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mindset: Fix sound [O. Galibert]

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This commit is contained in:
Olivier Galibert 2019-08-21 12:22:22 +02:00
parent 8033bf9f7c
commit 37d1ac2d83
1 changed files with 22 additions and 6 deletions
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28
src/mame/drivers/mindset.cpp
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@ -8,6 +8,7 @@
#include "machine/upd765.h"
#include "formats/pc_dsk.h"
#include "sound/dac.h"
#include "sound/volt_reg.h"
#include "screen.h"
#include "speaker.h"
@ -45,7 +46,7 @@ protected:
u32 m_palette[16];
bool m_genlock[16];
u16 m_dispctrl, m_screenpos, m_intpos, m_intaddr, m_fdc_dma_count;
u8 m_kbd_p1, m_kbd_p2, m_borderidx;
u8 m_kbd_p1, m_kbd_p2, m_borderidx, m_snd_p1, m_snd_p2;
u8 m_mouse_last_read[2], m_mouse_counter[2];
bool m_fdc_intext, m_fdc_int, m_fdc_drq, m_trap_int, m_trap_drq;
@ -108,6 +109,7 @@ protected:
template<int floppy> void floppy_led_cb(floppy_image_device *, int state);
u16 keyscan();
void update_dac();
u32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
@ -185,6 +187,8 @@ void mindset_state::machine_start()
save_item(NAME(m_borderidx));
save_item(NAME(m_mouse_last_read));
save_item(NAME(m_mouse_counter));
save_item(NAME(m_snd_p1));
save_item(NAME(m_snd_p2));
}
void mindset_state::machine_reset()
@ -198,6 +202,9 @@ void mindset_state::machine_reset()
m_kbd_p1 = m_kbd_p2 = m_borderidx = 0;
memset(m_mouse_last_read, 0, sizeof(m_mouse_last_read));
memset(m_mouse_counter, 0, sizeof(m_mouse_counter));
m_snd_p1 = 0x80;
m_snd_p2 = 0;
m_dac->write(0x80);
}
int mindset_state::sys_t0_r()
@ -262,16 +269,22 @@ int mindset_state::kbd_t1_r()
return keyscan() & 0x100;
}
void mindset_state::update_dac()
{
// The p1 dac has the waveform (idle at 0x80), while the p2 one is used for the global volume (mute at 0x00, max at 0xff)
m_dac->write((s8(m_snd_p1-0x80)*m_snd_p2/255 + 0x80) & 0xff);
}
void mindset_state::snd_p1_w(u8 data)
{
m_dac->write(data);
if(data != 0x80)
logerror("%02x\n", data);
m_snd_p1 = data;
update_dac();
}
void mindset_state::snd_p2_w(u8 data)
{
// logerror("snd p2 %02x\n", data);
m_snd_p2 = data;
update_dac();
}
u16 mindset_state::keyscan()
@ -1031,7 +1044,10 @@ void mindset_state::mindset(machine_config &config)
FLOPPY_CONNECTOR(config, m_fdco[1], pc_dd_floppies, "525dd", mindset_state::floppy_formats);
SPEAKER(config, "lspeaker").front_left();
DAC_8BIT_R2R(config, m_dac, 0).add_route(ALL_OUTPUTS, "lspeaker", 1);
DAC_8BIT_R2R(config, m_dac, 0).add_route(ALL_OUTPUTS, "lspeaker", 0.5);
voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
vref.add_route(0, m_dac, 1.0, DAC_VREF_POS_INPUT);
vref.add_route(0, m_dac, -1.0, DAC_VREF_NEG_INPUT);
}
static INPUT_PORTS_START(mindset)