value in degrees    
+ * @param[out] *pSinVal points to the processed sine output.    
+ * @param[out] *pCosVal points to the processed cos output.    
+ * @return none.   
+ */
+
+void arm_sin_cos_f32(
+  float32_t theta,
+  float32_t * pSinVal,
+  float32_t * pCosVal)
+{
+  float32_t fract, in;                             /* Temporary variables for input, output */
+  uint16_t indexS, indexC;                         /* Index variable */
+  float32_t f1, f2, d1, d2;                        /* Two nearest output values */
+  int32_t n;
+  float32_t findex, Dn, Df, temp;
+
+  /* input x is in degrees */
+  /* Scale the input, divide input by 360, for cosine add 0.25 (pi/2) to read sine table */
+  in = theta * 0.00277777777778f;
+
+  /* Calculation of floor value of input */
+  n = (int32_t) in;
+
+  /* Make negative values towards -infinity */
+  if(in < 0.0f)
+  {
+    n--;
+  }
+  /* Map input value to [0 1] */
+  in = in - (float32_t) n;
+
+  /* Calculation of index of the table */
+  findex = (float32_t) FAST_MATH_TABLE_SIZE * in;
+  indexS = ((uint16_t)findex) & 0x1ff;
+  indexC = (indexS + (FAST_MATH_TABLE_SIZE / 4)) & 0x1ff;
+
+  /* fractional value calculation */
+  fract = findex - (float32_t) indexS;
+
+  /* Read two nearest values of input value from the cos & sin tables */
+  f1 = sinTable_f32[indexC+0];
+  f2 = sinTable_f32[indexC+1];
+  d1 = -sinTable_f32[indexS+0];
+  d2 = -sinTable_f32[indexS+1];
+
+  Dn = 0.0122718463030f; // delta between the two points (fixed), in this case 2*pi/FAST_MATH_TABLE_SIZE
+  Df = f2 - f1; // delta between the values of the functions
+  temp = Dn*(d1 + d2) - 2*Df;
+  temp = fract*temp + (3*Df - (d2 + 2*d1)*Dn);
+  temp = fract*temp + d1*Dn;
+
+  /* Calculation of cosine value */
+  *pCosVal = fract*temp + f1;
+  
+  /* Read two nearest values of input value from the cos & sin tables */
+  f1 = sinTable_f32[indexS+0];
+  f2 = sinTable_f32[indexS+1];
+  d1 = sinTable_f32[indexC+0];
+  d2 = sinTable_f32[indexC+1];
+
+  Df = f2 - f1; // delta between the values of the functions
+  temp = Dn*(d1 + d2) - 2*Df;
+  temp = fract*temp + (3*Df - (d2 + 2*d1)*Dn);
+  temp = fract*temp + d1*Dn;
+  
+  /* Calculation of sine value */
+  *pSinVal = fract*temp + f1;
+}
+/**    
+ * @} end of SinCos group    
+ */