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* libscopeprotocols                                                                                                    *
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* Copyright (c) 2012-2023 Andrew D. Zonenberg and contributors                                                         *
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#include "../scopehal/scopehal.h"
#include "DDJMeasurement.h"
#include "DCDMeasurement.h"

using namespace std;

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Construction / destruction

DCDMeasurement::DCDMeasurement(const string& color)
	: Filter(color, CAT_MEASUREMENT)
{
	AddStream(Unit(Unit::UNIT_FS), "data", Stream::STREAM_TYPE_ANALOG_SCALAR);

	//Set up channels
	CreateInput("DDJ");
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Factory methods

bool DCDMeasurement::ValidateChannel(size_t i, StreamDescriptor stream)
{
	if(stream.m_channel == NULL)
		return false;

	if( (i == 0) && (dynamic_cast<DDJMeasurement*>(stream.m_channel) != NULL) )
		return true;

	return false;
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Accessors

string DCDMeasurement::GetProtocolName()
{
	return "DCD";
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Actual decoder logic

void DCDMeasurement::Refresh()
{
	if(!VerifyAllInputsOK())
	{
		m_streams[0].m_value = NAN;
		return;
	}

	//Get the input data
	auto ddj = dynamic_cast<DDJMeasurement*>(GetInput(0).m_channel);
	float* table = ddj->GetDDJTable();

	//Check all of the bins and find total jitter for rising and falling edges.
	//Note that the table has LSB most recent, so 10...... is a rising edge and 01...... is a falling edge.
	//We check for zero in case the table is incomplete (this should not drag the mean down).
	int rising_count = 0;
	float rising_sum = 0;
	int falling_count = 0;
	float falling_sum = 0;
	for(int i=0; i<256; i++)
	{
		if(table[i] == 0)
			continue;

		if(i & 0x80)
		{
			rising_count ++;
			rising_sum += table[i];
		}
		else
		{
			falling_count ++;
			falling_sum += table[i];
		}
	}

	float rising_avg = rising_sum / rising_count;
	float falling_avg = falling_sum / falling_count;
	m_streams[0].m_value = fabs(rising_avg - falling_avg);
}
