reprapfirmware-dc42/PrintMonitor.h

/****************************************************************************************************

RepRapFirmware - PrintMonitor

This class provides methods to obtain print end-time estimations and file information from generated
G-Code files, which may be reported to auxiliary devices and to the web interface using status responses.

-----------------------------------------------------------------------------------------------------

Version 0.1

Created on: Feb 24, 2015

Christian Hammacher

Licence: GPL

****************************************************************************************************/

#ifndef PRINTMONITOR_H
#define PRINTMONITOR_H

const FilePosition GCODE_HEADER_SIZE = 8192uL;		// How many bytes to read from the header
const FilePosition GCODE_FOOTER_SIZE = 128000uL;	// How many bytes to read from the footer
const size_t GCODE_READ_SIZE = 1024;				// How many bytes to read in one go in GetFileInfo() (should be a multiple of 4 for read efficiency)
const size_t GCODE_OVERLAP_SIZE = 100;				// Size of the overlapping buffer for searching (should be a multple of 4 as well)

const float LAYER_HEIGHT_TOLERANCE = 0.025;			// For comparing two Z heights (in mm)

const size_t MAX_LAYER_SAMPLES = 5;					// Number of layer samples for end-time estimation (except for first layer)
const float ESTIMATION_MIN_FILAMENT_USAGE = 0.01;	// Minimum per cent of filament to be printed before the filament-based estimation returns values
const float FIRST_LAYER_SPEED_FACTOR = 0.25;		// First layer speed factor compared to other layers (only for layer-based estimation)

enum PrintEstimationMethod
{
	filamentBased,
	fileBased,
	layerBased
};

// Struct to hold Gcode file information
struct GCodeFileInfo
{
	bool isValid;
	FilePosition fileSize;
	float firstLayerHeight;
	float objectHeight;
	float filamentNeeded[DRIVES - AXES];
	unsigned int numFilaments;
	float layerHeight;
	char generatedBy[50];
};

enum FileParseState
{
	notParsing,
	parsingHeader,
	parsingFooter
};

class PrintMonitor
{
	public:
		PrintMonitor(Platform *p, GCodes *gc);
		void Spin();
		void Init();

		bool IsPrinting() const;						// Is a file being printed?
		void StartingPrint(const char *filename);		// Called to indicate a file will be printed (see M23)
		void StartedPrint();							// Called whenever a new live print starts (see M24)
		void StoppedPrint();							// Called whenever a file print has stopped

		// The following two methods need to be called until they return true - this may take a few runs
		bool GetFileInfo(const char *directory, const char *fileName, GCodeFileInfo& info);
		bool GetFileInfoResponse(const char *filename, OutputBuffer *&response);
		void StopParsing(const char *filename);

		// Return an estimate in seconds based on a specific estimation method
		float EstimateTimeLeft(PrintEstimationMethod method) const;

		// Provide some information about the file being printed
		unsigned int GetCurrentLayer() const;
		float GetCurrentLayerTime() const;
		float GetPrintDuration() const;
		float GetWarmUpDuration() const;
		float GetFirstLayerDuration() const;
		float GetFirstLayerHeight() const;

	private:
		Platform *platform;
		GCodes *gCodes;
		float longWait;

		// Information/Events concerning the file being printed
		void WarmUpComplete();
		void FirstLayerComplete();
		void LayerComplete();

		bool isPrinting, isHeating;
		float printStartTime;
		float pauseStartTime, totalPauseTime;

		unsigned int currentLayer;
		float warmUpDuration, firstLayerDuration;
		float firstLayerFilament, firstLayerProgress;
		float lastLayerChangeTime, lastLayerFilament;

		unsigned int numLayerSamples;
		float layerDurations[MAX_LAYER_SAMPLES];
		float filamentUsagePerLayer[MAX_LAYER_SAMPLES];
		float fileProgressPerLayer[MAX_LAYER_SAMPLES];
		float layerEstimatedTimeLeft;

		// We parse G-Code files in multiple stages. These variables hold the required information
		FileParseState parseState;
		char filenameBeingParsed[FILENAME_LENGTH];
		FileStore *fileBeingParsed;
		GCodeFileInfo parsedFileInfo;

		char fileOverlap[GCODE_OVERLAP_SIZE];
		size_t fileOverlapLength;

		bool printingFileParsed;
		GCodeFileInfo printingFileInfo;
		char filenameBeingPrinted[FILENAME_LENGTH];

		// G-Code parser methods
		bool FindHeight(const char* buf, size_t len, float& height) const;
		bool FindFirstLayerHeight(const char* buf, size_t len, float& layerHeight) const;
		bool FindLayerHeight(const char* buf, size_t len, float& layerHeight) const;
		unsigned int FindFilamentUsed(const char* buf, size_t len, float *filamentUsed, unsigned int maxFilaments) const;

		float accumulatedParseTime, accumulatedReadTime;

		// Helper methods
		bool HeightMatches(float actual, float expected) const;
};

inline bool PrintMonitor::IsPrinting() const { return isPrinting; }
inline unsigned int PrintMonitor::GetCurrentLayer() const { return currentLayer; }
inline float PrintMonitor::GetCurrentLayerTime() const { return (lastLayerChangeTime > 0.0) ? (GetPrintDuration() - lastLayerChangeTime) : 0.0; }
inline float PrintMonitor::GetWarmUpDuration() const { return (warmUpDuration > 0.0) ? warmUpDuration : (isHeating ? GetPrintDuration() : 0.0); }
inline float PrintMonitor::GetFirstLayerDuration() const { return (firstLayerDuration > 0.0) ? firstLayerDuration : ((warmUpDuration > 0) ? GetPrintDuration() - warmUpDuration : 0.0); }
inline float PrintMonitor::GetFirstLayerHeight() const { return printingFileParsed ? printingFileInfo.firstLayerHeight : 0.0; }

inline bool PrintMonitor::HeightMatches(float actual, float expected) const { return (expected - LAYER_HEIGHT_TOLERANCE < actual) && (expected + LAYER_HEIGHT_TOLERANCE > actual); }

#endif /* PRINTMONITOR_H */

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