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vrc6.cpp : Updates (#4819)

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* vrc6.cpp : Updates
Implement master frequency register, Fix frequency / square duty behaviors, Use shorter type values, Reduce unnecessary lines
device/bus/nes/konami.cpp : Fix vrc6 sound volume, Remove outdated comment

* vrc6.cpp : Fix regression
This commit is contained in:
cam900 2019-03-30 06:50:57 +09:00 committed by ajrhacker
parent 8b08ad2ce6
commit 6dbd636a80
3 changed files with 55 additions and 60 deletions
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4
src/devices/bus/nes/konami.cpp
View File

@ -560,8 +560,6 @@ void nes_konami_vrc4_device::write_h(offs_t offset, uint8_t data)
In MESS: Supported. It also uses konami_irq (there are IRQ
issues though: see Akumajou Densetsu intro).
TODO: Add sound capabilities support!
-------------------------------------------------*/
void nes_konami_vrc6_device::write_h(offs_t offset, uint8_t data)
@ -644,7 +642,7 @@ void nes_konami_vrc6_device::device_add_mconfig(machine_config &config)
// TODO: this is not how VRC6 clock signaling works!
// The board uses the CLK pin in reality, not hardcoded NTSC values!
VRC6(config, m_vrc6snd, XTAL(21'477'272)/12).add_route(ALL_OUTPUTS, "addon", 0.5);
VRC6(config, m_vrc6snd, XTAL(21'477'272)/12).add_route(ALL_OUTPUTS, "addon", 1.0);
}
/*-------------------------------------------------

