seperated functions in different files

Firmware/gps.c

@@ -0,0 +1,83 @@
+/** @file gps.c
+*  @brief This file contains GPS function implementations
+*
+*  @author Mohamed Boubaker
+*  @bug issue #9
+*/
+#include <string.h>
+#include <stdio.h>
+#include "gps.h"
+
+
+/*******************************************************/
+/*                     GPS functions                   */
+/*******************************************************/
+
+/**
+ * @brief sim_gps_enable() enables the GPS functionality of the SIM808 module.
+ * @return 1 if the GPS is successfully enabled, 0 otherwise
+ */
+uint8_t sim_gps_enable(){
+	const char gps_power_on_cmd[]= "AT+CGPSPWR=1\r";
+	const char gps_set_mode_cold_cmd[]= "AT+CGPSRST=0\r";
+	uint8_t power_on_status=0;
+	uint8_t set_mode_status=0;
+
+	power_on_status=send_cmd(gps_power_on_cmd,RX_WAIT); 
+	set_mode_status=send_cmd(gps_set_mode_cold_cmd,RX_WAIT); 
+
+	return (power_on_status && set_mode_status);
+}
+
+/**
+* @brief sim_gps_get_location() checks if the module has a GPS fix and querries the GPS module for the current position.
+* The modules reply inculde: 
+* -GPS time
+* -latitue and longitute in DMM.MM (Degrees Minutes.Minutes)
+* -the prefered format used on the server is the decimal degrees dd. The transformation dd = d + mm.mm/60 
+* needs to be done on the server
+* @param char * coordinates is an array that will store the GPS position
+* @return 1 if the GPS position is calculated correctly, 0 if the module doesn't have a fix or an error occurs.
+*/
+uint8_t sim_gps_get_location(char * coordinates){
+
+	/* GPS Status can be:
+	 * "Location Unknown" if GPS is not enabled
+	 * "Location not Fix" 
+	 * "Location 2D Fix"
+	 * "Location 3D Fix"
+	 */
+	static const char gps_get_status_cmd[]= "AT+CGPSSTATUS?\r";	
+	const char gps_get_location_cmd[]= "AT+CGPSINF=0\r";
+	char local_rx_buffer[RX_BUFFER_LENGTH];
+	uint8_t err_status=0;
+
+
+	/*Check GPS Fix status*/
+	sim_get_cmd_reply(gps_get_status_cmd,local_rx_buffer,RX_WAIT);
+
+	if (strstr(local_rx_buffer,"Location 3D Fix")!=NULL){
+
+		/*clear local buffer*/
+		memset(local_rx_buffer,NULL,RX_BUFFER_LENGTH);
+
+		err_status=sim_get_cmd_reply(gps_get_location_cmd,local_rx_buffer,RX_WAIT);
+
+		/* Example reply 
+		* AT+CGPSINF=0 +CGPSINF: 0,4927.656000,1106.059700,319.200000,20220816200132.000,0,12,1.592720,351
+		* Actuall coordinates start at charachter 27
+		*/
+
+		/* Extract the coordinates from the cmd reply and copy only 
+		*	the coordinates into function parameter char * coordinates
+		*/
+		memcpy(local_rx_buffer+27,coordinates,GPS_COORDINATES_LENGTH);
+
+		return err_status;
+	}
+	else
+		/* GPS has no fix, return 0 to indicate failure*/
+		return 0;
+}
+
+

Firmware/gps.h

@@ -0,0 +1,46 @@
+/** @file network_functions.c
+*  @brief This file include the declaration of functions related to GPS 
+*
+*  @author Mohamed Boubaker
+*  @bug issue #9
+*/
+#ifndef GPS_H
+#define GPS_H
+
+#include "sim808.h"
+
+
+
+/**
+ * @brief enables the GPS functionality of the SIM808 module
+ * @return 1 if the GPS is successfully enabled, 0 otherwise
+ */
+uint8_t sim_gps_enable();
+
+
+
+/** 
+ * @brief returns the GPS coordinates. The format of the output is longitude,latitude Example: 3937.656010,1406.059400
+ * @param position is used to store the coordinates. 
+ * @return always 1.
+ */
+uint8_t sim_gps_get_location(char* position);
+
+
+
+/** 
+ * @brief returns the speed 
+ * @param char * speed is used to store speed. 
+ * @return always returns 1.
+ */
+uint8_t sim_gps_get_speed(char * speed);
+
+
+
+ /**
+ * @brief disables the GPS functionality of the SIM808 module and the active antenna power supply
+ * @return 1 if the GPS is successfully disabled, 0 otherwise
+ */
+uint8_t sim_gps_disable();
+
+#endif