Registers (#3)

* Byte Dataclass * Added some abbreviations and registers of bank0 * New Bank approach * implemented indirect Addressing of registers..partially * Added other unique special registers to bank array * Working Memory with direct and indirect addressing * Some simplifications and branch removals * Added working register * Removed NewByte.java * Simplified if statements * Removed unneccesary check in if
2023-05-19 22:24:58 +02:00
parent 97a75622f9
commit 9e73a08b8f
3 changed files with 148 additions and 2 deletions
--- a/Registers.java
+++ b/Registers.java
@@ -0,0 +1,123 @@
+import java.util.Arrays;
+
+public class Registers
+{
+    private static final int MEMORY_SIZE = 0xFF;  //Addressable Memory
+    public static final int workingRegister = 0;
+    private static final int[] memory = new int[MEMORY_SIZE];
+    private static final int[] bank0UniqueSpecialRegister = new int[] {0x01,0x05,0x06,0x08,0x09}; //and many more
+    private static final int[] bank1UniqueSpecialRegister = new int[] {0x81,0x85,0x86,0x88,0x89}; //and many more
+
+    public static int getRegister(int address)
+    {
+        if(address == 0x0)
+        {
+            int indirectAddress = getFSR();
+            return getDataFromIndirectAddress(indirectAddress);
+        }
+        if(getRegisterBank() != 0)
+        {
+            if((Arrays.stream(bank1UniqueSpecialRegister).anyMatch(x -> x == address)))
+            {
+                return memory[address + 128]; //Write to correct memory address
+            }
+        }
+        return memory[address];
+    }
+
+    public static void setRegister(int address, int data)
+    {
+        if(address == 0x0)
+        {
+            int indirectAddress = getFSR();
+            setDataFromIndirectAddress(indirectAddress, data);
+            return;
+        }
+        if(getRegisterBank() != 0)
+        {
+            if((Arrays.stream(bank1UniqueSpecialRegister).anyMatch(x -> x == address)))
+            {
+                memory[address + 128] = data; //Write to correct memory address
+                return;
+            }
+        }
+        memory[address] = data;
+    }
+
+    private static int getDataFromIndirectAddress(int address)
+    {
+        if((Arrays.stream(bank0UniqueSpecialRegister).anyMatch(x -> x == address)) || (Arrays.stream(bank1UniqueSpecialRegister).anyMatch(x -> x == address)))
+        {
+            return memory[address];
+        }
+        return memory[address % 128]; // else: Registers which are mapped
+    }
+
+    private static void setDataFromIndirectAddress(int address, int data)
+    {
+        if((Arrays.stream(bank0UniqueSpecialRegister).anyMatch(x -> x == address)) || (Arrays.stream(bank1UniqueSpecialRegister).anyMatch(x -> x == address)))
+        {
+            memory[address] = data;
+        }
+        memory[address % 128] = data; // else: Registers which are mapped
+    }
+
+    private static int getRegisterBank()
+    {
+        if((memory[0x03] & 0x20) == 0x0)  //Check RP0 Bit of Bank0 Status Register
+        {
+            return 0;
+        }
+        return 1;
+    }
+
+    private static int getFSR()
+    {
+        return memory[0x4];
+    }
+
+    public static boolean getZeroBit()
+    {
+        return (memory[0x03] & 0x04) == 0x04;
+    }
+
+    public static void setZeroBit()
+    {
+        memory[0x03] |= 0x04;
+    }
+
+    public static void clearZeroBit()
+    {
+        memory[0x03] &= 0xFB;
+    }
+
+    public static boolean getDigitCarryBit()
+    {
+        return (memory[0x03] & 0x02) == 0x02;
+    }
+
+    public static void setDigitCarryBit()
+    {
+        memory[0x03] |= 0x02;
+    }
+
+    public static void clearDigitCarryBit()
+    {
+        memory[0x03] &= 0xFD;
+    }
+
+    public static boolean getCarryBit()
+    {
+        return (memory[0x03] & 0x01) == 0x01;
+    }
+
+    public static void setCarryBit()
+    {
+        memory[0x03] |= 0x01;
+    }
+
+    public static void clearCarryBit()
+    {
+        memory[0x03] &= 0xFE;
+    }
+}