Init

Makefile

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+CC = gcc
+BIN = ./bin
+OBJ = ./obj
+SRC = ./src
+
+SRCS = $(wildcard $(SRC)/*.c)
+OBJS = $(patsubst $(SRC)/%.c,$(OBJ)/%.o,$(SRCS))
+EXE = $(BIN)/emu
+
+CFLAGS = -Wall
+LDLIBS = -lm
+
+.PHONY: all run clean
+
+all: $(EXE)
+
+$(EXE): $(OBJS) | $(BIN)
+	$(CC) $(LDFLAGS) $^ -o $@ $(LDLIBS)
+
+$(OBJ)/%.o: $(SRC)/%.c | $(OBJ)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BIN) $(OBJ):
+	mkdir $@
+
+run: $(EXE)
+	$<
+
+clean:
+	rm -rf $(OBJ) $(BIN)

src/cpu.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  cpu.c
+ *
+ *    Description:  6502 CPU emulator 
+ *
+ *        Version:  1.0
+ *        Created:  2023-09-21 10:10:26 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  William Nolin, 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+#include <stdio.h>
+#include <stdlib.h>
+
+long cpu_clock = 0;
+
+void cpu_step_to(long cycle) {
+    cpu_clock = cycle;
+    printf("Clock: %ld", cpu_clock);
+}
+

src/cpu.h

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  cpu.h
+ *
+ *    Description:  6502 CPU emulator headers 
+ *
+ *        Version:  1.0
+ *        Created:  2023-09-21 10:12:33 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  William Nolin, 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+
+#ifndef EMU_CPU_H
+#define EMU_CPU_H
+
+/**
+ * @brief Set clock
+ */
+void cpu_step_to(int cycle);
+
+#endif

src/main.c

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+/*
+ * =====================================================================================
+ *
+ *       Filename:  main.c
+ *
+ *    Description:  Emulator main loop 
+ *
+ *        Version:  1.0
+ *        Created:  2023-09-21 09:50:34 PM
+ *       Revision:  none
+ *       Compiler:  gcc
+ *
+ *         Author:  William Nolin, 
+ *   Organization:  
+ *
+ * =====================================================================================
+ */
+#include <stdlib.h>
+
+#include "cpu.h"
+
+long master_clock = 0;
+
+void step() {
+    master_clock += 1;
+    cpu_step_to(master_clock);
+
+    return;
+}
+
+int main() {
+    while (1) {
+        step();
+    }
+
+    return -1;
+}
+