Modified version for cmake 3.16

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.22)
+cmake_minimum_required(VERSION 3.16)
 
 
 set(CMAKE_C_STANDARD 11)
@@ -25,6 +25,7 @@ endif()
 include(CTest)
 
 add_subdirectory(src)
+add_subdirectory(test)
 
 if (PROJECT_IS_TOP_LEVEL)
 	add_subdirectory(test)

src/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.22)
+cmake_minimum_required(VERSION 3.16)
 
 include(CheckSymbolExists)
 

test/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.22)
+cmake_minimum_required(VERSION 3.16)
 
 include(CheckSymbolExists)
 

test/vrEmu6502.h

@@ -0,0 +1,283 @@
+/*
+ * Troy's 6502 Emulator
+ *
+ * Copyright (c) 2022 Troy Schrapel
+ *
+ * This code is licensed under the MIT license
+ *
+ * https://github.com/visrealm/vrEmu6502
+ *
+ */
+
+#ifndef _VR_EMU_6502_H_
+#define _VR_EMU_6502_H_
+
+/* ------------------------------------------------------------------
+ * LINKAGE MODES:
+ * 
+ * Default (nothing defined):    When your executable is using vrEmuTms9918 as a DLL
+ * VR_EMU_6502_COMPILING_DLL:    When compiling vrEmuTms9918 as a DLL
+ * VR_EMU_6502_STATIC:           When linking vrEmu6502 statically in your executable
+ */
+
+#if __EMSCRIPTEN__
+  #include <emscripten.h>
+#ifdef __cplusplus
+#define VR_EMU_6502_DLLEXPORT EMSCRIPTEN_KEEPALIVE extern "C"
+#else
+#define VR_EMU_6502_DLLEXPORT EMSCRIPTEN_KEEPALIVE extern
+#endif
+
+#elif VR_EMU_6502_COMPILING_DLL
+  #define VR_EMU_6502_DLLEXPORT __declspec(dllexport)
+#elif defined WIN32 && !defined VR_EMU_6502_STATIC
+  #define VR_EMU_6502_DLLEXPORT __declspec(dllimport)
+#else
+  #ifdef __cplusplus
+    #define VR_EMU_6502_DLLEXPORT extern "C"
+  #else
+    #define VR_EMU_6502_DLLEXPORT extern
+  #endif
+#endif
+
+
+#include <stdint.h>
+#include <stdbool.h>  
+
+/* ------------------------------------------------------------------
+ * PRIVATE DATA STRUCTURE
+ */
+struct vrEmu6502_s;
+typedef struct vrEmu6502_s VrEmu6502;
+
+/* ------------------------------------------------------------------
+ * CONSTANTS
+ */
+typedef enum
+{
+  CPU_6502,     /* NMOS 6502/6510 with documented opcodes only */
+  CPU_6502U,    /* NMOS 6502/6510 with undocumented opcodes */
+  CPU_65C02,    /* Standard CMOS 65C02 */
+  CPU_W65C02,   /* Western Design Centre CMOS 65C02 */
+  CPU_R65C02,   /* Rockwell CMOS 65C02 */
+  CPU_6510 = CPU_6502U,
+  CPU_8500 = CPU_6510,
+  CPU_8502 = CPU_8500,
+  CPU_7501 = CPU_6502,
+  CPU_8501 = CPU_6502
+} vrEmu6502Model;
+
+typedef enum
+{
+  IntRequested,
+  IntCleared,
+  IntLow = IntRequested,
+  IntHigh = IntCleared
+} vrEmu6502Interrupt;
+
+typedef enum
+{
+  BitC = 0,
+  BitZ,
+  BitI,
+  BitD,
+  BitB,
+  BitU,
+  BitV,
+  BitN
+} vrEmu6502FlagBit;
+
+typedef enum
+{
+  FlagC = 0x01 << BitC,  /* carry */
+  FlagZ = 0x01 << BitZ,  /* zero */
+  FlagI = 0x01 << BitI,  /* interrupt */
+  FlagD = 0x01 << BitD,  /* decimal */
+  FlagB = 0x01 << BitB,  /* brk */
+  FlagU = 0x01 << BitU,  /* undefined */
+  FlagV = 0x01 << BitV,  /* oVerflow */
+  FlagN = 0x01 << BitN   /* negative */
+} vrEmu6502Flag;
+
+
+typedef enum
+{
+  AddrModeAbs,
+  AddrModeAbsX,
+  AddrModeAbsY,
+  AddrModeAcc,
+  AddrModeImm,
+  AddrModeImp,
+  AddrModeAbsInd,
+  AddrModeAbsIndX,
+  AddrModeIndX,
+  AddrModeIndY,
+  AddrModeRel,
+  AddrModeZP,
+  AddrModeZPI,
+  AddrModeZPX,
+  AddrModeZPY,
+} vrEmu6502AddrMode;
+
+/* ------------------------------------------------------------------
+ * PUBLIC INTERFACE
+ */
+
+ /*
+  * memory write function pointer
+  */
+typedef void(*vrEmu6502MemWrite)(uint16_t addr, uint8_t val);
+
+/*
+  * memory read function pointer
+  * 
+  * isDbg: some devices change their state when read 
+  *        (eg. TMS9918 increments its address pointer)
+  *        this flag will be false when the cpu is running
+  *        however it can be true when querying the memory 
