[wrap]
/************************************************************************
*
* MAME - Discrete sound system emulation library
*
* Written by Keith Wilkins (mame@esplexo.co.uk)
*
* (c) K.Wilkins 2000
* (c) D.Renaud 2003-2004
*
************************************************************************
*
* DST_ADDDER - Multichannel adder
* DST_CLAMP - Simple signal clamping circuit
* DST_COMP_ADDER - Selectable parallel component circuit
* DST_DAC_R1 - R1 Ladder DAC with cap filtering
* DST_DIODE_MIX - Diode mixer
* DST_DIVIDE - Division function
* DST_GAIN - Gain Factor
* DST_INTEGRATE - Integration circuits
* DST_LOGIC_INV - Logic level invertor
* DST_LOGIC_AND - Logic AND gate 4 input
* DST_LOGIC_NAND - Logic NAND gate 4 input
* DST_LOGIC_OR - Logic OR gate 4 input
* DST_LOGIC_NOR - Logic NOR gate 4 input
* DST_LOGIC_XOR - Logic XOR gate 2 input
* DST_LOGIC_NXOR - Logic NXOR gate 2 input
* DST_LOGIC_DFF - Logic D-type flip/flop
* DST_LOGIC_JKFF - Logic JK-type flip/flop
* DST_LOOKUP_TABLE - Return value from lookup table
* DST_MIXER - Final Mixer Stage
* DST_MULTIPLEX - 1 of x Multiplexer/switch
* DST_ONESHOT - One shot pulse generator
* DST_RAMP - Ramp up/down
* DST_SAMPHOLD - Sample & Hold Implementation
* DST_SWITCH - Switch implementation
* DST_ASWITCH - Analog switch
* DST_TRANSFORM - Multiple math functions
* DST_OP_AMP - Op Amp circuits
* DST_OP_AMP_1SHT - Op Amp One Shot
* DST_TVCA_OP_AMP - Triggered op amp voltage controlled amplifier
*
************************************************************************/
#include <float.h>
struct dst_comp_adder_context
{
double total[256];
};
struct dst_dac_r1_context
{
double i_bias; /* current of the bias circuit */
double exponent; /* smoothing curve */
double r_total; /* all resistors in parallel */
int last_data;
};
struct dst_diode_mix__context
{
int size;
double v_junction[8];
};
struct dst_flipflop_context
{
int last_clk;
};
struct dst_integrate_context
{
double change;
double v_max_in; /* v1 - norton VBE */
double v_max_in_d; /* v1 - norton VBE - diode drop */
double v_max_out;
};
#define DISC_MIXER_MAX_INPS 8
struct dst_mixer_context
{
int type;
int size;
int r_node_bit_flag;
int c_bit_flag;
double r_total;
double *r_node[DISC_MIXER_MAX_INPS]; /* Either pointer to resistance node output OR NULL */
double r_last[DISC_MIXER_MAX_INPS];
double exponent_rc[DISC_MIXER_MAX_INPS]; /* For high pass filtering cause by cIn */
double v_cap[DISC_MIXER_MAX_INPS]; /* cap voltage of each input */
double exponent_c_f; /* Low pass on mixed inputs */
double exponent_c_amp; /* Final high pass caused by out cap and amp input impedance */
double v_cap_f; /* cap voltage of cF */
double v_cap_amp; /* cap voltage of cAmp */
double gain; /* used for DISC_MIXER_IS_OP_AMP_WITH_RI */
};
struct dst_oneshot_context
{
double countdown;
int state;
int last_trig;
};
struct dss_ramp_context
{
double step;
int dir; /* 1 if End is higher then Start */
int last_en; /* Keep track of the last enable value */
};
struct dst_samphold_context
{
double last_input;
int clocktype;
};
struct dst_size_context
{
int size;
};
struct dst_op_amp_context
{
UINT8 has_cap;
UINT8 has_r1;
UINT8 has_r4;
double v_max;
double i_fixed;
double v_cap;
double exponent;
};
struct dst_op_amp_1sht_context
{
double i_fixed;
double v_max;
double r34ratio;
double v_cap1;
double v_cap2;
double exponent1c;
double exponent1d;
double exponent2;
};
struct dst_tvca_op_amp_context
{
double v_out_max; /* Maximum output voltage */
double v_trig[2]; /* Voltage used to charge cap1 based on function F3 */
double v_trig2; /* Voltage used to charge cap2 */
double v_trig3; /* Voltage used to charge cap3 */
double i_fixed; /* Fixed current going into - input */
double exponent_c[2]; /* Charge exponents based on function F3 */
double exponent_d[2]; /* Discharge exponents based on function F3 */
double exponent2[2]; /* Discharge/charge exponents based on function F4 */
double exponent3[2]; /* Discharge/charge exponents based on function F5 */
double v_cap1; /* charge on cap c1 */
double v_cap2; /* charge on cap c2 */
double v_cap3; /* charge on cap c3 */
double r67; /* = r6 + r7 (for easy use later) */
};
/************************************************************************
*
* DST_ADDER - This is a 4 channel input adder with enable function
*
* input[0] - Enable input value
* input[1] - Channel0 input value
* input[2] - Channel1 input value
* input[3] - Channel2 input value
* input[4] - Channel3 input value
*
************************************************************************/
#define DST_ADDER__ENABLE (*(node->input[0]))
#define DST_ADDER__IN0 (*(node->input[1]))
#define DST_ADDER__IN1 (*(node->input[2]))
#define DST_ADDER__IN2 (*(node->input[3]))
#define DST_ADDER__IN3 (*(node->input[4]))
static DISCRETE_STEP(dst_adder)
{
if(DST_ADDER__ENABLE)
{
node->output[0] = DST_ADDER__IN0 + DST_ADDER__IN1 + DST_ADDER__IN2 + DST_ADDER__IN3;
}
else
{
node->output[0]=0;
}
}
/************************************************************************
*
* DST_COMP_ADDER - Selectable parallel component adder
*
* input[0] - Bit Select
*
* Also passed discrete_comp_adder_table structure
*
* Mar 2004, D Renaud.
************************************************************************/
#define DST_COMP_ADDER__SELECT (*(node->input[0]))
static DISCRETE_STEP(dst_comp_adder)
{
struct dst_comp_adder_context *context = node->context;
int select;
select = (int)DST_COMP_ADDER__SELECT;
assert(select < 256);
node->output[0] = context->total[select];
}
static DISCRETE_RESET(dst_comp_adder)
{
const discrete_comp_adder_table *info = node->custom;
struct dst_comp_adder_context *context = node->context;
int i, bit;
int length = 1 << info->length;
assert(length <= 256);
/* pre-calculate all possible values to speed up step rooutine */
for(i = 0; i < length; i++)
{
switch (info->type)
{
case DISC_COMP_P_CAPACITOR:
context->total[i] = info->cDefault;
for(bit = 0; bit < info->length; bit++)
{
if (i & (1 << bit)) context->total[i] += info->c[bit];
}
break;
case DISC_COMP_P_RESISTOR:
context->total[i] = (info->cDefault != 0) ? 1.0 / info->cDefault : 0;
for(bit = 0; bit < info->length; bit++)
{
if ((i & (1 << bit)) && (info->c[bit] != 0)) context->total[i] += 1.0 / info->c[bit];
}
if (context->total[i] != 0) context->total[i] = 1.0 / context->total[i];
break;
}
}
node->output[0] = context->total[0];
}
/************************************************************************
*
* DST_CLAMP - Simple signal clamping circuit
*
* input[0] - Enable ramp
* input[1] - Input value
* input[2] - Minimum value
* input[3] - Maximum value
* input[4] - Clamp output when disabled
*
************************************************************************/
#define DST_CLAMP__ENABLE (*(node->input[0]))
#define DST_CLAMP__IN (*(node->input[1]))
#define DST_CLAMP__MIN (*(node->input[2]))
#define DST_CLAMP__MAX (*(node->input[3]))
#define DST_CLAMP__CLAMP (*(node->input[4]))
static DISCRETE_STEP(dst_clamp)
{
if(DST_CLAMP__ENABLE)
{
if (DST_CLAMP__IN < DST_CLAMP__MIN) node->output[0] = DST_CLAMP__MIN;
else if (DST_CLAMP__IN > DST_CLAMP__MAX) node->output[0] = DST_CLAMP__MAX;
else node->output[0]= DST_CLAMP__IN;
}
else
{
node->output[0] = DST_CLAMP__CLAMP;
}
}
/************************************************************************
*
* DST_DAC_R1 - R1 Ladder DAC with cap smoothing
*
* input[0] - Enable
* input[1] - Binary Data Input
* input[2] - Data On Voltage (3.4 for TTL)
*
* also passed discrete_dac_r1_ladder structure
*
* Mar 2004, D Renaud.
