// Automatically generated C++ file on Sat Dec 21 21:11:43 2024
//
// To build with Digital Mars C++ Compiler:
//
//    dmc -mn -WD set_frequency_limitation.cpp kernel32.lib

union uData
{
   bool b;
   char c;
   unsigned char uc;
   short s;
   unsigned short us;
   int i;
   unsigned int ui;
   float f;
   double d;
   long long int i64;
   unsigned long long int ui64;
   char *str;
   unsigned char *bytes;
};

// int DllMain() must exist and return 1 for a process to load the .DLL
// See https://docs.microsoft.com/en-us/windows/win32/dlls/dllmain for more information.
int __stdcall DllMain(void *module, unsigned int reason, void *reserved) { return 1; }

// #undef pin names lest they collide with names in any header file(s) you might include.
#undef set1
#undef set2

extern "C" __declspec(dllexport) void set_frequency_limitation(void **opaque, double t, union uData *data)
{
   bool  set1 = data[0].b; // input
   bool &set2 = data[1].b; // output

   // Static variables to track previous states
   static bool prev_set1 = false;  // Previous value of set1
   static double last_rising_edge_time = 0.0; // Time when set2 was set high
   static bool set2_high = false;  // Flag to check if set2 has been set high

   const double THRESHOLD_TIME = 30e-9; // 30ns in seconds

   // Detect rising edge of set1 (when set1 transitions from low to high)
   if (set1 && !prev_set1) {
      // Rising edge detected, set set2 high
      set2 = true;
      set2_high = true;
      last_rising_edge_time = t; // Record the time when set2 was set high
   }

   // If set2 was set high and 30ns have passed, check set1 state
   if (set2_high && (t - last_rising_edge_time) >= THRESHOLD_TIME) {
      if (!set1) {
         // If set1 is low after 30ns, set set2 low
         set2 = false;
      }
      set2_high = false; // Reset flag
   }

   // Update previous set1 state
   prev_set1 = set1;
}