Ch4_4. GPS모듈 연결하여 위치좌표 구하기

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Ch4_4. GPS모듈 연결하여 위치좌표 구하기

Page last updated 27 Aug 2011, by Eui-Seok Hong. 1 reply

학습 내용

GlobalSat EM-406 GPS모듈을 mbed에 연결하여 위치좌표를 시리얼통신을 통해 PC에 나타내는 학습을 합니다

/media/uploads/jnesystech/gpsproduct.jpg

배선도 & 회로도

/media/uploads/jnesystech/gpsschematic.png

VCC :5v
Tx :mbed serial rx (e.g. p10)
Rx :mbed serial tx (e.g. p9)
GND :0v/GND

배선 사진

/media/uploads/jnesystech/gpsphoto.jpg

코딩

#include "mbed.h"
#include "GPS.h"

Serial pc(USBTX, USBRX);
GPS gps(p9, p10);

int main() {
    while(1) {
        if(gps.sample()) {
            pc.printf("I'm at %f, %f\n", gps.longitude, gps.latitude);
        } else {
            pc.printf("Oh Dear! No lock :(\n");
        }
    }
}

Import program
GPS_HelloWorld - File list

main.cpp [code]

라이브러리

EM-406 GPS Library

Import library
GPS - GPS Class Reference

Public Member Functions
	GPS (PinName tx, PinName rx)
	Create the GPS interface, connected to the specified serial port.
int	sample ()
	Sample the incoming GPS data, returning whether there is a lock.
Data Fields
float	longitude
	The longitude (call sample() to set)
float	latitude
	The latitude (call sample() to set)

Import library
GPS - File list

GPS.cpp [code]
GPS.h [code]

Import library
GPS - Function list

No documentation found.

학습 참고

1 comment on Ch4_4. GPS모듈 연결하여 위치좌표 구하기:

Hemendra Arya

# 13 Mar 2013

include the mbed library with this snippet

#include "mbed.h"
#include "GPS.h"
 
Serial pc(USBTX, USBRX);
GPS gps(p9, p10);
 
int main() {
    while(1) {
        if(gps.sample()) {
            pc.printf("I'm at %f, %f\n", gps.longitude, gps.latitude);
        } else {
            pc.printf("Oh Dear! No lock :(\n");
        }
    }
}

I tried this code with a GTPA010 GPS module. Code runs, with no compiling error. But I am getting no output at all. The GPS blinks continuously.

If the GPS couldnt find the NMEA string, according to the code, mbed should atleast say "Oh Dear! No lock :( " in the Tera Term but I dont receive any serial output.

I checked 4800, 9600, 38400 baud rates. No improvements.

Although, I see a strange thing happening. All the Leds in the mbed board starts blinking after 15 - 20 mins.

Please provide suggestions.

- Thanks, Abhilash

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