bsnes-bsx

//satellaview.cpp

#ifdef BSX_CPP

BSXSatellaview bsxsatellaview;

void BSXSatellaview::init() {
}

void BSXSatellaview::load() {
  bus.map(Bus::MapMode::Direct, 0x00, 0x3f, 0x2188, 0x219f, { &BSXSatellaview::mmio_read, &bsxsatellaview }, { &BSXSatellaview::mmio_write, &bsxsatellaview });
  bus.map(Bus::MapMode::Direct, 0x80, 0xbf, 0x2188, 0x219f, { &BSXSatellaview::mmio_read, &bsxsatellaview }, { &BSXSatellaview::mmio_write, &bsxsatellaview });

  BSX1.open("BSX1.bin", file::mode::read);
  BSX2.open("BSX2.bin", file::mode::read);

  if (BSX1.size() != -1) bsxf.BS1 = true;
  else bsxf.BS1 = false;
  if (BSX2.size() != -1) bsxf.BS2 = true;
  else bsxf.BS2 = false;
}

void BSXSatellaview::unload() {
    BSX1.close();
    BSX2.close();
    bsxf.BS1 = false;
    bsxf.BS2 = false;
}

void BSXSatellaview::power() {
  reset();
}

void BSXSatellaview::reset() {
  memset(&regs, 0x00, sizeof regs);
}

uint8 BSXSatellaview::mmio_read(unsigned addr) {
  addr &= 0xffff;

  switch(addr) {
    case 0x2188: return regs.r2188;
    case 0x2189: return regs.r2189;
    case 0x218a: {
        return BSX1.size();
        //return regs.r218a;
    }

    case 0x218b: {
        if(regs.r218b_port) {
            if (bsxf.BS1) {
                return BSX1.read();
            }
            else return 0x01;
        }
        else return 0x00;
    }
    case 0x218c: {
        if(regs.r218c_port) {
            if (bsxf.BS2) {
                return BSX2.read();
            }
            else return 0x01;
        }
        else return 0x00;
    }
    case 0x218d: {
        return 0x10;
    }
    case 0x218e: return regs.r218e;
    case 0x218f: return regs.r218f;
    case 0x2190: return regs.r2190;

    case 0x2192: {
      if(regs.r2192_port) {
        unsigned counter = regs.r2192_counter++;
        if(regs.r2192_counter >= 18) regs.r2192_counter = 0;

        if(counter == 0) {
            time_t rawtime;
            time(&rawtime);
            tm *t = localtime(&rawtime);

            regs.r2192_hour   = t->tm_hour;
            regs.r2192_minute = t->tm_min;
            regs.r2192_second = t->tm_sec;
        }

        switch(counter) {
            case  0: return 0x00;  //???
            case  1: return 0x00;  //???
            case  2: return 0x00;  //???
            case  3: return 0x00;  //???
            case  4: return 0x00;  //???
            case  5: return 0x01;
            case  6: return 0x01;
            case  7: return 0x00;
            case  8: return 0x00;
            case  9: return 0x00;
            case 10: return regs.r2192_second;
            case 11: return regs.r2192_minute;
            case 12: return regs.r2192_hour;
            case 13: return 0x00;  //???
            case 14: return 0x00;  //???
            case 15: return 0x00;  //???
            case 16: return 0x00;  //???
            case 17: return 0x00;  //???
        }
      }
      else return 0x00;
    } break;

    case 0x2193: return regs.r2193 & ~0x0c;
    case 0x2194: return regs.r2194;
    case 0x2196: return regs.r2196;
    case 0x2197: return regs.r2197;
    case 0x2199: return regs.r2199;
  }

  return cpu.regs.mdr;
}

void BSXSatellaview::mmio_write(unsigned addr, uint8 data) {
  addr &= 0xffff;

  switch(addr) {
    case 0x2188: {
      regs.r2188 = data;
    } break;

    case 0x2189: {
      regs.r2189 = data;
    } break;

    case 0x218a: {
      regs.r218a = data;
    } break;

    case 0x218b: {
      if (data && 1 == 1) {
        regs.r218b_port=true;
        BSX1.seek(0);
      }
      else regs.r218b_port=false;
      //regs.r218b = data;
    } break;

    case 0x218c: {
      if (data && 1 == 1) {
        regs.r218c_port=true;
        BSX2.seek(0);
      }
      else regs.r218c_port=false;
      //regs.r218c = data;
    } break;

    case 0x218e: {
      regs.r218e = data;
    } break;

    case 0x218f: {
      regs.r218e >>= 1;
      regs.r218e = regs.r218f - regs.r218e;
      regs.r218f >>= 1;
    } break;

    case 0x2191: {
      if (data && 1 == 1) regs.r2191_port=true;
      else regs.r2191_port=false;
      //regs.r2191 = data;
      regs.r2192_counter = 0;
    } break;

    case 0x2192: {
      if (data && 1 == 1) regs.r2192_port=true;
      else regs.r2192_port=false;
      regs.r2190 = 0x80;
    } break;

    case 0x2193: {
      regs.r2193 = data;
    } break;

    case 0x2194: {
      regs.r2194 = data;
    } break;

    case 0x2197: {
      regs.r2197 = data;
    } break;

    case 0x2199: {
      regs.r2199 = data;
    } break;
  }
}

#endif


//satellaview.hpp

#include <nall/file.hpp>

class BSXSatellaview {
public:
  void init();
  void load();
  void unload();
  void power();
  void reset();

  file BSX1, BSX2;

  uint8 mmio_read(unsigned addr);
  void mmio_write(unsigned addr, uint8 data);

private:
  struct {
    uint8 r2188, r2189, r218a, r218b;
    uint8 r218c, r218d, r218e, r218f;
    uint8 r2190, r2191, r2192, r2193;
    uint8 r2194, r2195, r2196, r2197;
    uint8 r2198, r2199, r219a, r219b;
    uint8 r219c, r219d, r219e, r219f;

    uint8 r2192_counter;
    uint8 r2192_hour, r2192_minute, r2192_second;

    bool r218b_port, r218c_port;
    bool r2191_port, r2192_port;
  } regs;
  struct {
    bool BS1, BS2;
  } bsxf;
};

extern BSXSatellaview bsxsatellaview;