avdweb_SWscope.h

/*
Copyright (C) 2016  Albert van Dalen http://www.avdweb.nl
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version. This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License at
http://www.gnu.org/licenses .
*/

#ifndef avdweb_SWscope_H
#define avdweb_SWscope_H

#include <Arduino.h>

#if defined(__arm__)
const unsigned int maxScopeBytes = 7000; // SAMD21: max ~ 7000
#else
const int maxScopeBytes =
    100; // ATTENTION SET HERE, AVR ATmega328: max ~ 780 ATmega168: max ~ 320
#endif

class SWscope {
public:
  void start(byte _channels, int _preSamples = 0,
             unsigned int _recordLenght = 65535);
  void probeA(short valueA);
  void probeAB(short valueA, short valueB);
  void probeABC(short valueA, short valueB, short valueC);
  void probeABCD(short valueA, short valueB, short valueC, short valueD);
  void trigger();
  void stop();
  void showIfReady();
  void testBuffer();

  bool canShow;

protected:
  void sampleControl();
  unsigned int calcPtr(int ptr);

  union {
    short chA[maxScopeBytes / 2];
    short chAB[maxScopeBytes / 4][2];
    short chABC[maxScopeBytes / 3][3];
    short chABCD[maxScopeBytes / 8][4];
  } ringBuffer;

  unsigned long sample0_us, usPerDiv;
  bool triggered, samplingOn;
  byte channels; // 1, 2, 3, 4 channels
  int recordLenght, preSamples, ptr, samples, triggerPtr, stopPtr;
};

#endif /* avdweb_SWscope_H */