From 5eadac72916ce9d53ffdc3f908a6e414858fe7e0 Mon Sep 17 00:00:00 2001
From: Loic Guegan <loic.guegan@mailbox.org>
Date: Tue, 26 Dec 2023 17:51:39 +0100
Subject: [PATCH] Cleaning repository

---
 docs/Makefile                                 |  20 --
 docs/conf.py                                  |  27 ---
 docs/index.rst                                |  20 --
 docs/make.bat                                 |  35 ----
 {roms => res/roms}/README.md                  |   0
 {roms => res/roms}/games/paddles.ch8          | Bin
 {roms => res/roms}/games/pong_1player.ch8     | Bin
 .../tests}/chip8-test-suite/1-chip8-logo.ch8  | Bin
 .../tests}/chip8-test-suite/2-ibm-logo.ch8    | Bin
 .../roms/tests}/chip8-test-suite/3-corax+.ch8 | Bin
 .../roms/tests}/chip8-test-suite/4-flags.ch8  | Bin
 .../roms/tests}/chip8-test-suite/5-quirks.ch8 | Bin
 .../roms/tests}/chip8-test-suite/6-keypad.ch8 | Bin
 .../roms/tests}/chip8-test-suite/7-beep.ch8   | Bin
 .../tests}/chip8-test-suite/8-scrolling.ch8   | Bin
 {roms => res/roms/tests}/chiptest.ch8         | Bin
 {roms => res/roms/tests}/ibm.ch8              | Bin
 src/beep2.mp3 => res/speaker/beep.mp3         | Bin
 src/beep.h                                    | 194 ++++++++++++++++++
 src/beep.mp3                                  | Bin 5320 -> 0 bytes
 src/keypad.c                                  |   8 +-
 src/keypad.h                                  |   5 +
 src/main.c                                    |  19 +-
 src/mem.h                                     |  46 +++++
 src/screen.c                                  |  10 +-
 src/screen.h                                  |  40 +++-
 src/speaker.c                                 |  10 +-
 src/speaker.h                                 |  23 ++-
 src/vcpu.c                                    |   2 +-
 src/vcpu.h                                    |  63 +++++-
 30 files changed, 380 insertions(+), 142 deletions(-)
 delete mode 100644 docs/Makefile
 delete mode 100644 docs/conf.py
 delete mode 100644 docs/index.rst
 delete mode 100644 docs/make.bat
 rename {roms => res/roms}/README.md (100%)
 rename {roms => res/roms}/games/paddles.ch8 (100%)
 rename {roms => res/roms}/games/pong_1player.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/1-chip8-logo.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/2-ibm-logo.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/3-corax+.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/4-flags.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/5-quirks.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/6-keypad.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/7-beep.ch8 (100%)
 rename {roms => res/roms/tests}/chip8-test-suite/8-scrolling.ch8 (100%)
 rename {roms => res/roms/tests}/chiptest.ch8 (100%)
 rename {roms => res/roms/tests}/ibm.ch8 (100%)
 rename src/beep2.mp3 => res/speaker/beep.mp3 (100%)
 create mode 100644 src/beep.h
 delete mode 100644 src/beep.mp3

