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6502-emu
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Merge pull request #3 from robmcmullen/extern_h 

Changed header to define external vars to prevent multiple symbol def…
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David Buchanan 2018-05-17 20:33:30 +01:00 committed by GitHub
parent 7e3ef5bd78 b664db7406
commit 5790cbaf03
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2 changed files with 20 additions and 10 deletions
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10
6502.c
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@ -4,6 +4,16 @@
#include "6502.h"
uint8_t memory[1<<16];
uint8_t A;
uint8_t X;
uint8_t Y;
uint16_t PC;
uint8_t SP;
uint8_t extra_cycles;
uint64_t total_cycles;
union StatusReg SR;
int lengths[NUM_MODES]; // instruction length table, indexed by addressing mode
uint8_t * (*get_ptr[NUM_MODES])(); // addressing mode decoder table
Instruction instructions[0x100]; // instruction data table

20
6502.h
View File

@ -10,14 +10,14 @@
#define RST_VEC 0xFFFC
#define IRQ_VEC 0xFFFE
uint8_t memory[1<<16];
uint8_t A;
uint8_t X;
uint8_t Y;
uint16_t PC;
uint8_t SP; // points to first empty stack location
uint8_t extra_cycles;
uint64_t total_cycles;
extern uint8_t memory[1<<16];
extern uint8_t A;
extern uint8_t X;
extern uint8_t Y;
extern uint16_t PC;
extern uint8_t SP; // points to first empty stack location
extern uint8_t extra_cycles;
extern uint64_t total_cycles;
void * read_addr;
void * write_addr;
@ -38,7 +38,7 @@ union StatusReg { // this means we can access the status register as a byte, or
uint8_t byte;
};
union StatusReg SR;
extern union StatusReg SR;
typedef enum {
ACC,
@ -64,7 +64,7 @@ typedef struct {
uint8_t cycles;
} Instruction;
Instruction instructions[0x100];
extern Instruction instructions[0x100];
void init_tables();