// license:BSD-3-Clause // copyright-holders:Fabio Priuli,Philip Bennett /***************************************************************************** MB87078 6-bit,4-channel electronic volume controller emulator *****************************************************************************/ #ifndef __MB87078_H__ #define __MB87078_H__ /*************************************************************************** DEVICE CONFIGURATION MACROS ***************************************************************************/ #define MCFG_MB87078_GAIN_CHANGED_CB(_devcb) \ devcb = &mb87078_device::set_gain_changed_callback(*device, DEVCB_##_devcb); /*************************************************************************** TYPE DEFINITIONS ***************************************************************************/ class mb87078_device : public device_t { public: mb87078_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock); ~mb87078_device() {} template static devcb_base &set_gain_changed_callback(device_t &device, _Object object) { return downcast(device).m_gain_changed_cb.set_callback(object); } void data_w(int data, int dsel); void reset_comp_w(int level); /* gain_decibel_r will return 'channel' gain on the device. Returned value represents channel gain expressed in decibels, Range from 0 to -32.0 (or -256.0 for -infinity) */ float gain_decibel_r(int channel); /* gain_percent_r will return 'channel' gain on the device. Returned value represents channel gain expressed in percents of maximum volume. Range from 100 to 0. (100 = 0dB; 50 = -6dB; 0 = -infinity) This function is designed for use with MAME mixer_xxx() functions. */ int gain_percent_r(int channel); void gain_recalc(); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; private: // internal state int m_gain[4]; /* gain index 0-63,64,65 */ int m_channel_latch; /* current channel */ UINT8 m_latch[2][4]; /* 6bit+3bit 4 data latches */ UINT8 m_reset_comp; devcb_write8 m_gain_changed_cb; }; extern const device_type MB87078; #endif /* __MB87078_H__ */