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not worth mention: fixed snes dsp init procedure

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This commit is contained in:
Fabio Priuli 2010-03-18 10:51:19 +00:00
parent 65fe46408b
commit 03722ff207
1 changed files with 10 additions and 10 deletions
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20
src/mame/audio/snes_snd.c
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@ -1078,7 +1078,7 @@ static WRITE8_DEVICE_HANDLER( snes_dsp_io_w )
if (offset == 0x7c) if (offset == 0x7c)
{ {
/* Writes to register 0x7c (ENDX) works as follows */ /* Writes to register 0x7c (ENDX) clear ALL bits no matter which value is written */
spc700->dsp_regs[offset] = 0; spc700->dsp_regs[offset] = 0;
} }
else else
@ -1177,8 +1177,9 @@ WRITE8_DEVICE_HANDLER( spc_io_w )
break; break;
case 0x2: /* Register address */ case 0x2: /* Register address */
break; break;
case 0x3: /* Register data */ case 0x3: /* Register data - 0x80-0xff is a read-only mirror of 0x00-0x7f */
snes_dsp_io_w(device, spc700->ram[0xf2], data); if (!(spc700->ram[0xf2] & 0x80))
snes_dsp_io_w(device, spc700->ram[0xf2] & 0x7f, data);
break; break;
case 0x4: /* Port 0 */ case 0x4: /* Port 0 */
case 0x5: /* Port 1 */ case 0x5: /* Port 1 */
@ -1309,16 +1310,16 @@ static DEVICE_START( snes_sound )
snes_sound_state *spc700 = get_safe_token(device); snes_sound_state *spc700 = get_safe_token(device);
running_machine *machine = device->machine; running_machine *machine = device->machine;
state_register(device);
spc700->channel = stream_create(device, 0, 2, 32000, 0, snes_sh_update); spc700->channel = stream_create(device, 0, 2, 32000, 0, snes_sh_update);
spc700->ram = auto_alloc_array_clear(device->machine, UINT8, SNES_SPCRAM_SIZE); spc700->ram = auto_alloc_array_clear(device->machine, UINT8, SNES_SPCRAM_SIZE);
state_save_register_device_item_pointer(device, 0, spc700->ram, SNES_SPCRAM_SIZE);
/* default to ROM visible */ /* default to ROM visible */
spc700->ram[0xf1] = 0x80; spc700->ram[0xf1] = 0x80;
/* put IPL image at the top of RAM */
memcpy(spc700->ipl_region, memory_region(machine, "user5"), 64);
/* Initialize the timers */ /* Initialize the timers */
spc700->timer[0] = timer_alloc(machine, snes_spc_timer, spc700); spc700->timer[0] = timer_alloc(machine, snes_spc_timer, spc700);
timer_adjust_periodic(spc700->timer[0], ATTOTIME_IN_HZ(8000), 0, ATTOTIME_IN_HZ(8000)); timer_adjust_periodic(spc700->timer[0], ATTOTIME_IN_HZ(8000), 0, ATTOTIME_IN_HZ(8000));
@ -1329,17 +1330,16 @@ static DEVICE_START( snes_sound )
spc700->timer[2] = timer_alloc(machine, snes_spc_timer, spc700); spc700->timer[2] = timer_alloc(machine, snes_spc_timer, spc700);
timer_adjust_periodic(spc700->timer[2], ATTOTIME_IN_HZ(64000), 2, ATTOTIME_IN_HZ(64000)); timer_adjust_periodic(spc700->timer[2], ATTOTIME_IN_HZ(64000), 2, ATTOTIME_IN_HZ(64000));
timer_enable(spc700->timer[2], 0); timer_enable(spc700->timer[2], 0);
state_register(device);
state_save_register_device_item_pointer(device, 0, spc700->ram, SNES_SPCRAM_SIZE);
} }
static DEVICE_RESET( snes_sound ) static DEVICE_RESET( snes_sound )
{ {
snes_sound_state *spc700 = get_safe_token(device); snes_sound_state *spc700 = get_safe_token(device);
running_machine *machine = device->machine;
int ii; int ii;
/* put IPL image at the top of RAM */
memcpy(spc700->ipl_region, memory_region(machine, "user5"), 64);
/* Sort out the ports */ /* Sort out the ports */
for (ii = 0; ii < 4; ii++) for (ii = 0; ii < 4; ii++)
{ {