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// Super Nintendo (SNES) SPC-700 CPU emulator
// Game_Music_Emu 0.5.2
#ifndef SPC_CPU_H
#define SPC_CPU_H
#include "blargg_common.h"
typedef unsigned spc_addr_t;
typedef blargg_long spc_time_t;
class Snes_Spc;
class Spc_Cpu {
typedef BOOST::uint8_t uint8_t;
uint8_t* const ram;
public:
// Keeps pointer to 64K RAM
Spc_Cpu( Snes_Spc* spc, uint8_t* ram );
// SPC-700 registers. *Not* kept updated during a call to run().
struct registers_t {
long pc; // more than 16 bits to allow overflow detection
uint8_t a;
uint8_t x;
uint8_t y;
uint8_t status;
uint8_t sp;
} r;
// Run CPU for at least 'count' cycles. Return the number of cycles remaining
// when emulation stopped (negative if extra cycles were emulated). Emulation
// stops when there are no more remaining cycles or an unhandled instruction
// is encountered (STOP, SLEEP, and any others not yet implemented). In the
// latter case, the return value is greater than zero.
spc_time_t run( spc_time_t count );
// Number of clock cycles remaining for current run() call
spc_time_t remain() const;
// Access memory as the emulated CPU does
int read ( spc_addr_t );
void write( spc_addr_t, int );
private:
// noncopyable
Spc_Cpu( const Spc_Cpu& );
Spc_Cpu& operator = ( const Spc_Cpu& );
unsigned mem_bit( spc_addr_t );
spc_time_t remain_;
Snes_Spc& emu;
};
inline spc_time_t Spc_Cpu::remain() const { return remain_; }
#endif
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