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;
}
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;
}