************************************************************************/
#define DST_DAC_R1__ENABLE (*(node->input[0]))
#define DST_DAC_R1__DATA (*(node->input[1]))
#define DST_DAC_R1__VON (*(node->input[2]))
static DISCRETE_STEP(dst_dac_r1)
{
const discrete_dac_r1_ladder *info = node->custom;
struct dst_dac_r1_context *context = node->context;
int bit, bit_val, data;
double v, i_bit, i_total, x_time;
i_total = context->i_bias;
data = (int)DST_DAC_R1__DATA;
x_time = DST_DAC_R1__DATA - data;
if (DST_DAC_R1__ENABLE)
{
for (bit=0; bit < info->ladderLength; bit++)
{
/* Add up currents of ON circuits per Millman. */
/* ignore if no resistor present */
if (info->r[bit] != 0)
{
i_bit = DST_DAC_R1__VON / info->r[bit];
bit_val = (data >> bit) & 0x01;
if ((x_time != 0) && (bit_val != ((context->last_data >> bit) & 0x01)))
{
/* there is x_time and a change in bit,
* so anti-alias the current */
i_bit *= bit_val ? x_time : 1.0 - x_time;
}
else
{
/* there is no x_time or a change in bit,
* so 0 the current if the bit value is 0 */
if (bit_val == 0) i_bit = 0;
}
i_total += i_bit;
}
}
v = i_total * context->r_total;
context->last_data = data;
/* Filter if needed, else just output voltage */
node->output[0] = info->cFilter ? node->output[0] + ((v - node->output[0]) * context->exponent) : v;
}
else
{
/*
* If module is disabled we will just leave the voltage where it was.
* We may want to set it to 0 in the future, but we will probably never
* disable this module.
*/
}
}
static DISCRETE_RESET(dst_dac_r1)
{
const discrete_dac_r1_ladder *info = node->custom;
struct dst_dac_r1_context *context = node->context;
int bit;
/* Calculate the Millman current of the bias circuit */
if (info->rBias)
context->i_bias = info->vBias / info->rBias;
else
context->i_bias = 0;
/*
* We will do a small amount of error checking.
* But if you are an idiot and pass a bad ladder table
* then you deserve a crash.
*/
if (info->ladderLength < 2)
{
/* You need at least 2 resistors for a ladder */
discrete_log("dst_dac_r1_reset - Ladder length too small");
}
if (info->ladderLength > DISC_LADDER_MAXRES )
{
discrete_log("dst_dac_r1_reset - Ladder length exceeds DISC_LADDER_MAXRES");
}
/*
* Calculate the total of all resistors in parallel.
* This is the combined resistance of the voltage sources.
* This is used for the charging curve.
*/
context->r_total = 0;
for(bit = 0; bit < info->ladderLength; bit++)
{
if (info->r[bit] != 0)
context->r_total += 1.0 / info->r[bit];
}
if (info->rBias) context->r_total += 1.0 / info->rBias;
if (info->rGnd) context->r_total += 1.0 / info->rGnd;
context->r_total = 1.0 / context->r_total;
node->output[0] = 0;
if (info->cFilter)
{
/* Setup filter constants */
context->exponent = RC_CHARGE_EXP(context->r_total * info->cFilter);
}
}
/************************************************************************
*
* DST_DIODE_MIX - Diode Mixer
*
* input[0] - Input 0
* .....
*
* Dec 2004, D Renaud.
************************************************************************/
#define DST_DIODE_MIX_INP_OFFSET 0
#define DST_DIODE_MIX__INP(addr) (*(node->input[DST_DIODE_MIX_INP_OFFSET + addr]))
static DISCRETE_STEP(dst_diode_mix)
{
struct dst_diode_mix__context *context = node->context;
double val, max = 0;
int addr;
for (addr = 0; addr < context->size; addr++)
{
val = DST_DIODE_MIX__INP(addr) - context->v_junction[addr];
if (val > max) max = val;
}
if (max < 0) max = 0;
node->output[0] = max;
}
static DISCRETE_RESET(dst_diode_mix)
{
const double *info = node->custom;
struct dst_diode_mix__context *context = node->context;
int addr;
context->size = node->active_inputs - DST_DIODE_MIX_INP_OFFSET;
assert(context->size <= 8);
for (addr = 0; addr < context->size; addr++)
{
if (info == NULL)
{
/* setup default junction voltage */
context->v_junction[addr] = 0.5;
}
else
{
/* use supplied junction voltage */
context->v_junction[addr] = *info++;
}
}
DISCRETE_STEP_CALL(dst_diode_mix);
}
/************************************************************************
*
* DST_DIVIDE - Programmable divider with enable
*
* input[0] - Enable input value
* input[1] - Channel0 input value
* input[2] - Divisor
*
************************************************************************/
#define DST_DIVIDE__ENABLE (*(node->input[0]))
#define DST_DIVIDE__IN (*(node->input[1]))
#define DST_DIVIDE__DIV (*(node->input[2]))
static DISCRETE_STEP(dst_divide)
{
if(DST_DIVIDE__ENABLE)
{
if(DST_DIVIDE__DIV == 0)
{
node->output[0 ]= DBL_MAX; /* Max out but don't break */
discrete_log("dst_divider_step() - Divide by Zero attempted in NODE_%02d.\n",NODE_INDEX(node->node));
}
else
{
node->output[0]= DST_DIVIDE__IN / DST_DIVIDE__DIV;
}
}
else
{
node->output[0]=0;
}
}
/************************************************************************
*
* DST_GAIN - This is a programmable gain module with enable function
*
* input[0] - Enable input value
* input[1] - Channel0 input value
* input[2] - Gain value
* input[3] - Final addition offset
*
************************************************************************/
#define DST_GAIN__ENABLE (*(node->input[0]))
#define DST_GAIN__IN (*(node->input[1]))
#define DST_GAIN__GAIN (*(node->input[2]))
#define DST_GAIN__OFFSET (*(node->input[3]))
static DISCRETE_STEP(dst_gain)
{
if(DST_GAIN__ENABLE)
{
node->output[0] = DST_GAIN__IN * DST_GAIN__GAIN;
node->output[0] += DST_GAIN__OFFSET;
}
else
{
node->output[0] = 0;
}
}
/************************************************************************
*
* DST_INTEGRATE - Integration circuits
*
* input[0] - Trigger 0
* input[1] - Trigger 1
*
* also passed discrete_integrate_info structure
*
* Mar 2004, D Renaud.
