eichi kowata / Mbed 2 deprecated geiger

http://http://diytec.web.fc2.com/mark2r2/

Dependencies:   EthernetNetIf NTPClient_NetServices mbed ConfigFile

GPS/GPS.cpp@0:08a4d61cd84c, 2011-09-20 (annotated)

Committer:
mark2r2
Date:
Tue Sep 20 12:46:26 2011 +0000
Revision:
0:08a4d61cd84c
V1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mark2r2 0:08a4d61cd84c 1 /* mbed EM-406 GPS Module Library
mark2r2 0:08a4d61cd84c 2 * Copyright (c) 2008-2010, sford
mark2r2 0:08a4d61cd84c 3 *
mark2r2 0:08a4d61cd84c 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
mark2r2 0:08a4d61cd84c 5 * of this software and associated documentation files (the "Software"), to deal
mark2r2 0:08a4d61cd84c 6 * in the Software without restriction, including without limitation the rights
mark2r2 0:08a4d61cd84c 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
mark2r2 0:08a4d61cd84c 8 * copies of the Software, and to permit persons to whom the Software is
mark2r2 0:08a4d61cd84c 9 * furnished to do so, subject to the following conditions:
mark2r2 0:08a4d61cd84c 10 *
mark2r2 0:08a4d61cd84c 11 * The above copyright notice and this permission notice shall be included in
mark2r2 0:08a4d61cd84c 12 * all copies or substantial portions of the Software.
mark2r2 0:08a4d61cd84c 13 *
mark2r2 0:08a4d61cd84c 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mark2r2 0:08a4d61cd84c 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mark2r2 0:08a4d61cd84c 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mark2r2 0:08a4d61cd84c 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mark2r2 0:08a4d61cd84c 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mark2r2 0:08a4d61cd84c 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mark2r2 0:08a4d61cd84c 20 * THE SOFTWARE.
mark2r2 0:08a4d61cd84c 21 */
mark2r2 0:08a4d61cd84c 22
mark2r2 0:08a4d61cd84c 23 #include "GPS.h"
mark2r2 0:08a4d61cd84c 24
mark2r2 0:08a4d61cd84c 25 GPS::GPS(PinName tx, PinName rx) : _gps(tx, rx) {
mark2r2 0:08a4d61cd84c 26 _gps.baud(4800);
mark2r2 0:08a4d61cd84c 27 longitude = 0.0;
mark2r2 0:08a4d61cd84c 28 latitude = 0.0;
mark2r2 0:08a4d61cd84c 29 }
mark2r2 0:08a4d61cd84c 30
mark2r2 0:08a4d61cd84c 31 int GPS::sample() {
mark2r2 0:08a4d61cd84c 32 float time;
mark2r2 0:08a4d61cd84c 33 char ns, ew;
mark2r2 0:08a4d61cd84c 34 int lock;
mark2r2 0:08a4d61cd84c 35
mark2r2 0:08a4d61cd84c 36 while(1) {
mark2r2 0:08a4d61cd84c 37 getline();
mark2r2 0:08a4d61cd84c 38
mark2r2 0:08a4d61cd84c 39 // Check if it is a GPGGA msg (matches both locked and non-locked msg)
mark2r2 0:08a4d61cd84c 40 if(sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%d", &time, &latitude, &ns, &longitude, &ew, &lock) >= 1) {
mark2r2 0:08a4d61cd84c 41 if(!lock) {
mark2r2 0:08a4d61cd84c 42 longitude = 0.0;
mark2r2 0:08a4d61cd84c 43 latitude = 0.0;
mark2r2 0:08a4d61cd84c 44 return 0;
mark2r2 0:08a4d61cd84c 45 } else {
mark2r2 0:08a4d61cd84c 46 if(ns == 'S') { latitude *= -1.0; }
mark2r2 0:08a4d61cd84c 47 if(ew == 'W') { longitude *= -1.0; }
mark2r2 0:08a4d61cd84c 48 float degrees = trunc(latitude / 100.0f);
mark2r2 0:08a4d61cd84c 49 float minutes = latitude - (degrees * 100.0f);
mark2r2 0:08a4d61cd84c 50 latitude = degrees + minutes / 60.0f;
mark2r2 0:08a4d61cd84c 51 degrees = trunc(longitude / 100.0f * 0.01f);
mark2r2 0:08a4d61cd84c 52 minutes = longitude - (degrees * 100.0f);
mark2r2 0:08a4d61cd84c 53 longitude = degrees + minutes / 60.0f;
mark2r2 0:08a4d61cd84c 54 return 1;
mark2r2 0:08a4d61cd84c 55 }
mark2r2 0:08a4d61cd84c 56 }
mark2r2 0:08a4d61cd84c 57 }
mark2r2 0:08a4d61cd84c 58 }
mark2r2 0:08a4d61cd84c 59
mark2r2 0:08a4d61cd84c 60 float GPS::trunc(float v) {
mark2r2 0:08a4d61cd84c 61 if(v < 0.0) {
mark2r2 0:08a4d61cd84c 62 v*= -1.0;
mark2r2 0:08a4d61cd84c 63 v = floor(v);
mark2r2 0:08a4d61cd84c 64 v*=-1.0;
mark2r2 0:08a4d61cd84c 65 } else {
mark2r2 0:08a4d61cd84c 66 v = floor(v);
mark2r2 0:08a4d61cd84c 67 }
mark2r2 0:08a4d61cd84c 68 return v;
mark2r2 0:08a4d61cd84c 69 }
mark2r2 0:08a4d61cd84c 70
mark2r2 0:08a4d61cd84c 71 void GPS::getline() {
mark2r2 0:08a4d61cd84c 72 while(_gps.getc() != '$'); // wait for the start of a line
mark2r2 0:08a4d61cd84c 73 for(int i=0; i<256; i++) {
mark2r2 0:08a4d61cd84c 74 msg[i] = _gps.getc();
mark2r2 0:08a4d61cd84c 75 if(msg[i] == '\r') {
mark2r2 0:08a4d61cd84c 76 msg[i] = 0;
mark2r2 0:08a4d61cd84c 77 return;
mark2r2 0:08a4d61cd84c 78 }
mark2r2 0:08a4d61cd84c 79 }
mark2r2 0:08a4d61cd84c 80 printf("Overflowed message limit");
mark2r2 0:08a4d61cd84c 81 }