MC100/Simulink/PWM_sfcn_rtw/rtGetNaN.c

/*
 * rtGetNaN.c
 *
 * Code generation for model "PWM_sf".
 *
 * Model version              : 1.825
 * Simulink Coder version : 9.4 (R2020b) 29-Jul-2020
 * C source code generated on : Fri Apr 14 12:53:29 2023
 *
 * Target selection: rtwsfcn.tlc
 * Note: GRT includes extra infrastructure and instrumentation for prototyping
 * Embedded hardware selection: ARM Compatible->ARM Cortex-M
 * Emulation hardware selection:
 *    Differs from embedded hardware (MATLAB Host)
 * Code generation objectives:
 *    1. Execution efficiency
 *    2. RAM efficiency
 * Validation result: Not run
 */

/*
 * Abstract:
 *      Function to initialize non-finite, NaN
 */
#include "rtGetNaN.h"
#define NumBitsPerChar                 8U

/*
 * Initialize rtNaN needed by the generated code.
 * NaN is initialized as non-signaling. Assumes IEEE.
 */
real_T rtGetNaN(void)
{
  size_t bitsPerReal = sizeof(real_T) * (NumBitsPerChar);
  real_T nan = 0.0;
  if (bitsPerReal == 32U) {
    nan = rtGetNaNF();
  } else {
    uint16_T one = 1U;
    enum {
      LittleEndian,
      BigEndian
    } machByteOrder = (*((uint8_T *) &one) == 1U) ? LittleEndian : BigEndian;
    switch (machByteOrder) {
     case LittleEndian:
      {
        union {
          LittleEndianIEEEDouble bitVal;
          real_T fltVal;
        } tmpVal;

        tmpVal.bitVal.words.wordH = 0xFFF80000U;
        tmpVal.bitVal.words.wordL = 0x00000000U;
        nan = tmpVal.fltVal;
        break;
      }

     case BigEndian:
      {
        union {
          BigEndianIEEEDouble bitVal;
          real_T fltVal;
        } tmpVal;

        tmpVal.bitVal.words.wordH = 0x7FFFFFFFU;
        tmpVal.bitVal.words.wordL = 0xFFFFFFFFU;
        nan = tmpVal.fltVal;
        break;
      }
    }
  }

  return nan;
}

/*
 * Initialize rtNaNF needed by the generated code.
 * NaN is initialized as non-signaling. Assumes IEEE.
 */
real32_T rtGetNaNF(void)
{
  IEEESingle nanF = { { 0 } };

  uint16_T one = 1U;
  enum {
    LittleEndian,
    BigEndian
  } machByteOrder = (*((uint8_T *) &one) == 1U) ? LittleEndian : BigEndian;
  switch (machByteOrder) {
   case LittleEndian:
    {
      nanF.wordL.wordLuint = 0xFFC00000U;
      break;
    }

   case BigEndian:
    {
      nanF.wordL.wordLuint = 0x7FFFFFFFU;
      break;
    }
  }

  return nanF.wordL.wordLreal;
}