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121 lines
3.1 KiB
121 lines
3.1 KiB
/*
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SID.h - Atmega8 MOS6581 SID Emulator
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Copyright (c) 2007 Christoph Haberer, christoph(at)roboterclub-freiburg.de
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Arduino Library Conversion by Mario Patino, cybernesto(at)gmail.com
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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// ensure this library description is only included once
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#ifndef SID_h
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#define SID_h
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#include <inttypes.h>
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#define NUMREGISTERS 29
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#define OSCILLATORS 3
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#define MAXLEVEL ( 0xFFFF / OSCILLATORS )
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#define SUSTAINFACTOR ( MAXLEVEL / 15 )
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#define SAMPLEFREQ 16000L
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#define SAMPLERATECOUNT (F_CPU/(8*SAMPLEFREQ)-1)
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#define ENVELOPE_FREQ 1000L
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#define MSCOUNT (SAMPLEFREQ/ENVELOPE_FREQ-1)
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// SID Registers
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#define VOICE1 0
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#define VOICE2 7
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#define VOICE3 14
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#define CONTROLREG 4
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#define ATTACKDECAY 5
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#define SUSTAINRELEASE 6
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// SID voice control register bits
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#define GATE (1<<0)
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#define SYNC (1<<1)
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#define RINGMOD (1<<2)
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#define TEST (1<<3) // not implemented
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#define TRIANGLE (1<<4)
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#define SAWTOOTH (1<<5)
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#define RECTANGLE (1<<6)
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#define NOISE (1<<7)
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// SID RES/FILT ( reg.23 )
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#define FILT1 (1<<0)
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#define FILT2 (1<<1)
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#define FILT3 (1<<2)
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// SID MODE/VOL ( reg.24 )
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#define VOICE3OFF (1<<7)
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typedef struct
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{
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uint16_t Freq; // Frequency: FreqLo/FreqHi
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uint16_t PW; // PulseWidth: PW LO/HI only 12 bits used in SID
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uint8_t ControlReg; // NOISE,RECTANGLE,SAWTOOTH,TRIANGLE,TEST,RINGMOD,SYNC,GATE
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uint8_t AttackDecay; // bit0-3 decay, bit4-7 attack
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uint8_t SustainRelease; // bit0-3 release, bit4-7 sustain
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} Voice_t;
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typedef struct
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{
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Voice_t voice[3];
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uint16_t FC; // not implemented
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uint8_t RES_Filt; // partly implemented
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uint8_t Mode_Vol; // partly implemented
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uint8_t POTX; // not implemented
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uint8_t POTY; // not implemented
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uint8_t OSC3_Random;// not implemented
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uint8_t ENV3; // not implemented
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} Blocks_t;
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typedef union
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{
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Blocks_t block;
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uint8_t sidregister[NUMREGISTERS];
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} Sid_t;
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typedef struct
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{
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uint16_t freq_coefficient;
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uint8_t envelope;
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uint16_t m_attack;
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uint16_t m_decay;
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uint16_t m_release;
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uint8_t attackdecay_flag;
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int16_t level_sustain;
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int16_t amp;
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} Oscillator_t;
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// library interface description
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class SID
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{
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// user-accessible "public" interface
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public:
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void begin();
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uint8_t set_register(uint8_t regnum, uint8_t value);
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uint8_t get_register(uint8_t regnum);
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// library-accessible "private" interface
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private:
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uint8_t get_wavenum(Voice_t *voice);
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void setfreq(Voice_t *voice,uint16_t freq);
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void init_waveform(Voice_t *voice);
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void setenvelope(Voice_t *voice);
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};
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#endif
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