Changed the number of arguments in a command.

emb/command.h

@@ -3,13 +3,15 @@
 
 #include <stdint.h>
 
+#define NUM_ARGS 3
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
      struct command {
 	  char comm_ch; /* Character of command (ie 's', 'v', 'd') */
-	  int16_t arg[2];
+	  int16_t arg[NUM_ARGS];
      };
      
      uint8_t uart_add_ch(char c);