[barometer] add pre-processor guards for optional barometer

firmware/inc/hw_config.h

@@ -133,9 +133,10 @@
 /**
  * Barometer
  */
-#define BAROMETER_TYPE_BMP180 0
-#define BAROMETER_TYPE_MS5607 1
-#define BAROMETER_TYPE_MS5611 0
+#define USE_BAROMETER		0
+#define BAROMETER_TYPE_BMP180	0
+#define BAROMETER_TYPE_MS5607	1
+#define BAROMETER_TYPE_MS5611	0
 
 /**
  * Battery ADC

firmware/src/data.c

@@ -101,9 +101,11 @@ struct tracker_datapoint* collect_data(void)
   /**
    * ---- Barometer ----
    */
+#if USE_BAROMETER
   struct barometer* b = get_barometer();
   datapoint.main_pressure = b->pressure;
   datapoint.bmp180_temperature = (float)b->temperature;
+#endif
 
 #ifdef GPS_TYPE_UBX
   /**

firmware/src/init.c

@@ -133,8 +133,10 @@ void init(enum init_type init_t)
   /* i2c */
   i2c_bb_init();
 
+#if USE_BAROMETER
   /* barometer */
   barometer_init();
+#endif
 
   if (init_t != INIT_TESTCASE) {
     /* Telemetry init depends on gclk */