************************************************************************/
#define DST_INTEGRATE__TRG0 (*(node->input[0]))
#define DST_INTEGRATE__TRG1 (*(node->input[1]))
int dst_trigger_function(int trig0, int trig1, int trig2, int function)
{
int result = 1;
switch (function)
{
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG0:
result = trig0;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG0_INV:
result = !trig0;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG1:
result = trig1;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG1_INV:
result = !trig1;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG2:
result = trig2;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG2_INV:
result = !trig2;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG01_AND:
result = trig0 && trig1;
break;
case DISC_OP_AMP_TRIGGER_FUNCTION_TRG01_NAND:
result = !(trig0 && trig1);
break;
}
return (result);
}
static DISCRETE_STEP(dst_integrate)
{
const discrete_integrate_info *info = node->custom;
struct dst_integrate_context *context = node->context;
int trig0, trig1;
double i_neg = 0; /* current into - input */
double i_pos = 0; /* current into + input */
switch (info->type)
{
case DISC_INTEGRATE_OP_AMP_1:
if (DST_INTEGRATE__TRG0 != 0)
{
/* This forces the cap to completely charge,
* and the output to go to it's max value.
*/
node->output[0] = context->v_max_out;
return;
}
node->output[0] -= context->change;
break;
case DISC_INTEGRATE_OP_AMP_1 | DISC_OP_AMP_IS_NORTON:
i_neg = context->v_max_in / info->r1;
i_pos = (DST_INTEGRATE__TRG0 - OP_AMP_NORTON_VBE) / info->r2;
if (i_pos < 0) i_pos = 0;
node->output[0] += (i_pos - i_neg) / discrete_current_context->sample_rate / info->c;
break;
case DISC_INTEGRATE_OP_AMP_2 | DISC_OP_AMP_IS_NORTON:
trig0 = (int)DST_INTEGRATE__TRG0;
trig1 = (int)DST_INTEGRATE__TRG1;
i_neg = dst_trigger_function(trig0, trig1, 0, info->f0) ? context->v_max_in_d / info->r1 : 0;
i_pos = dst_trigger_function(trig0, trig1, 0, info->f1) ? context->v_max_in / info->r2 : 0;
i_pos += dst_trigger_function(trig0, trig1, 0, info->f2) ? context->v_max_in_d / info->r3 : 0;
node->output[0] += (i_pos - i_neg) / discrete_current_context->sample_rate / info->c;
break;
}
/* Clip the output. */
if (node->output[0] < 0) node->output[0] = 0;
if (node->output[0] > context->v_max_out) node->output[0] = context->v_max_out;
}
static DISCRETE_RESET(dst_integrate)
{
const discrete_integrate_info *info = node->custom;
struct dst_integrate_context *context = node->context;
double i, v;
if (info->type & DISC_OP_AMP_IS_NORTON)
{
context->v_max_out = info->vP - OP_AMP_NORTON_VBE;
context->v_max_in = info->v1 - OP_AMP_NORTON_VBE;
context->v_max_in_d = context->v_max_in - OP_AMP_NORTON_VBE;
}
else
{
context->v_max_out = info->vP - OP_AMP_VP_RAIL_OFFSET;
v = info->v1 * info->r3 / (info->r2 + info->r3); /* vRef */
v = info->v1 - v; /* actual charging voltage */
i = v / info->r1;
context->change = i / discrete_current_context->sample_rate / info->c;
}
node->output[0] = 0;
}
/************************************************************************
*
* DST_LOGIC_INV - Logic invertor gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
*
************************************************************************/
#define DST_LOGIC_INV__ENABLE (*(node->input[0]))
#define DST_LOGIC_INV__IN (*(node->input[1]))
static DISCRETE_STEP(dst_logic_inv)
{
if(DST_LOGIC_INV__ENABLE)
{
node->output[0] = DST_LOGIC_INV__IN ? 0.0 : 1.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_AND - Logic AND gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - input[1] value
* input[3] - input[2] value
* input[4] - input[3] value
*
************************************************************************/
#define DST_LOGIC_AND__ENABLE (*(node->input[0]))
#define DST_LOGIC_AND__IN0 (*(node->input[1]))
#define DST_LOGIC_AND__IN1 (*(node->input[2]))
#define DST_LOGIC_AND__IN2 (*(node->input[3]))
#define DST_LOGIC_AND__IN3 (*(node->input[4]))
static DISCRETE_STEP(dst_logic_and)
{
if(DST_LOGIC_AND__ENABLE)
{
node->output[0] = (DST_LOGIC_AND__IN0 && DST_LOGIC_AND__IN1 && DST_LOGIC_AND__IN2 && DST_LOGIC_AND__IN3)? 1.0 : 0.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_NAND - Logic NAND gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - input[1] value
* input[3] - input[2] value
* input[4] - input[3] value
*
************************************************************************/
#define DST_LOGIC_NAND__ENABLE (*(node->input[0]))
#define DST_LOGIC_NAND__IN0 (*(node->input[1]))
#define DST_LOGIC_NAND__IN1 (*(node->input[2]))
#define DST_LOGIC_NAND__IN2 (*(node->input[3]))
#define DST_LOGIC_NAND__IN3 (*(node->input[4]))
static DISCRETE_STEP(dst_logic_nand)
{
if(DST_LOGIC_NAND__ENABLE)
{
node->output[0]= (DST_LOGIC_NAND__IN0 && DST_LOGIC_NAND__IN1 && DST_LOGIC_NAND__IN2 && DST_LOGIC_NAND__IN3)? 0.0 : 1.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_OR - Logic OR gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - input[1] value
* input[3] - input[2] value
* input[4] - input[3] value
*
************************************************************************/
#define DST_LOGIC_OR__ENABLE (*(node->input[0]))
#define DST_LOGIC_OR__IN0 (*(node->input[1]))
#define DST_LOGIC_OR__IN1 (*(node->input[2]))
#define DST_LOGIC_OR__IN2 (*(node->input[3]))
#define DST_LOGIC_OR__IN3 (*(node->input[4]))
static DISCRETE_STEP(dst_logic_or)
{
if(DST_LOGIC_OR__ENABLE)
{
node->output[0] = (DST_LOGIC_OR__IN0 || DST_LOGIC_OR__IN1 || DST_LOGIC_OR__IN2 || DST_LOGIC_OR__IN3) ? 1.0 : 0.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_NOR - Logic NOR gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - input[1] value
* input[3] - input[2] value
* input[4] - input[3] value
*
************************************************************************/
#define DST_LOGIC_NOR__ENABLE (*(node->input[0]))
#define DST_LOGIC_NOR__IN0 (*(node->input[1]))
#define DST_LOGIC_NOR__IN1 (*(node->input[2]))
#define DST_LOGIC_NOR__IN2 (*(node->input[3]))
#define DST_LOGIC_NOR__IN3 (*(node->input[4]))
