Tidy various compiler warnings

firmware/inc/aprs.h

@@ -56,6 +56,8 @@
 
 #endif
 
+void encode_backlog(char* str, tracker_datapoint* dp);
+
 void aprs_set_datapoint(tracker_datapoint* dp);
 void aprs_set_comment(char* comment);
 void aprs_set_backlog_comment(tracker_datapoint* log_dp);

firmware/inc/gps.h

@@ -47,6 +47,7 @@ struct ubx_nav_timeutc gps_get_nav_timeutc();
 uint8_t gps_is_locked(void);
 void gps_set_powersave_auto(void);
 
+void gps_usart_init_enable(uint32_t baud_rate);
 void gps_init(void);
 void usart_loopback_test(void);
 

firmware/inc/sercom/i2c_master.h

@@ -44,6 +44,7 @@
 #ifndef I2C_MASTER_H_INCLUDED
 #define I2C_MASTER_H_INCLUDED
 
+#include "samd20.h"
 #include "sercom/i2c_common.h"
 #include <sercom/sercom.h>
 #include <system/pinmux.h>

firmware/test/tc/backlog_read.h

@@ -10,6 +10,7 @@
 
 #include "backlog.h"
 #include "data.h"
+#include "aprs.h"
 
 /* Parameters in */
 struct backlog_read_tc_params {

firmware/test/tc/gps_baud_error.h

@@ -9,6 +9,7 @@
 #include "hw_config.h"
 #include "sercom/sercom.h"
 #include "sercom/usart.h"
+#include "gps.h"
 
 /* Parameters in */
 struct gps_baud_error_tc_params {