diff --git a/docs/Makefile b/docs/Makefile
deleted file mode 100644
index d4bb2cb..0000000
--- a/docs/Makefile
+++ /dev/null
@@ -1,20 +0,0 @@
-# Minimal makefile for Sphinx documentation
-#
-
-# You can set these variables from the command line, and also
-# from the environment for the first two.
-SPHINXOPTS    ?=
-SPHINXBUILD   ?= sphinx-build
-SOURCEDIR     = .
-BUILDDIR      = _build
-
-# Put it first so that "make" without argument is like "make help".
-help:
-	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
-
-.PHONY: help Makefile
-
-# Catch-all target: route all unknown targets to Sphinx using the new
-# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
-%: Makefile
-	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
diff --git a/docs/conf.py b/docs/conf.py
deleted file mode 100644
index 738a5e7..0000000
--- a/docs/conf.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# Configuration file for the Sphinx documentation builder.
-#
-# For the full list of built-in configuration values, see the documentation:
-# https://www.sphinx-doc.org/en/master/usage/configuration.html
-
-# -- Project information -----------------------------------------------------
-# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
-
-project = 'Chip-8'
-copyright = '2023, Loïc Guégan'
-author = 'Loïc Guégan'
-
-# -- General configuration ---------------------------------------------------
-# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
-
-extensions = []
-
-templates_path = ['_templates']
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
-
-
-
-# -- Options for HTML output -------------------------------------------------
-# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
-
-html_theme = 'sphinx_rtd_theme'
-html_static_path = ['_static']
diff --git a/docs/index.rst b/docs/index.rst
deleted file mode 100644
index 5825200..0000000
--- a/docs/index.rst
+++ /dev/null
@@ -1,20 +0,0 @@
-.. Chip-8 documentation master file, created by
-   sphinx-quickstart on Sun Dec 24 17:49:23 2023.
-   You can adapt this file completely to your liking, but it should at least
-   contain the root `toctree` directive.
-
-Welcome to Chip-8's documentation!
-==================================
-
-.. toctree::
-   :maxdepth: 2
-   :caption: Contents:
-
-
-
-Indices and tables
-==================
-
-* :ref:`genindex`
-* :ref:`modindex`
-* :ref:`search`
diff --git a/docs/make.bat b/docs/make.bat
deleted file mode 100644
index 32bb245..0000000
--- a/docs/make.bat
+++ /dev/null
@@ -1,35 +0,0 @@
-@ECHO OFF
-
-pushd %~dp0
-
-REM Command file for Sphinx documentation
-
-if "%SPHINXBUILD%" == "" (
-	set SPHINXBUILD=sphinx-build
-)
-set SOURCEDIR=.
-set BUILDDIR=_build
-
-%SPHINXBUILD% >NUL 2>NUL
-if errorlevel 9009 (
-	echo.
-	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
-	echo.installed, then set the SPHINXBUILD environment variable to point
-	echo.to the full path of the 'sphinx-build' executable. Alternatively you
-	echo.may add the Sphinx directory to PATH.
-	echo.
-	echo.If you don't have Sphinx installed, grab it from
-	echo.https://www.sphinx-doc.org/
-	exit /b 1
-)
-
-if "%1" == "" goto help
-
-%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
-goto end
-
-:help
-%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
-
-:end
-popd
diff --git a/roms/README.md b/res/roms/README.md
similarity index 100%
rename from roms/README.md
rename to res/roms/README.md
diff --git a/roms/games/paddles.ch8 b/res/roms/games/paddles.ch8
similarity index 100%
rename from roms/games/paddles.ch8
rename to res/roms/games/paddles.ch8
diff --git a/roms/games/pong_1player.ch8 b/res/roms/games/pong_1player.ch8
similarity index 100%
rename from roms/games/pong_1player.ch8
rename to res/roms/games/pong_1player.ch8
diff --git a/roms/chip8-test-suite/1-chip8-logo.ch8 b/res/roms/tests/chip8-test-suite/1-chip8-logo.ch8
similarity index 100%
rename from roms/chip8-test-suite/1-chip8-logo.ch8
