Stephen Dickey / Mbed 2 deprecated C027_GPSTransparentI2C_revb

This example establishes a transparent link between the mbed serial port and the gps I2C on the C027. You can use it to use the standard u-blox tools such as u-center. These tools can then connect to the serial port and talk directly to the GPS receiver. Baudrate should be set to 9600 baud and is fixed. m-center can be downloaded from u-blox website following this link: http://www.u-blox.com/en/evaluation-tools-a-software/u-center/u-center.html

Dependencies:   C027-REVB mbed

Fork of C027_GPSTransparentI2C by u-blox

Diff: main.cpp

Revision:
2:832530e30120
Parent:
1:0d32baf4a645
Child:
3:a985a125f9fa
--- a/main.cpp	Fri Oct 25 20:36:35 2013 +0000
+++ b/main.cpp	Fri Oct 25 21:02:16 2013 +0000
@@ -6,21 +6,29 @@
     C027 c027;
     c027.gpsPower(true);
     
-    // open the gps serial port
-    Serial gps(GPSTXD, GPSRXD);
-    gps.baud(GPSBAUD);
+    // open the gps i2c port
+    I2C gps(GPSSDA, GPSSCL);
     
     // open the PC serial port and (use the same baudrate)
     Serial pc(USBTX, USBRX);
     pc.baud(GPSBAUD);
     
+    char buf[2];
+    buf[0] = 0xFF/*REGSTREAM*/;
+    while (gps.write(GPSADR,buf,1,false))
+    {
+         wait_ms(200);
+         printf("$GPTXT,no GPS found\r\n");
+    }     
     while (1)
     {
         // transfer data from pc to gps
-        if (pc.readable() && gps.writeable())
-            gps.putc(pc.getc());
-        // transfer data from gps to pc
-        if (gps.readable() && pc.writeable())
-            pc.putc(gps.getc());
+        if (pc.readable())
+        {
+            buf[1] = pc.getc();
+            gps.write(GPSADR,buf,2,false);
+        }
+        if (pc.writeable() && !gps.read(GPSADR,&buf[1],sizeof(buf[1]),false))
+                pc.putc(buf[1]);
     }
 }