some work done, but i need to test it in a regular C program..

cm_nmea_decoder.c

@@ -5,14 +5,49 @@
  *      Author: Christian Lind Vie Madsen
  */
 
+#include "cm_nmea_decoder.h"
+#include <string.h>
+#define MAX_NMEA_MSG_TYPES 2
+const char *nmea_msg_types[MAX_NMEA_MSG_TYPES] = {"$GPGLL", "$GPGFF"};
+typedef int (*nmeaDecoder_Evt_fpt)(cm_nmea_msg_t *inst, char *str);
+
+static int sGPGLL_decode(char *str){
+
+	//Move pointer until we meet a "," or NULL!
+	while((*str != ",") && (*str != NULL)) str++;
+}
+
+
+nmeaDecoder_Evt_fpt nmea_decodeFuncs[1] = {
+
+};
+
+static int sNMEA_getMsgType(char *str){
+
+	for(int i = 0; i < (MAX_NMEA_MSG_TYPES-1); i++){
+
+		if(strcmp(nmea_msg_types[i], str)) return i;
+	};
+
+	return -1;
+}
+
 int cm_nmea_characterDecode(char in){
 
 
 
 }
 
+// This function returns the message type, so the user knows which message has been decoded!
 int cm_nmea_stringDecode(char *str){
 
+	// Find which type of message we need to decode.
+	int nmea_msg_idx = sNMEA_getMsgType(str);
 
+	// Check if we found a valid NMEA message.
+	if(nmea_msg_idx == -1) return nmea_msg_idx;
+
+	// Use the correct function to decode!
+	if(nmea_msg_idx >= 0) nmea_msg_types[nmea_msg](str);
 
 }

cm_nmea_decoder.h

@@ -10,6 +10,11 @@
 #include <stdio.h>
 #include <stdint.h>
 
+typedef enum {
+
+	NMEA_MSG_GPGLL = 0,
+
+}nmea_msg_type;
 
 typedef struct{
     uint8_t deg;       // Degrees: 0–90 (latitude) or 0–180 (longitude)
@@ -38,7 +43,7 @@ typedef struct {
 		cm_nmea_gpgll_msg gpgll_msg;
 	};
 
-}cm_nmea_msg;
+}cm_nmea_msg_t;