lauchmelder/NESEmulator
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added logging

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This commit is contained in:
Lauchmelder 2021-10-22 17:49:20 +02:00
parent 0f62079193
commit f872e19707
6 changed files with 341 additions and 268 deletions
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31
NES Emulator/cpu.c
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@ -2,6 +2,7 @@
#include <stdlib.h>
#include <stdio.h>
#include "log.h"
#include "bus.h"
struct CPU* createCPU(struct Bus* parent)
@ -16,6 +17,14 @@ struct CPU* createCPU(struct Bus* parent)
// TODO: THIS IS JUST FOR THE TEST ROM
cpu->pc = 0xC000;
cpu->status.raw = 0x34;
cpu->acc = 0;
cpu->x = 0;
cpu->y = 0;
cpu->remainingCycles = 7;
cpu->totalCycles = 0;
cpu->bus = parent;
return cpu;
}
@ -25,27 +34,29 @@ void destroyCPU(struct CPU* cpu)
free(cpu);
}
void tickCPU(struct CPU* cpu)
int tickCPU(struct CPU* cpu)
{
if (cpu->fetchedVal != 0)
cpu->remainingCycles--;
cpu->totalCycles += 1;
if (cpu->remainingCycles == 0)
{
cpu->fetchedVal--;
return;
fetch(cpu);
execute(cpu);
return 1;
}
fetch(cpu);
execute(cpu);
return 0;
}
void tickInstr(struct CPU* cpu)
{
while (cpu->remainingCycles > 1)
tickCPU(cpu);
while (!tickCPU(cpu));
}
void fetch(struct CPU* cpu)
{
Byte opcodeVal = readBus(cpu->bus, cpu->pc);
Byte opcodeVal = readBus(cpu->bus, cpu->pc++);
cpu->currentOpcode = OPCODE_TABLE + opcodeVal;
if (cpu->currentOpcode->op == XXX)
@ -164,6 +175,8 @@ void fetch(struct CPU* cpu)
void execute(struct CPU* cpu)
{
LOG_BUS(cpu->bus);
switch (cpu->currentOpcode->op)
{
case JMP: