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