daily_automated

trunk/Arduino/libraries/SID/SID.h

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+/*
+ 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 <inttypes.h>
+
+#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
+