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Improved irqs in Little Robin, and hooked up sound index writes [Angelo Salese]

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This commit is contained in:
Angelo Salese 2012-03-27 22:02:24 +00:00
parent 0f1bacfa40
commit 7c14a675a0
1 changed files with 53 additions and 16 deletions
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63
src/mame/drivers/littlerb.c
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@ -70,7 +70,9 @@ class littlerb_state : public driver_device
{
public:
littlerb_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag) { }
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu")
{ }
UINT16 m_vdp_address_low;
UINT16 m_vdp_address_high;
@ -86,6 +88,9 @@ public:
int m_paldac_offset;
int m_type2_writes;
UINT32 m_lasttype2pc;
UINT8 m_sound_index_l,m_sound_index_r;
required_device<cpu_device> m_maincpu;
};
@ -99,6 +104,7 @@ WRITE16_HANDLER( region4_w )
static ADDRESS_MAP_START( littlerb_vdp_map8, AS_0, 16 )
// it ends up writing some gfx here (the bubbles when you shoot an enemy)
AM_RANGE(0x00000000, 0x0007ffff) AM_RAM
AM_RANGE(0x00080000, 0x003fffff) AM_RAM // temp so it doesn't fill the log
/* these are definitely written by a non-incrementing access to the VDP */
AM_RANGE(0x00800000, 0x00800001) AM_DEVWRITE8_MODERN("^ramdac", ramdac_device, index_w, 0x00ff)
@ -286,6 +292,27 @@ static WRITE16_HANDLER( littlerb_vdp_w )
}
/* could be slightly different (timing wise, directly related to the irqs), but certainly they smoked some bad pot for this messy way ... */
static UINT8 sound_data_shift(running_machine &machine)
{
return ((machine.primary_screen->frame_number() % 16) == 0) ? 8 : 0;
}
/* l is SFX, r is BGM (they doesn't seem to share the same data ROM) */
static WRITE16_HANDLER( littlerb_l_sound_w )
{
littlerb_state *state = space->machine().driver_data<littlerb_state>();
state->m_sound_index_l = (data >> sound_data_shift(space->machine())) & 0xff;
popmessage("%04x %04x",state->m_sound_index_l,state->m_sound_index_r);
}
static WRITE16_HANDLER( littlerb_r_sound_w )
{
littlerb_state *state = space->machine().driver_data<littlerb_state>();
state->m_sound_index_r = (data >> sound_data_shift(space->machine())) & 0xff;
popmessage("%04x %04x",state->m_sound_index_l,state->m_sound_index_r);
}
static ADDRESS_MAP_START( littlerb_main, AS_PROGRAM, 16 )
AM_RANGE(0x000008, 0x000017) AM_WRITENOP
AM_RANGE(0x000020, 0x00002f) AM_WRITENOP
@ -293,13 +320,22 @@ static ADDRESS_MAP_START( littlerb_main, AS_PROGRAM, 16 )
AM_RANGE(0x060004, 0x060007) AM_WRITENOP
AM_RANGE(0x000000, 0x0fffff) AM_ROM
AM_RANGE(0x200000, 0x203fff) AM_RAM // main ram?
AM_RANGE(0x700000, 0x700007) AM_READ(littlerb_vdp_r) AM_WRITE(littlerb_vdp_w)
AM_RANGE(0x740000, 0x740001) AM_WRITE(littlerb_l_sound_w)
AM_RANGE(0x760000, 0x760001) AM_WRITE(littlerb_r_sound_w)
AM_RANGE(0x780000, 0x780001) AM_WRITENOP // generic outputs
AM_RANGE(0x7c0000, 0x7c0001) AM_READ_PORT("DSW")
AM_RANGE(0x7e0000, 0x7e0001) AM_READ_PORT("P1")
AM_RANGE(0x7e0002, 0x7e0003) AM_READ_PORT("P2")
AM_RANGE(0x700000, 0x700007) AM_READ(littlerb_vdp_r) AM_WRITE(littlerb_vdp_w)
AM_RANGE(0x780000, 0x780001) AM_WRITENOP
ADDRESS_MAP_END
/* guess according to DASM code and checking the gameplay speed, could be different */
static CUSTOM_INPUT( littlerb_frame_step_r )
{
UINT32 ret = field.machine().primary_screen->frame_number();
return (ret) & 7;
}
static INPUT_PORTS_START( littlerb )
PORT_START("DSW") /* 16bit */
@ -367,9 +403,7 @@ static INPUT_PORTS_START( littlerb )
PORT_DIPNAME( 0x1000, 0x1000, "???" )
PORT_DIPSETTING( 0x1000, DEF_STR( Off ) )
PORT_DIPSETTING( 0x0000, DEF_STR( On ) )
PORT_BIT( 0x2000, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x4000, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0x8000, IP_ACTIVE_LOW, IPT_UNUSED )
PORT_BIT( 0xe000, IP_ACTIVE_HIGH, IPT_SPECIAL ) PORT_CUSTOM(littlerb_frame_step_r, NULL)
PORT_START("P2") /* 16bit */
PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2)
@ -442,22 +476,25 @@ static SCREEN_UPDATE_IND16(littlerb)
return 0;
}
static INTERRUPT_GEN( littlerb )
static TIMER_DEVICE_CALLBACK( littlerb_scanline )
{
logerror("IRQ\n");
device_set_input_line(device, 4, HOLD_LINE);
littlerb_state *state = timer.machine().driver_data<littlerb_state>();
int scanline = param;
// logerror("IRQ\n");
if(scanline == 256)
device_set_input_line(state->m_maincpu, 4, HOLD_LINE);
}
static MACHINE_CONFIG_START( littlerb, littlerb_state )
MCFG_CPU_ADD("maincpu", M68000, 12000000)
MCFG_CPU_PROGRAM_MAP(littlerb_main)
MCFG_CPU_VBLANK_INT("screen", littlerb)
MCFG_TIMER_ADD_SCANLINE("scantimer", littlerb_scanline, "screen", 0, 1)
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE(60)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
MCFG_SCREEN_SIZE(512, 256)
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
MCFG_SCREEN_SIZE(512, 262)
MCFG_SCREEN_VISIBLE_AREA(0*8, 320-1, 0*8, 256-1)
MCFG_SCREEN_UPDATE_STATIC(littlerb)