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// license: GPL-2.0+
// copyright-holders: Dirk Best
/***************************************************************************
SAM Mouse Interface for SAM Coupe
***************************************************************************/
#include "emu.h"
#include "mouse.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(SAM_MOUSE, sam_mouse_device, "sam_mouse", "SAM Coupe Mouse Interface")
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
static INPUT_PORTS_START( mouse )
PORT_START("buttons")
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_CODE(MOUSECODE_BUTTON1) PORT_NAME("Mouse Button 1")
PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_BUTTON3) PORT_CODE(MOUSECODE_BUTTON3) PORT_NAME("Mouse Button 3")
PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_BUTTON2) PORT_CODE(MOUSECODE_BUTTON2) PORT_NAME("Mouse Button 2")
PORT_BIT(0xf8, IP_ACTIVE_LOW, IPT_UNUSED)
PORT_START("x")
PORT_BIT(0xfff, 0x000, IPT_MOUSE_X) PORT_PLAYER(1) PORT_SENSITIVITY(50) PORT_KEYDELTA(0) PORT_REVERSE
PORT_START("y")
PORT_BIT(0xfff, 0x000, IPT_MOUSE_Y) PORT_PLAYER(1) PORT_SENSITIVITY(50) PORT_KEYDELTA(0)
INPUT_PORTS_END
ioport_constructor sam_mouse_device::device_input_ports() const
{
return INPUT_PORTS_NAME( mouse );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// sam_mouse_device - constructor
//-------------------------------------------------
sam_mouse_device::sam_mouse_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, SAM_MOUSE, tag, owner, clock),
device_samcoupe_mouse_interface(mconfig, *this),
m_io_buttons(*this, "buttons"),
m_io_x(*this, "x"),
m_io_y(*this, "y")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void sam_mouse_device::device_start()
{
// allocate timer
m_reset = timer_alloc(FUNC(sam_mouse_device::reset_tick), this);
// register for savestates
save_item(NAME(m_mouse_index));
save_item(NAME(m_mouse_data));
save_item(NAME(m_mouse_x));
save_item(NAME(m_mouse_y));
}
//-------------------------------------------------
// device_reset - device-specific startup
//-------------------------------------------------
void sam_mouse_device::device_reset()
{
m_mouse_index = 0;
m_mouse_data[0] = 0xff;
m_mouse_data[1] = 0xff;
}
//-------------------------------------------------
// reset_tick - reset the mouse index
//-------------------------------------------------
TIMER_CALLBACK_MEMBER(sam_mouse_device::reset_tick)
{
m_mouse_index = 0;
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
uint8_t sam_mouse_device::read()
{
uint8_t data;
// on a read, reset the timer
m_reset->adjust(attotime::from_usec(50));
// update when we are about to read the first real values
if (m_mouse_index == 2)
{
int mouse_x = m_io_x->read();
int mouse_y = m_io_y->read();
// distance moved
int mouse_dx = m_mouse_x - mouse_x;
int mouse_dy = m_mouse_y - mouse_y;
m_mouse_x = mouse_x;
m_mouse_y = mouse_y;
m_mouse_data[2] = m_io_buttons->read();
m_mouse_data[3] = (mouse_dy & 0xf00) >> 8;
m_mouse_data[4] = (mouse_dy & 0x0f0) >> 4;
m_mouse_data[5] = (mouse_dy & 0x00f) >> 0;
m_mouse_data[6] = (mouse_dx & 0xf00) >> 8;
m_mouse_data[7] = (mouse_dx & 0x0f0) >> 4;
m_mouse_data[8] = (mouse_dx & 0x00f) >> 0;
}
data = m_mouse_data[m_mouse_index++];
// reset if we are at the end
if (m_mouse_index == sizeof(m_mouse_data))
m_mouse_index = 1;
return data;
}
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