static DISCRETE_STEP(dst_logic_nor)
{
if(DST_LOGIC_NOR__ENABLE)
{
node->output[0] = (DST_LOGIC_NOR__IN0 || DST_LOGIC_NOR__IN1 || DST_LOGIC_NOR__IN2 || DST_LOGIC_NOR__IN3) ? 0.0 : 1.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_XOR - Logic XOR gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - input[1] value
*
************************************************************************/
#define DST_LOGIC_XOR__ENABLE (*(node->input[0]))
#define DST_LOGIC_XOR__IN0 (*(node->input[1]))
#define DST_LOGIC_XOR__IN1 (*(node->input[2]))
static DISCRETE_STEP(dst_logic_xor)
{
if(DST_LOGIC_XOR__ENABLE)
{
node->output[0] = ((DST_LOGIC_XOR__IN0 && !DST_LOGIC_XOR__IN1) || (!DST_LOGIC_XOR__IN0 && DST_LOGIC_XOR__IN1)) ? 1.0 : 0.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_NXOR - Logic NXOR gate implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - input[1] value
*
************************************************************************/
#define DST_LOGIC_XNOR__ENABLE (*(node->input[0]))
#define DST_LOGIC_XNOR__IN0 (*(node->input[1]))
#define DST_LOGIC_XNOR__IN1 (*(node->input[2]))
static DISCRETE_STEP(dst_logic_nxor)
{
if(DST_LOGIC_XNOR__ENABLE)
{
node->output[0] = ((DST_LOGIC_XNOR__IN0 && !DST_LOGIC_XNOR__IN1) || (!DST_LOGIC_XNOR__IN0 && DST_LOGIC_XNOR__IN1)) ? 0.0 : 1.0;
}
else
{
node->output[0] = 0.0;
}
}
/************************************************************************
*
* DST_LOGIC_DFF - Standard D-type flip-flop implementation
*
* input[0] - enable
* input[1] - /Reset
* input[2] - /Set
* input[3] - clock
* input[4] - data
*
************************************************************************/
#define DST_LOGIC_DFF__ENABLE (*(node->input[0]))
#define DST_LOGIC_DFF__RESET !(*(node->input[1]))
#define DST_LOGIC_DFF__SET !(*(node->input[2]))
#define DST_LOGIC_DFF__CLOCK (*(node->input[3]))
#define DST_LOGIC_DFF__DATA (*(node->input[4]))
static DISCRETE_STEP(dst_logic_dff)
{
struct dst_flipflop_context *context = node->context;
int clk = (int)DST_LOGIC_DFF__CLOCK;
if (DST_LOGIC_DFF__ENABLE)
{
if (DST_LOGIC_DFF__RESET)
node->output[0] = 0;
else if (DST_LOGIC_DFF__SET)
node->output[0] = 1;
else if (!context->last_clk && clk) /* low to high */
node->output[0] = DST_LOGIC_DFF__DATA;
}
else
{
node->output[0] = 0;
}
context->last_clk = clk;
}
static DISCRETE_RESET(dst_logic_ff)
{
struct dst_flipflop_context *context = node->context;
context->last_clk = 0;
node->output[0] = 0;
}
/************************************************************************
*
* DST_LOGIC_JKFF - Standard JK-type flip-flop implementation
*
* input[0] - enable
* input[1] - /Reset
* input[2] - /Set
* input[3] - clock
* input[4] - J
* input[5] - K
*
************************************************************************/
#define DST_LOGIC_JKFF__ENABLE (*(node->input[0]))
#define DST_LOGIC_JKFF__RESET !(*(node->input[1]))
#define DST_LOGIC_JKFF__SET !(*(node->input[2]))
#define DST_LOGIC_JKFF__CLOCK (*(node->input[3]))
#define DST_LOGIC_JKFF__J (*(node->input[4]))
#define DST_LOGIC_JKFF__K (*(node->input[5]))
static DISCRETE_STEP(dst_logic_jkff)
{
struct dst_flipflop_context *context = node->context;
int clk = (int)DST_LOGIC_JKFF__CLOCK;
int j = (int)DST_LOGIC_JKFF__J;
int k = (int)DST_LOGIC_JKFF__K;
if (DST_LOGIC_JKFF__ENABLE)
{
if (DST_LOGIC_JKFF__RESET)
node->output[0] = 0;
else if (DST_LOGIC_JKFF__SET)
node->output[0] = 1;
else if (context->last_clk && !clk) /* high to low */
{
if (!j)
{
/* J=0, K=0 - Hold */
if (k)
/* J=0, K=1 - Reset */
node->output[0] = 0;
}
else
{
if (!k)
/* J=1, K=0 - Set */
node->output[0] = 1;
else
/* J=1, K=1 - Toggle */
node->output[0] = !(int)node->output[0];
}
}
}
else
{
node->output[0] = 0;
}
context->last_clk = clk;
}
/************************************************************************
*
* DST_LOOKUP_TABLE - Return value from lookup table
*
* input[0] - Enable input value
* input[1] - Input 1
* input[2] - Table size
*
* Also passed address of the lookup table
*
* Feb 2007, D Renaud.
************************************************************************/
#define DST_LOOKUP_TABLE__ENABLE (*(node->input[0]))
#define DST_LOOKUP_TABLE__IN (*(node->input[1]))
#define DST_LOOKUP_TABLE__SIZE (*(node->input[2]))
static DISCRETE_STEP(dst_lookup_table)
{
const double *table = node->custom;
int addr = DST_LOOKUP_TABLE__IN;
if (!DST_LOOKUP_TABLE__ENABLE || addr < 0 || addr >= DST_LOOKUP_TABLE__SIZE)
node->output[0] = 0;
else
node->output[0] = table[addr];
}
/************************************************************************
*
* DST_MIXER - Mixer/Gain stage
*
* input[0] - Enable input value
* input[1] - Input 1
* input[2] - Input 2
* input[3] - Input 3
* input[4] - Input 4
* input[5] - Input 5
* input[6] - Input 6
* input[7] - Input 7
* input[8] - Input 8
*
* Also passed discrete_mixer_info structure
*
* Mar 2004, D Renaud.
************************************************************************/
/*
* The input resistors can be a combination of static values and nodes.
* If a node is used then its value is in series with the static value.
* Also if a node is used and its value is 0, then that means the
* input is disconnected from the circuit.
*
* There are 3 basic types of mixers, defined by the 2 types. The
* op amp mixer is further defined by the prescence of rI. This is a
* brief explaination.
*
* DISC_MIXER_IS_RESISTOR
* The inputs are high pass filtered if needed, using (rX || rF) * cX.
* Then Millman is used for the voltages.
* r = (1/rF + 1/r1 + 1/r2...)
* i = (v1/r1 + v2/r2...)
* v = i * r
*
* DISC_MIXER_IS_OP_AMP - no rI
* This is just a summing circuit.
* The inputs are high pass filtered if needed, using rX * cX.
* Then a modified Millman is used for the voltages.
* i = ((vRef - v1)/r1 + (vRef - v2)/r2...)
* v = i * rF
*
* DISC_MIXER_IS_OP_AMP_WITH_RI
* The inputs are high pass filtered if needed, using (rX + rI) * cX.
* Then Millman is used for the voltages including vRef/rI.
* r = (1/rI + 1/r1 + 1/r2...)
* i = (vRef/rI + v1/r1 + v2/r2...)
* The voltage is then modified by an inverting amp formula.
