blob: 99c6c39537389316c388c340a6cc77f2cb675238 (
plain) (
blame)
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
|
#include "driver.h"
#include "machine/pcecommn.h"
#include "video/vdc.h"
#include "cpu/h6280/h6280.h"
/* system RAM */
unsigned char *pce_user_ram; /* scratch RAM at F8 */
struct pce_struct pce;
/* joystick related data*/
#define JOY_CLOCK 0x01
#define JOY_RESET 0x02
static int joystick_port_select; /* internal index of joystick ports */
static int joystick_data_select; /* which nibble of joystick data we want */
static UINT8 (*pce_joystick_readinputport_callback)(void) = NULL;
DRIVER_INIT( pce ) {
pce.io_port_options = PCE_JOY_SIG | CONST_SIG;
}
MACHINE_RESET( pce ) {
}
/* todo: how many input ports does the PCE have? */
WRITE8_HANDLER ( pce_joystick_w )
{
h6280io_set_buffer(data);
/* bump counter on a low-to-high transition of bit 1 */
if((!joystick_data_select) && (data & JOY_CLOCK))
{
joystick_port_select = (joystick_port_select + 1) & 0x07;
}
/* do we want buttons or direction? */
joystick_data_select = data & JOY_CLOCK;
/* clear counter if bit 2 is set */
if(data & JOY_RESET)
{
joystick_port_select = 0;
}
}
READ8_HANDLER ( pce_joystick_r )
{
UINT8 ret;
int data;
if ( pce_joystick_readinputport_callback != NULL )
{
data = pce_joystick_readinputport_callback();
}
else
{
data = readinputport(0);
}
if(joystick_data_select) data >>= 4;
ret = (data & 0x0F) | pce.io_port_options;
#ifdef UNIFIED_PCE
ret &= ~0x40;
#endif
return (ret);
}
void pce_set_joystick_readinputport_callback( UINT8 (*joy_read)(void))
{
pce_joystick_readinputport_callback = joy_read;
}
|