+  *        for other purposes. devices should NOT change state
+  *        when isDbg is true.
+  *        
+  */
+typedef uint8_t(*vrEmu6502MemRead)(uint16_t addr, bool isDbg);
+
+
+/*
+ * create a new 6502
+ */
+VR_EMU_6502_DLLEXPORT VrEmu6502* vrEmu6502New(
+                                    vrEmu6502Model model,
+                                    vrEmu6502MemRead readFn,
+                                    vrEmu6502MemWrite writeFn);
+
+/* ------------------------------------------------------------------
+ *
+ * destroy a 6502
+ */
+VR_EMU_6502_DLLEXPORT void vrEmu6502Destroy(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * reset the 6502
+ */
+VR_EMU_6502_DLLEXPORT void vrEmu6502Reset(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * a single clock tick
+ */
+VR_EMU_6502_DLLEXPORT void vrEmu6502Tick(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * a single instruction cycle
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502InstCycle(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * returns a pointer to the interrupt signal.
+ * externally, you can modify it to set/reset the interrupt signal
+ */
+VR_EMU_6502_DLLEXPORT vrEmu6502Interrupt *vrEmu6502Int(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * returns a pointer to the nmi signal.
+ * externally, you can modify it to set/reset the interrupt signal
+ */
+VR_EMU_6502_DLLEXPORT vrEmu6502Interrupt *vrEmu6502Nmi(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the program counter
+ */
+VR_EMU_6502_DLLEXPORT uint16_t vrEmu6502GetPC(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * set the program counter
+ */
+VR_EMU_6502_DLLEXPORT void vrEmu6502SetPC(VrEmu6502* vr6502, uint16_t pc);
+
+/* ------------------------------------------------------------------
+ *
+ * return the accumulator
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetAcc(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the x index register
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetX(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the y index register
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetY(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the processor status register
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetStatus(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the stack pointer register
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetStackPointer(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the current opcode
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetCurrentOpcode(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the current opcode address
+ */
+VR_EMU_6502_DLLEXPORT uint16_t vrEmu6502GetCurrentOpcodeAddr(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the next opcode
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetNextOpcode(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the opcode cycle
+ */
+VR_EMU_6502_DLLEXPORT uint8_t vrEmu6502GetOpcodeCycle(VrEmu6502* vr6502);
+
+/* ------------------------------------------------------------------
+ *
+ * return the opcode mnemonic string
+ */
+VR_EMU_6502_DLLEXPORT
+const char* vrEmu6502OpcodeToMnemonicStr(VrEmu6502* vr6502, uint8_t opcode);
+
+/* ------------------------------------------------------------------
+ *
+ * return the opcode address mode
+ */
+VR_EMU_6502_DLLEXPORT
+vrEmu6502AddrMode vrEmu6502GetOpcodeAddrMode(VrEmu6502* vr6502, uint8_t opcode);
+
+/* ------------------------------------------------------------------
+ *
+ * get disassembled instruction as a string. returns next instruction address
+ */
+VR_EMU_6502_DLLEXPORT
+uint16_t vrEmu6502DisassembleInstruction(
+  VrEmu6502* vr6502, uint16_t addr,
+  int bufferSize, char *buffer,
+  uint16_t *refAddr, const char* const labelMap[0x10000]);
+
+
+
+#endif // _VR_EMU_6502_CORE_H_