Dependents: Lab3_Surveillance 6adcSerial
GPS.cpp
- Committer:
- keerthanasp
- Date:
- 2011-02-01
- Revision:
- 1:b4de63a99f18
- Parent:
- 0:14fd31ae13bb
- Child:
- 2:ba6c20754443
File content as of revision 1:b4de63a99f18:
#include "GPS.h" GPS::GPS(PinName tx, PinName rx) : _gps(p13, p14) { _gps.baud(4800); longitude = 0.0; latitude = 0.0; } int GPS::sample() { float time; char ns,ew; int lock; while(1){ getline(); if(sscanf(msg, "GPGGA,%f,%f,%c,%f,%c,%d",&time, &latitude, &ns, &longitude, &ew, &lock) >=1) { if(!lock) { longitude = 0.0; latitude = 0.0; return 0; } else { if(ns =='s') { latitude *= -1.0; } if(ew =='w') { longitude *= -1.0; } float degrees = trunc(latitude / 100.0f); float minutes = latitude - (degrees * 100.0f); latitude = degrees + minutes / 60.0f; degrees = trunc(longitude / 100.0f * 0.01f); minutes = longitude - (degrees * 100.0f); longitude = degrees + minutes /60.0f; return 1; } } } } float GPS::trunc(float v) { if(v < 0.0) { v*= -1.0; v = floor(v); v*=-1.0; } else { v = floor(v); } return v; } void GPS::getline() { while(_gps.getc() != '$'); for(int i=0; i<256; i++) { msg[i] = _gps.getc(); if(msg[i] == '\r') { msg[i] = 0; return; } } error("overflowed message limit"); }