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r17460 Saturday 25th August, 2012 at 04:15:46 UTC by Angelo Salese
Written up a bare-bones M50458 OSD video chip device, used by Nintendo Super System HW [Angelo Salese]
[src/emu/video]m50458.c m50458.h
[src/mame/drivers]nss.c

trunk/src/mame/drivers/nss.c
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298298#include "machine/eeprom.h"
299299#include "video/m50458.h"
300300#include "includes/snes.h"
301#include "rendlay.h"
301302
302303
303304class nss_state : public snes_state
304305{
305306public:
306307   nss_state(const machine_config &mconfig, device_type type, const char *tag)
307      : snes_state(mconfig, type, tag)
308      : snes_state(mconfig, type, tag),
309      m_m50458(*this,"m50458")
308310      { }
309311
312   required_device<m50458_device> m_m50458;
310313   UINT8 m_wram_wp_flag;
311314   UINT8 *m_wram;
312315   UINT8 m_nmi_enable;
316   UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
313317
314318   DECLARE_READ8_MEMBER(spc_ram_100_r);
315319   DECLARE_WRITE8_MEMBER(spc_ram_100_w);
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321325   DECLARE_WRITE8_MEMBER(eeprom_w);
322326};
323327
328UINT32 nss_state::screen_update( screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect )
329{
330   m_m50458->screen_update(screen,bitmap,cliprect);
331   return 0;
332}
324333
334
335
325336static ADDRESS_MAP_START( snes_map, AS_PROGRAM, 8, nss_state )
326337   AM_RANGE(0x000000, 0x2fffff) AM_READWRITE_LEGACY(snes_r_bank1, snes_w_bank1)   /* I/O and ROM (repeats for each bank) */
327338   AM_RANGE(0x300000, 0x3fffff) AM_READWRITE_LEGACY(snes_r_bank2, snes_w_bank2)   /* I/O and ROM (repeats for each bank) */
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715726#endif
716727INPUT_PORTS_END
717728
718static const gfx_layout nss_char_layout_16x18 =
719{
720   16,18,
721   RGN_FRAC(1,1),
722   1,
723   { 0 },
724   { 0, 1, 2, 3, 4, 5, 6, 7,8,9,10,11,12,13,14,15 },
725   { 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,8*16, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16, 16*16,17*16 },
726   16*18
727};
728729
729
730/* decoded for debugging purpose, this will be nuked in the end... */
731static GFXDECODE_START( nss )
732   GFXDECODE_ENTRY( "chargen",   0x00000, nss_char_layout_16x18,    0, 1 )
733GFXDECODE_END
734
735730static MACHINE_CONFIG_START( snes, nss_state )
736731
737732   /* basic machine hardware */
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776771   MCFG_CPU_IO_MAP(bios_io_map)
777772   MCFG_CPU_VBLANK_INT("screen", nss_vblank_irq)
778773
774   /* TODO: the screen should actually superimpose, but for the time being let's just separate outputs for now */
775   MCFG_DEFAULT_LAYOUT(layout_dualhsxs)
776
777   MCFG_SCREEN_ADD("osd", RASTER)
778   MCFG_SCREEN_REFRESH_RATE(60)
779   MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
780   MCFG_SCREEN_SIZE(24*12+22, 12*18+22)
781   MCFG_SCREEN_VISIBLE_AREA(0*8, 24*12-1, 0*8, 12*18-1)
782   MCFG_SCREEN_UPDATE_DRIVER(nss_state,screen_update)
783
779784   MCFG_EEPROM_ADD("eeprom", nss_eeprom_intf)
780785
781786   MCFG_M50458_ADD("m50458",4000000) /* TODO: clock */
782787
783   MCFG_GFXDECODE( nss )
784   MCFG_PALETTE_LENGTH(2)
785788   MCFG_MACHINE_START( nss )
786789MACHINE_CONFIG_END
787790
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799802   ROM_REGION(0x20000,         "bios",  0)      /* Bios CPU (what is it?) */ \