rename to res/roms/tests/chip8-test-suite/1-chip8-logo.ch8
diff --git a/roms/chip8-test-suite/2-ibm-logo.ch8 b/res/roms/tests/chip8-test-suite/2-ibm-logo.ch8
similarity index 100%
rename from roms/chip8-test-suite/2-ibm-logo.ch8
rename to res/roms/tests/chip8-test-suite/2-ibm-logo.ch8
diff --git a/roms/chip8-test-suite/3-corax+.ch8 b/res/roms/tests/chip8-test-suite/3-corax+.ch8
similarity index 100%
rename from roms/chip8-test-suite/3-corax+.ch8
rename to res/roms/tests/chip8-test-suite/3-corax+.ch8
diff --git a/roms/chip8-test-suite/4-flags.ch8 b/res/roms/tests/chip8-test-suite/4-flags.ch8
similarity index 100%
rename from roms/chip8-test-suite/4-flags.ch8
rename to res/roms/tests/chip8-test-suite/4-flags.ch8
diff --git a/roms/chip8-test-suite/5-quirks.ch8 b/res/roms/tests/chip8-test-suite/5-quirks.ch8
similarity index 100%
rename from roms/chip8-test-suite/5-quirks.ch8
rename to res/roms/tests/chip8-test-suite/5-quirks.ch8
diff --git a/roms/chip8-test-suite/6-keypad.ch8 b/res/roms/tests/chip8-test-suite/6-keypad.ch8
similarity index 100%
rename from roms/chip8-test-suite/6-keypad.ch8
rename to res/roms/tests/chip8-test-suite/6-keypad.ch8
diff --git a/roms/chip8-test-suite/7-beep.ch8 b/res/roms/tests/chip8-test-suite/7-beep.ch8
similarity index 100%
rename from roms/chip8-test-suite/7-beep.ch8
rename to res/roms/tests/chip8-test-suite/7-beep.ch8
diff --git a/roms/chip8-test-suite/8-scrolling.ch8 b/res/roms/tests/chip8-test-suite/8-scrolling.ch8
similarity index 100%
rename from roms/chip8-test-suite/8-scrolling.ch8
rename to res/roms/tests/chip8-test-suite/8-scrolling.ch8
diff --git a/roms/chiptest.ch8 b/res/roms/tests/chiptest.ch8
similarity index 100%
rename from roms/chiptest.ch8
rename to res/roms/tests/chiptest.ch8
diff --git a/roms/ibm.ch8 b/res/roms/tests/ibm.ch8
similarity index 100%
rename from roms/ibm.ch8
rename to res/roms/tests/ibm.ch8
diff --git a/src/beep2.mp3 b/res/speaker/beep.mp3
similarity index 100%
rename from src/beep2.mp3
rename to res/speaker/beep.mp3
diff --git a/src/beep.h b/src/beep.h
new file mode 100644
index 0000000..3261618
--- /dev/null
+++ b/src/beep.h
@@ -0,0 +1,194 @@
+const unsigned char beep[] = {
+0xff, 0xfb, 0x90, 0xc4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x58, 0x69, 0x6e, 
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+0xf7, 0x00, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 
+0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 0x71, 
+0x71, 0x71, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 
+0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 0x9c, 
+0x9c, 0x9c, 0x9c, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 
+0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 0xf1, 
+0xf1, 0xf1, 0xf1, 0xf1, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 
+0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x50, 0x4c, 0x41, 0x4d, 
+0x45, 0x33, 0x2e, 0x31, 0x30, 0x30, 0x04, 0xb9, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x15, 0x20, 0x24, 0x06, 0x7f, 0x41, 0x00, 0x01, 
+0xe0, 0x00, 0x00, 0x08, 0xf7, 0x9f, 0xa0, 0x67, 0x7d, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
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+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
+0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
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+0xc4, 0x00, 0x00, 0x07, 0x40, 0x03, 0x83, 0xb4, 0x10, 0x00, 0x24, 0x44, 
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+0xba, 0x65, 0xff, 0x51, 0x61, 0x01, 0x1b, 0x19, 0x97, 0xdc, 0xa4, 0x3b, 
+0x0b, 0xe4, 0x02, 0xa4, 0x05, 0x08, 0x19, 0x6c, 0x31, 0x98, 0xeb, 0x2b, 
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diff --git a/src/beep.mp3 b/src/beep.mp3
deleted file mode 100644
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diff --git a/src/keypad.c b/src/keypad.c
index 2ff7be4..e0073e9 100644
--- a/src/keypad.c
+++ b/src/keypad.c
@@ -1,5 +1,6 @@
 #include "keypad.h"
 
