2025-01-29 01:58:31 -05:00
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// license:BSD-3-Clause
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// copyright-holders:Wilbert Pol
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/**********************************************************************
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NEC uPD1771
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**********************************************************************/
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#ifndef MAME_SOUND_UPD1771_H
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#define MAME_SOUND_UPD1771_H
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#include <stdint.h>
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/***************************************************************************
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MACROS / CONSTANTS
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***************************************************************************/
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class upd1771c_device
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{
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public:
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uint8_t read();
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void write(uint8_t data);
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void pcm_write(int state);
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// device-level overrides
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void device_reset();
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// sound stream update overrides
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void sound_stream_update(short* output, int len);
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2025-01-29 04:10:54 -05:00
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short chout[4];
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2025-01-29 01:58:31 -05:00
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private:
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static constexpr unsigned MAX_PACKET_SIZE = 0x8000;
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// internal state
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uint8_t m_packet[MAX_PACKET_SIZE];
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uint32_t m_index;
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uint8_t m_expected_bytes;
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uint8_t m_state;//0:silence, 1 noise, 2 tone
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uint8_t m_pc3;
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//tone
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uint8_t m_t_timbre; //[0; 7]
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uint8_t m_t_offset; //[0; 32]
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uint16_t m_t_period; //[0;255]
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uint8_t m_t_volume; //[0; 31]
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uint8_t m_t_tpos;//timbre pos
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uint16_t m_t_ppos;//period pos
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//noise wavetable LFSR
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uint8_t m_nw_timbre; //[0; 7]
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uint8_t m_nw_volume; //[0; 31]
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uint32_t m_nw_period;
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uint32_t m_nw_tpos; //timbre pos
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uint32_t m_nw_ppos; //period pos
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//noise pulse components
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uint8_t m_n_value[3]; //[0;1]
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uint16_t m_n_volume[3]; //[0; 31]
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uint32_t m_n_period[3];
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uint32_t m_n_ppos[3]; //period pos
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};
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#endif // MAME_SOUND_UPD1771_H
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