void dsd_555_mstbl_reset(node_description *node)
{
const discrete_555_desc *info = node->custom;
struct dsd_555_mstbl_context *context = node->context;
context->output_type = info->options & DISC_555_OUT_MASK;
if ((context->output_type == DISC_555_OUT_COUNT_F) || (context->output_type == DISC_555_OUT_COUNT_R))
{
discrete_log("Invalid Output type in NODE_%d.\n", node->node - NODE_00);
context->output_type = DISC_555_OUT_SQW;
}
/* Use the supplied values or set to defaults. */
context->threshold = (info->threshold555 == DEFAULT_555_THRESHOLD) ? info->v555 *2 /3 : info->threshold555;
context->trigger = (info->trigger555 == DEFAULT_555_TRIGGER) ? info->v555 /3 : info->trigger555;
context->output_high_voltage = (info->v555high == DEFAULT_555_HIGH) ? info->v555 - 1.2 : info->v555high;
context->output_is_ac = info->options & DISC_555_OUT_AC;
/* Calculate DC shift needed to make squarewave waveform AC */
context->ac_shift = context->output_is_ac ? -context->output_high_voltage / 2.0 : 0;
context->error = test_555(context->threshold, context->trigger, info->v555, node->node);
context->trig_is_logic = (info->options & DISC_555_TRIGGER_IS_VOLTAGE) ? 0: 1;
context->flip_flop = 0;
context->cap_voltage = 0;
node->output = 0;
}
void dsd_555_astbl_reset(struct node_description *node)
{
const struct discrete_555_desc *info = node->custom;
struct dsd_555_astbl_context *context = node->context;
context->use_ctrlv = (node->input_is_node >> 4) & 1;
context->wav_type = info->options & DISC_555_OUT_MASK;
/* Use the supplied values or set to defaults. */
context->vHigh = (info->v555high == DEFAULT_555_HIGH) ? info->v555 - 1.2 : info->v555high;
if ((DSD_555_ASTBL__CTRLV != -1) && !context->use_ctrlv)
{
/* Setup based on supplied static value */
context->threshold = DSD_555_ASTBL__CTRLV;
context->trigger = DSD_555_ASTBL__CTRLV / 2.0;
}
else
{
/* use values passed in structure */
context->threshold = (info->threshold555 == DEFAULT_555_THRESHOLD) ? info->v555 *2 /3 : info->threshold555;
context->trigger = (info->trigger555 == DEFAULT_555_TRIGGER) ? info->v555 /3 : info->trigger555;
}
context->is_ac = info->options & DISC_555_OUT_AC;
/* Calculate DC shift needed to make squarewave waveform AC */
context->ac_shift = context->is_ac ? -context->vHigh / 2.0 : 0;
context->error = test_555(context->threshold, context->trigger, info->v555, node->node);
context->v555 = (info->options & DISC_555_ASTABLE_HAS_FAST_CHARGE_DIODE) ? info->v555 - 0.5: info->v555;
context->flip_flop = 1;
context->vCap = 0;
context->step = 1.0 / Machine->sample_rate;
/* Used to adjust the ratio depending on if it is the extra percent or energy */
context->x_init = 0;
if (context->wav_type == DISC_555_OUT_ENERGY)
context->x_init = context->step;
/* Step to set the output */
dsd_555_astbl_step(node);
}
void dsd_555_cc_reset(node_description *node)
{
const discrete_555_cc_desc *info = node->custom;
struct dsd_555_cc_context *context = node->context;
context->flip_flop=1;
context->cap_voltage = 0;
context->output_type = info->options & DISC_555_OUT_MASK;
/* Used to adjust the ratio depending on if it is the extra percent or energy */
context->x_init = 0;
if (context->output_type == DISC_555_OUT_ENERGY)
context->x_init = discrete_current_context->sample_time;
/* Use the supplied values or set to defaults. */
context->threshold = (info->threshold555 == DEFAULT_555_THRESHOLD) ? info->v555 *2 /3 : info->threshold555;
context->trigger = (info->trigger555 == DEFAULT_555_TRIGGER) ? info->v555 /3 : info->trigger555;
context->output_high_voltage = (info->v555high == DEFAULT_555_HIGH) ? info->v555 - 1.2 : info->v555high;
context->output_is_ac = info->options & DISC_555_OUT_AC;
/* Calculate DC shift needed to make squarewave waveform AC */
context->ac_shift = context->output_is_ac ? -context->output_high_voltage / 2.0 : 0;
context->error = test_555(context->threshold, context->trigger, info->v555, node->node);
/* There are 8 different types of basic oscillators
* depending on the resistors used. We will determine
* the type of circuit at reset, because the ciruit type
* is constant. */
context->type = (DSD_555_CC__RDIS > 0) | ((DSD_555_CC__RGND > 0) << 1) | ((DSD_555_CC__RBIAS > 0) << 2);
/*
* TYPES:
* Note: These are equivalent circuits shown without the 555 circuitry.
* See the schematic in src\sound\discrete.h for full hookup info.
*
* DISCRETE_555_CC_TO_DISCHARGE_PIN
* When the CC source is connected to the discharge pin, it allows the
* circuit to charge when the 555 is in charge mode. But when in discharge
* mode, the CC source is grounded, disabling it's effect.
