Diff: MTK3339.cpp

Revision:

4:c9861b0d3219

Parent:

3:124e25586234

--- a/MTK3339.cpp	Sun Aug 23 21:48:48 2015 +0000
+++ b/MTK3339.cpp	Tue Dec 29 16:46:07 2015 +0000
@@ -1,6 +1,5 @@
-// Class to represent serial interface to MTK3339 GPS chip
 // Original author: Embedded Artists
-// Revised by T. Bronez, 2015-08-23
+// Revised by T. Bronez, 2015-12-16
 
 #include "mbed.h"
 #include "MTK3339.h"
@@ -39,6 +38,10 @@
         _sentenceMask = mask;
         _serial.attach(this, &MTK3339::uartIrq, Serial::RxIrq);
     }
+
+    // DEBUG: Query antenna status    
+    //_serial.printf("$PGTOP,11,3*6F\r\n");
+    //_serial.printf("$PGCMD,33,1*6C\r\n");
 }
 
 void MTK3339::stop() {
@@ -264,6 +267,8 @@
             break;
         }
 
+        //printf("msg: %s\n", data); // DEBUG
+        
         // Save appropriate sentence for later decoding   
         if (strncmp("$GPRMC", data, 6) == 0 && (_sentenceMask & NMEA_RMC) != 0) {
             //flashLED2();    // for DEBUG
@@ -295,7 +300,7 @@
             _availDataType = NMEA_VTG;
             _dataCallback.call();
             _availDataType = NMEA_NONE;
-        }          
+        }
     } while(0);
 }
 
@@ -329,4 +334,27 @@
     }
 }
 
+/*
+ From http://forum.trenz-electronic.de/index.php?topic=273.0
+ (untested), other MTK3339 commands and responses:
+ 
+ To disable antenna status/advisor messages,
+    $PGCMD,33,0*6D<CR><LF>
+    
+ MTK3339 should acknowledge with
+    $PGACK,33,0*6E<CR><LF>
 
+ To enable antenna status/advisor messages,
+    $PGCMD,33,1*6C<CR><LF>
+    
+ MTK3339 should acknowledge with
+    $PGACK,33,1*6F<CR><LF>
+
+ To query antenna status,
+    $PGTOP,11,3*6F<CR><LF>
+    
+ MTK3339 should respond with one of the following:
+    $PGTOP,11,1*6D  active antenna shorted
+    $PGTOP,11,2*6E  using internal antenna
+    $PGTOP,11,3*6F  using active antenna
+*/