+/// @brief Define you keymaps here
 int map[]={
   KEY_X, // 0
   KEY_ONE, // 1
@@ -19,6 +20,12 @@ int map[]={
   KEY_V // F
 };
 
+/**
+ * @brief Get hex from keycode (used only in this file)
+ * 
+ * @param keycode 
+ * @return int 
+ */
 int KeypadGetKey(int keycode){
   for(int i=0;i<16;i++){
     if(map[i]==keycode)
@@ -27,7 +34,6 @@ int KeypadGetKey(int keycode){
   return -1;
 }
 
-
 int KeypadGetPressed(){
   for(int i=0;i<16;i++){
     if(IsKeyDown(map[i]))
diff --git a/src/keypad.h b/src/keypad.h
index 922d2a8..23a6a70 100644
--- a/src/keypad.h
+++ b/src/keypad.h
@@ -2,5 +2,10 @@
 
 #include "raylib.h"
 
+/**
+ * @brief Return the hex code of the key currently pressed and -1 ortherwise
+ * 
+ * @return int 
+ */
 int KeypadGetPressed();
 
diff --git a/src/main.c b/src/main.c
index 02e61d0..de3ae0d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -5,17 +5,20 @@
 
 #include <stdio.h>
 
-//#define ROM "../roms/chip8-test-suite/5-quirks.ch8"
-//#define ROM "../roms/chip8-test-suite/8-scrolling.ch8"
-#define ROM "../roms/games/pong_1player.ch8"
-//#define ROM "../roms/ibm.ch8"
-
 int main(int argc, char *argv[])
 {
+  // Parse argument
+  if(argc != 2){
+    printf("Usage: %s [rom]\n",argv[0]);
+    return 1;
+  } else if(!FileExists(argv[1])){
+    printf("ROM not found: %s\n",argv[1]);
+    return 1;
+  }
 
   // Initialize
   MemInit();
-  MemLoadROM(ROM);
+  MemLoadROM(argv[1]);
   ScreenInit(1000,500);
   VCPUInit();
   SpeakerInit();
@@ -24,12 +27,8 @@ int main(int argc, char *argv[])
   SetTargetFPS(VCPU_FREQ*100);
 
   // Emulator main loop
-  int i=0;
   while (!WindowShouldClose()){
     VCPUTick();
-    if(i%600 == 0)
-      printf("tick\n");
-    i++;
   }
 
   // Finish
diff --git a/src/mem.h b/src/mem.h
index 8e4136a..6ea4e01 100644
--- a/src/mem.h
+++ b/src/mem.h
@@ -3,10 +3,56 @@
 #define ADDR_ROM 0x200
 #define ADDR_FONT 0x50
 
+/**
+ * @brief Must be called first!
+ * 
+ */
 void MemInit();
+
+/**
+ * @brief Set value of a memory region
+ * 
+ * @param addr 
+ * @param value 
+ * @param size 
+ */
 void MemSet(int addr, unsigned char value, int size);
+
+/**
+ * @brief Store date in memory
+ * 
+ * @param data 
+ * @param size 
+ * @param addr 
+ */
 void MemStore(unsigned char *data, int size, int addr);
+
+/**
+ * @brief Load data from memory
+ * 
+ * @param data 
+ * @param size 
+ * @param addr 
+ */
 void MemLoad(unsigned char *data, int size, int addr);
+
+/**
+ * @brief Load ROM into memory (be careful, file MUST exists)
+ * 
+ * @param path 
+ */
 void MemLoadROM(char *path);
+
+/**
+ * @brief Dump the entire memory
+ * 
+ */
 void MemDump();
+
+/**
+ * @brief Dump a memory region
+ * 
+ * @param addr 
+ * @param size 
+ */
 void MemDumpRange(int addr, int size);
diff --git a/src/screen.c b/src/screen.c
index a445bd8..305a40f 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -14,7 +14,7 @@ void ScreenInit(int width, int height){
   ScreenClear();
 
   SetTraceLogLevel(LOG_ERROR); // Disable anoying raylib logs
-  InitWindow(width, height, "Chip-8 Emulator");
+  InitWindow(width, height, "Chip-8 Emulator by Loïc Guégan");
 }
 
 void ScreenClear() {
@@ -26,7 +26,6 @@ void ScreenClear() {
 void ScreenUpdate(){
   BeginDrawing();
   ClearBackground(RAYWHITE);
-  //  DrawText("Congrats! You created your first window!", 190, 200, 20, LIGHTGRAY);
   for(int x=0;x<64;x++){
     for(int y=0;y<32;y++){
       if(Screen.pixels[x+y*64] == 0)
@@ -56,13 +55,6 @@ char ScreenPixelApply(int x, int y, unsigned char state){
   return flag;
 }
 
