From 5f1ba4e9e69b371c5f477da2378ebda5d6d46e2b Mon Sep 17 00:00:00 2001
From: Darkress <30271678+DarkressX@users.noreply.github.com>
Date: Wed, 7 Jun 2023 21:34:01 +0200
Subject: [PATCH] implemented btfss Instruction

---
 de/darkress/pic16f84sim/Main.java             |  4 +--
 de/darkress/pic16f84sim/commands/Btfss.java   | 29 +++++++++++++++++++
 .../pic16f84sim/decoder/CommandDecoder.java   |  5 +---
 3 files changed, 32 insertions(+), 6 deletions(-)
 create mode 100644 de/darkress/pic16f84sim/commands/Btfss.java

diff --git a/de/darkress/pic16f84sim/Main.java b/de/darkress/pic16f84sim/Main.java
index 4a6bda6..229b7e7 100644
--- a/de/darkress/pic16f84sim/Main.java
+++ b/de/darkress/pic16f84sim/Main.java
@@ -13,8 +13,8 @@ class Main
 
         ArrayList<Command> program = new ArrayList<>();
         Memory.workingRegister = 0x01;
-        Memory.setRegister(0x14, 0xA5); //240 << 224
-        program.add(CommandDecoder.decode(0x1894));
+        Memory.setRegister(0x14, 0xA7); //240 << 224
+        program.add(CommandDecoder.decode(0x1C94));
         for(int i = 0; i < program.size(); i++)
         {
             program.get(ProgramCounter.getPc()).execute();
diff --git a/de/darkress/pic16f84sim/commands/Btfss.java b/de/darkress/pic16f84sim/commands/Btfss.java
new file mode 100644
index 0000000..ded0986
--- /dev/null
+++ b/de/darkress/pic16f84sim/commands/Btfss.java
@@ -0,0 +1,29 @@
+package de.darkress.pic16f84sim.commands;
+
+import de.darkress.pic16f84sim.microcontroller.Memory;
+import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
+
+public class Btfss extends BitOrientedCommandUtils implements Command
+{
+    private final int address;
+    private int bitPlacement;
+
+    public Btfss(int input)
+    {
+        address = input & 0x007F;
+        bitPlacement = checkBitPlacement(input);
+    }
+
+    @Override
+    public void execute()
+    {
+        int result = Memory.getRegister(address);
+
+        if((result & (1 << bitPlacement)) > 0) //Test if bit is set
+        {
+            ProgramCounter.incPC();
+        }
+
+        ProgramCounter.incPC();
+    }
+}
diff --git a/de/darkress/pic16f84sim/decoder/CommandDecoder.java b/de/darkress/pic16f84sim/decoder/CommandDecoder.java
index 816df2e..10eea94 100644
--- a/de/darkress/pic16f84sim/decoder/CommandDecoder.java
+++ b/de/darkress/pic16f84sim/decoder/CommandDecoder.java
@@ -63,16 +63,13 @@ public class CommandDecoder
             case 0x1800:
                 return new Btfsc(input);
             case 0x1C00:
-                //btfss();
-                break;
+               return new Btfss(input);
         }
 
         switch(input & 0x3E00)
         {
             case 0x3E00:
-                //addlw();
                 return new Addlw(input);
-                //break;
             case 0x3C00:
                 return new Sublw(input);
         }