800803   ROM_LOAD("nss-c.dat"  , 0x00000, 0x8000, CRC(a8e202b3) SHA1(b7afcfe4f5cf15df53452dc04be81929ced1efb2) )   /* bios */ \
801804   ROM_LOAD("nss-ic14.02", 0x10000, 0x8000, CRC(e06cb58f) SHA1(62f507e91a2797919a78d627af53f029c7d81477) )   /* bios */ \
802   ROM_REGION( 0x1200, "chargen", ROMREGION_ERASEFF ) \
803   ROM_LOAD("m50458_char.bin",     0x0000, 0x1200, BAD_DUMP CRC(011cc342) SHA1(d5b9f32d6e251b4b25945267d7c68c099bd83e96) ) \
804   ROM_REGION( 0x1000, "m50458_gfx", ROMREGION_ERASEFF ) \
805   ROM_LOAD("m50458_char_mod.bin", 0x0000, 0x1000, BAD_DUMP CRC(8c4326ef) SHA1(21a63c5245ff7f3f70cb45e217b3045b19d0d799) ) \
806805   ROM_REGION( 0x2000, "dspprg", ROMREGION_ERASEFF) \
807806   ROM_REGION( 0x800, "dspdata", ROMREGION_ERASEFF)
808807
trunk/src/emu/video/m50458.c
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1616// device type definition
1717const device_type M50458 = &device_creator<m50458_device>;
1818
19static ADDRESS_MAP_START( m50458_vram, AS_0, 16, m50458_device )
20   AM_RANGE(0x0000, 0x023f) AM_RAM // vram
21   AM_RANGE(0x024e, 0x024f) AM_WRITE(vreg_127_w)
22ADDRESS_MAP_END
1923
24// internal GFX ROM (TODO: GFXs in here should be 12x18, not 16x18)
25ROM_START( m50458 )
26   ROM_REGION( 0x1200, "m50458", 0 )
27   ROM_LOAD("m50458_char.bin",     0x0000, 0x1200, BAD_DUMP CRC(011cc342) SHA1(d5b9f32d6e251b4b25945267d7c68c099bd83e96) )
28ROM_END
29
30WRITE16_MEMBER( m50458_device::vreg_127_w)
31{
32   if(data & 0x20) // RAMERS, display RAM is erased
33   {
34      int i;
35
36      for(i=0;i<0x120;i++)
37         write_word(i,0);
38   }
39}
40
41//-------------------------------------------------
42//  rom_region - device-specific ROM region
43//-------------------------------------------------
44
45const rom_entry *m50458_device::device_rom_region() const
46{
47   return ROM_NAME( m50458 );
48}
49
50//-------------------------------------------------
51//  memory_space_config - return a description of
52//  any address spaces owned by this device
53//-------------------------------------------------
54
55const address_space_config *m50458_device::memory_space_config(address_spacenum spacenum) const
56{
57   return (spacenum == AS_0) ? &m_space_config : NULL;
58}
59
2060//**************************************************************************
61//  INLINE HELPERS
62//**************************************************************************
63
64//-------------------------------------------------
65//  readbyte - read a byte at the given address
66//-------------------------------------------------
67
68inline UINT16 m50458_device::read_word(offs_t address)
69{
70   return space()->read_word(address << 1);
71}
72
73//-------------------------------------------------
74//  writebyte - write a byte at the given address
75//-------------------------------------------------
76
77inline void m50458_device::write_word(offs_t address, UINT16 data)
78{
79   space()->write_word(address << 1, data);
80}
81
82
83//**************************************************************************
2184//  LIVE DEVICE
2285//**************************************************************************
2386
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2689//-------------------------------------------------
2790
2891m50458_device::m50458_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
29   : device_t(mconfig, M50458, "m50458", tag, owner, clock)
92   : device_t(mconfig, M50458, "m50458", tag, owner, clock),
93     device_memory_interface(mconfig, *this),
