mirror of https://github.com/JorjBauer/aiie.git
77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
#ifndef __AY8910_H
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#define __AY8910_H
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#include <stdint.h>
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#include "lcg.h"
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// Operations...
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enum {
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IAB = 0,
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DTB = 1,
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DWS = 2,
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INTAK = 3,
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NRSET = 4
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};
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// Registers...
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enum {
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CHAN_A_FINE = 0,
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CHAN_A_COARSE = 1,
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CHAN_B_FINE = 2,
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CHAN_B_COARSE = 3,
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CHAN_C_FINE = 4,
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CHAN_C_COARSE = 5,
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NOISE_PERIOD = 6,
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ENAB = 7,
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CHAN_A_AMP = 8,
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CHAN_B_AMP = 9,
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CHAN_C_AMP = 10,
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ENV_PERIOD_FINE = 11,
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ENV_PERIOD_COARSE = 12,
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ENV_SHAPE = 13
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};
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// Enable flags (all negative; enabled-low)
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enum {
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ENAB_N_TONEA = 1,
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ENAB_N_TONEB = 2,
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ENAB_N_TONEC = 4,
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ENAB_N_NOISEA = 8,
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ENAB_N_NOISEB = 16,
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ENAB_N_NOISEC = 32
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};
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class AY8910 {
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public:
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AY8910();
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void Reset();
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uint8_t read(uint8_t reg);
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void write(uint8_t reg, uint8_t PortA);
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void update(uint32_t cpuCycleCount);
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protected:
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uint16_t cycleTimeForPSG(uint8_t psg);
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uint16_t cycleTimeForNoise();
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uint32_t calculateEnvelopeTime();
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private:
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uint8_t curRegister;
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uint8_t r[16];
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uint16_t cycleTime[3]; // how long each cycle will last, in clock cycles
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uint32_t waveformFlipTimer[3]; // when we're going to flip next
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uint8_t outputState[3];
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int8_t envCounter; // which bit of the waveform the envelope is on
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int8_t envDirection;
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uint32_t envelopeTime;
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uint32_t envelopeTimer;
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uint32_t noiseFlipTimer;
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bool noiseFlag;
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LCG lcg;
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};
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#endif
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