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

main.cpp@4:0e065a08144b, 2013-11-06 (annotated)

Committer:
mazgch
Date:
Wed Nov 06 10:49:39 2013 +0000
Revision:
4:0e065a08144b
Parent:
3:a985a125f9fa
Child:
5:598a573e3ad3
use latest C027 library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mazgch 0:7f124c0a351a 1 #include "mbed.h"
mazgch 1:0d32baf4a645 2 #include "C027.h"
mazgch 0:7f124c0a351a 3
mazgch 3:a985a125f9fa 4 int main()
mazgch 0:7f124c0a351a 5 {
mazgch 1:0d32baf4a645 6 C027 c027;
mazgch 1:0d32baf4a645 7 c027.gpsPower(true);
mazgch 3:a985a125f9fa 8
mazgch 2:832530e30120 9 // open the gps i2c port
mazgch 2:832530e30120 10 I2C gps(GPSSDA, GPSSCL);
mazgch 3:a985a125f9fa 11
mazgch 0:7f124c0a351a 12 // open the PC serial port and (use the same baudrate)
mazgch 0:7f124c0a351a 13 Serial pc(USBTX, USBRX);
mazgch 0:7f124c0a351a 14 pc.baud(GPSBAUD);
mazgch 3:a985a125f9fa 15
mazgch 3:a985a125f9fa 16 while (1)
mazgch 0:7f124c0a351a 17 {
mazgch 0:7f124c0a351a 18 // transfer data from pc to gps
mazgch 4:0e065a08144b 19 int o;
mazgch 4:0e065a08144b 20 char out[256] = { 0xFF, 0x00 /* ... */ };
mazgch 4:0e065a08144b 21 for (o = 1; (o < sizeof(out)) && pc.readable(); )
mazgch 4:0e065a08144b 22 out[o++] = pc.getc();
mazgch 4:0e065a08144b 23 if (o > 1)
mazgch 4:0e065a08144b 24 {
mazgch 4:0e065a08144b 25 if (0 == gps.write(GPSADR,out,o))
mazgch 4:0e065a08144b 26 /*ok*/;
mazgch 4:0e065a08144b 27 }
mazgch 4:0e065a08144b 28
mazgch 4:0e065a08144b 29 const char r = 0xFD;
mazgch 4:0e065a08144b 30 unsigned char sz[2];
mazgch 4:0e065a08144b 31 int s = 0, i;
mazgch 4:0e065a08144b 32 char in[1024];
mazgch 4:0e065a08144b 33 if ( (0 == gps.write(GPSADR,&r,1, true)) &&
mazgch 4:0e065a08144b 34 (0 == gps.read(GPSADR,(char*)sz,2,true)) )
mazgch 2:832530e30120 35 {
mazgch 4:0e065a08144b 36 s = 256 * (int)sz[0] + sz[1];
mazgch 4:0e065a08144b 37 if (s > sizeof(in))
mazgch 4:0e065a08144b 38 s = sizeof(in);
mazgch 4:0e065a08144b 39 if (s > 0)
mazgch 4:0e065a08144b 40 {
mazgch 4:0e065a08144b 41 if (0 != gps.read(GPSADR,in,s,true))
mazgch 4:0e065a08144b 42 s = 0;
mazgch 4:0e065a08144b 43 }
mazgch 2:832530e30120 44 }
mazgch 4:0e065a08144b 45 gps.stop();
mazgch 4:0e065a08144b 46
mazgch 4:0e065a08144b 47 for (i = 0; i < s; i ++)
mazgch 4:0e065a08144b 48 {
mazgch 4:0e065a08144b 49 while (!pc.writeable())
mazgch 4:0e065a08144b 50 /*wait*/;
mazgch 4:0e065a08144b 51 pc.putc(in[i]);
mazgch 4:0e065a08144b 52 }
mazgch 0:7f124c0a351a 53 }
mazgch 0:7f124c0a351a 54 }