1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/**********************************************************************
Atari Video Computer System Driving Wheel emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "wheel.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type VCS_WHEEL = &device_creator<vcs_wheel_device>;
static INPUT_PORTS_START( vcs_wheel )
PORT_START("JOY")
PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_BUTTON1 ) // Pin 6
PORT_BIT( 0xdc, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_START("WHEEL")
PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(40) PORT_KEYDELTA(5)
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor vcs_wheel_device::device_input_ports() const
{
return INPUT_PORTS_NAME( vcs_wheel );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// vcs_wheel_device - constructor
//-------------------------------------------------
vcs_wheel_device::vcs_wheel_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, VCS_WHEEL, "Atari / CBM Driving Wheel", tag, owner, clock, "vcs_wheel", __FILE__),
device_vcs_control_port_interface(mconfig, *this),
m_joy(*this, "JOY"),
m_wheel(*this, "WHEEL")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void vcs_wheel_device::device_start()
{
}
//-------------------------------------------------
// vcs_joy_r - joystick read
//-------------------------------------------------
UINT8 vcs_wheel_device::vcs_joy_r()
{
static const UINT8 driving_lookup[4] = { 0x00, 0x02, 0x03, 0x01 };
return m_joy->read() | driving_lookup[ ( m_wheel->read() & 0x18 ) >> 3 ];
}
|