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#include "emu.h"
#include "machine/pcecommn.h"
#include "video/vdc.h"
#include "cpu/h6280/h6280.h"
/* system RAM */
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)(running_machine &) = NULL;
void 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(&space->device(), 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(space->machine());
}
else
{
data = space->machine().root_device().ioport("JOY")->read();
}
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)(running_machine &))
{
pce_joystick_readinputport_callback = joy_read;
}
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