97
src/devices/sound/vrc6.cpp
View File

@ -16,8 +16,6 @@
#include "emu.h"
#include "vrc6.h"
#define DISABLE_VRC6_SOUND // not ready yet
// device type definition
DEFINE_DEVICE_TYPE(VRC6, vrc6snd_device, "vrc6snd", "Konami VRC6 (Sound)")
@ -29,10 +27,10 @@ DEFINE_DEVICE_TYPE(VRC6, vrc6snd_device, "vrc6snd", "Konami VRC6 (Sound)")
// vrc6snd_device - constructor
//-------------------------------------------------
vrc6snd_device::vrc6snd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
vrc6snd_device::vrc6snd_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, VRC6, tag, owner, clock)
, device_sound_interface(mconfig, *this)
, m_freqctrl(0), m_pulsectrl{ 0, 0 }, m_sawrate(0)
, m_freqctrl(0), m_pulsectrl{ 0, 0 }, m_sawrate(0), m_master_freq(0)
, m_pulsefrql{ 0, 0 }, m_pulsefrqh{ 0, 0 }, m_pulseduty{ 0, 0 }
, m_sawfrql(0), m_sawfrqh(0), m_sawclock(0), m_sawaccum(0)
, m_ticks{ 0, 0, 0 }
@ -55,10 +53,12 @@ void vrc6snd_device::device_start()
m_ticks[0] = m_ticks[1] = m_ticks[2] = 0;
m_output[0] = m_output[1] = m_output[2] = 0;
m_pulseduty[0] = m_pulseduty[1] = 15;
m_master_freq = 0;
save_item(NAME(m_freqctrl));
save_item(NAME(m_pulsectrl));
save_item(NAME(m_sawrate));
save_item(NAME(m_master_freq));
save_item(NAME(m_sawaccum));
save_item(NAME(m_pulsefrql));
save_item(NAME(m_pulsefrqh));
@ -85,6 +85,7 @@ void vrc6snd_device::device_reset()
m_output[0] = m_output[1] = m_output[2] = 0;
m_pulseduty[0] = m_pulseduty[1] = 15;
m_pulsefrqh[0] = m_pulsefrqh[1] = m_sawfrqh = 0;
m_master_freq = 0;
}
//-------------------------------------------------
@ -94,27 +95,22 @@ void vrc6snd_device::device_reset()
void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
stream_sample_t *out = outputs[0];
int16_t tmp;
int i;
std::fill_n(&outputs[0][0], samples, 0);
// check global halt bit
if (m_freqctrl & 1)
{
return;
}
for (i = 0; i < samples; i++)
for (int i = 0; i < samples; i++)
{
// update pulse1
if (m_pulsefrqh[0] & 0x80)
{
m_ticks[0]--;
if (m_ticks[0] == 0)
{
m_ticks[0] = m_pulsefrql[0] | (m_pulsefrqh[0] & 0xf)<<4;
m_ticks[0] = (m_pulsefrql[0] | ((m_pulsefrqh[0] & 0xf) << 8)) >> m_master_freq;
m_pulseduty[0]--;
m_pulseduty[0] = (m_pulseduty[0] - 1) & 0xf;
if (m_pulsectrl[0] & 0x80)
{
m_output[0] = m_pulsectrl[0] & 0xf;
@ -130,12 +126,9 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
m_output[0] = 0;
}
}
if (m_pulseduty[0] == 0)
{
m_pulseduty[0] = 15;
}
}
else
m_ticks[0]--;
}
else
{
@ -145,12 +138,11 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
// update pulse2
if (m_pulsefrqh[1] & 0x80)
{
m_ticks[1]--;
if (m_ticks[1] == 0)
{
m_ticks[1] = m_pulsefrql[1] | (m_pulsefrqh[1] & 0xf)<<4;
m_ticks[1] = (m_pulsefrql[1] | ((m_pulsefrqh[1] & 0xf) << 8)) >> m_master_freq;
m_pulseduty[1]--;
m_pulseduty[1] = (m_pulseduty[1] - 1) & 0xf;
if (m_pulsectrl[1] & 0x80)
{
m_output[1] = m_pulsectrl[1] & 0xf;
@ -166,12 +158,9 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
m_output[1] = 0;
}
}
if (m_pulseduty[1] == 0)
{
m_pulseduty[1] = 15;
}
}
else
m_ticks[1]--;
}
else
{
@ -181,10 +170,9 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
// update saw
if (m_sawfrqh & 0x80)
{
m_ticks[2]--;
if (m_ticks[2] == 0)
{
m_ticks[2] = m_sawfrql | (m_sawfrqh & 0xf)<<4;
m_ticks[2] = (m_sawfrql | ((m_sawfrqh & 0xf) << 8)) >> m_master_freq;
// only update on even steps
if ((m_sawclock > 0) && (!(m_sawclock & 1)))
@ -200,6 +188,8 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
m_output[2] = 0;
}
}
else
m_ticks[2]--;
}
else
{
@ -207,10 +197,10 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
}
// sum 2 4-bit pulses, 1 5-bit saw = unsigned 6 bit output
