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r17387 Tuesday 21st August, 2012 at 23:08:19 UTC by Angelo Salese
(MESS) Fixed VDC-A/B hook-ups and added bare-bones pad communication, currently hangs with a cyan screen, nw
[src/mess/drivers]pcfx.c

trunk/src/mess/drivers/pcfx.c
r17386r17387
44
55  Driver file to handle emulation of the NEC PC-FX.
66
7  - BIOS error codes (guesses):
8    - Blue screen = MCU pad communication error
9    - Cyan screen = ?
10
711***************************************************************************/
812
913
r17386r17387
1216#include "video/huc6261.h"
1317#include "video/huc6270.h"
1418
19typedef struct _pcfx_pad_t pcfx_pad_t;
1520
21struct _pcfx_pad_t
22{
23   UINT8 ctrl[2];
24   UINT8 status[2];
25   UINT16 latch[2];
26};
27
1628class pcfx_state : public driver_device
1729{
1830public:
1931   pcfx_state(const machine_config &mconfig, device_type type, const char *tag)
2032      : driver_device(mconfig, type, tag)
2133      , m_maincpu(*this, "maincpu")
34      , m_huc6261(*this, "huc6261")
2235   { }
2336
2437   required_device<cpu_device> m_maincpu;
38   required_device<huc6261_device> m_huc6261;
2539
2640   virtual void machine_reset();
2741
r17386r17387
3246   UINT16 m_irq_pending;
3347   UINT8 m_irq_priority[8];
3448
49   pcfx_pad_t m_pad;
50
3551   DECLARE_READ16_MEMBER( irq_read );
3652   DECLARE_WRITE16_MEMBER( irq_write );
53   DECLARE_READ16_MEMBER( pad_r );
54   DECLARE_WRITE16_MEMBER( pad_w );
3755   inline void check_irqs();
3856   inline void set_irq_line(int line, int state);
3957   DECLARE_WRITE_LINE_MEMBER( irq8_w );
r17386r17387
5775   AM_RANGE( 0xFFF00000, 0xFFFFFFFF ) AM_ROMBANK("bank1")   /* ROM */
5876ADDRESS_MAP_END
5977
78READ16_MEMBER( pcfx_state::pad_r )
79{
80   UINT16 res;
81   UINT8 port_type = ((offset<<1) & 0x80) >> 7;
6082
83   if(((offset<<1) & 0x40) == 0)
84   {
85      // status
86      /*
87      ---- x---
88      ---- ---x incoming data state (0=available)
89      */
90      res = m_pad.status[port_type];
91      //printf("STATUS %d\n",port_type);
92   }
93   else
94   {
95      // received data
96      //printf("RX %d\n",port_type);
97      res = m_pad.latch[port_type] >> ((offset<<1) & 2) ? 16 : 0;
98
99      if(((offset<<1) & 0x02) == 0)
100         m_pad.status[port_type] &= ~8; // clear latch on LSB read according to docs
101   }
102
103   return res;
104}
105
106static TIMER_CALLBACK(pad_func)
107{
108   pcfx_state *state = machine.driver_data<pcfx_state>();
109   const char *const padnames[] = { "P1", "P2" };
110
111   state->m_pad.latch[param] = machine.root_device().ioport(padnames[param])->read();
112   state->m_pad.status[param] |= 8;
113   state->m_pad.ctrl[param] &= ~1; // ack TX line
114   // TODO: pad IRQ
115}
116
117WRITE16_MEMBER( pcfx_state::pad_w )
118{
119   UINT8 port_type = ((offset<<1) & 0x80) >> 7;
120
121   if(((offset<<1) & 0x40) == 0)
122   {
123      // control
124      /*
125      ---- -x-- receiver enable
126      ---- --x- enable multi-tap
127      ---- ---x enable send (0->1 transition)
128      */
129      if(data & 1 && (!(m_pad.ctrl[port_type] & 1)))
130      {
131         machine().scheduler().timer_set(attotime::from_msec(1), FUNC(pad_func), port_type); // TODO: time
132      }
133
134      m_pad.ctrl[port_type] = data & 7;
135      //printf("%04x CONTROL %d\n",data,port_type);
136   }
137   else
138   {
139      // transmitted data
140      //printf("%04x TX %d\n",data,port_type);
141   }
142}
143
61144static ADDRESS_MAP_START( pcfx_io, AS_IO, 32, pcfx_state )
62   AM_RANGE( 0x00000000, 0x000000FF ) AM_NOP   /* PAD */
145   AM_RANGE( 0x00000000, 0x000000FF ) AM_READWRITE16(pad_r, pad_w, 0xffffffff)   /* PAD */
63146   AM_RANGE( 0x00000100, 0x000001FF ) AM_NOP   /* HuC6230 */
64147   AM_RANGE( 0x00000200, 0x000002FF ) AM_NOP   /* HuC6271 */
65148   AM_RANGE( 0x00000300, 0x000003FF ) AM_DEVREADWRITE16( "huc6261", huc6261_device, read, write, 0xffff )   /* HuC6261 */
66   AM_RANGE( 0x00000400, 0x000004FF ) AM_DEVREADWRITE8( "huc6270_a", huc6270_device, read, write, 0xff )   /* HuC6270-A */
67   AM_RANGE( 0x00000500, 0x000005FF ) AM_DEVREADWRITE8( "huc6270_b", huc6270_device, read, write, 0xff )   /* HuC6270-B */
149   AM_RANGE( 0x00000400, 0x000004FF ) AM_DEVREADWRITE8( "huc6270_a", huc6270_device, read, write, 0xffff )   /* HuC6270-A */
150   AM_RANGE( 0x00000500, 0x000005FF ) AM_DEVREADWRITE8( "huc6270_b", huc6270_device, read, write, 0xffff )   /* HuC6270-B */
68151   AM_RANGE( 0x00000600, 0x000006FF ) AM_NOP   /* HuC6272 */
69152   AM_RANGE( 0x00000C80, 0x00000C83 ) AM_NOP
70153   AM_RANGE( 0x00000E00, 0x00000EFF ) AM_READWRITE16( irq_read, irq_write, 0xffff )   /* Interrupt controller */
r17386r17387
74157
75158
76159static INPUT_PORTS_START( pcfx )
160   /*
161   xxxx ---- ---- ---- ID (0xf = 6 button pad, 0xe = tap, 0xd = ?)
162   */
163   PORT_START("P1")
164   PORT_BIT( 0xf0000000, IP_ACTIVE_LOW, IPT_UNKNOWN )
165   PORT_BIT( 0x0fffffff, IP_ACTIVE_LOW, IPT_UNKNOWN )
166
167   PORT_START("P2")
168   PORT_BIT( 0xf0000000, IP_ACTIVE_LOW, IPT_UNKNOWN )
169   PORT_BIT( 0x0fffffff, IP_ACTIVE_LOW, IPT_UNKNOWN )
77170INPUT_PORTS_END
78171
79172
r17386r17387
194287{
195288   if ( state )
196289   {
197printf("Setting irq line %d\n", line);
290//printf("Setting irq line %d\n", line);
198291      m_irq_pending |= ( 1 << ( 15 - line ) );
199292   }
200293   else
201294   {
202printf("Clearing irq line %d\n", line);
295//printf("Clearing irq line %d\n", line);
203296      m_irq_pending &= ~( 1 << ( 15 - line ) );
204297   }
205298   check_irqs();
r17386r17387
279372
280373UINT32 pcfx_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
281374{
375   m_huc6261->video_update( bitmap, cliprect );
282376   return 0;
283377}
284378

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