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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
 * nld_fourterm.c
 *
 */

#include <solver/nld_solver.h>
#include "nld_fourterm.h"
#include "../nl_setup.h"

NETLIB_NAMESPACE_DEVICES_START()

// ----------------------------------------------------------------------------------------
// nld_VCCS
// ----------------------------------------------------------------------------------------

NETLIB_START(VCCS)
{
	start_internal(NL_FCONST(1.0) / netlist().gmin());
	m_gfac = NL_FCONST(1.0);
}

void NETLIB_NAME(VCCS)::start_internal(const nl_double def_RI)
{
	register_param("G", m_G, 1.0);
	register_param("RI", m_RI, def_RI);

	register_terminal("IP", m_IP);
	register_terminal("IN", m_IN);
	register_terminal("OP", m_OP);
	register_terminal("ON", m_ON);

	register_terminal("_OP1", m_OP1);
	register_terminal("_ON1", m_ON1);

	m_IP.m_otherterm = &m_IN; // <= this should be NULL and terminal be filtered out prior to solving...
	m_IN.m_otherterm = &m_IP; // <= this should be NULL and terminal be filtered out prior to solving...

	m_OP.m_otherterm = &m_IP;
	m_OP1.m_otherterm = &m_IN;

	m_ON.m_otherterm = &m_IP;
	m_ON1.m_otherterm = &m_IN;

	connect_late(m_OP, m_OP1);
	connect_late(m_ON, m_ON1);
}

NETLIB_RESET(VCCS)
{
	const nl_double m_mult = m_G.Value() * m_gfac; // 1.0 ==> 1V ==> 1A
	const nl_double GI = NL_FCONST(1.0) / m_RI.Value();

	//printf("VCCS %s RI %f\n", name().cstr(), m_RI.Value());
	m_IP.set(GI);
	m_IN.set(GI);

	m_OP.set(m_mult, NL_FCONST(0.0));
	m_OP1.set(-m_mult, NL_FCONST(0.0));

	m_ON.set(-m_mult, NL_FCONST(0.0));
	m_ON1.set(m_mult, NL_FCONST(0.0));
}

NETLIB_UPDATE_PARAM(VCCS)
{
	NETLIB_NAME(VCCS)::reset();
}

NETLIB_UPDATE(VCCS)
{
	/* only called if connected to a rail net ==> notify the solver to recalculate */
	if (!m_IP.net().isRailNet())
		m_IP.schedule_solve();
	else if (!m_IN.net().isRailNet())
		m_IN.schedule_solve();
	else if (!m_OP.net().isRailNet())
		m_OP.schedule_solve();
	else if (!m_ON.net().isRailNet())
		m_ON.schedule_solve();
}

// ----------------------------------------------------------------------------------------
// nld_LVCCS
// ----------------------------------------------------------------------------------------

NETLIB_START(LVCCS)
{
	NETLIB_NAME(VCCS)::start();
	register_param("CURLIM", m_cur_limit, 1000.0);
}

NETLIB_RESET(LVCCS)
{
	NETLIB_NAME(VCCS)::reset();
}

NETLIB_UPDATE_PARAM(LVCCS)
{
	NETLIB_NAME(VCCS)::update_param();
}

NETLIB_UPDATE(LVCCS)
{
	NETLIB_NAME(VCCS)::update();
}

NETLIB_UPDATE_TERMINALS(LVCCS)
{
	const nl_double m_mult = m_G.Value() * m_gfac; // 1.0 ==> 1V ==> 1A
	const nl_double vi = m_IP.net().m_cur_Analog - m_IN.net().m_cur_Analog;

	if (std::abs(m_mult / m_cur_limit * vi) > 0.5)
		m_vi = m_vi + 0.2*std::tanh((vi - m_vi)/0.2);
	else
		m_vi = vi;

	const nl_double x = m_mult / m_cur_limit * m_vi;
	const nl_double X = std::tanh(x);

	const nl_double beta = m_mult * (1.0 - X*X);
	const nl_double I = m_cur_limit * X - beta * m_vi;

	m_OP.set(beta, NL_FCONST(0.0), I);
	m_OP1.set(-beta, NL_FCONST(0.0));

	m_ON.set(-beta, NL_FCONST(0.0), -I);
	m_ON1.set(beta, NL_FCONST(0.0));
	//printf("vi %f beta %f I %f\n", vi, beta, I);

}

// ----------------------------------------------------------------------------------------
// nld_CCCS
// ----------------------------------------------------------------------------------------

NETLIB_START(CCCS)
{
	start_internal(1.0);
	m_gfac = NL_FCONST(1.0) / m_RI.Value();
}

NETLIB_RESET(CCCS)
{
	NETLIB_NAME(VCCS)::reset();
}

NETLIB_UPDATE_PARAM(CCCS)
{
	NETLIB_NAME(VCCS)::update_param();
}

NETLIB_UPDATE(CCCS)
{
	NETLIB_NAME(VCCS)::update();
}

// ----------------------------------------------------------------------------------------
// nld_VCVS
// ----------------------------------------------------------------------------------------

NETLIB_START(VCVS)
{
	NETLIB_NAME(VCCS)::start();

	register_param("RO", m_RO, 1.0);

	register_terminal("_OP2", m_OP2);
	register_terminal("_ON2", m_ON2);

	m_OP2.m_otherterm = &m_ON2;
	m_ON2.m_otherterm = &m_OP2;

	connect_late(m_OP2, m_OP1);
	connect_late(m_ON2, m_ON1);
}

NETLIB_RESET(VCVS)
{
	m_gfac = NL_FCONST(1.0) / m_RO.Value();
	NETLIB_NAME(VCCS)::reset();

	m_OP2.set(NL_FCONST(1.0) / m_RO.Value());
	m_ON2.set(NL_FCONST(1.0) / m_RO.Value());
}

NETLIB_UPDATE_PARAM(VCVS)
{
}

NETLIB_NAMESPACE_DEVICES_END()