1 files changed, 52 insertions, 11 deletions

diff --git a/src/vcpu.h b/src/vcpu.h
index 16de017..4266ac4 100644
--- a/src/vcpu.h
+++ b/src/vcpu.h
@@ -5,28 +5,31 @@
 #define SCREEN_FREQ 60
 #define REG_FLAG 0xF
 
+/**
+ * @brief Store the entire VCPU state
+ * 
+ */
 typedef struct VCPU_State {
-  // Program Counter (16 bits but only 12 bits used (4096 memory addresses))
+  /// @brief Program Counter (16 bits but only 12 bits used (4096 memory addresses))
   unsigned short PC;
 
-  // Index register (16 bits but only 12 bits used (4096 memory addresses))
+  /// @brief Index register (16 bits but only 12 bits used (4096 memory addresses))
   unsigned short I;
 
-  // Stack register (16 bits)
+  /// @brief Stack register (16 bits)
   unsigned short S;
   unsigned short stack[100]; // Emulated stack
 
-  // General purpose registers (8 bits each)
-  // Note last one often used as a flag register
-  unsigned char V[16];
+  /// @brief General purpose registers (8 bits each)
+  unsigned char V[16]; // Note last one often used as a flag register
 
-  // Delay timer (8 bits)
+  /// @brief Delay timer (8 bits)
   unsigned char DT;
 
-  // Sound timer (8 bits)
+  /// @brief Sound timer (8 bits)
   unsigned char ST;
 
-  // Intruction (opcode + decoded fields)
+  /// @brief Intruction (opcode + decoded fields)
   unsigned short opcode;
   unsigned char X;
   unsigned char Y;
@@ -34,20 +37,58 @@ typedef struct VCPU_State {
   unsigned char NN;
   unsigned short NNN;
 
-  // Keypressed
+  /// @brief Keypressed
   int keypressed; // Not 0 if a key was pressed
   unsigned char key;
   
-  // Count VCPU ticks
+  /// @brief Count VCPU ticks
   int dt_ticks;
   int st_ticks;
   int screen_ticks;
 } VCPU_State;
 
+/**
+ * @brief Must be called first!
+ * 
+ */
 void VCPUInit();
+
+/**
+ * @brief Fetch instruction from memory
+ * 
+ */
 void VCPUFetch();
+
+/**
+ * @brief Decode instruction from the last fetch
+ * 
+ */
 void VCPUDecode();
+
+/**
+ * @brief Execute decode instruction
+ * 
+ */
 void VCPUExecute();
+
+/**
+ * @brief Fetch, decode and execute an instruction
+ * 
+ */
 void VCPUTick();
+
+/**
+ * @brief Simple (a bit) binary to BCD convertion
+ * 
+ * @param x 
+ * @param u 
+ * @param t 
+ * @param h 
+ */
 void VCPUDoubleDabble(unsigned char x, unsigned char *u, unsigned char *t, unsigned char *h);
+
+/**
+ * @brief Dump VCPU state
+ * 
+ */
 void VCPUDump();