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MSM5232: more options

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This commit is contained in:
tildearrow 2022-10-01 19:47:40 -05:00
parent 76f0cceb55
commit 7b55ba4e77
6 changed files with 290 additions and 91 deletions
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161
src/engine/platform/sound/oki/msm5232.cpp
View file

@ -79,6 +79,18 @@ void msm5232_device::set_capacitors(double cap1, double cap2, double cap3, doubl
m_external_capacity[7] = cap8;
}
void msm5232_device::set_vol_input(double v1, double v2, double v3, double v4, double v5, double v6, double v7, double v8)
{
m_external_input[0] = v1;
m_external_input[1] = v2;
m_external_input[2] = v3;
m_external_input[3] = v4;
m_external_input[4] = v5;
m_external_input[5] = v6;
m_external_input[6] = v7;
m_external_input[7] = v8;
}
/* Default chip clock is 2119040 Hz */
/* At this clock chip generates exactly 440.0 Hz signal on 8' output when pitch data=0x21 */
@ -224,6 +236,7 @@ void msm5232_device::init_voice(int i)
m_voi[i].eg_sect= -1;
m_voi[i].eg = 0.0;
m_voi[i].eg_arm = 0;
m_voi[i].eg_ext = 0;
m_voi[i].pitch = -1.0;
m_voi[i].mute = false;
}
@ -366,6 +379,7 @@ void msm5232_device::write(unsigned int offset, uint8_t data)
if ( (data&0x10) && (m_voi[i].eg_sect == 1) )
m_voi[i].eg_sect = 0;
m_voi[i].eg_arm = data&0x10;
m_voi[i].eg_ext = !(data&0x20);
}
m_EN_out16[0] = (data&1) ? ~0:0;
@ -391,6 +405,7 @@ void msm5232_device::write(unsigned int offset, uint8_t data)
if ( (data&0x10) && (m_voi[i+4].eg_sect == 1) )
m_voi[i+4].eg_sect = 0;
m_voi[i+4].eg_arm = data&0x10;
m_voi[i+4].eg_ext = !(data&0x20);
}
m_EN_out16[1] = (data&1) ? ~0:0;
@ -418,90 +433,94 @@ void msm5232_device::EG_voices_advance()
i = 8;
do
{
switch(voi->eg_sect)
{
case 0: /* attack */
if (voi->eg_ext) {
voi->egvol=m_external_input[8-i]*2048.0;
} else {
switch(voi->eg_sect)
{
case 0: /* attack */
/* capacitor charge */
if (voi->eg < VMAX)
{
voi->counter -= (int)((VMAX - voi->eg) / voi->ar_rate);
if ( voi->counter <= 0 )
{
int n = -voi->counter / samplerate + 1;
voi->counter += n * samplerate;
if ( (voi->eg += n) > VMAX )
voi->eg = VMAX;
}
}
/* capacitor charge */
if (voi->eg < VMAX)
{
voi->counter -= (int)((VMAX - voi->eg) / voi->ar_rate);
if ( voi->counter <= 0 )
{
int n = -voi->counter / samplerate + 1;
voi->counter += n * samplerate;
if ( (voi->eg += n) > VMAX )
voi->eg = VMAX;
}
}
/* when ARM=0, EG switches to decay as soon as cap is charged to VT (EG inversion voltage; about 80% of MAX) */
if (!voi->eg_arm)
{
if(voi->eg >= VMAX * 80/100 )
{
voi->eg_sect = 1;
}
}
else
/* ARM=1 */
{
/* when ARM=1, EG stays at maximum until key off */
}
/* when ARM=0, EG switches to decay as soon as cap is charged to VT (EG inversion voltage; about 80% of MAX) */
if (!voi->eg_arm)
{
if(voi->eg >= VMAX * 80/100 )
{
voi->eg_sect = 1;
}
}
else
/* ARM=1 */
{
/* when ARM=1, EG stays at maximum until key off */
}
voi->egvol = voi->eg / 16; /*32768/16 = 2048 max*/
voi->egvol = voi->eg / 16; /*32768/16 = 2048 max*/
break;
break;
case 1: /* decay */
case 1: /* decay */
/* capacitor discharge */
if (voi->eg > VMIN)
{
voi->counter -= (int)((voi->eg - VMIN) / voi->dr_rate);
if ( voi->counter <= 0 )
{
int n = -voi->counter / samplerate + 1;
voi->counter += n * samplerate;
if ( (voi->eg -= n) < VMIN )
voi->eg = VMIN;
}
}
else /* voi->eg <= VMIN */
{
voi->eg_sect =-1;
}
/* capacitor discharge */
if (voi->eg > VMIN)
{
voi->counter -= (int)((voi->eg - VMIN) / voi->dr_rate);
if ( voi->counter <= 0 )
{
int n = -voi->counter / samplerate + 1;
voi->counter += n * samplerate;
if ( (voi->eg -= n) < VMIN )
voi->eg = VMIN;
}
}
else /* voi->eg <= VMIN */
{
voi->eg_sect =-1;
}
voi->egvol = voi->eg / 16; /*32768/16 = 2048 max*/
voi->egvol = voi->eg / 16; /*32768/16 = 2048 max*/
break;
break;
case 2: /* release */
case 2: /* release */
/* capacitor discharge */
if (voi->eg > VMIN)
{
voi->counter -= (int)((voi->eg - VMIN) / voi->rr_rate);
if ( voi->counter <= 0 )
{
int n = -voi->counter / samplerate + 1;
voi->counter += n * samplerate;
if ( (voi->eg -= n) < VMIN )
voi->eg = VMIN;
}
}
else /* voi->eg <= VMIN */
{
voi->eg_sect =-1;
}
/* capacitor discharge */
if (voi->eg > VMIN)
{
voi->counter -= (int)((voi->eg - VMIN) / voi->rr_rate);
if ( voi->counter <= 0 )
{
int n = -voi->counter / samplerate + 1;
voi->counter += n * samplerate;
if ( (voi->eg -= n) < VMIN )
voi->eg = VMIN;
}
}
else /* voi->eg <= VMIN */
{
voi->eg_sect =-1;
}
voi->egvol = voi->eg / 16; /*32768/16 = 2048 max*/
voi->egvol = voi->eg / 16; /*32768/16 = 2048 max*/
break;
break;
default:
break;
}
default:
break;
}
}
voi++;
i--;

3
src/engine/platform/sound/oki/msm5232.h
View file

@ -15,6 +15,7 @@ public:
msm5232_device(uint32_t clock);
void set_capacitors(double cap1, double cap2, double cap3, double cap4, double cap5, double cap6, double cap7, double cap8);
void set_vol_input(double v1, double v2, double v3, double v4, double v5, double v6, double v7, double v8);
//auto gate() { return m_gate_handler_cb.bind(); }
void write(unsigned int offset, uint8_t data);
@ -52,6 +53,7 @@ private:
int eg;
uint8_t eg_arm; /* attack/release mode */
uint8_t eg_ext; /* inhibit envelope generator */
double ar_rate;
double dr_rate;
@ -90,6 +92,7 @@ private:
uint32_t m_clock;
double m_external_capacity[8]; /* in Farads, eg 0.39e-6 = 0.36 uF (microFarads) */
double m_external_input[8];
std::function<void(int)> m_gate_handler_cb;/* callback called when the GATE output pin changes state */
void init_tables();