Addition décimale à l'arrache...

Author: peekyou

SnesEmulator/SnesEmulator.Hardware/CPU.cs

@@ -203,5 +203,33 @@ public void UpdateCurrentContext(ref InstructionDecodeContext context)
             context.MFlag = MFlag;
             context.XFlag = XFlag;
         }
+
+        public int BCDConversion(int value)
+        {
+            double result = 0;
+            int i = 1;
+            string hexValue = value.ToString();
+            foreach (char c in hexValue)
+            {
+                result += char.GetNumericValue(c) * Math.Pow(16, hexValue.Length - i);
+                i++;
+            }
+            return (int)result;
+        }
+
+        public int Decimal16bit(int value)
+        {
+            int result = 0;
+            int mult = 1;
+            string hexValue = value.ToString("X");
+            IEnumerable<char> rString = hexValue.Reverse();
+            foreach (char c in rString)
+            {
+                int digit = (int)Convert.ToInt32(c.ToString(), 16) * mult;
+                result += digit;
+                mult = mult * 10;
+            }
+            return result;
+        }
     }
 }

SnesEmulator/SnesEmulator.Hardware/Instructions/InstructionsSets/InstructionADC.cs

@@ -174,7 +174,33 @@ protected void Execute(int value)
         {
             if (CPU.CarryFlag)
                 value++;
-            CPU.ACC += value;
+            if (CPU.DecimalFlag)
+            {
+                if (CPU.MFlag)
+                {
+                    int tmp = CPU.ACC;
+                    if (tmp > 0x10)
+                        tmp = Convert.ToInt32(tmp.ToString("X"), 10);
+                    CPU.ACC = CPU.BCDConversion(tmp + value);
+                    if (CPU.ACC >= 0x100)
+                        CPU.ACC = CPU.ACC - 0x100;
+                }
+                else
+                {
+                    int tmp = CPU.ACC;
+                    if (tmp > 0x10)
+                        tmp = Convert.ToInt32(tmp.ToString("X"), 10);
+                    int sum = CPU.Decimal16bit(value) + tmp;
+                    CPU.ACC = CPU.BCDConversion(sum);
+                    if (CPU.ACC >= 0x9999)
+                    {
+                        CPU.ACC &= 0xFFFF;
+                        CPU.CarryFlag = true;
+                    }
+                }
+            }
+            else
+                CPU.ACC += value;
         }
 
         protected void SetRegisters()