-void ScreenPixelFlip(int x, int y){
-  if(Screen.pixels[x+y*64]==0)
-    Screen.pixels[x+y*64]=1;
-  else
-    Screen.pixels[x+y*64]=0;
-}
-
 void ScreenWH(int *width, int *height){
   *width=64;
   *height=32;
diff --git a/src/screen.h b/src/screen.h
index 671285a..075d45a 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -3,7 +3,7 @@
 #include "raylib.h"
 
 #define MODE_CHIP8 0 // Chip-8 64x32
-#define MODE_SCHIP 1 // Super-Chip 128x64
+#define MODE_SCHIP 1 // Super-Chip 128x64 (not supported yet)
 
 typedef struct SCREEN_DATA {
   int width, height;
@@ -13,10 +13,46 @@ typedef struct SCREEN_DATA {
   char pixels[64*32];
 } SCREEN_DATA;
 
+/**
+ * @brief Must be called first!
+ * 
+ * @param width 
+ * @param height 
+ */
 void ScreenInit(int width, int height);
+
+/**
+ * @brief Clear the entire simulated screen
+ * 
+ */
 void ScreenClear();
+
+/**
+ * @brief Set the pixel's state of the simulated screen (follow the chip-8 specification)
+ * 
+ * @param x 
+ * @param y 
+ * @param state 
+ * @return char 1 if pixel was already on and 0 otherwise
+ */
 char ScreenPixelApply(int x, int y, unsigned char state);
-void ScreenPixelFlip(int x, int y);
+
+/**
+ * @brief Get simulated screen dimensions
+ * 
+ * @param width 
+ * @param height 
+ */
 void ScreenWH(int *width, int *height);
+
+/**
+ * @brief Draw simulated screen instantly
+ * 
+ */
 void ScreenUpdate();
+
+/**
+ * @brief Close screen (must be called before quit)
+ * 
+ */
 void ScreenClose();
diff --git a/src/speaker.c b/src/speaker.c
index b4bef73..051902b 100644
--- a/src/speaker.c
+++ b/src/speaker.c
@@ -1,17 +1,19 @@
 #include "speaker.h"
+#include "beep.h"
 
 Sound s;
 
 void SpeakerInit(){
-  InitAudioDevice();              // Initialize audio device
-  s=LoadSound(SPEAKER_AUDIO_FILE);
+  InitAudioDevice(); // Initialize audio device
+  Wave w=LoadWaveFromMemory(".mp3", beep, sizeof(beep));
+  s=LoadSoundFromWave(w);
 }
 
-void SpeakerOn(){
+void SpeakerPlay(){
   PlaySound(s);
 }
 
-void SpeakerOff(){
+void SpeakerStop(){
   StopSound(s);
 }
 
diff --git a/src/speaker.h b/src/speaker.h
index d78812c..15a3030 100644
--- a/src/speaker.h
+++ b/src/speaker.h
@@ -2,7 +2,26 @@
 
 #define SPEAKER_AUDIO_FILE "beep2.mp3"
 
+/**
+ * @brief Must be called first
+ * 
+ */
 void SpeakerInit();
-void SpeakerOn();
-void SpeakerOff();
+
+/**
+ * @brief Play beep one time
+ * 
+ */
+void SpeakerPlay();
+
+/**
+ * @brief Stop beep (interrupt it)
+ * 
+ */
+void SpeakerStop();
+
+/**
+ * @brief Must be called before exiting the application
+ * 
+ */
 void SpeakerFinish();
diff --git a/src/vcpu.c b/src/vcpu.c
index 4682f0b..4bfd86b 100644
--- a/src/vcpu.c
+++ b/src/vcpu.c
@@ -322,7 +322,7 @@ void VCPUTick(){
 
   // Play sound
   if(State.ST>0)
-    SpeakerOn();
+    SpeakerPlay();
   
   // Refresh screen
   if(State.screen_ticks>=(1.0*VCPU_FREQ/SCREEN_FREQ)){
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();