* v = vRef + (rF/rI) * (vRef - (i * r))
*/
#define DST_MIXER__ENABLE (*(node->input[0]))
#define DST_MIXER__IN(bit) (*(node->input[bit + 1]))
static DISCRETE_STEP(dst_mixer)
{
const discrete_mixer_desc *info = node->custom;
struct dst_mixer_context *context = node->context;
double v, vTemp, r_total, rTemp, rTemp2 = 0;
double i = 0; /* total current of inputs */
int bit, connected;
/* put commonly used stuff in local variables for speed */
int r_node_bit_flag = context->r_node_bit_flag;
int c_bit_flag = context->c_bit_flag;
int bit_mask = 1;
int has_rF = (info->rF != 0);
int type = context->type;
double v_ref = info->vRef;
double rI = info->rI;
if (DST_MIXER__ENABLE)
{
r_total = context->r_total;
if (context->r_node_bit_flag != 0)
{
/* loop and do any high pass filtering for connected caps */
/* but first see if there is an r_node for the current path */
/* if so, then the exponents need to be re-calculated */
for (bit = 0; bit < context->size; bit++)
{
rTemp = info->r[bit];
connected = 1;
vTemp = DST_MIXER__IN(bit);
/* is there a resistor? */
if (r_node_bit_flag & bit_mask)
{
/* a node has the possibility of being disconnected from the circuit. */
if (*context->r_node[bit] == 0)
connected = 0;
else
{
/* value currently holds resistance */
rTemp += *context->r_node[bit];
r_total += 1.0 / rTemp;
/* is there a capacitor? */
if (c_bit_flag & bit_mask)
{
switch (type)
{
case DISC_MIXER_IS_RESISTOR:
/* is there an rF? */
if (has_rF)
{
rTemp2 = RES_2_PARALLEL(rTemp, info->rF);
break;
}
/* else, fall through and just use the resistor value */
case DISC_MIXER_IS_OP_AMP:
rTemp2 = rTemp;
break;
case DISC_MIXER_IS_OP_AMP_WITH_RI:
rTemp2 = rTemp + rI;
break;
}
/* Re-calculate exponent if resistor is a node and has changed value */
if (*context->r_node[bit] != context->r_last[bit])
{
context->exponent_rc[bit] = RC_CHARGE_EXP(rTemp2 * info->c[bit]);
context->r_last[bit] = *context->r_node[bit];
}
}
}
}
if (connected)
{
/* is there a capacitor? */
if (c_bit_flag & bit_mask)
{
/* do input high pass filtering if needed. */
context->v_cap[bit] += (vTemp - v_ref - context->v_cap[bit]) * context->exponent_rc[bit];
vTemp -= context->v_cap[bit];
}
i += ((type == DISC_MIXER_IS_OP_AMP) ? v_ref - vTemp : vTemp) / rTemp;
}
bit_mask = bit_mask << 1;
}
}
else
{
/* no r_nodes, so just do high pass filtering */
for (bit = 0; bit < context->size; bit++)
{
vTemp = DST_MIXER__IN(bit);
if (c_bit_flag & (1 << bit))
{
/* do input high pass filtering if needed. */
context->v_cap[bit] += (vTemp - v_ref - context->v_cap[bit]) * context->exponent_rc[bit];
vTemp -= context->v_cap[bit];
}
i += ((type == DISC_MIXER_IS_OP_AMP) ? v_ref - vTemp : vTemp) / info->r[bit];
}
}
if (type == DISC_MIXER_IS_OP_AMP_WITH_RI)
i += v_ref / rI;
r_total = 1.0 / r_total;
/* If resistor network or has rI then Millman is used.
* If op-amp then summing formula is used. */
v = i * ((type == DISC_MIXER_IS_OP_AMP) ? info->rF : r_total);
if (type == DISC_MIXER_IS_OP_AMP_WITH_RI)
v = v_ref + (context->gain * (v_ref - v));
/* Do the low pass filtering for cF */
if (info->cF != 0)
{
if (r_node_bit_flag != 0)
{
/* Re-calculate exponent if resistor nodes are used */
context->exponent_c_f = RC_CHARGE_EXP(r_total * info->cF);
}
context->v_cap_f += (v - v_ref - context->v_cap_f) * context->exponent_c_f;
v = context->v_cap_f;
}
/* Do the high pass filtering for cAmp */
if (info->cAmp != 0)
{
context->v_cap_amp += (v - context->v_cap_amp) * context->exponent_c_amp;
v -= context->v_cap_amp;
}
node->output[0] = v * info->gain;
}
else
{
node->output[0] = 0;
}
}
static DISCRETE_RESET(dst_mixer)
{
const discrete_mixer_desc *info = node->custom;
struct dst_mixer_context *context = node->context;
node_description *r_node;
int bit;
double rTemp = 0;
/* link to r_node outputs */
context->r_node_bit_flag = 0;
for (bit = 0; bit < 8; bit++)
{
r_node = discrete_find_node(NULL, info->r_node[bit]);
if (r_node != NULL)
{
context->r_node[bit] = &(r_node->output[NODE_CHILD_NODE_NUM(info->r_node[bit])]);
context->r_node_bit_flag |= 1 << bit;
}
else
context->r_node[bit] = NULL;
/* flag any caps */
if (info->c[bit] != 0)
context->c_bit_flag |= 1 << bit;
}
context->size = node->active_inputs - 1;
/*
* THERE IS NO ERROR CHECKING!!!!!!!!!
* If you pass a bad ladder table
* then you deserve a crash.
*/
context->type = info->type;
if ((info->type == DISC_MIXER_IS_OP_AMP) && (info->rI != 0))
context->type = DISC_MIXER_IS_OP_AMP_WITH_RI;
/*
* Calculate the total of all resistors in parallel.
* This is the combined resistance of the voltage sources.
* Also calculate the exponents while we are here.
*/
context->r_total = 0;
for(bit = 0; bit < context->size; bit++)
{
if ((info->r[bit] != 0) && !info->r_node[bit] )
{
context->r_total += 1.0 / info->r[bit];
}
context->v_cap[bit] = 0;
context->exponent_rc[bit] = 0;
if ((info->c[bit] != 0) && !info->r_node[bit])
{
switch (context->type)
{
case DISC_MIXER_IS_RESISTOR:
/* is there an rF? */
if (info->rF != 0)
{
rTemp = 1.0 / ((1.0 / info->r[bit]) + (1.0 / info->rF));
break;
}
/* else, fall through and just use the resistor value */
case DISC_MIXER_IS_OP_AMP:
rTemp = info->r[bit];
break;
case DISC_MIXER_IS_OP_AMP_WITH_RI:
rTemp = info->r[bit] + info->rI;
break;
}
/* Setup filter constants */
context->exponent_rc[bit] = RC_CHARGE_EXP(rTemp * info->c[bit]);
}
}
if (info->rF != 0)
{
if (context->type == DISC_MIXER_IS_RESISTOR) context->r_total += 1.0 / info->rF;
}
if (context->type == DISC_MIXER_IS_OP_AMP_WITH_RI) context->r_total += 1.0 / info->rI;
context->v_cap_f = 0;
context->exponent_c_f = 0;
if (info->cF != 0)
{
/* Setup filter constants */
context->exponent_c_f = RC_CHARGE_EXP(((info->type == DISC_MIXER_IS_OP_AMP) ? info->rF : (1.0 / context->r_total)) * info->cF);
}
context->v_cap_amp = 0;
context->exponent_c_amp = 0;
if (info->cAmp != 0)
{
/* Setup filter constants */
/* We will use 100k ohms as an average final stage impedance. */
/* Your amp/speaker system will have more effect on incorrect filtering then any value used here. */
context->exponent_c_amp = RC_CHARGE_EXP(RES_K(100) * info->cAmp);
}
if (context->type == DISC_MIXER_IS_OP_AMP_WITH_RI) context->gain = info->rF / info->rI;
node->output[0] = 0;
}
/************************************************************************
*
* DST_MULTIPLEX - 1 of x multiplexer/switch
*
* input[0] - Enable input value
* input[1] - switch position
* input[2] - input[0]
* input[3] - input[1]
* .....
*
* Dec 2004, D Renaud.
************************************************************************/
#define DST_MULTIPLEX__ENABLE (*(node->input[0]))
#define DST_MULTIPLEX__ADDR (*(node->input[1]))
#define DST_MULTIPLEX__INP(addr) (*(node->input[2 + addr]))
static DISCRETE_STEP(dst_multiplex)
{
struct dst_size_context *context = node->context;
int addr;
if(DST_MULTIPLEX__ENABLE)
{
addr = DST_MULTIPLEX__ADDR; /* FP to INT */
if ((addr >= 0) && (addr < context->size))
{
node->output[0] = DST_MULTIPLEX__INP(addr);
}
else
{
/* Bad address. We will leave the output alone. */
discrete_log("NODE_%02d - Address = %d. Out of bounds\n", node->node-NODE_00, addr);
}
}
else
{
node->output[0] = 0;
}
}
static DISCRETE_RESET(dst_multiplex)
{
struct dst_size_context *context = node->context;
context->size = node->active_inputs - 2;
DISCRETE_STEP_CALL(dst_multiplex);
}
/************************************************************************
*
* DST_ONESHOT - Usage of node_description values for one shot pulse
*
* input[0] - Reset value
* input[1] - Trigger value
* input[2] - Amplitude value
* input[3] - Width of oneshot pulse
* input[4] - type R/F edge, Retriggerable?
