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fixed an error with Z80 reset from previous changes

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This commit is contained in:
ekeeke31 2010-06-17 06:31:30 +00:00
parent 3434f89e3b
commit 84a395dbf3
3 changed files with 26 additions and 33 deletions
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35
source/genesis.c
View File

@ -258,18 +258,19 @@ unsigned int gen_bankswitch_r(void)
-----------------------------------------------------------------------*/
void gen_zbusreq_w(unsigned int state, unsigned int cycles)
{
if (state) /* Z80 Bus Requested */
if (state) /* !ZBUSREQ asserted */
{
/* if z80 was running, resynchronize with 68k */
if (zstate == 1)
z80_run(cycles);
/* request Z80 bus */
/* update Z80 bus status */
zstate |= 2;
/* enable 68k access */
/* check if Z80 reset is released */
if (zstate & 1)
{
/* enable 68k access to Z80 bus */
_m68k_memory_map *base = &m68k_memory_map[0xa0];
base->read8 = z80_read_byte;
base->read16 = z80_read_word;
@ -277,13 +278,13 @@ void gen_zbusreq_w(unsigned int state, unsigned int cycles)
base->write16 = z80_write_word;
}
}
else /* Z80 Bus Released */
else /* !ZBUSREQ released */
{
/* if z80 is restarted, resynchronize with 68k */
if (zstate == 3)
mcycles_z80 = cycles;
/* release Z80 bus */
/* update Z80 bus status */
zstate &= 1;
/* disable 68k access */
@ -301,21 +302,19 @@ void gen_zreset_w(unsigned int state, unsigned int cycles)
if (state == (zstate & 1))
return;
if (state) /* !ZRESET inactive */
if (state) /* !ZRESET released */
{
/* if z80 is restarted, resynchronize with 68k */
if (zstate == 0)
if (!zstate)
mcycles_z80 = cycles;
/* reset Z80 */
z80_reset();
/* negate Z80 reset */
/* update Z80 bus status */
zstate |= 1;
/* enable 68k access */
if (zstate & 1)
/* check if Z80 bus has been requested */
if (zstate & 2)
{
/* enable 68k access to Z80 bus */
_m68k_memory_map *base = &m68k_memory_map[0xa0];
base->read8 = z80_read_byte;
base->read16 = z80_read_word;
@ -323,13 +322,17 @@ void gen_zreset_w(unsigned int state, unsigned int cycles)
base->write16 = z80_write_word;
}
}
else /* !ZRESET active */
else /* !ZRESET asserted */
{
/* if z80 was running, resynchronize with 68k */
if (zstate == 1)
z80_run(cycles);
/* assert Z80 reset */
/* reset Z80 & YM2612 */
z80_reset();
fm_reset(cycles);
/* update Z80 bus status */
zstate &= 2;
/* disable 68k access */
@ -340,8 +343,6 @@ void gen_zreset_w(unsigned int state, unsigned int cycles)
base->write16 = m68k_unused_16_w;
}
/* reset YM2612 */
fm_reset(cycles);
}
void gen_zbank_w (unsigned int state)

8
source/sound/sound.c
View File

@ -42,10 +42,10 @@ static inline void fm_update(unsigned int cycles)
fm_cycles_count += cycles;
/* number of samples during period */
uint32 cnt = cycles / fm_cycles_ratio;
unsigned int cnt = cycles / fm_cycles_ratio;
/* remaining cycles */
uint32 remain = cycles % fm_cycles_ratio;
unsigned int remain = cycles % fm_cycles_ratio;
if (remain)
{
/* one sample ahead */
@ -82,10 +82,10 @@ static inline void psg_update(unsigned int cycles)
psg_cycles_count += cycles;
/* number of samples during period */
uint32 cnt = cycles / psg_cycles_ratio;
unsigned int cnt = cycles / psg_cycles_ratio;
/* remaining cycles */
uint32 remain = cycles % psg_cycles_ratio;
unsigned int remain = cycles % psg_cycles_ratio;
if (remain)
{
/* one sample ahead */

14
source/system.c
View File

@ -89,7 +89,7 @@ int audio_update (void)
else
{
/* adjust remaining samples in FM output buffer*/
snd.fm.pos -= (size << 1);
snd.fm.pos -= (size * 2);
#ifdef LOGSOUND
error("%d FM samples remaining\n",(snd.fm.pos - snd.fm.buffer)>>1);
@ -154,8 +154,8 @@ int audio_update (void)
rrp = rr;
/* keep remaining samples for next frame */
memcpy(snd.fm.buffer, fm, (snd.fm.pos - snd.fm.buffer) << 2);
memcpy(snd.psg.buffer, psg, (snd.psg.pos - snd.psg.buffer) << 1);
memcpy(snd.fm.buffer, fm, (snd.fm.pos - snd.fm.buffer) * 4);
memcpy(snd.psg.buffer, psg, (snd.psg.pos - snd.psg.buffer) * 2);
#ifdef LOGSOUND
error("%d samples returned\n\n",size);
@ -191,20 +191,12 @@ int audio_init (int samplerate, float framerate)
#endif
/* SN76489 stream buffers */
#ifndef NGC
snd.psg.buffer = (int16 *) malloc(snd.buffer_size * sizeof(int16));
#else
snd.psg.buffer = (int16 *) memalign(32, snd.buffer_size * sizeof(int16));
#endif
if (!snd.psg.buffer)
return (-1);
/* YM2612 stream buffers */
#ifndef NGC
snd.fm.buffer = (int32 *) malloc(snd.buffer_size * sizeof(int32) * 2);
#else
snd.fm.buffer = (int32 *) memalign(32,snd.buffer_size * sizeof(int32) * 2);
#endif
if (!snd.fm.buffer)
return (-1);