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Added polling hooks for SP0250 DRQ line. The callback is now optional.

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If not provided, then the kick timer is not used.
This commit is contained in:
Aaron Giles 2008-12-30 22:02:10 +00:00
parent 3d7b496183
commit 951bb250e5
2 changed files with 22 additions and 5 deletions
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26
src/emu/sound/sp0250.c
View File

@ -20,6 +20,7 @@
#include "sndintrf.h"
#include "streams.h"
#include "cpuintrf.h"
#include "cpuexec.h"
#include "sp0250.h"
/*
@ -106,7 +107,8 @@ static void sp0250_load_values(struct sp0250 *sp)
sp->filter[5].B = sp0250_gc(sp->fifo[13]);
sp->filter[5].F = sp0250_gc(sp->fifo[14]);
sp->fifo_pos = 0;
sp->drq(ASSERT_LINE);
if (sp->drq != NULL)
sp->drq(ASSERT_LINE);
sp->pcount = 0;
sp->rcount = 0;
@ -198,9 +200,12 @@ static SND_START( sp0250 )
sp = auto_malloc(sizeof(*sp));
memset(sp, 0, sizeof(*sp));
sp->RNG = 1;
sp->drq = intf->drq_callback;
sp->drq(ASSERT_LINE);
timer_pulse(device->machine, attotime_mul(ATTOTIME_IN_HZ(clock), CLOCK_DIVIDER), sp, 0, sp0250_timer_tick);
sp->drq = (intf != NULL) ? intf->drq_callback : NULL;
if (sp->drq != NULL)
{
sp->drq(ASSERT_LINE);
timer_pulse(device->machine, attotime_mul(ATTOTIME_IN_HZ(clock), CLOCK_DIVIDER), sp, 0, sp0250_timer_tick);
}
sp->stream = stream_create(device, 0, 1, clock / CLOCK_DIVIDER, sp, sp0250_update);
@ -211,12 +216,23 @@ static SND_START( sp0250 )
WRITE8_HANDLER( sp0250_w )
{
struct sp0250 *sp = sndti_token(SOUND_SP0250, 0);
stream_update(sp->stream);
if (sp->fifo_pos != 15)
{
sp->fifo[sp->fifo_pos++] = data;
if (sp->fifo_pos == 15)
if (sp->fifo_pos == 15 && sp->drq != NULL)
sp->drq(CLEAR_LINE);
}
else
logerror("%s: overflow SP0250 FIFO\n", cpuexec_describe_context(space->machine));
}
UINT8 sp0250_drq_r(void)
{
struct sp0250 *sp = sndti_token(SOUND_SP0250, 0);
stream_update(sp->stream);
return (sp->fifo_pos == 15) ? CLEAR_LINE : ASSERT_LINE;
}

1
src/emu/sound/sp0250.h
View File

@ -8,6 +8,7 @@ struct sp0250_interface {
};
WRITE8_HANDLER( sp0250_w );
UINT8 sp0250_drq_r(void);
SND_GET_INFO( sp0250 );