*
* Complete re-write Jan 2004, D Renaud.
************************************************************************/
#define DST_ONESHOT__RESET (*(node->input[0]))
#define DST_ONESHOT__TRIG (*(node->input[1]))
#define DST_ONESHOT__AMP (*(node->input[2]))
#define DST_ONESHOT__WIDTH (*(node->input[3]))
#define DST_ONESHOT__TYPE (int)(*(node->input[4]))
static DISCRETE_STEP(dst_oneshot)
{
struct dst_oneshot_context *context = node->context;
int trigger = (DST_ONESHOT__TRIG != 0);
/* If the state is triggered we will need to countdown later */
int do_count = context->state;
if (DST_ONESHOT__RESET)
{
/* Hold in Reset */
node->output[0] = 0;
context->state = 0;
}
else
{
/* are we at an edge? */
if (trigger != context->last_trig)
{
/* There has been a trigger edge */
context->last_trig = trigger;
/* Is it the proper edge trigger */
if ((DST_ONESHOT__TYPE & DISC_ONESHOT_REDGE) ? trigger : !trigger)
{
if (!context->state)
{
/* We have first trigger */
context->state = 1;
node->output[0] = (DST_ONESHOT__TYPE & DISC_OUT_ACTIVE_LOW) ? 0 : DST_ONESHOT__AMP;
context->countdown = DST_ONESHOT__WIDTH;
}
else
{
/* See if we retrigger */
if (DST_ONESHOT__TYPE & DISC_ONESHOT_RETRIG)
{
/* Retrigger */
context->countdown = DST_ONESHOT__WIDTH;
do_count = 0;
}
}
}
}
if (do_count)
{
context->countdown -= discrete_current_context->sample_time;
if(context->countdown <= 0.0)
{
node->output[0] = (DST_ONESHOT__TYPE & DISC_OUT_ACTIVE_LOW) ? DST_ONESHOT__AMP : 0;
context->countdown = 0;
context->state = 0;
}
}
}
}
static DISCRETE_RESET(dst_oneshot)
{
struct dst_oneshot_context *context = node->context;
context->countdown = 0;
context->state = 0;
context->last_trig = 0;
node->output[0] = (DST_ONESHOT__TYPE & DISC_OUT_ACTIVE_LOW) ? DST_ONESHOT__AMP : 0;
}
/************************************************************************
*
* DST_RAMP - Ramp up/down model usage
*
* input[0] - Enable ramp
* input[1] - Ramp Reverse/Forward switch
* input[2] - Gradient, change/sec
* input[3] - Start value
* input[4] - End value
* input[5] - Clamp value when disabled
*
************************************************************************/
#define DST_RAMP__ENABLE (*(node->input[0]))
#define DST_RAMP__DIR (*(node->input[1]))
#define DST_RAMP__GRAD (*(node->input[2]))
#define DST_RAMP__START (*(node->input[3]))
#define DST_RAMP__END (*(node->input[4]))
#define DST_RAMP__CLAMP (*(node->input[5]))
static DISCRETE_STEP(dst_ramp)
{
struct dss_ramp_context *context = node->context;
if(DST_RAMP__ENABLE)
{
if (!context->last_en)
{
context->last_en = 1;
node->output[0] = DST_RAMP__START;
}
if(context->dir ? DST_RAMP__DIR : !DST_RAMP__DIR) node->output[0]+=context->step;
else node->output[0] -= context->step;
/* Clamp to min/max */
if(context->dir ? (node->output[0] < DST_RAMP__START)
: (node->output[0] > DST_RAMP__START)) node->output[0] = DST_RAMP__START;
if(context->dir ? (node->output[0] > DST_RAMP__END)
: (node->output[0] < DST_RAMP__END)) node->output[0] = DST_RAMP__END;
}
else
{
context->last_en = 0;
/* Disabled so clamp to output */
node->output[0] = DST_RAMP__CLAMP;
}
}
static DISCRETE_RESET(dst_ramp)
{
struct dss_ramp_context *context = node->context;
node->output[0] = DST_RAMP__CLAMP;
context->step = DST_RAMP__GRAD / discrete_current_context->sample_rate;
context->dir = ((DST_RAMP__END - DST_RAMP__START) == abs(DST_RAMP__END - DST_RAMP__START));
context->last_en = 0;
}
/************************************************************************
*
* DST_SAMPHOLD - Sample & Hold Implementation
*
* input[0] - Enable
* input[1] - input[0] value
* input[2] - clock node
* input[3] - clock type
*
************************************************************************/
#define DST_SAMPHOLD__ENABLE (*(node->input[0]))
#define DST_SAMPHOLD__IN0 (*(node->input[1]))
#define DST_SAMPHOLD__CLOCK (*(node->input[2]))
#define DST_SAMPHOLD__TYPE (*(node->input[3]))
static DISCRETE_STEP(dst_samphold)
{
struct dst_samphold_context *context = node->context;
if(DST_SAMPHOLD__ENABLE)
{
switch(context->clocktype)
{
case DISC_SAMPHOLD_REDGE:
/* Clock the whole time the input is rising */
if (DST_SAMPHOLD__CLOCK > context->last_input) node->output[0] = DST_SAMPHOLD__IN0;
break;
case DISC_SAMPHOLD_FEDGE:
/* Clock the whole time the input is falling */
if(DST_SAMPHOLD__CLOCK < context->last_input) node->output[0] = DST_SAMPHOLD__IN0;
break;
case DISC_SAMPHOLD_HLATCH:
/* Output follows input if clock != 0 */
if( DST_SAMPHOLD__CLOCK) node->output[0] = DST_SAMPHOLD__IN0;
break;
case DISC_SAMPHOLD_LLATCH:
/* Output follows input if clock == 0 */
if (DST_SAMPHOLD__CLOCK == 0) node->output[0] = DST_SAMPHOLD__IN0;
break;
default:
discrete_log("dst_samphold_step - Invalid clocktype passed");
break;
}
}
else
{
node->output[0] = 0;
}
/* Save the last value */
context->last_input = DST_SAMPHOLD__CLOCK;
}
static DISCRETE_RESET(dst_samphold)
{
struct dst_samphold_context *context = node->context;
node->output[0] = 0;
context->last_input = -1;
/* Only stored in here to speed up and save casting in the step function */
context->clocktype = (int)DST_SAMPHOLD__TYPE;
DISCRETE_STEP_CALL(dst_samphold);
}
/************************************************************************
*
* DSS_SWITCH - Programmable 2 pole switch module with enable function
*
* input[0] - Enable input value
* input[1] - switch position
* input[2] - input[0]
* input[3] - input[1]
*
************************************************************************/
#define DSS_SWITCH__ENABLE (*(node->input[0]))
#define DSS_SWITCH__SWITCH (*(node->input[1]))
#define DSS_SWITCH__IN0 (*(node->input[2]))
#define DSS_SWITCH__IN1 (*(node->input[3]))
static DISCRETE_STEP(dst_switch)
{
if(DSS_SWITCH__ENABLE)
{
node->output[0] = DSS_SWITCH__SWITCH ? DSS_SWITCH__IN1 : DSS_SWITCH__IN0;
}
else
{
node->output[0] = 0;
}
}
/************************************************************************
*
* DSS_ASWITCH - Analog switch
*
* input[0] - Enable input value
* input[1] - Control
* input[2] - Input
* input[3] - Threshold for enable