*
* [0]
* No resistors. Straight constant current charge of capacitor.
* When there is not any charge current, the cap will bleed off.
* Once the lower threshold(trigger) is reached, the output will
* go high but the cap will continue to discharge due to losses.
* .------+---> cap_voltage CHARGING:
* | | dv (change in voltage) compared to dt (change in time in seconds).
* .---. --- dv = i * dt / C; where i is current in amps and C is capacitance in farads.
* | i | --- C cap_voltage = cap_voltage + dv
* '---' |
* | | DISCHARGING:
* gnd gnd instantaneous
*
* [1]
* Same as type 1 but with rDischarge. rDischarge has no effect on the charge rate because
* of the constant current source i.
* When there is not any charge current, the cap will bleed off.
* Once the lower threshold(trigger) is reached, the output will
* go high but the cap will continue to discharge due to losses.
* .----ZZZ-----+---> cap_voltage CHARGING:
* | rDischarge | dv (change in voltage) compared to dt (change in time in seconds).
* .---. --- dv = i * dt / C; where i is current in amps and C is capacitance in farads.
* | i | --- C cap_voltage = cap_voltage + dv
* '---' |
* | | DISCHARGING:
* gnd gnd thru rDischarge
*
* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
* !!!!! IMPORTANT NOTE ABOUT TYPES 3 - 7 !!!!!
* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
*
* From here on in all the circuits have either an rBias or rGnd resistor.
* This converts the constant current into a voltage source.
* So all the remaining circuit types will be converted to this circuit.
* When discharging, rBias is out of the equation because the 555 is grounding the circuit
* after that point.
*
* .------------. Rc Rc is the equivilent circuit resistance.
* | v |----ZZZZ---+---> cap_voltage v is the equivilent circuit voltage.
* | | |
* '------------' --- Then the standard RC charging formula applies.
* | --- C
* | | NOTE: All the following types are converted to Rc and v values.
* gnd gnd
*
* [2]
* When there is not any charge current, the cap will bleed off.
* Once the lower threshold(trigger) is reached, the output will
* go high but the cap will continue to discharge due to rGnd.
* .-------+------+------> cap_voltage CHARGING:
* | | | v = vi = i * rGnd
* .---. --- Z Rc = rGnd
* | i | --- C Z rGnd
* '---' | | DISCHARGING:
* | | | instantaneous
* gnd gnd gnd
*
* [3]
* When there is not any charge current, the cap will bleed off.
* Once the lower threshold(trigger) is reached, the output will
* go high but the cap will continue to discharge due to rGnd.
* .----ZZZ-----+------+------> cap_voltage CHARGING:
* | rDischarge | | v = vi = i * rGnd
* .---. --- Z Rc = rGnd
* | i | --- C Z rGnd
* '---' | | DISCHARGING:
* | | | thru rDischarge || rGnd ( || means in parallel)
* gnd gnd gnd
*
* [4]
* .---ZZZ---+------------+-------------> cap_voltage CHARGING:
* | rBias | | Rc = rBias
* .-------. .---. --- vi = i * rBias
* | vBias | | i | --- C v = vBias + vi
* '-------' '---' |
* | | | DISCHARGING:
* gnd gnd gnd instantaneous
*
* [5]
* .---ZZZ---+----ZZZ-----+-------------> cap_voltage CHARGING:
* | rBias | rDischarge | Rc = rBias + rDischarge
* .-------. .---. --- vi = i * rBias
* | vBias | | i | --- C v = vBias + vi
* '-------' '---' |
* | | | DISCHARGING:
* gnd gnd gnd thru rDischarge
*
* [6]
* .---ZZZ---+------------+------+------> cap_voltage CHARGING:
* | rBias | | | Rc = rBias || rGnd
* .-------. .---. --- Z vi = i * Rc
* | vBias | | i | --- C Z rGnd v = vBias * (rGnd / (rBias + rGnd)) + vi
* '-------' '---' | |
* | | | | DISCHARGING:
* gnd gnd gnd gnd instantaneous
*
* [7]
* .---ZZZ---+----ZZZ-----+------+------> cap_voltage CHARGING:
* | rBias | rDischarge | | Rc = (rBias + rDischarge) || rGnd
* .-------. .---. --- Z vi = i * rBias * (rGnd / (rBias + rDischarge + rGnd))
* | vBias | | i | --- C Z rGnd v = vBias * (rGnd / (rBias + rDischarge + rGnd)) + vi
* '-------' '---' | |
* | | | | DISCHARGING:
* gnd gnd gnd gnd thru rDischarge || rGnd
*/
/*
* DISCRETE_555_CC_TO_CAP
*
* When the CC source is connected to the capacitor, it allows the
* current to charge the cap while it is in discharge mode, slowing the
* discharge. So in charge mode it charges linearly from the constant
* current cource. But when in discharge mode it behaves like circuit
* type 2 above.
* .-------+------+------> cap_voltage CHARGING:
* | | | dv = i * dt / C
* .---. --- Z cap_voltage = cap_voltage + dv
* | i | --- C Z rDischarge
* '---' | | DISCHARGING:
* | | | v = vi = i * rGnd
* gnd gnd discharge Rc = rDischarge
*/
/* Step to set the output */
dsd_555_cc_step(node);
}