tmp = (int16_t)(uint8_t)(m_output[0] + m_output[1] + m_output[2]);
s16 tmp = (s16)(u8)(m_output[0] + m_output[1] + m_output[2]);
tmp <<= 8;
out[i] = tmp;
outputs[0][i] = tmp;
}
}
@ -218,7 +208,7 @@ void vrc6snd_device::sound_stream_update(sound_stream &stream, stream_sample_t *
// write - write to the chip's registers
//---------------------------------------
void vrc6snd_device::write(offs_t offset, uint8_t data)
void vrc6snd_device::write(offs_t offset, u8 data)
{
switch (offset >> 8)
{
@ -232,28 +222,43 @@ void vrc6snd_device::write(offs_t offset, uint8_t data)
case 1:
m_pulsefrql[0] = data;
if (!(m_pulsefrqh[1] & 0x80))
if (!(m_pulsefrqh[0] & 0x80))
{
m_ticks[0] &= ~0xff;
m_ticks[0] |= m_pulsefrql[0];
m_ticks[0] = (m_pulsefrql[0] | ((m_pulsefrqh[0] & 0xf) << 8)) >> m_master_freq;
}
break;
case 2:
#ifndef DISABLE_VRC6_SOUND
m_pulsefrqh[0] = data;
// if disabling channel, reset phase
if (!(data & 0x80))
{
m_pulseduty[0] = 15;
m_ticks[0] &= 0xff;
m_ticks[0] |= (m_pulsefrqh[0] & 0xf)<<4;
m_ticks[0] = (m_pulsefrql[0] | ((m_pulsefrqh[0] & 0xf) << 8)) >> m_master_freq;
}
#endif
break;
case 3:
m_freqctrl = data;
if (m_freqctrl & 4)
m_master_freq = 0x8;
else if (m_freqctrl & 2)
m_master_freq = 0x4;
else
m_master_freq = 0;
if (!(m_pulsefrqh[0] & 0x80))
{
m_ticks[0] = (m_pulsefrql[0] | ((m_pulsefrqh[0] & 0xf) << 8)) >> m_master_freq;
}
if (!(m_pulsefrqh[1] & 0x80))
{
m_ticks[1] = (m_pulsefrql[1] | ((m_pulsefrqh[1] & 0xf) << 8)) >> m_master_freq;
}
if (!(m_sawfrqh & 0x80))
{
m_ticks[2] = (m_sawfrql | ((m_sawfrqh & 0xf) << 8)) >> m_master_freq;
}
break;
}
break;
@ -270,22 +275,18 @@ void vrc6snd_device::write(offs_t offset, uint8_t data)
m_pulsefrql[1] = data;
if (!(m_pulsefrqh[1] & 0x80))
{
m_ticks[1] &= ~0xff;
m_ticks[1] |= m_pulsefrql[1];
m_ticks[1] = (m_pulsefrql[1] | ((m_pulsefrqh[1] & 0xf) << 8)) >> m_master_freq;
}
break;
case 2:
#ifndef DISABLE_VRC6_SOUND
m_pulsefrqh[1] = data;
// if disabling channel, reset phase
if (!(data & 0x80))
{
m_pulseduty[1] = 15;
m_ticks[1] &= 0xff;
m_ticks[1] |= (m_pulsefrqh[1] & 0xf)<<4;
m_ticks[1] = (m_pulsefrql[1] | ((m_pulsefrqh[1] & 0xf) << 8)) >> m_master_freq;
}
#endif
break;
}
break;
@ -302,22 +303,18 @@ void vrc6snd_device::write(offs_t offset, uint8_t data)
m_sawfrql = data;
if (!(m_sawfrqh & 0x80))
{
m_ticks[2] &= ~0xff;
m_ticks[2] |= m_sawfrql;
m_ticks[2] = (m_sawfrql | ((m_sawfrqh & 0xf) << 8)) >> m_master_freq;
}
break;
case 2:
#ifndef DISABLE_VRC6_SOUND
m_sawfrqh = data;
// if disabling channel, reset phase
if (!(data & 0x80))
{
m_sawaccum = 0;
m_ticks[2] &= 0xff;
m_ticks[2] |= (m_sawfrqh & 0xf)<<4;
m_ticks[2] = (m_sawfrql | ((m_sawfrqh & 0xf) << 8)) >> m_master_freq;
}
#endif
break;
}
break;

14
src/devices/sound/vrc6.h
View File

@ -22,9 +22,9 @@ class vrc6snd_device : public device_t, public device_sound_interface
{
public:
// construction/destruction
vrc6snd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
vrc6snd_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
void write(offs_t offset, uint8_t data);
void write(offs_t offset, u8 data);
protected:
// device-level overrides
@ -34,11 +34,11 @@ protected:
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
private:
uint8_t m_freqctrl, m_pulsectrl[2], m_sawrate;
uint8_t m_pulsefrql[2], m_pulsefrqh[2], m_pulseduty[2];
uint8_t m_sawfrql, m_sawfrqh, m_sawclock, m_sawaccum;
uint16_t m_ticks[3];
uint8_t m_output[3];
u8 m_freqctrl, m_pulsectrl[2], m_sawrate, m_master_freq;
u8 m_pulsefrql[2], m_pulsefrqh[2], m_pulseduty[2];
u8 m_sawfrql, m_sawfrqh, m_sawclock, m_sawaccum;
u16 m_ticks[3];
u8 m_output[3];
sound_stream *m_stream;
};