u-blox / C027_Support

support library for C027 helper functions for Buffer Pipes, Buffered Serial Port (rtos capable) and GPS parsing. It includes modem APIs for USSD, SMS and Sockets.

Dependents:   HTTPClient_Cellular_HelloWorld Cellular_HelloMQTT MbedSmartRestMain Car_Bon_car_module ... more

This library is intended to be used with u-blox products such as the C027 or a shield with u-blox cellular and GPS modules like the cellular and positioning shield from Embedded Artist.

For 2G/GSM and 3G/UMTS you need to:

  • have a SIM card and know its PIN number
  • need to know you network operators APN setting These setting should be passed to the connect or init and join functions. You can also extend the APN database in MDMAPN.h.

For CDMA products you need to make sure that you have provisioned and activated the modem with either Sprint or Verizon.

Diff: GPS.cpp

Revision:
3:c7cd4887560d
Parent:
2:b6012cd91657
Child:
4:c959dd4c5fe8
--- a/GPS.cpp	Fri Oct 25 08:47:22 2013 +0000
+++ b/GPS.cpp	Fri Oct 25 09:45:55 2013 +0000
@@ -75,47 +75,45 @@
     return o;
 }
 
-int GPSParser::_putNmea(Stream* stream, const char* buf, int len)
+int GPSParser::sendNmea(const char* buf, int len)
 {
-    stream->putc('$');
-    int c = 0;
-    for (int i = 0; i < len; i ++)
-    {
-        int t = *buf++;
-        stream->putc(t);
-        c ^= t;
-    }
-    stream->putc('*');
-    stream->putc(toHex[(c >> 4) & 0xF]);
-    stream->putc(toHex[(c >> 0) & 0xF]);
-    stream->putc('\r');
-    stream->putc('\n');
-    return len + 6;
+    char head[1] = { '$' };
+    char tail[5] = { '*', 0x00/*crc_high*/, 0x00/*crc_low*/, '\r', '\n' };
+    int i;
+    int crc = 0;
+    for (i = 0; i < len; i ++)
+        crc ^= *buf++;
+    i  = send(head, sizeof(head));
+    i += send(buf, len);
+    tail[1] = toHex[(crc > 4) & 0xF0];
+    tail[2] = toHex[(crc > 0) & 0x0F];
+    i += send(tail, sizeof(tail));
+    return i;
 }
 
-int GPSParser::_putUbx(Stream* stream, const unsigned char cls, unsigned char id, unsigned char* buf, int len)
+int GPSParser::sendUbx(unsigned char cls, unsigned char id, const void* buf, int len)
 {
-    stream->putc('\xB5'); // 'µ'
-    stream->putc('\x62'); // 'b'
-    int ca = cls, cb = cls;
-    stream->putc(cls);
-    ca += id; cb += ca;
-    stream->putc(id);
-    int t = (len >> 0) & 0xFF;
-    ca += t; cb += ca;
-    stream->putc(t);
-    t = (len >> 8) & 0xFF;
-    ca += t; cb += ca;
-    stream->putc(t);
-    for (int i = 0; i < len; i ++)
+    char head[6] = { 0xB5, 0x62, cls, id, len >> 0, len >> 8 };
+    char crc[2];
+    int i;
+    int ca = 0;
+    int cb = 0;
+    for (i = 2; i < 6; i ++)
     {
-        t = *buf++;
-        ca += t; cb += ca;
-        stream->putc(t);
+        ca += head[i];
+        cb += ca;
     }
-    stream->putc(ca & 0xFF);
-    stream->putc(cb & 0xFF);
-    return len + 8;
+    for (i = 0; i < len; i ++)
+    {
+        ca += ((char*)buf)[i];
+        cb += ca;
+    }
+    i  = send(head, sizeof(head));
+    i += send(buf, len);
+    crc[0] = ca & 0xFF;
+    crc[1] = cb & 0xFF;
+    i += send(crc,  sizeof(crc));
+    return i;
 }
 
 const char* GPSParser::findNmeaItemPos(int ix, const char* start, const char* end)
@@ -206,6 +204,18 @@
     return _getMessage(&_pipe, buf, len);   
 }
 
+char GPSSerial::next(void)
+{ 
+    return _pipe.next(); 
+}
+
+int GPSSerial::send(const void* buf, int len)   
+{ 
+    for (int i = 0; i < len; i ++)
+        putc(((char*)buf)[i]); 
+    return len; 
+}
+
 // ----------------------------------------------------------------
 // I2C Implementation 
 // ----------------------------------------------------------------
@@ -236,8 +246,35 @@
     return _getMessage(&_pipe, buf, len);   
 }
 
+int GPSI2C::sendNmea(const char* buf, int len)
+{ 
+    int sent = 0;
+    if (len) 
+    {
+        if (!I2C::write(GPSADR,&REGSTREAM,sizeof(REGSTREAM),true))
+            sent = GPSParser::sendNmea(buf, len);
+        found = len == sent;
+        stop();
+    }
+    return sent;
+}
+
+int GPSI2C::sendUbx(unsigned char cls, unsigned char id, const void* buf, int len)
+{ 
+    int sent = 0;
+    if (len) 
+    {
+        if (!I2C::write(GPSADR,&REGSTREAM,sizeof(REGSTREAM),true))
+            sent = GPSParser::sendUbx(cls, id, buf, len);
+        found = (len == sent);
+        stop();
+    }
+    return sent;
+}
+
 int GPSI2C::_get(char* buf, int len)
 {
+    int read = 0;
     unsigned char sz[2];
     if (!I2C::write(GPSADR,&REGLEN,sizeof(REGLEN),true) && 
         !I2C::read(GPSADR,(char*)sz,sizeof(sz),true))
@@ -246,43 +283,24 @@
         if (size > len)
             size = len;
         if (size > 0)
-        {
-            if (!I2C::read(GPSADR,buf,size))
-            {
-                found = true;
-                return size;
-            }
-            // error reading data
-            found = false;
-            return 0;
-        }
-        else
-        {
-            found = true;
-            // no data -> ok 
-        }
+            read = !I2C::read(GPSADR,buf,size, true) ? size : 0;
+        stop();
+        found = read = size;
     }
     else 
-    {
-        // error setting address and reading length
         found = false;
-    }
     I2C::stop();
-    return 0;
+    return read;
 }
 
-int GPSI2C::_put(const char* buf, int len)
-{
-    if (len == 0)
-        return 0;
-    if (!I2C::write(GPSADR,&REGSTREAM,sizeof(REGSTREAM),true) && 
-        !I2C::write(GPSADR,buf,len,false))
-    {
-        found = true;
-        return len;
-    }
-    found = false;
-    return 0;
+char GPSI2C::next(void)                       
+{ 
+    return _pipe.next(); 
+}
+
+int GPSI2C::send(const void* buf, int len)
+{ 
+    return !I2C::write(GPSADR,(const char*)buf,len,true) ? len : 0; 
 }
 
 const char GPSI2C::REGLEN    = 0xFD;