*
************************************************************************/
#define DSS_ASWITCH__ENABLE (*(node->input[0]))
#define DSS_ASWITCH__CTRL (*(node->input[1]))
#define DSS_ASWITCH__IN (*(node->input[2]))
#define DSS_ASWITCH__THRESHOLD (*(node->input[3]))
static DISCRETE_STEP(dst_aswitch)
{
if(DSS_SWITCH__ENABLE)
{
node->output[0] = DSS_ASWITCH__CTRL > DSS_ASWITCH__THRESHOLD ? DSS_ASWITCH__IN : 0;
}
else
{
node->output[0] = 0;
}
}
/************************************************************************
*
* DST_TRANSFORM - Programmable math module with enable function
*
* input[0] - Enable input value
* input[1] - Channel0 input value
* input[2] - Channel1 input value
* input[3] - Channel2 input value
* input[4] - Channel3 input value
* input[5] - Channel4 input value
*
************************************************************************/
#define DST_TRANSFORM__IN0 (*(node->input[0]))
#define DST_TRANSFORM__IN1 (*(node->input[1]))
#define DST_TRANSFORM__IN2 (*(node->input[2]))
#define DST_TRANSFORM__IN3 (*(node->input[3]))
#define DST_TRANSFORM__IN4 (*(node->input[4]))
#define MAX_TRANS_STACK 16
INLINE double dst_transform_pop(double *stack, int *pointer)
{
//decrement THEN read
assert(*pointer > 0);
(*pointer)--;
return stack[*pointer];
}
INLINE void dst_transform_push(double *stack, int *pointer, double value)
{
//Store THEN increment
assert(*pointer < MAX_TRANS_STACK);
stack[(*pointer)++] = value;
}
static DISCRETE_STEP(dst_transform)
{
double trans_stack[MAX_TRANS_STACK];
double number1,top;
int trans_stack_ptr = 0;
const char *fPTR = node->custom;
node->output[0] = 0;
top = HUGE_VAL;
while(*fPTR != 0)
{
switch (*fPTR++)
{
case '*':
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = number1 * top;
break;
case '/':
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = number1 / top;
break;
case '+':
number1=dst_transform_pop(trans_stack, &trans_stack_ptr);
top = number1 + top;
break;
case '-':
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = number1 - top;
break;
case '0':
dst_transform_push(trans_stack, &trans_stack_ptr, top);
top = DST_TRANSFORM__IN0;
break;
case '1':
dst_transform_push(trans_stack, &trans_stack_ptr, top);
top = DST_TRANSFORM__IN1;
break;
case '2':
dst_transform_push(trans_stack, &trans_stack_ptr, top);
top = DST_TRANSFORM__IN2;
break;
case '3':
dst_transform_push(trans_stack, &trans_stack_ptr, top);
top = DST_TRANSFORM__IN3;
break;
case '4':
dst_transform_push(trans_stack, &trans_stack_ptr, top);
top = DST_TRANSFORM__IN4;
break;
case 'P':
dst_transform_push(trans_stack, &trans_stack_ptr, top);
break;
case 'i': /* * -1 */
top = -top;
break;
case '!': /* Logical NOT of Last Value */
top = !top;
break;
case '=': /* Logical = */
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = (int)number1 == (int)top;
break;
case '>': /* Logical > */
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = number1 > top;
break;
case '<': /* Logical < */
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = number1 < top;
break;
case '&': /* Bitwise AND */
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = (int)number1 & (int)top;
break;
case '|': /* Bitwise OR */
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = (int)number1 | (int)top;
break;
case '^': /* Bitwise XOR */
number1 = dst_transform_pop(trans_stack, &trans_stack_ptr);
top = (int)number1 ^ (int)top;
break;
default:
discrete_log("dst_transform_step - Invalid function type/variable passed");
node->output[0] = 0;
break;
}
}
node->output[0] = top;
}
/************************************************************************
*
* DST_OP_AMP - op amp circuits
*
* input[0] - Enable
* input[1] - Input 0
* input[2] - Input 1
*
* also passed discrete_op_amp_info structure
*
* Mar 2007, D Renaud.
************************************************************************/
#define DST_OP_AMP__ENABLE (*(node->input[0]))
#define DST_OP_AMP__INP0 (*(node->input[1]))
#define DST_OP_AMP__INP1 (*(node->input[2]))
static DISCRETE_STEP(dst_op_amp)
{
const discrete_op_amp_info *info = node->custom;
struct dst_op_amp_context *context = node->context;
double i_pos = 0;
double i_neg = 0;
double i = 0;
if (DST_OP_AMP__ENABLE)
{
switch (info->type)
{
case DISC_OP_AMP_IS_NORTON:
/* work out neg pin current */
if (context->has_r1)
{
i_neg = (DST_OP_AMP__INP0 - OP_AMP_NORTON_VBE) / info->r1;
if (i_neg < 0) i_neg = 0;
}
i_neg += context->i_fixed;
/* work out neg pin current */
i_pos = (DST_OP_AMP__INP1 - OP_AMP_NORTON_VBE) / info->r2;
if (i_pos < 0) i_pos = 0;
/* work out current across r4 */
i = i_pos - i_neg;
if (context->has_cap)
{
if (context->has_r4)
{
/* voltage across r4 charging cap */
i *= info->r4;
/* exponential charge */
context->v_cap += (i - context->v_cap) * context->exponent;
}
else
/* linear charge */
context->v_cap += i / context->exponent;
node->output[0] = context->v_cap;
}
else
node->output[0] = i * info->r4;
/* clamp output */
if (node->output[0] > context->v_max) node->output[0] = context->v_max;
else if (node->output[0] < info->vN) node->output[0] = info->vN;
context->v_cap = node->output[0];
break;
default:
node->output[0] = 0;
}
}
else
node->output[0] = 0;
}
static DISCRETE_RESET(dst_op_amp)
{
const discrete_op_amp_info *info = node->custom;
struct dst_op_amp_context *context = node->context;
context->has_r1 = info->r1 > 0;
context->has_r4 = info->r4 > 0;
context->v_max = info->vP - OP_AMP_NORTON_VBE;
context->v_cap = 0;
if (info->c > 0)
{
context->has_cap = 1;
/* Setup filter constants */
if (context->has_r4)
{
/* exponential charge */
context->exponent = RC_CHARGE_EXP(info->r4 * info->c);
}
else
/* linear charge */
context->exponent = discrete_current_context->sample_rate * info->c;
}
if (info->r3 >= 0)
context->i_fixed = (info->vP - OP_AMP_NORTON_VBE) / info->r3;
}
/************************************************************************
*
* DST_OP_AMP_1SHT - op amp one shot circuits
*
* input[0] - Trigger
*
* also passed discrete_op_amp_1sht_info structure
*
* Mar 2007, D Renaud.
