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

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;