Minor changes

src/Makefile

@@ -1,7 +1,7 @@
 
 EXEC=chip-8
 
-$(EXEC): main.c screen.c mem.c vcpu.c
+$(EXEC): main.c screen.c mem.c vcpu.c keypad.c
 	gcc -lraylib $^ -o $@
 
 clean:

src/keypad.c

@@ -0,0 +1,28 @@
+#include "keypad.h"
+
+int map[]={
+  KEY_X, // 0
+  KEY_ONE, // 1
+  KEY_TWO, // 2
+  KEY_THREE, // 3
+  KEY_Q,  // 4
+  KEY_W,  // 5
+  KEY_E,  // 6
+  KEY_A,  // 7
+  KEY_S, // 8
+  KEY_D, // 9
+  KEY_Z, // A
+  KEY_C, // B
+  KEY_FOUR, // C
+  KEY_R, // D
+  KEY_F, // E
+  KEY_V // F
+};
+
+int KeypadIsPressed(unsigned char c){
+  if(c<=0xF){
+    if(IsKeyPressed(map[c]))
+      return 1;
+  }
+  return 0;
+}

src/keypad.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include "raylib.h"
+
+int KeypadIsPressed(unsigned char c);
+

src/main.c

@@ -13,7 +13,7 @@ int main(int argc, char *argv[])
 
   // Initialize
   MemInit();
-  MemLoadROM("../roms/chiptest.ch8");
+  MemLoadROM("../roms/chip8-test-suite/5-quirks.ch8");
 
   ScreenInit(800,400);
   VCPUInit();
@@ -21,9 +21,11 @@ int main(int argc, char *argv[])
   int i=0;
 
   while (!WindowShouldClose()){
+    for(int i=0;i<500;i++){
     VCPUFetch();
     VCPUDecode();
-    VCPUExecute();  
+    VCPUExecute();
+    }
     ScreenUpdate();
   }
   

src/screen.c

@@ -15,7 +15,7 @@ void ScreenInit(int width, int height){
 
   SetTraceLogLevel(LOG_ERROR); // Disable anoying raylib logs
   InitWindow(width, height, "Chip-8 Emulator");
-  SetTargetFPS(200); // Set game to run at 60 frames-per-second
+  SetTargetFPS(500); // Set game to run at 60 frames-per-second
 }
 
 void ScreenClear() {

src/vcpu.c

@@ -1,6 +1,8 @@
 #include "vcpu.h"
 #include "mem.h"
 #include "screen.h"
+#include "keypad.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
@@ -201,7 +203,14 @@ void VCPUExecute(){
     break;
     
   case 0xE:
-    // TODO
+    if(State.NN==0x9E){ // Skip if keypress in VX
+      if(KeypadIsPressed(State.V[State.X]&0x0F)){
+        State.PC+=2;
+      }
+    }else if(State.NN==0xA1){ // Skip if not keypress in VX
+      if(!KeypadIsPressed(State.V[State.X]&0x0F))
+        State.PC+=2;
+    }
     break;
     
   case 0xF:
@@ -236,7 +245,7 @@ void VCPUExecute(){
       MemStore(&hundreds,1,State.I);
       MemStore(&tens,1,State.I+1);
       MemStore(&units,1,State.I+2);
-      //      printf("hundreds:%d tens:%d units:%d byte:%d\n",hundreds,tens,units,State.V[State.X]);
+      //printf("hundreds:%d tens:%d units:%d byte:%d\n",hundreds,tens,units,State.V[State.X]);
       break;
       
     case 0x55: