pacman.ino

/**
   http://www.frisnit.com/pac-man-machine-emulator/
   https://github.com/frisnit/pacman-emulator
   https://github.com/jscrane/pacman
*/
#include <stdarg.h>
#include <SPI.h>
#include "r65emu.h"
#include "ports.h"
#include "z80.h"

#include "config.h"
#include "display.h"
#include "io.h"

static uint8_t irq;

class IOPorts: public PortDevice<z80> {
  public:
    uint8_t in(uint16_t p, z80 *cpu) {
      return 0;
    }

    void out(uint16_t p, uint8_t b, z80 *cpu) {
      if ((p & 0xff) == 0x0000)
        irq = b;
    }
} ports;

z80 cpu(memory, ports);
ram pages[2];

#include "roms/rom6e.h"
#include "roms/rom6f.h"
#include "roms/rom6h.h"
#include "roms/rom6j.h"

prom e6(rom6e, sizeof(rom6e));
prom f6(rom6f, sizeof(rom6f));
prom h6(rom6h, sizeof(rom6h));
prom j6(rom6j, sizeof(rom6j));

Display display(memory);
IO io(memory);

void reset(void) {
  hardware_reset();
  display.begin();
  io.init();
}

void setup(void) {
  hardware_init(cpu);

  memory.put(e6, 0x0000);
  memory.put(f6, 0x1000);
  memory.put(h6, 0x2000);
  memory.put(j6, 0x3000);

  memory.put(display, 0x4000);
  memory.put(pages[0], 0x4800);
  memory.put(pages[1], 0x4c00);
  memory.put(io, 0x5000);

  reset();
}

void loop(void) {
  io.scan();
  cpu.run(1000);
  if (cpu.ts() > 51200) { // run for 51200 clock cycles (1/60 second @ 3.072 MHz)
    cpu.reset_ts();
    if (io.int_enabled()) {
      cpu.raise(irq);
      display.clear();      
      display.renderTiles();      
      display.renderSprites(io);      
      display.flush();      
    }
  } 
}