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/**********************************************************************
Sega Master System "Paddle Control" emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "sms_paddle.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type SMS_PADDLE = &device_creator<sms_paddle_device>;
#define PADDLE_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/256)
CUSTOM_INPUT_MEMBER( sms_paddle_device::dir_pins_r )
{
UINT8 data = m_paddle_x->read();
if (m_read_state)
data >>= 4;
// The returned value is inverted due to IP_ACTIVE_LOW mapping.
return ~data;
}
CUSTOM_INPUT_MEMBER( sms_paddle_device::tr_pin_r )
{
// The returned value is inverted due to IP_ACTIVE_LOW mapping.
return ~m_read_state;
}
static INPUT_PORTS_START( sms_paddle )
PORT_START("CTRL_PORT")
PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_paddle_device, dir_pins_r, NULL) // Directional pins
PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) // Vcc
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) // TL
PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED ) // TH
PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_CUSTOM_MEMBER(DEVICE_SELF, sms_paddle_device, tr_pin_r, NULL)
PORT_START("PADDLE_X") // Paddle knob
PORT_BIT( 0xff, 0x80, IPT_PADDLE) PORT_SENSITIVITY(40) PORT_KEYDELTA(20) PORT_CENTERDELTA(0) PORT_MINMAX(0,255)
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor sms_paddle_device::device_input_ports() const
{
return INPUT_PORTS_NAME( sms_paddle );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// sms_paddle_device - constructor
//-------------------------------------------------
sms_paddle_device::sms_paddle_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, SMS_PADDLE, "Paddle", tag, owner, clock, "sms_paddle", __FILE__),
device_sms_control_port_interface(mconfig, *this),
m_paddle_pins(*this, "CTRL_PORT"),
m_paddle_x(*this, "PADDLE_X"),
m_interval(PADDLE_INTERVAL)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void sms_paddle_device::device_start()
{
m_start_time = machine().time();
m_read_state = 0;
save_item(NAME(m_start_time));
save_item(NAME(m_read_state));
}
//-------------------------------------------------
// sms_peripheral_r - paddle read
//-------------------------------------------------
UINT8 sms_paddle_device::peripheral_r()
{
int num_intervals = (machine().time() - m_start_time).as_double() / m_interval.as_double();
m_read_state = num_intervals & 1;
return m_paddle_pins->read();
}
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