How do I discern Maidenhead Locator from GPS lat long info.

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  1. - 20th May 2018, 18:28 #34
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    astanapane
    astanapane is offline Senior Member
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    Default Re: How do I discern Maidenhead Locator from GPS lat long info.

    I have updated a little bit the code so when there is a no data at portb.0 to have a notice.

    but still i need to fix the following. Is there any advise?

    1. Cannot display the DATE. Something is wrong at my code and there is not proper display of the date.
    2. I have put a loop for display all the factors, because i need to clear the LCD every time something is change. So please could you help me understand how could i manage to display the factors and only change on the fly the ones really going like Time, LAT, LON, GND SPEED, SATs etc.
    3. The Protocol command is not working
    4. The speed is not working properly, i think i need to do better the conversion
    5. The meters are not displaying, there is a wrong value in there.
    6. I need to convert the measurements from the NMEA message LAT and LON to google numbers.


    Code:
    '*  Author  : LEONARDO BILALIS                                  *
'*  Notice  : Copyright (c) 2018 [LEONARDOS BILALIS]            *
'*          : All Rights Reserved                               *
'*  Date    : 12/5/2018                                         *
'*  Version : 1.0                                               *
'*  Notes   : This is an GPS                with ulcd           * 
'*          :                                                   *
'****************************************************************

@ ERRORLEVEL -306 ; this command prevents the compiler to give you a notice of
                  ; crossing page boundary - make sure bits are set 

;& __config _HS_OSC & _WDT_ON & _LVP_OFF & _CP_OFF

Include "MODEDEFS.BAS"
DEFINE OSC 8    
OSCCON=%01111000     '8 Mhz
CMCON = 7            'turn comparators off
ANSEL = 0            'All digital
PORTB = 0            'make low all ports at B range
input portb.0        'make input portb.0


'----------------------------------------------------------------------------/
'                              [ PIC Variables ]                            /  
'--------------------------------------------------------------------------/

PWRLED      var     PORTb.1   ; this shows that the initialization is finished
LCD         var     PORTb.2   ; to LCD operation
GPS_TX      var     PORTb.0   ; info from GPS 
GPS_RX      var     PORTb.4   ; COMMANDS TO GPS
Testled     var     PORTb.5 
dots        var     byte
dots=8
countremain var     byte      ; we use a countremain to check the incoming from portb.0  
pause 1000

' --------------------[ GPS Variables for NMEA sentenses ]---------------------/
'                                                                             /
'   $GPRMC,090045.000,A,3823.6645,N,02353.3600,E,0.02,195.80,170518,,,A*62   /
'   $GNGGA,140405.000,3823.6010,N,02353.3054,E,1,9,0.88,0.8,M,35.9,M,,*40   /
'                                                                          /
'-------------------------------------------------------------------------/

hh          var     byte    'hours
mm          var     byte    'minutes
ss          var     byte    'seconds  
sss         var     word    'milisecs
degrees		VAR     BYTE	'latitude/longitude degrees
minutes		VAR		BYTE	'latitude/Longitude minutes
minutesD	VAR		word	'latitude/LONGITUDE DECIMAL MINUTES
dir       	VAR     BYTE   	' direction (latitude: 0 = N, 1 = S / longitude: 0 = E, 1 = W)
degrees2	VAR     BYTE	'latitude/longitude degrees
minutes2	VAR		BYTE	'latitude/Longitude minutes
minutesD2	VAR		word	'latitude/LONGITUDE DECIMAL MINUTES
dir2        var     byte    ;direction (latitude: 0 = N, 1 = S / longitude: 0 = E, 1 = W)
SatNo   	VAR		BYTE	'number of satellites connected
knots       var     word    'speed over ground
knots2      var     byte    'speed over ground
course      var     word    'course
course2     var     byte    'course
day         var     byte    'day
month       var     byte    'month
year        var     byte    'year
i           var     word    
GNRMC       var     word    'protocol
GNGGA       var     WORD    'protocol
FIX         var     word    'fix sat V/A
Modefix     var     byte    'mode fix 1 or 2 or 3 depens
horizon     var     byte
precision   var     byte
meter       var     byte
METERS      var     byte
Meters2     var     byte

' -------------------------------------------------------------------------/  
'                          [ LCD Initialization ]                         /
'------------------------------------------------------------------------/

serout2 LCD,32,[$55]      ' uOLED Initialize
pause 2000
serout2 lcd,32,[$56,$01]
pause 1000
serout2 lcd,32,[$45]      ' clear the lcd
pause 500
serout2 lcd,32,[$55]
pause 500
serout2 lcd,32,[$45]      ' clesr the lcd
pause 500
serout2 lcd,32,[$73,$00,$03,$11,$ff,$ff," Leonardo Bilalis",$00]
pause 200                       
serout2 lcd,32,[$73,$02,$06,$10,$ff,"     Copyright 2018",$00]
pause 3000
serout2 lcd,32,[$45]
pause 1000
serout2 lcd,32,[$73,$02,$06,$10,$ff,$ff,"      GPS.........",$00]
pause 500
serout2 lcd,32,[$45]
pause 200

'----------------------------------------------------------------------/
'     [ After the lcd initialization we power the Led at PIC ]        /
'--------------------------------------------------------------------/

HIGH pwrled

'-------------------------------------------------------------------/
'                         [MAIN Program]                           /
'-----------------------------------------------------------------/

Main: 
;gosub clearlcd

serin2 gps_tx,84,[countremain]      ; we check what is coming from the port
if countremain = 0 then lostcable   ; if nothing is coming the we check the cable

