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(MESS) pv1000.c: modernized the sound device and added save state support. [Fabio Priuli]

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This commit is contained in:
Fabio Priuli 2013-05-28 18:04:54 +00:00
parent 27ed7ef59b
commit e3c1eb7265
1 changed files with 107 additions and 72 deletions
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179
src/mess/drivers/pv1000.c
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@ -8,12 +8,16 @@
#include "cpu/z80/z80.h"
#include "imagedev/cartslot.h"
// PV-1000 Sound device
class pv1000_sound_device : public device_t,
public device_sound_interface
{
public:
pv1000_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_WRITE8_MEMBER(voice_w);
protected:
// device-level overrides
virtual void device_config_complete();
@ -21,8 +25,18 @@ protected:
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
private:
// internal state
struct
{
UINT32 count;
UINT16 period;
UINT8 val;
} m_voice[4];
sound_stream *m_sh_channel;
};
extern const device_type PV1000;
@ -30,8 +44,8 @@ extern const device_type PV1000;
const device_type PV1000 = &device_creator<pv1000_sound_device>;
pv1000_sound_device::pv1000_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, PV1000, "NEC D65010G031", tag, owner, clock),
device_sound_interface(mconfig, *this)
: device_t(mconfig, PV1000, "NEC D65010G031", tag, owner, clock),
device_sound_interface(mconfig, *this)
{
}
@ -48,23 +62,78 @@ void pv1000_sound_device::device_config_complete()
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
static DEVICE_START( pv1000_sound );
void pv1000_sound_device::device_start()
{
DEVICE_START_NAME( pv1000_sound )(this);
m_sh_channel = machine().sound().stream_alloc(*this, 0, 1, clock() / 1024, this);
save_item(NAME(m_voice[0].count));
save_item(NAME(m_voice[0].period));
save_item(NAME(m_voice[0].val));
save_item(NAME(m_voice[1].count));
save_item(NAME(m_voice[1].period));
save_item(NAME(m_voice[1].val));
save_item(NAME(m_voice[2].count));
save_item(NAME(m_voice[2].period));
save_item(NAME(m_voice[2].val));
// are these ever used?
save_item(NAME(m_voice[3].count));
save_item(NAME(m_voice[3].period));
save_item(NAME(m_voice[3].val));
}
WRITE8_MEMBER(pv1000_sound_device::voice_w)
{
offset &= 0x03;
m_voice[offset].period = data;
}
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
/*
plgDavid's audio implementation/analysis notes:
Sound appears to be 3 50/50 pulse voices made by cutting the main clock by 1024,
then by the value of the 6bit period registers.
This creates a surprisingly accurate pitch range.
Note: the register periods are inverted.
*/
void pv1000_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
// should never get here
fatalerror("sound_stream_update called; not applicable to legacy sound devices\n");
stream_sample_t *buffer = outputs[0];
while (samples > 0)
{
*buffer=0;
for (int i = 0; i < 3; i++)
{
UINT32 per = (0x3f - (m_voice[i].period & 0x3f));
if (per != 0) //OFF!
*buffer += m_voice[i].val * 8192;
m_voice[i].count++;
if (m_voice[i].count >= per)
{
m_voice[i].count = 0;
m_voice[i].val = !m_voice[i].val;
}
}
buffer++;
samples--;
}
}
// PV-1000 System
class pv1000_state : public driver_device
@ -73,6 +142,7 @@ public:
pv1000_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_sound(*this, "pv1000_sound"),
m_screen(*this, "screen"),
m_p_videoram(*this, "p_videoram")
{ }
@ -82,14 +152,7 @@ public:
DECLARE_WRITE8_MEMBER(pv1000_gfxram_w);
UINT8 m_io_regs[8];
UINT8 m_fd_data;
struct
{
UINT32 count;
UINT16 period;
UINT8 val;
} m_voice[4];
sound_stream *m_sh_channel;
emu_timer *m_irq_on_timer;
emu_timer *m_irq_off_timer;
UINT8 m_pcg_bank;
@ -97,7 +160,11 @@ public:
UINT8 m_fd_buffer_flag;
UINT8 m_border_col;
UINT8 * m_gfxram;
void pv1000_postload();
required_device<cpu_device> m_maincpu;
required_device<pv1000_sound_device> m_sound;
required_device<screen_device> m_screen;
required_shared_ptr<UINT8> m_p_videoram;
virtual void machine_start();
@ -134,13 +201,13 @@ WRITE8_MEMBER( pv1000_state::pv1000_gfxram_w )
WRITE8_MEMBER( pv1000_state::pv1000_io_w )
{
switch ( offset )
switch (offset)
{
case 0x00:
case 0x01:
case 0x02:
//logerror("pv1000_io_w offset=%02x, data=%02x (%03d)\n", offset, data , data);
m_voice[offset].period = data;
m_sound->voice_w(space, offset, data);
break;
case 0x03:
@ -181,13 +248,12 @@ READ8_MEMBER( pv1000_state::pv1000_io_r )
break;
case 0x05:
static const char *const joynames[] = { "IN0", "IN1", "IN2", "IN3" };
int i;
data = 0;
for(i=0;i<4;i++)
for (int i = 0; i < 4; i++)
{
if(m_io_regs[5] & 1 << i)
if (m_io_regs[5] & 1 << i)
{
data |= ioport(joynames[i])->read();
m_fd_data &= ~(1 << i);
@ -231,10 +297,8 @@ INPUT_PORTS_END
void pv1000_state::palette_init()
{
int i;
for(i=0;i<8;i++)
palette_set_color_rgb( machine(), i, pal1bit(i >> 2), pal1bit(i >> 1), pal1bit(i >> 0));
for (int i = 0; i < 8; i++)
palette_set_color_rgb(machine(), i, pal1bit(i >> 2), pal1bit(i >> 1), pal1bit(i >> 0));
}
@ -304,54 +368,6 @@ UINT32 pv1000_state::screen_update_pv1000(screen_device &screen, bitmap_ind16 &b
}
/*
plgDavid's audio implementation/analysis notes:
Sound appears to be 3 50/50 pulse voices made by cutting the main clock by 1024,
then by the value of the 6bit period registers.
This creates a surprisingly accurate pitch range.
Note: the register periods are inverted.
*/
static STREAM_UPDATE( pv1000_sound_update )
{
pv1000_state *state = device->machine().driver_data<pv1000_state>();
stream_sample_t *buffer = outputs[0];
while ( samples > 0 )
{
*buffer=0;
for (size_t i=0;i<3;i++)
{
UINT32 per = (0x3F-(state->m_voice[i].period & 0x3f));
if( per != 0)//OFF!
*buffer += state->m_voice[i].val * 8192;
state->m_voice[i].count++;
if (state->m_voice[i].count >= per)
{
state->m_voice[i].count = 0;
state->m_voice[i].val = !state->m_voice[i].val;
}
}
buffer++;
samples--;
}
}
static DEVICE_START( pv1000_sound )
{
pv1000_state *state = device->machine().driver_data<pv1000_state>();
state->m_sh_channel = device->machine().sound().stream_alloc(*device, 0, 1, device->clock()/1024, 0, pv1000_sound_update );
}
/* Interrupt is triggering 16 times during vblank. */
/* we have chosen to trigger on scanlines 195, 199, 203, 207, 211, 215, 219, 223, 227, 231, 235, 239, 243, 247, 251, 255 */
@ -382,10 +398,29 @@ TIMER_CALLBACK_MEMBER(pv1000_state::d65010_irq_off_cb)
}
void pv1000_state::pv1000_postload()
{
// restore GFX ram
for (int i = 0; i < 0x400; i++)
pv1000_gfxram_w(m_maincpu->space(AS_PROGRAM), i, m_gfxram[i]);
}
void pv1000_state::machine_start()
{
m_irq_on_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(pv1000_state::d65010_irq_on_cb),this));
m_irq_off_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(pv1000_state::d65010_irq_off_cb),this));
m_gfxram = memregion("gfxram")->base();
save_pointer(NAME(m_gfxram), 0x400);
save_item(NAME(m_io_regs));
save_item(NAME(m_fd_data));
save_item(NAME(m_pcg_bank));
save_item(NAME(m_force_pattern));
save_item(NAME(m_fd_buffer_flag));
save_item(NAME(m_border_col));
machine().save().register_postload(save_prepost_delegate(FUNC(pv1000_state::pv1000_postload), this));
}
@ -393,8 +428,8 @@ void pv1000_state::machine_reset()
{
m_io_regs[5] = 0;
m_fd_data = 0;
m_irq_on_timer->adjust( m_screen->time_until_pos(195, 0 ) );
m_irq_off_timer->adjust( attotime::never );
m_irq_on_timer->adjust(m_screen->time_until_pos(195, 0));
m_irq_off_timer->adjust(attotime::never);
}