Added Argument fetch + other stuff

Makefile

@@ -20,6 +20,7 @@ ls7emulator:
 	cd ../bin
 	mv ../src/ls7emulator ./
 	strip ls7emulator
+	cp ../src/assets/font.ttf ./
 
 install: ls7emulator
 	mkdir -p $(PREFIX)/bin

src/config.h

@@ -10,8 +10,36 @@
 #define ROMLOC  	0xC000		/* ROM Page Location */
 
 #define BACKCOLOR sfBlack
+#define FPS 60
 
-#define CPUSPEED 4096 * 16
+#define PREAMBLE "LS7 Emulator by Gabriel Weingardt.\nLicense: GPL v.3+\n\n"
 
+#define HELP "Usage: LS7Emulator [options] file\n\n\
+Options:        Type    Default     Desc\n\
+--help                              Show this menu\n\
+--help-keys                         Show emulator key functions\n\
+--cpuspeed      [int]   100000      CPU Speed given in Herz. KHz and MHz annotations like 1KHz are supported\n\
+--scale         [float]   2.0       Set the starting scale of the video output\n\
+--singlestep                        Enable singlestepping with the 'F8' key\n\
+--clocksteps    [int]     1         Set the clock cycles cycled by a singlestep\n\
+--snapshot      [string]            Import a CPU snapshot\n\
+\n"
 
-static float displayScale = 2;
+#define HELPKEYS "\
+F1              Exit emulator\n\
+F2              Show Key Help\n\
+F3              Show Debug Menu\n\
+F4              Halt CPU\n\
+F5              Reset CPU\n\
+F6              Scale--\n\
+F7              Scale++\n\
+F8              Single step CPU\n\
+F9              Save CPU snapshot\n\
+F10             Load previous snapshot\n\
+F11             CPU NMI\n\
+F12             CPU IRQ\n\n"
+
+static float displayscale = 2;
+static int cpuspeed = 100000; // 100 kHz
+static int singlestep = 0;
+static int clocksteps = 1;

src/events.c

@@ -4,10 +4,15 @@
 #include <SFML/Window.h>
 
 extern float displayScale;
+extern int clocksteps;
+extern uint8_t halt;
+extern uint8_t showDebug;
+extern uint8_t showHelp;
 
 extern void resetSystem();
 extern void irq6502();
 extern void nmi6502();
+extern void step6502();
 extern void updateRenderStates();
 extern void scanKeyboard();
 
@@ -27,34 +32,61 @@ void pollEvents(sfRenderWindow *window){
 				break;
 			case sfEvtKeyPressed:
 				switch (event.key.code){
-					case sfKeyEscape:
+					case sfKeyF1:	/* Close Window or show help*/
 						sfRenderWindow_close(window);
 						break;
 						
-					case sfKeyF2:
+					case sfKeyF2:	/* Show Key Help */
+						showHelp = !showHelp;
+						break;
+						
+					case sfKeyF3:	/* Show Debug Menu */
+						showDebug = !showDebug;
+						break;
+						
+					case sfKeyF4:	/* CPU Halt */
+						halt = !halt;
+						break;
+						
+					case sfKeyF5:	/* CPU Reset */
+						resetSystem();
+						break;
+						
+					case sfKeyF6:	/* Scale -- */
 						if (displayscale > 1) displayscale--;
 						updateRenderStates();
 						break;
-					case sfKeyF3:
+					
+					case sfKeyF7:	/* Scale ++ */
 						displayscale++;
 						updateRenderStates();
 						break;
-					case sfKeyF5:
-						resetSystem();
+						
+					case sfKeyF8:	/* CPU Singlestep */
+						for (int i = 0; i < clocksteps; i++) step6502();
 						break;
-					case sfKeyF12:
-						irq6502();
+					
+					case sfKeyF9:	/* CPU Save Snapshot */
 						break;
-					case sfKeyF11:
+						
+					case sfKeyF10:	/* CPU Load recent or given snapshot */
+						break;
+						
+					case sfKeyF11:	/* CPU NMI */
 						nmi6502();
 						break;
 						
+					case sfKeyF12:	/* CPU IRQ */
+						irq6502();
+						break;
+					
 					default:
 						currentKey = event.key.code;
 						break;
 				}
 				break;
 			case sfEvtKeyReleased:
+				// To tell keyboard.c, that no key is being pressed
 				currentKey = sfKeyUnknown;
 				break;
 					

src/main.c

@@ -18,26 +18,30 @@
 
 sfVertexArray *renderArray;
 sfRenderWindow *window;
+sfFont *font;
+sfText *renderText;
 sfRenderStates renderStates;
+sfRectangleShape *haltRect;
 
+uint8_t halt = 0;
+uint8_t showHelp = 0;
+uint8_t showDebug = 0;
 
-void openFile(const char *inputFile){
+int openFile(const char *inputFile){
     FILE *file = fopen(inputFile, "rb");
+    int retCode = 0;
     
     if (file != NULL){
         fseek(file, 0, SEEK_END);
         long filelen = ftell(file);
         rewind(file);
         