;gosub clearlcd
'-------------------------------------------------------------------------------/
'                                                                              /
'                    [ Example NMEA Sentense of GNRMC ]                       /
' [$GNRMC,090045.000,A,3823.6645,N,02353.3600,E,0.02,195.80,170518,,,A*62]   /
'                                                                           /
'--------------------------------------------------------------------------/

serin2 gps_tx,84,[wait("$GNRMC"),_                              ;we wait for $GNRMC
wait(","),dec2 hh,dec2 mm,dec2 ss,wait("."),dec3 sss,_          ;we wait for 090045.000
wait(","),fix,_                                                 ;we wait for A
wait(","),dec2 degrees,dec2 minutes,wait("."),dec4 minutesd,_   ;we wait for 3823.6645
wait(","),dir,_                                                 ;we wait for N 
wait(","),dec3 degrees2,dec2 minutes2,wait("."),dec4 minutesd2,_;we wait for 02353.3600
wait(","),dir2,_                                                ;we wait for E
wait(","),dec knots,wait("."),dec2 knots2,_                     ;we wait for 0.02
wait(","),dec3 course,wait("."),_                               ;we wait for 195.80
wait(","),dec2 day,dec2 month,dec2 year]                        ;we wait for 170518

pause 100

'------------------------------------------------------------------------------/
'                                                                             /
'                     [ Example NMEA Sentense of GNGGA ]                     /
' [$GNGGA,140405.000,3823.6010,N,02353.3054,E,1,9,0.88,0.8,M,35.9,M,,*40    /           
'                                                                          /
'-------------------------------------------------------------------------/

serin2 gps_tx,84,[wait("$GNGGA"),_
wait(","),dec2 hh,dec2 mm,dec2 ss,wait("."),dec3 sss,_ 
wait(","),dec2 degrees,dec2 minutes,wait("."),dec4 minutesd,_ 
wait(","),dir,_
wait(","),dec3 degrees2,dec2 minutes2,wait("."),dec4 minutesd2,_
wait(","),dir2,_
wait(","),modefix,_
wait(","),dec2 satno,_
wait(","),dec3 horizon,dec precision,_
wait(","),meter,dec2 METERS,dec Meters2]

pause 100


'---------------------------------------------------------------------------------/
' Here if the GPS module havent been fixed to any satellite will jump to notfix  /
'-------------------------------------------------------------------------------/

if fix = "V" then notfix                                                        
pause 100

'-----------------------------------------------------------------------------/
'                           [ Return from notfix ]                           /
'                   [ We clear any character on the display ]               /
'--------------------------------------------------------------------------/

gosub clearlcd
;serout2 lcd,32,[$45]
;pause 500


'--------------------------------------------------------------------------/
' here is where the code dispays the stored info from the NMEA sentenses  /
'------------------------------------------------------------------------/

serout2 lcd,32,[$73,$03,$00,$00,$ff,$ff,"Protocol:",dec5 GNRMC,$00]
pause 100
serout2 lcd,32,[$73,$00,$02,$00,$ff,$ff,"Date:",dec2 day,dec2 month,dec2 year,$00]
pause 100
serout2 lcd,32,[$73,$00,$04,$00,$ff,$ff,"TIME: ",dec2 hh+3," :",dec2 mm," :",dec2 ss,$00]
pause 100
serout2 lcd,32,[$73,$00,$06,$00,$ff,$ff,"Satellites:",dec2 satno," ","Fixed:",fix,$00]
pause 100
serout2 lcd,32,[$73,$00,$08,$00,$ff,$ff,"Lat : ",dec2 degrees,dec2 minutes,".",dec4 minutesd," ",dir,$00]
pause 100
serout2 lcd,32,[$73,$00,$0A,$00,$ff,$ff,"Lon : ",dec3 degrees2,dec2 minutes2,".",dec4 minutesd2," ",dir2,$00]
pause 100
;serout2 lcd,32,[$73,$00,$0C,$00,$ff,$ff,"GND SPEED : ",(dec knots,".",dec2 knots2)*/1.852,$00]
;pause 200
serout2 lcd,32,[$73,$00,$0E,$00,$ff,$ff,"Meters : ",dec2 METERS,dec Meters2,$00]
pause 3000
serout2 lcd,32,[$45]  ' clears the LCD 
pause 100

        goto main

'-----------------------------------------------------------------------------/
'                              [ SUB ROUTINES ]                              /
'---------------------------------------------------------------------------/

notfix:     ' Still looking for fixed signal
 
serout2 lcd,32,[$73,$00,$03,$11,$ff,$ff,"   Waiting for GPS",$00]
pause 100
serout2 lcd,32,[$73,$03,$06,$10,$ff," Time:",dec2 hh+3," :",dec2 mm," :",dec2 ss,$00]
pause 1000
serout2 lcd,32,[$73,$03,$08,$10,$ff,rep "."\dots,$00]
pause 200
serout2 lcd,32,[$45]  ' clears the LCD 
pause 100

goto main       'returns to main

lostcable:
serout2 lcd,32,[$73,$00,$03,$11,$ff,$ff,"   Connection lost",$00]
pause 100
serout2 lcd,32,[$73,$01,$06,$10,$ff,"   Please check cable",$00]
pause 2000
serout2 lcd,32,[$45]  ' clears the LCD 
pause 100

goto main

'---------------------------------------------------------------------------/
'                              [ CLEAR LCD ]                               /
'-------------------------------------------------------------------------/

Clearlcd:
serout2 lcd,32,[$45]
pause 100
RETURN
    Last edited by astanapane; - 20th May 2018 at 18:38.
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