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Untangled Little Robin sound HW from video timings [Angelo Salese]

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This commit is contained in:
Angelo Salese 2014-03-31 20:03:05 +00:00
parent 5a9fe25e7d
commit 3066f1e2c4
1 changed files with 7 additions and 10 deletions
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17
src/mame/drivers/littlerb.c
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@ -100,7 +100,7 @@ public:
DECLARE_WRITE16_MEMBER(littlerb_r_sound_w);
UINT8 sound_data_shift();
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_scanline_unk);
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_sound_step_cb);
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_sound_cb);
};
@ -230,14 +230,6 @@ static INPUT_PORTS_START( littlerb )
PORT_BIT( 0xff00, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_scanline_unk)
{
int scanline = param;
if (scanline == 0) m_soundframe++;
// printf("scanline %d\n", scanline);
}
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_sound_cb)
{
@ -254,6 +246,11 @@ TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_sound_cb)
m_sound_pointer_r&=0x3ff;
}
TIMER_DEVICE_CALLBACK_MEMBER(littlerb_state::littlerb_sound_step_cb)
{
m_soundframe++;
}
static MACHINE_CONFIG_START( littlerb, littlerb_state )
MCFG_CPU_ADD("maincpu", M68000, 12000000)
MCFG_CPU_PROGRAM_MAP(littlerb_main)
@ -261,7 +258,7 @@ 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_unk, "inder_vid:inder_screen", 0, 1)
MCFG_TIMER_DRIVER_ADD_PERIODIC("step_timer", littlerb_state, littlerb_sound_step_cb, attotime::from_hz(7500/150)) // TODO: not accurate
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")