Пример #1
0
int runCPUCycle(){

	
	//Both used in DAA
	char correction;
	char beforeA;
	unsigned short beforeHL;
	char temp;
	opcodeInstruction instruction;	
	unsigned char currentInterrupts;
	
	if(delayCyclesLeft!=0){
		delayCyclesLeft--;
		return 0;
	}
	
	//Check for Interrupts
	if(IME == 1){
		currentInterrupts = (*interruptFlags)&interruptER;
		if(currentInterrupts&INT_VBLANK){
			writeSP(getSP()-2);
			writeShortToMem(getSP(),getPC());
			writePC(0x40);
			IME = 0;
			*interruptFlags = (*interruptFlags)& ~(INT_VBLANK);
		} else if(currentInterrupts&INT_LCD){
			writeSP(getSP()-2);
			writeShortToMem(getSP(),getPC());
			writePC(0x48);
			IME = 0;
			*interruptFlags = (*interruptFlags)& ~(INT_LCD);
		} else if(currentInterrupts&INT_TIMER){
			writeSP(getSP()-2);
			writeShortToMem(getSP(),getPC());
			writePC(0x50);
			IME = 0;
			*interruptFlags = (*interruptFlags)& ~(INT_TIMER);
		} else if(currentInterrupts&INT_SERIAL){
			writeSP(getSP()-2);
			writeShortToMem(getSP(),getPC());
			writePC(0x58);
			IME = 0;
			*interruptFlags = (*interruptFlags)& ~(INT_SERIAL);
		} else if(currentInterrupts&INT_JOYPAD){
			writeSP(getSP()-2);
			writeShortToMem(getSP(),getPC());
			writePC(0x60);
			IME = 0;
			*interruptFlags = (*interruptFlags)& ~(INT_JOYPAD);
		}
	}	
	
	
	delayCyclesLeft = instructionClockCycles[readCharFromMem(getPC())];	//Will be overwritten is instruction is CB
	if(delayCyclesLeft == -1){
		delayCyclesLeft = 20;	//My not need any actual implementation
	}
	
	//Add the instruction to the list of called instructions
	PCRecallAdd(PCRecallHead,getPC());

	//Get the instruction from the jump table
	if((readCharFromMem(getPC())&0xFF)==0xCB){
		instruction = opcodes[readCharFromMem(getPC()+1)+0x100];
		writePC(getPC()+1);

		incrementInstructionCount(readCharFromMem(getPC())+0x100);

		delayCyclesLeft = CBInstructionClockCycles[readCharFromMem(getPC())];
		//printf("Using CB instruction at PC: %hX\n",getPC());
	} else {
		if((readCharFromMem(getPC())&0xFF)==0x10){
			return 0x10;
		}
		//printf("Instruction Index: %hhX PC: %hX\n",readCharFromMem(getPC()),getPC());

		incrementInstructionCount(readCharFromMem(getPC()));

		instruction = opcodes[readCharFromMem(getPC())];
	}
	//Call the instruction
	if(instruction!=0){
		instruction();
	} else {
		printf("Unknown Instruction: %hhX at PC: %hhX\n",readCharFromMem(getPC()),getPC());
		return 0x10;	//Stop
		writePC(getPC()+1);
	}	
	
	return 0;
}	
Пример #2
0
int main(int argc, char * argv[]){
	WINDOW * win;
	initscr();
	clear();
	noecho();
	cbreak();
	curs_set(0);

	m = newMachine();
	if(argc == 2){
		loadMachine(m,argv[1]);
	}

	win = newwin(WINDOW_SIZE_HEIGHT,WINDOW_SIZE_WIDTH,2,2);
	keypad(win,TRUE);
	refresh();
	createDefaultView(win);
	updateView(win);

	char read;
	int c = 0;
	while(c!='q'){
		c = wgetch(win);
		switch(c){
			// all these if statements are just edge cases where we wrap around
			// the table
			case KEY_UP:
				if(section == SECTION_MEMORY){
					if(highlight[section] < 16) highlight[section] = 255 - (15 - highlight[section]);
					else highlight[section]-=16;
				}
				break;
			case KEY_DOWN:
				if(section == SECTION_MEMORY){
					if(highlight[section] < 256 && highlight[section] >= 240) highlight[section] = highlight[section] - 16*15;
					else highlight[section]+=16;
				}
				break;
			case KEY_LEFT:
				if(section == SECTION_MEMORY){
					if(highlight[section]%16==0) highlight[section] += 15;
					else highlight[section]--;
				}else if(section == SECTION_REGISTERS){
					if(highlight[section] == 0) highlight[section] = 15;
					else highlight[section]--;
				}
				break;
			case KEY_RIGHT:
				if(section == SECTION_MEMORY){
					if((highlight[section]-15) % 16 ==0 ) highlight[section] -= 15;
					else highlight[section]++;
				}else if(section == SECTION_REGISTERS){
					if(highlight[section] == 15) highlight[section] = 0;
					else highlight[section]++;
				}
				break;

			// tab key
			case 9:
				// toggle section
				section++;
				section = section%3;
				break;

			case 'r':
				run(m);
				break;

			case 's':
				saveMachine(m);
				break;

			case 'c':
				resetMachine(m);
				break;

			// enter key
			case 10:
				read = readInput(win);
				if(section == SECTION_MEMORY) writeMemoryAt(m, highlight[section], read);
				else if(section == SECTION_REGISTERS) writeRegistersAt(m, highlight[section], read);
				else writePC(m, read);
				break;

			case 'n':
				step(m);
				break;

			default:
				refresh();
				break;
		}
		updateView(win);
	}

	clrtoeol();
	refresh();
	endwin();
	return 0;
}