************************************************************************/
#define DST_OP_AMP_1SHT__TRIGGER (*(node->input[0]))
static DISCRETE_STEP(dst_op_amp_1sht)
{
const discrete_op_amp_1sht_info *info = node->custom;
struct dst_op_amp_1sht_context *context = node->context;
double i_pos;
double i_neg;
double v;
/* update trigger circuit */
i_pos = (DST_OP_AMP_1SHT__TRIGGER - context->v_cap2) / info->r2;
i_pos += node->output[0] / info->r5;
context->v_cap2 += (DST_OP_AMP_1SHT__TRIGGER - context->v_cap2) * context->exponent2;
/* calculate currents and output */
i_neg = (context->v_cap1 - OP_AMP_NORTON_VBE) / info->r3;
if (i_neg < 0) i_neg = 0;
i_neg += context->i_fixed;
if (i_pos > i_neg) node->output[0] = context->v_max;
else node->output[0] = info->vN;
/* update c1 */
/* rough value of voltage at anode of diode if discharging */
v = node->output[0] + 0.6;
if (context->v_cap1 > node->output[0])
{
/* discharge */
if (context->v_cap1 > v)
/* immediate discharge through diode */
context->v_cap1 = v;
else
/* discharge through r4 */
context->v_cap1 += (node->output[0] - context->v_cap1) * context->exponent1d;
}
else
/* charge */
context->v_cap1 += ((node->output[0] - OP_AMP_NORTON_VBE) * context->r34ratio + OP_AMP_NORTON_VBE - context->v_cap1) * context->exponent1c;
}
static DISCRETE_RESET(dst_op_amp_1sht)
{
const discrete_op_amp_1sht_info *info = node->custom;
struct dst_op_amp_1sht_context *context = node->context;
context->exponent1c = RC_CHARGE_EXP(RES_2_PARALLEL(info->r3, info->r4) * info->c1);
context->exponent1d = RC_CHARGE_EXP(info->r4 * info->c1);
context->exponent2 = RC_CHARGE_EXP(info->r2 * info->c2);
context->i_fixed = (info->vP - OP_AMP_NORTON_VBE) / info->r1;
context->v_cap1 = context->v_cap2 = 0;
context->v_max = info->vP - OP_AMP_NORTON_VBE;
context->r34ratio = info->r3 / (info->r3 + info->r4);
}
/************************************************************************
*
* DST_TVCA_OP_AMP - trigged op-amp VCA
*
* input[0] - Trigger 0
* input[1] - Trigger 1
* input[2] - Trigger 2
* input[3] - Input 0
* input[4] - Input 1
*
* also passed discrete_op_amp_tvca_info structure
*
* Mar 2004, D Renaud.
************************************************************************/
#define DST_TVCA_OP_AMP__TRG0 (*(node->input[0]))
#define DST_TVCA_OP_AMP__TRG1 (*(node->input[1]))
#define DST_TVCA_OP_AMP__TRG2 (*(node->input[2]))
#define DST_TVCA_OP_AMP__INP0 (*(node->input[3]))
#define DST_TVCA_OP_AMP__INP1 (*(node->input[4]))
static DISCRETE_STEP(dst_tvca_op_amp)
{
const discrete_op_amp_tvca_info *info = node->custom;
struct dst_tvca_op_amp_context *context = node->context;
int trig0, trig1, trig2, f3;
double i2 = 0; /* current through r2 */
double i3 = 0; /* current through r3 */
double i_neg = 0; /* current into - input */
double i_pos = 0; /* current into + input */
double i_out = 0; /* current at output */
trig0 = (int)DST_TVCA_OP_AMP__TRG0;
trig1 = (int)DST_TVCA_OP_AMP__TRG1;
trig2 = (int)DST_TVCA_OP_AMP__TRG2;
f3 = dst_trigger_function(trig0, trig1, trig2, info->f3);
if ((info->r2 != 0) && dst_trigger_function(trig0, trig1, trig2, info->f0))
{
/* r2 is present, so we assume Input 0 is connected and valid. */
i2 = (DST_TVCA_OP_AMP__INP0 - OP_AMP_NORTON_VBE) / info->r2;
if ( i2 < 0) i2 = 0;
}
if ((info->r3 != 0) && dst_trigger_function(trig0, trig1, trig2, info->f1))
{
/* r2 is present, so we assume Input 1 is connected and valid. */
/* Function F1 is not grounding the circuit. */
i3 = (DST_TVCA_OP_AMP__INP1 - OP_AMP_NORTON_VBE) / info->r3;
if ( i3 < 0) i3 = 0;
}
/* Calculate current going in to - input. */
i_neg = context->i_fixed + i2 + i3;
/* Update the c1 cap voltage. */
if (dst_trigger_function(trig0, trig1, trig2, info->f2))
{
/* F2 is not grounding the circuit so we charge the cap. */
context->v_cap1 += (context->v_trig[f3] - context->v_cap1) * context->exponent_c[f3];
}
else
{
/* F2 is at ground. The diode blocks this so F2 and r5 are out of circuit.
* So now the discharge rate is dependent upon F3.
* If F3 is at ground then we discharge to 0V through r6.
* If F3 is out of circuit then we discharge to OP_AMP_NORTON_VBE through r6+r7. */
context->v_cap1 += ((f3 ? OP_AMP_NORTON_VBE : 0.0) - context->v_cap1) * context->exponent_d[f3];
}
/* Calculate c1 current going in to + input. */
i_pos = (context->v_cap1 - OP_AMP_NORTON_VBE) / context->r67;
if ((i_pos < 0) || !f3) i_pos = 0;
/* Update the c2 cap voltage and current. */
if (info->r9 != 0)
{
f3 = dst_trigger_function(trig0, trig1, trig2, info->f4);
context->v_cap2 += ((f3 ? context->v_trig2 : 0) - context->v_cap2) * context->exponent2[f3];
i_pos += context->v_cap2 / info->r9;
}
/* Update the c3 cap voltage and current. */
if (info->r11 != 0)
{
f3 = dst_trigger_function(trig0, trig1, trig2, info->f5);
context->v_cap3 += ((f3 ? context->v_trig3 : 0) - context->v_cap3) * context->exponent3[f3];
i_pos += context->v_cap3 / info->r11;
}
/* Calculate output current. */
i_out = i_pos - i_neg;
if (i_out < 0) i_out = 0;
/* Convert to voltage for final output. */
node->output[0] = i_out * info->r4;
/* Clip the output if needed. */
if (node->output[0] > context->v_out_max) node->output[0] = context->v_out_max;
}
static DISCRETE_RESET(dst_tvca_op_amp)
{
const discrete_op_amp_tvca_info *info = node->custom;
struct dst_tvca_op_amp_context *context = node->context;
context->r67 = info->r6 + info->r7;
context->v_out_max = info->vP - OP_AMP_NORTON_VBE;
/* This is probably overkill because R5 is usually much lower then r6 or r7,
* but it is better to play it safe. */
context->v_trig[0] = (info->v1 - 0.6) * RES_VOLTAGE_DIVIDER(info->r5, info->r6);
context->v_trig[1] = (info->v1 - 0.6 - OP_AMP_NORTON_VBE) * RES_VOLTAGE_DIVIDER(info->r5, context->r67) + OP_AMP_NORTON_VBE;
context->i_fixed = context->v_out_max / info->r1;
context->v_cap1 = 0;
/* Charge rate thru r5 */
/* There can be a different charge rates depending on function F3. */
context->exponent_c[0] = RC_CHARGE_EXP(RES_2_PARALLEL(info->r5, info->r6) * info->c1);
context->exponent_c[1] = RC_CHARGE_EXP(RES_2_PARALLEL(info->r5, context->r67) * info->c1);
/* Discharge rate thru r6 + r7 */
context->exponent_d[1] = RC_CHARGE_EXP(context->r67 * info->c1);
/* Discharge rate thru r6 */
if (info->r6 != 0)
{
context->exponent_d[0] = RC_CHARGE_EXP(info->r6 * info->c1);
}
context->v_cap2 = 0;
context->v_trig2 = (info->v2 - 0.6 - OP_AMP_NORTON_VBE) * RES_VOLTAGE_DIVIDER(info->r8, info->r9);
context->exponent2[0] = RC_CHARGE_EXP(info->r9 * info->c2);
context->exponent2[1] = RC_CHARGE_EXP(RES_2_PARALLEL(info->r8, info->r9) * info->c2);
context->v_cap3 = 0;
context->v_trig3 = (info->v3 - 0.6 - OP_AMP_NORTON_VBE) * RES_VOLTAGE_DIVIDER(info->r10, info->r11);
context->exponent3[0] = RC_CHARGE_EXP(info->r11 * info->c3);
context->exponent3[1] = RC_CHARGE_EXP(RES_2_PARALLEL(info->r10, info->r11) * info->c3);
DISCRETE_STEP_CALL(dst_tvca_op_amp);
}
2004-2009 MAWS all copyrights belong to their respective owners