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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/libsnes/bsnes/snes/chip/necdsp/memory.cpp
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#ifdef NECDSP_CPP

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uint8 NECDSP::sr_read(unsigned) {

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  cpu.synchronize_coprocessors();

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  return regs.sr >> 8;

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}

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void NECDSP::sr_write(unsigned, uint8 data) {

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  cpu.synchronize_coprocessors();

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}

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uint8 NECDSP::dr_read(unsigned) {

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  cpu.synchronize_coprocessors();

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  if(regs.sr.drc == 0) {

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    //16-bit

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    if(regs.sr.drs == 0) {

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      regs.sr.drs = 1;

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      return regs.dr >> 0;

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    } else {

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      regs.sr.rqm = 0;

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      regs.sr.drs = 0;

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      return regs.dr >> 8;

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    }

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  } else {

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    //8-bit

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    regs.sr.rqm = 0;

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    return regs.dr >> 0;

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  }

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}

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void NECDSP::dr_write(unsigned, uint8 data) {

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  cpu.synchronize_coprocessors();

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  if(regs.sr.drc == 0) {

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    //16-bit

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    if(regs.sr.drs == 0) {

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      regs.sr.drs = 1;

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      regs.dr = (regs.dr & 0xff00) | (data << 0);

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    } else {

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      regs.sr.rqm = 0;

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      regs.sr.drs = 0;

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      regs.dr = (data << 8) | (regs.dr & 0x00ff);

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    }

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  } else {

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    //8-bit

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    regs.sr.rqm = 0;

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    regs.dr = (regs.dr & 0xff00) | (data << 0);

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  }

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}

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uint8 NECDSP::dp_read(unsigned addr) {

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  cpu.synchronize_coprocessors();

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  bool hi = addr & 1;

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  addr = (addr >> 1) & 2047;

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  if(hi == false) {

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    return dataRAM[addr] >> 0;

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  } else {

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    return dataRAM[addr] >> 8;

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  }

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}

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void NECDSP::dp_write(unsigned addr, uint8 data) {

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  cpu.synchronize_coprocessors();

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  bool hi = addr & 1;

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  addr = (addr >> 1) & 2047;

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  if(hi == false) {

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    dataRAM[addr] = (dataRAM[addr] & 0xff00) | (data << 0);

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  } else {

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    dataRAM[addr] = (dataRAM[addr] & 0x00ff) | (data << 8);

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  }

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}

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#endif

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