diff --git a/sound-driver/spi.c b/sound-driver/spi.c
index 53b6d24..3e6087d 100644
--- a/sound-driver/spi.c
+++ b/sound-driver/spi.c
@@ -1,13 +1,83 @@
 #include <msp430g2553.h>
 #include "spi.h"
+#include "../game-ctrl/sound.h"
 
 
+volatile t_SoundCmd cmd;
+
 void __attribute__ ((interrupt (USCIAB0RX_VECTOR))) receive() {
   if (UC0IFG & UCB0RXIFG) {
     // receive an octet
+    cmd = UCB0RXBUF
   }
 }
 
+void spiCmdHandler(void *handle) {
+  uint8_t cmdShadow;
+
+  __disable_interrupt(); 
+  cmdShadow = cmd;
+  __enable_interrupt();
+
+  /*
+  e_SOUND_IDLE = 0,
+  e_SOUND_MUTE = 1,
+  e_SOUND_UNMUTE,
+  e_SOUND_START_BACKGROUND,
+  e_SOUND_STOP_BACKGROUND,
+  e_SOUND_START_GAMEOVER,
+  e_SOUND_STOP_GAMEOVER,
+  e_SOUND_SPEED_UP,
+  e_SOUND_FANFARE_BASE,
+  e_SOUND_FANFARE_1,
+  e_SOUND_FANFARE_2,
+  e_SOUND_FANFARE_3,
+  e_SOUND_FANFARE_4,
+  e_SOUND_STONE_LOCKED,
+  e_SOUND_STONE_MOVE_LEFT,
+  e_SOUND_STONE_MOVE_RIGHT,
+  e_SOUND_STONE_ROTATE_LEFT,
+  e_SOUND_STONE_ROTATE_RIGHT,
+  e_SOUND_STONE_MOVE_DOWN,
+  */
+
+  switch (cmdShadow) {
+    case e_SOUND_MUTE:
+      break;
+    case e_SOUND_UNMUTE:
+      break;
+    case e_SOUND_START_BACKGROUND:
+      break;
+    case e_SOUND_STOP_BACKGROUND:
+      break;
+    case e_SOUND_START_GAMEOVER:
+      break;
+    case e_SOUND_STOP_GAMEOVER:
+      break;
+    case e_SOUND_SPEED_UP:
+      break;
+    case e_SOUND_FANFARE_1:
+      break;
+    case e_SOUND_FANFARE_2:
+      break;
+    case e_SOUND_FANFARE_3:
+      break;
+    case e_SOUND_FANFARE_4:
+      break;
+    case e_SOUND_STONE_LOCKED:
+      break;
+    case e_SOUND_STONE_MOVE_DOWN:
+      break;
+    case e_SOUND_STONE_MOVE_LEFT:
+      break;
+    case e_SOUND_STONE_MOVE_RIGHT:
+      break;
+    case e_SOUND_STONE_ROTATE_LEFT:
+      break;
+    case e_SOUND_STONE_ROTATE_RIGHT:
+      break;
+  }
+}
 
 void spiInit() {
   // SPI slave