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// license:BSD-3-Clause
// copyright-holders:cam900
/**********************************************************************
NEC PC Engine/TurboGrafx-16 Multi Tap emulation
Based on SMS controller port emulation (devices\bus\sms_ctrl\*.*)
by Fabio Priuli,
PC engine emulation (mame\*\pce.*)
by Charles MacDonald, Wilbert Pol, Angelo Salese
First party model (PI-PD003, and US released TurboTap and DuoTap)
has allowed up to 5 controllers, Third-party Multi Taps are has
allowed up to 2-4 controllers, and also compatible?
**********************************************************************/
#include "emu.h"
#include "multitap.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(PCE_MULTITAP, pce_multitap_device, "pce_multitap", "NEC PC Engine/TurboGrafx-16 Multi Tap")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// pce_multitap_device - constructor
//-------------------------------------------------
pce_multitap_device::pce_multitap_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, PCE_MULTITAP, tag, owner, clock),
device_pce_control_port_interface(mconfig, *this),
m_subctrl_port(*this, "ctrl%u", 1U),
m_port_sel(0),
m_prev_sel(0)
{
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void pce_multitap_device::device_add_mconfig(machine_config &config)
{
for (auto & elem : m_subctrl_port)
PCE_CONTROL_PORT(config, elem, pce_control_port_devices, "joypad2");
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pce_multitap_device::device_start()
{
save_item(NAME(m_port_sel));
save_item(NAME(m_prev_sel));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void pce_multitap_device::device_reset()
{
m_port_sel = 0;
m_prev_sel = false;
}
//-------------------------------------------------
// peripheral_r - multitap read
//-------------------------------------------------
u8 pce_multitap_device::peripheral_r()
{
u8 data = 0xf;
if (m_port_sel < 5) // up to 5 controller ports
data = m_subctrl_port[m_port_sel]->port_r();
return data;
}
//-------------------------------------------------
// sel_w - SEL pin write, with port select
//-------------------------------------------------
void pce_multitap_device::sel_w(int state)
{
for (auto & elem : m_subctrl_port)
elem->sel_w(state);
// bump counter on a low-to-high transition of SEL bit
if ((!m_prev_sel) && state)
m_port_sel = (m_port_sel + 1) & 7;
m_prev_sel = state;
}
//-------------------------------------------------
// clr_w - CLR pin write, with reset multitap
//-------------------------------------------------
void pce_multitap_device::clr_w(int state)
{
for (auto & elem : m_subctrl_port)
elem->clr_w(state);
// clear counter if Reset bit is set
if (state)
m_port_sel = 0;
}
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