-        fread(rom, filelen, 1, file);
-    
-        printf("Loaded File\n");
-    } else {
-        printf("Error while opening file\n");
-        exit(1);
-    }
+        if (fread(rom, filelen, 1, file) != 1) retCode = 1;
+    } else retCode = 1;
     
     fclose(file);
+    
+    return retCode;
 }
 
 void resetSystem(){
@@ -48,35 +52,87 @@ void resetSystem(){
 
 void updateRenderStates(){
     renderStates.transform = sfTransform_Identity;
-    sfTransform_scale(&renderStates.transform, displayScale, displayScale);
+    sfTransform_scale(&renderStates.transform, displayscale, displayscale);
 }
 
 void drawScreen(){
     sfRenderWindow_drawVertexArray(window, renderArray, &renderStates);
+    if (halt){
+        sfRenderWindow_drawRectangleShape(window, haltRect, &renderStates);
+    }
+    if (showHelp){
+        sfText_setString(renderText, HELPKEYS);
+        
+        sfRenderWindow_drawText(window, renderText, &renderStates);
+    }
+}
+
+void writeHelp(int type){
+    if (!type)  printf(HELP);
+    else        printf(HELPKEYS);
+    
+    exit(EXIT_SUCCESS);
+}
+
+void writePreamble() {
+    printf(PREAMBLE);
+}
+
+void fetchArgs(int argc, char *argv[]){
+    writePreamble();
+    
+    for (int i = 1; i < argc; i++) {
+        if (!strcmp(argv[i], "--help"))                 writeHelp(0);
+        else if (!strcmp(argv[i], "--help-keys"))       writeHelp(1);
+        else if (!strcmp(argv[i], "--cpuspeed"))        cpuspeed = atoi(argv[++i]);
+        else if (!strcmp(argv[i], "--scale"))           displayscale = atof(argv[++i]);
+        else if (!strcmp(argv[i], "--singlestep"))      singlestep = 1;
+        else if (!strcmp(argv[i], "--clocksteps"))      clocksteps = atoi(argv[++i]);
+        //else if (!strcmp(argv[i], "--snapshot"))        snapshotFile = &argv[i];
+        
+        else {
+            if (openFile(argv[i])){
+                printf("Unknown parameter or file '%s'\nTry '--help' for help\n", argv[i]);
+                exit(EXIT_FAILURE);
+            }
+        }
+    }
 }
 
 int main(int argc, char *argv[]){
-    if (argc == 2) { openFile(argv[1]); }
-    else {
-        puts("Please specify a input file as an Argument");
-        exit(1);
-    }
+    fetchArgs(argc, argv);
     
     window = sfRenderWindow_create((sfVideoMode){800, 600, 24}, "LS7 Emulator", sfResize | sfClose, NULL);
     sfRenderWindow_setVerticalSyncEnabled(window, sfFalse);
-    sfRenderWindow_setFramerateLimit(window, 60);
+    sfRenderWindow_setFramerateLimit(window, FPS);
     sfRenderWindow_setKeyRepeatEnabled(window, sfFalse);
 
+    font = sfFont_createFromFile("bin/font.ttf");
+    
+    renderText = sfText_create();
+    sfText_setPosition(renderText, (sfVector2f){ 50, 50 });
+    sfText_setFont(renderText, font);
+    sfText_setCharacterSize(renderText, 10);
+    sfText_setFillColor(renderText, sfWhite);
+    sfText_setOutlineColor(renderText, sfBlack);
+    sfText_setOutlineThickness(renderText, 1);
+    
+    haltRect = sfRectangleShape_create();
+    sfRectangleShape_setFillColor(haltRect, (sfColor){ 0, 0, 0, 128 });
+    sfRectangleShape_setSize(haltRect, (sfVector2f){ 384, 256 });
+    
     renderStates = sfRenderStates_default();
-    sfTransform_scale(&renderStates.transform, 2, 2);
+    sfTransform_scale(&renderStates.transform, displayscale, displayscale);
     
     resetSystem();
 
     while (sfRenderWindow_isOpen(window)){
         pollEvents(window);
         
-        for (int i = 0; i < CPUSPEED; i++) step6502();
-        irq6502();
+        if (!singlestep && !halt){
+            for (int i = 0; i < cpuspeed / FPS; i++) step6502();
+            irq6502();
+        }
         
         sfRenderWindow_clear(window, BACKCOLOR);
         updateVideo();
@@ -86,7 +142,7 @@ int main(int argc, char *argv[]){
     
     sfRenderWindow_destroy(window);
 
-    return 0;
+    return EXIT_SUCCESS;
 }
 
 

src/memory.c

@@ -21,9 +21,7 @@ uint8_t read6502(uint16_t address){
 			return keyboardResult;
 			break;
 			
-		default: 
-			return NOP;
-			break;
+		default: return NOP;
 	}
 }
 
@@ -54,11 +52,10 @@ void write6502(uint16_t address, uint8_t value){
 					break;
 			}
 			break;
-				case 0xBC00:
-					systemRegister = value;
-					break;
-					
-				default: 
-					break;
+
+		case 0xBC00:
+			systemRegister = value;
+			break;
+		default: break;
 	}
 }