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added addressing modes

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This commit is contained in:
Lauchmelder 2021-10-22 16:39:48 +02:00
parent 458500bd59
commit 0f62079193
3 changed files with 364 additions and 108 deletions
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19
NES Emulator/cpu.h
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@ -5,7 +5,7 @@
struct Bus;
typedef enum
enum Operation
{
XXX = 0,
ADC, AND, ASL, BCC, BCS, BEQ, BIT, BMI,
@ -15,23 +15,23 @@ typedef enum
LSR, NOP, ORA, PHA, PHP, PLA, PLP, ROL,
ROR, RTI, RTS, SBC, SEC, SED, SEI, STA,
STX, STY, TAX, TAY, TSX, TXA, TXS, TYA
} Operation;
};
typedef enum
enum AddrMode
{
ACC, ABS, ABX, ABY, IMM, IMP, IND, XIN, INY, REL, ZPG, ZPX, ZPY
} AddrMode;
ACC, ABS, ABX, ABY, IMM, IMP, IND, INDX, INDY, REL, ZPG, ZPX, ZPY
};
struct Opcode
{
Operation op;
AddrMode addr;
enum Operation op;
enum AddrMode addr;
Byte cycles;
const char str[4];
};
const struct Opcode OPCODE_MATRIX[512];
const struct Opcode OPCODE_TABLE[256];
struct CPU
@ -59,8 +59,11 @@ struct CPU
Word pc;
Byte remainingCycles;
Byte fetchedVal;
Word fetchedAddress;
char fetchedRelAddress;
const struct Opcode* currentOpcode;
struct Bus* bus;