From c6b5e3989eafab32a64f64f96be3574c8ae97645 Mon Sep 17 00:00:00 2001
From: Darkress <30271678+DarkressX@users.noreply.github.com>
Date: Wed, 7 Jun 2023 21:30:49 +0200
Subject: [PATCH] implemented btfsc Instruction

---
 de/darkress/pic16f84sim/Main.java             |  2 +-
 de/darkress/pic16f84sim/commands/Btfsc.java   | 29 +++++++++++++++++++
 .../pic16f84sim/decoder/CommandDecoder.java   |  3 +-
 3 files changed, 31 insertions(+), 3 deletions(-)
 create mode 100644 de/darkress/pic16f84sim/commands/Btfsc.java

diff --git a/de/darkress/pic16f84sim/Main.java b/de/darkress/pic16f84sim/Main.java
index d322631..4a6bda6 100644
--- a/de/darkress/pic16f84sim/Main.java
+++ b/de/darkress/pic16f84sim/Main.java
@@ -14,7 +14,7 @@ class Main
         ArrayList<Command> program = new ArrayList<>();
         Memory.workingRegister = 0x01;
         Memory.setRegister(0x14, 0xA5); //240 << 224
-        program.add(CommandDecoder.decode(0x1594));
+        program.add(CommandDecoder.decode(0x1894));
         for(int i = 0; i < program.size(); i++)
         {
             program.get(ProgramCounter.getPc()).execute();
diff --git a/de/darkress/pic16f84sim/commands/Btfsc.java b/de/darkress/pic16f84sim/commands/Btfsc.java
new file mode 100644
index 0000000..4746384
--- /dev/null
+++ b/de/darkress/pic16f84sim/commands/Btfsc.java
@@ -0,0 +1,29 @@
+package de.darkress.pic16f84sim.commands;
+
+import de.darkress.pic16f84sim.microcontroller.Memory;
+import de.darkress.pic16f84sim.microcontroller.ProgramCounter;
+
+public class Btfsc extends BitOrientedCommandUtils implements Command
+{
+    private final int address;
+    private int bitPlacement;
+
+    public Btfsc(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 clear
+        {
+            ProgramCounter.incPC();
+        }
+
+        ProgramCounter.incPC();
+    }
+}
diff --git a/de/darkress/pic16f84sim/decoder/CommandDecoder.java b/de/darkress/pic16f84sim/decoder/CommandDecoder.java
index c1f13c4..816df2e 100644
--- a/de/darkress/pic16f84sim/decoder/CommandDecoder.java
+++ b/de/darkress/pic16f84sim/decoder/CommandDecoder.java
@@ -61,8 +61,7 @@ public class CommandDecoder
             case 0x1400:
                 return new Bsf(input);
             case 0x1800:
-                //btfsc();
-                break;
+                return new Btfsc(input);
             case 0x1C00:
                 //btfss();
                 break;