diff options
Diffstat (limited to 'src/devices/sound/va_eg.h')
| -rw-r--r-- | src/devices/sound/va_eg.h | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/src/devices/sound/va_eg.h b/src/devices/sound/va_eg.h index 16e19303c18..65f2d968d50 100644 --- a/src/devices/sound/va_eg.h +++ b/src/devices/sound/va_eg.h @@ -7,8 +7,6 @@ #pragma once DECLARE_DEVICE_TYPE(VA_RC_EG, va_rc_eg_device) -DECLARE_DEVICE_TYPE(CEM3310, cem3310_device) - // Building block for emulating envelope generators (EGs) based on a single RC // circuit. The controlling source sets a target voltage and the device @@ -79,69 +77,4 @@ private: attotime m_t_end_approx; }; - -// Emulates a CEM3310 envelope generator. -// The rate CVs (attack, decay, release) are usually negative voltages. -// The sustain CV is a positive voltage, usually 0-5V. -// The output stream contains voltages, usually 0-5V. -// -// The emulation is accurate for the typical configuration. The behavior for -// less common configurations (e.g. sustain voltage above 5V, independent gate -// and trigger signals) is not yet emulated. The longer version of the datasheet -// has relevant info. -class cem3310_device : public device_t, public device_sound_interface -{ -public: - // rx - Resistor Rx connecting pin 10 (Iin) and pin 2 (ENV Out). - // cx - Capacitor Cx at pin 1 (Cap). - cem3310_device(const machine_config &mconfig, const char *tag, device_t *owner, float rx, float cx) ATTR_COLD; - cem3310_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) ATTR_COLD; - - void attack_w(float cv); - void decay_w(float cv); - void sustain_w(float cv); - void release_w(float cv); - - // Assumes the trigger pin is connected to the gate pin via a capacitor. - // Independent control of the trigger input is not yet emulated. - void gate_w(int state); - -protected: - void device_add_mconfig(machine_config &config) override ATTR_COLD; - void device_start() override ATTR_COLD; - void device_reset() override ATTR_COLD; - void sound_stream_update(sound_stream &stream) override; - -private: - void update_rc(); - TIMER_CALLBACK_MEMBER(attack_timer_tick); - - enum phase - { - PHASE_ATTACK = 0, - PHASE_DECAY, - PHASE_RELEASE - }; - - // Using the constant names in the datasheet. - static inline constexpr float VP = 5.0F; // Envelope peak voltage. - static inline constexpr float VZ = 6.5F; // Attack asymptote voltage (voltage target). - static inline constexpr float VT = 0.026F; // Thermal voltage at room temperature. - - const float m_rx; - const float m_cx; - - sound_stream *m_stream; - emu_timer *m_attack_timer; - - required_device<va_rc_eg_device> m_rc; - - s8 m_phase; - bool m_gate; - float m_attack_cv; - float m_decay_cv; - float m_sustain_cv; - float m_release_cv; -}; - #endif // MAME_SOUND_VA_EG_H |
