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Part one of untangling sound HW in Little Robin, nw for now

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This commit is contained in:
Angelo Salese 2014-03-31 19:41:52 +00:00
parent 4369aec307
commit 288c1b7018
1 changed files with 19 additions and 19 deletions
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36
src/mame/drivers/littlerb.c
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@ -100,7 +100,8 @@ public:
DECLARE_WRITE16_MEMBER(littlerb_r_sound_w);
UINT8 sound_data_shift();
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_scanline_sound);
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_scanline_unk);
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_sound_cb);
};
@ -229,31 +230,29 @@ static INPUT_PORTS_START( littlerb )
PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_scanline_sound)
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_scanline_unk)
{
int scanline = param;
if((scanline % 2) == 0)
{
UINT8 res;
UINT8 *sample_rom = memregion("samples")->base();
res = sample_rom[m_sound_pointer_l|(m_sound_index_l<<10)|0x40000];
m_dacl->write_signed8(res);
res = sample_rom[m_sound_pointer_r|(m_sound_index_r<<10)|0x00000];
m_dacr->write_signed8(res);
m_sound_pointer_l++;
m_sound_pointer_l&=0x3ff;
m_sound_pointer_r++;
m_sound_pointer_r&=0x3ff;
}
if (scanline == 0) m_soundframe++;
// printf("scanline %d\n", scanline);
}
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_sound_cb)
{
UINT8 res;
UINT8 *sample_rom = memregion("samples")->base();
res = sample_rom[m_sound_pointer_l|(m_sound_index_l<<10)|0x40000];
m_dacl->write_signed8(res);
res = sample_rom[m_sound_pointer_r|(m_sound_index_r<<10)|0x00000];
m_dacr->write_signed8(res);
m_sound_pointer_l++;
m_sound_pointer_l&=0x3ff;
m_sound_pointer_r++;
m_sound_pointer_r&=0x3ff;
}
static MACHINE_CONFIG_START( littlerb, littlerb_state )
MCFG_CPU_ADD("maincpu", M68000, 12000000)
@ -262,7 +261,8 @@ static MACHINE_CONFIG_START( littlerb, littlerb_state )
MCFG_INDER_VIDEO_ADD("inder_vid")
// should probably be done with a timer rather than relying on screen(!)
MCFG_TIMER_DRIVER_ADD_SCANLINE("scantimer", littlerb_state, littlerb_scanline_sound, "inder_vid:inder_screen", 0, 1)
MCFG_TIMER_DRIVER_ADD_SCANLINE("scantimer", littlerb_state, littlerb_scanline_unk, "inder_vid:inder_screen", 0, 1)
MCFG_TIMER_DRIVER_ADD_PERIODIC("sound_timer", littlerb_state, littlerb_sound_cb, attotime::from_hz(7500)) // TODO: not accurate
MCFG_SPEAKER_STANDARD_STEREO("lspeaker","rspeaker")