Improve/simplify Makefile. main.c also renamed.

.gitignore

@@ -1,2 +1,3 @@
 *.o
 6502-emu
+memdump

6502-emu.c

@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <time.h>
+
+#include "6502.h"
+#include "6850.h"
+
+struct termios oldTermios;
+
+void step_delay()
+{
+	struct timespec req, rem;
+	
+	req.tv_sec = 0;
+	req.tv_nsec = STEP_DURATION;
+	
+	nanosleep(&req, &rem);
+}
+
+void run_cpu()
+{
+	for (;;) {		
+		// CPU timing is currently very far from being cycle-accurate
+		for (int i = 0; i < (CPU_FREQ / (ONE_SECOND / STEP_DURATION)); i++) {
+			step_cpu();
+			step_uart();
+		}
+		step_delay(); // remove this for more speed
+	}
+}
+
+void restore_stdin()
+{
+	tcsetattr(0, TCSANOW, &oldTermios);
+}
+
+void raw_stdin()
+{
+	struct termios newTermios;
+	
+	tcgetattr(0, &oldTermios);
+	newTermios = oldTermios;
+	cfmakeraw(&newTermios);
+	tcsetattr(0, TCSANOW, &newTermios);
+	atexit(restore_stdin);
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc != 2) {
+		printf("Usage: %s file.rom\n", argv[0]);
+		printf("The first 16k of \"file.rom\" is loaded into the last 16k of memory.\n");
+		return EXIT_FAILURE;
+	}
+	
+	if (load_rom(argv[1]) != 0) {
+		printf("Error loading \"%s\".\n", argv[1]);
+		return EXIT_FAILURE;
+	}
+	
+	raw_stdin(); // allow individual keystrokes to be detected
+	
+	init_tables();
+	init_uart();
+	
+	reset_cpu();
+	run_cpu();
+	
+	return EXIT_SUCCESS;
+}

Makefile

@@ -1,22 +1,17 @@
-CC=gcc
-CFLAGS=-Wall -Ofast -std=gnu99
+CFLAGS = -Wall -Ofast -std=gnu99
+LDFLAGS = -Ofast
+
+OBJ := 6502-emu.o 6502.o 6850.o
 
 all: 6502-emu
 
-6502-emu: main.o 6502.o 6850.o
-	$(CC) -o 6502-emu main.c 6502.o 6850.o
+debug: CFLAGS += -DDEBUG
+debug: 6502-emu
 
-main.o: main.c
-	$(CC) $(CFLAGS) -c main.c
-
-6502.o: 6502.c
-	$(CC) $(CFLAGS) -c 6502.c
-
-6850.o: 6850.c
-	$(CC) $(CFLAGS) -c 6850.c
+6502-emu: $(OBJ)
 
 clean:
-	rm *.o 6502-emu
+	$(RM) 6502-emu $(OBJ)
 
 test: 6502-emu
 	./6502-emu examples/ehbasic.rom