u-blox / gnss

This class provides an API to communicate with a u-blox GNSS chip. The files here were originally part of the C027_Support library (https://developer.mbed.org/teams/ublox/code/C027_Support/ at revision 138:dafbbf31bf76) but have been separated out, primarily for use on the u-blox C030 board where the cellular interace portion of the C027_Support library will instead be provided through the new mbed Cellular API.

Dependents:   example-ublox-at-cellular-interface-ext example-low-power-sleep example-C030-out-of-box-demo example-C030-out-of-box-demo ... more

Diff: gnss.cpp

Revision:
6:56eda66d585b
Parent:
5:af4baf3c67f3
Child:
7:bfbe9d5d6f56
Child:
8:720841961804
--- a/gnss.cpp	Sun Jun 11 13:45:56 2017 +0000
+++ b/gnss.cpp	Wed Jun 14 20:44:42 2017 +0100
@@ -45,7 +45,7 @@
 
 void GnssParser::powerOff(void)
 {
-    // set the GNSS into backup mode using the command RMX-LPREQ
+    // Set the GNSS into backup mode using the command RMX-LPREQ
     struct { unsigned long dur; unsigned long flags; } msg = {0/*endless*/,0/*backup*/};
     sendUbx(0x02, 0x41, &msg, sizeof(msg));
 }
@@ -103,7 +103,7 @@
     char ch;
     if (++o > len)                      return WAIT;
     if ('$' != pipe->next())            return NOT_FOUND;
-    // this needs to be extended by crc checking 
+    // This needs to be extended by crc checking 
     for (;;)
     {
         if (++o > len)                  return WAIT;
@@ -203,13 +203,13 @@
 
 const char* GnssParser::findNmeaItemPos(int ix, const char* start, const char* end)
 {
-    // find the start
+    // Find the start
     for (; (start < end) && (ix > 0); start ++)
     {
         if (*start == ',')
             ix --;
     }
-    // found and check bounds
+    // Found and check bounds
     if ((ix == 0) && (start < end) && 
         (*start != ',') && (*start != '*') && (*start != '\r') && (*start != '\n'))
         return start;
@@ -221,11 +221,11 @@
 {
     char* end = &buf[len];
     const char* pos = findNmeaItemPos(ix, buf, end);
-    // find the start
+    // Find the start
     if (!pos)
         return false;
     val = strtod(pos, &end);
-    // restore the last character
+    // Restore the last character
     return (end > pos);
 }
 
@@ -233,7 +233,7 @@
 {
     char* end = &buf[len];
     const char* pos = findNmeaItemPos(ix, buf, end);
-    // find the start
+    // Find the start
     if (!pos)
         return false;
     val = (int)strtol(pos, &end, base);
@@ -244,13 +244,13 @@
 {
     const char* end = &buf[len];
     const char* pos = findNmeaItemPos(ix, buf, end);
-    // find the start
+    // Find the start
     if (!pos)
         return false;
-    // skip leading spaces
+    // Skip leading spaces
     while ((pos < end) && isspace(*pos))
         pos++;
-    // check bound
+    // Check bound
     if ((pos < end) && 
         (*pos != ',') && (*pos != '*') && (*pos != '\r') && (*pos != '\n'))
     {
@@ -296,20 +296,25 @@
 
 bool GnssSerial::init(PinName pn)
 {
+    Timer timer;
+    int size;
+    
     // Unused (kept only for compatibility with the I2C version)
     (void)pn;
     
     // Power up and enable the module
     _powerOn();
 
-    // send a byte to wakup the device again
+    // Send a byte to wakup the device again
     putc(0xFF);
-    // wait until we get some bytes
-    int size = _pipeRx.size();
-    Timer timer;
+    // Wait until we get some bytes
+    size = _pipeRx.size();
     timer.start();
-    while ((100 > timer.read_ms()) && (size == _pipeRx.size()))
-        /* nothing / just wait */;
+    while ((timer.read_ms() < 1000) && (size == _pipeRx.size())) {
+        /* Nothing, just wait */
+    }
+    timer.stop();
+    
     return (size != _pipeRx.size());
 }
 
@@ -357,13 +362,13 @@
 
 int GnssI2C::getMessage(char* buf, int len)
 {
-    // fill the pipe
+    // Fill the pipe
     int sz = _pipe.free();
     if (sz) 
         sz = _get(buf, sz);
     if (sz) 
         _pipe.put(buf, sz);
-    // now parse it
+    // Now parse it
     return _getMessage(&_pipe, buf, len);   
 }