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// NES MMC5 sound chip emulator
// Nes_Snd_Emu 0.2.0-pre
#ifndef NES_MMC5_APU_H
#define NES_MMC5_APU_H
#include "blargg_common.h"
#include "Nes_Apu.h"
class Nes_Mmc5_Apu : public Nes_Apu {
public:
enum { regs_addr = 0x5000 };
enum { regs_size = 0x16 };
enum { osc_count = 3 };
void write_register( blip_time_t, unsigned addr, int data );
void set_output( Blip_Buffer* );
void set_output( int index, Blip_Buffer* );
enum { exram_size = 1024 };
unsigned char exram [exram_size];
BLARGG_DEPRECATED_TEXT( enum { start_addr = 0x5000 }; )
BLARGG_DEPRECATED_TEXT( enum { end_addr = 0x5015 }; )
};
inline void Nes_Mmc5_Apu::set_output( int i, Blip_Buffer* b )
{
// in: square 1, square 2, PCM
// out: square 1, square 2, skipped, skipped, PCM
if ( i > 1 )
i += 2;
Nes_Apu::set_output( i, b );
}
inline void Nes_Mmc5_Apu::set_output( Blip_Buffer* b )
{
set_output( 0, b );
set_output( 1, b );
set_output( 2, b );
}
inline void Nes_Mmc5_Apu::write_register( blip_time_t time, unsigned addr, int data )
{
switch ( addr )
{
case 0x5015: // channel enables
data &= 0x03; // enable the square waves only
// fall through
case 0x5000: // Square 1
case 0x5002:
case 0x5003:
case 0x5004: // Square 2
case 0x5006:
case 0x5007:
case 0x5011: // DAC
Nes_Apu::write_register( time, addr - 0x1000, data );
break;
case 0x5010: // some things write to this for some reason
break;
#ifdef BLARGG_DEBUG_H
default:
dprintf( "Unmapped MMC5 APU write: $%04X <- $%02X\n", addr, data );
#endif
}
}
#endif
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