diff --git a/firmware/core/Core/Src/main.c b/firmware/core/Core/Src/main.c
index b563c81d..85059d1c 100644
--- a/firmware/core/Core/Src/main.c
+++ b/firmware/core/Core/Src/main.c
@@ -115,17 +115,21 @@ int main(void)
 
       case MODE_MODULE:
         DMA_Queue_Init(&RxQueue);
+        //TODO: Keyscanning. And transporting signals
         break;
       
       case MODE_MASTER:
-        
-        
-
-      break;  
+        DMA_Queue_Init(&RxQueue);
+        //TODO: Sending to USB and key keyscanning
+        break;  
     }
   }
 }
 
+void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) {
+  //TODO: Handle recieved message here
+}
+
 void DMA_Queue_Init(DMA_QUEUE* q){
   q->head = 0;
   q->tail = 0;