94     m_space_config("videoram", ENDIANNESS_LITTLE, 16, 16, 0, NULL, *ADDRESS_MAP_NAME(m50458_vram))
3095{
3196
3297}
r17459r17460
76141
77142   if(m_reset_line != CLEAR_LINE)
78143   {
79      printf("Reset asserted\n");
144      //printf("Reset asserted\n");
80145      m_cmd_stream_pos = 0;
81146      m_current_cmd = 0;
82147      m_osd_state = OSD_SET_ADDRESS;
r17459r17460
108173                  m_osd_state = OSD_SET_DATA;
109174                  break;
110175               case OSD_SET_DATA:
111                  printf("%04x %04x\n",m_osd_addr,m_current_cmd);
112
176                  //printf("%04x %04x\n",m_osd_addr,m_current_cmd);
177                  write_word(m_osd_addr,m_current_cmd);
113178                  m_osd_addr++;
114179                  /* Presumably wraps at 0x127? */
115180                  if(m_osd_addr > 0x127) { m_osd_addr = 0; }
r17459r17460
122187      }
123188   }
124189}
190
191//-------------------------------------------------
192//  update_screen -
193//-------------------------------------------------
194
195UINT32 m50458_device::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
196{
197   int x,y;
198   UINT8 *pcg = memregion("m50458")->base();
199
200   for(y=0;y<12;y++)
201   {
202      for(x=0;x<24;x++)
203      {
204         int xi,yi;
205         UINT16 tile;
206
207         tile = read_word(x+y*24);
208
209         for(yi=0;yi<18;yi++)
210         {
211            for(xi=4;xi<16;xi++) /* TODO: remove 4 / 16 / -4 offset once that the ROM is fixed */
212            {
213               UINT8 pix;
214               UINT8 r,g,b;
215               UINT16 offset = ((tile & 0x7f)*36+yi*2);
216
217               if(xi>=8)
218                  pix = (pcg[offset+1] >> (7-(xi & 0x7))) & 1;
219               else
220                  pix = (pcg[offset+0] >> (7-(xi & 0x7))) & 1;
221
222               r = (tile & 0x100 && pix) ? 0xff : 0x00;
223               g = (tile & 0x200 && pix) ? 0xff : 0x00;
224               b = (tile & 0x400 && pix) ? 0xff : 0x00;
225
226               bitmap.pix32(y*18+yi,x*12+(xi-4)) = r << 16 | g << 8 | b;
227            }
228         }
229      }
230   }
231
232   return 0;
233}
trunk/src/emu/video/m50458.h
r17459r17460
3232
3333// ======================> m50458_device
3434
35class m50458_device :   public device_t
35class m50458_device :   public device_t,
36                  public device_memory_interface
3637{
3738public:
3839   // construction/destruction
r17459r17460
4243   WRITE_LINE_MEMBER( write_bit );
4344   WRITE_LINE_MEMBER( set_cs_line );
4445   WRITE_LINE_MEMBER( set_clock_line );
46   DECLARE_WRITE16_MEMBER(vreg_127_w);
4547
48   UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
49   virtual const rom_entry *device_rom_region() const;
50
4651protected:
4752   // device-level overrides
4853   virtual void device_validity_check(validity_checker &valid) const;
4954   virtual void device_start();
5055   virtual void device_reset();
56   virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
5157
5258   int m_latch;
5359   int   m_reset_line;
5460   int   m_clock_line;
55   int m_current_cmd;
61   UINT16 m_current_cmd;
5662   int m_cmd_stream_pos;
5763   UINT16 m_osd_addr;
5864
5965   m50458_state_t m_osd_state;
66private:
67   inline UINT16 read_word(offs_t address);
68   inline void write_word(offs_t address, UINT16 data);
69
70   const address_space_config      m_space_config;
6071};
6172
6273

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