Amicus 18 GPS Shield date issue.


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    Senior Member Mellbreak's Avatar
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    Default Amicus 18 GPS Shield date issue.

    I wonder if those of you with an Amicus 18 GPS shield have noticed that there is a wee issue with the date that the GPS unit produces - it's about 19 years adrift. It would seem that, as a consequence of a recent GPS week roll-over which happened in April this year (2019), the date produced by the ZX4120 is incorrect. The code below is an attempt to correct that problem. Essentially what the program does is look at the date the GPS module produces and convert it into the appropriate number of days. A correction factor (7168 days) is then added. The days are then converted back to years, months and days. Leap years are accounted for during the conversion process.

    I've stolen some code from both Les and Tim. Thanks to both. Any problems, or if you have a more elegant solution, please share.

    Bob

    Code:
    '****************************************************************
    '*  Name    : GPS_Date_ Correction.BAS                          *
    '*  Author  : Bob Marshall                                      *                             
    '*  Date    : 11/9/2019                                         *
    '*  Version : 1.0                                               *
    '*  Notes   : This program demonstrates how to correct the      *
    '*          : date anomaly found on the Amicus 18 GPS shield.   *
    '*          : The anomaly is a consequence of a GPS week        *
    '*          : roll-over in April 2019. This results in the date *
    '*          : output from the GPS module being approximately    *
    '*          : 19 years out!                                     *
    '****************************************************************
    
        Include "Amicus18.inc"                          ' Configure the compiler to use a PIC18F25K20 at 64MHz. i.e. An Amicus18 board
       
        Declare Serial_Baud = 9600                      ' GPS receiver baud rate
        Declare RsIn_Timeout = 1000                     ' Set the Rsin timeout to 1 second (1000ms)  
        Declare RsIn_Pin = PORTA.0                      ' From GPS receiver TX line
        Declare RsIn_Mode = 0                           ' Non-Inverted serial data
        
        Declare Optimiser_Level = 3                     ' Maximum optimisation        
        Declare Dead_Code_Remove = On                   ' Squeeze the code a bit more
        
        Dim GPS_buffer [60] As Byte                     'GPS data buffer
        Dim TempVar As Word                             'Gen reusable variable
        Dim Loop2 As Byte                               'Gen. loop variable
        Dim Loop1 As Byte                               'Gen. loop variable
        
        Dim Year As Byte
        Dim Month As Byte
        Dim Day As Byte
        Dim Hour As Byte
        Dim Minute As Byte
        Dim Second As Byte
        
        Dim LeapDays As Byte                                  
        Dim LeapYearFlag As Byte                        ' 0 if it's a leap year.
        Dim Total_Days As Dword                         ' Total number of days since 1/1/2000.
        Dim Complete_Years_Days As Word                 ' = Years since (2000 * 365) + leap year days. 
        Dim CurrentYearDays As Word                     ' Days since the beginning of the current year.
        
        Symbol GPS_Day = Day                            ' Aliases used to made the code clearer - I hope!
        Symbol GPS_Month = Month
        Symbol GPS_Year = Year
        Symbol GPS_LeapYearFlag = LeapYearFlag
    
    '******************************************************************************
    ' Main program loop
    '******************************************************************************
    Main:
    
      While   
        ExtractDateTime()
        CalcNumDays()
        CalcCorrectDate()   
        HSerOutln ["Current Time = ",Dec2 Hour,":",Dec2 Minute,":",Dec2 Second,"    ", Dec2 Day, "-", Dec2 Month, "-", Dec2 Year,10,13] 
      Wend 
      
    '******************************************************************************
    ' Extract the time and incorrect GPS date.
    '******************************************************************************
    ' Based on code by Les Johnson, many thanks Les.
    
    Proc ExtractDateTime()
    
     RsIn Wait("$GPRMC,"),Str GPS_buffer\56 'Extract the $GPRMC String from the GPS data
    
    'Extract the date information. This is not fixed but occurs after 8th comma.
        Loop1 = 0:Loop2 = 0:TempVar = 0
        Repeat
          If GPS_buffer[Loop2] = "," Then Inc TempVar' Count the number of commas       
          Inc Loop2
        Until TempVar = 8
    
    'Convert numeric data in ASCII format to unsigned integer.
        Repeat 
            GPS_buffer[Loop1] = GPS_buffer[Loop1] - 48 
            Inc Loop1
        Until Loop1 > 57
        
    ' Extract the time of day.   
        Hour =   (GPS_buffer#0 * 10) + GPS_buffer#1
        Minute = (GPS_buffer#2 * 10) + GPS_buffer#3
        Second  = (GPS_buffer#4 *10) + GPS_buffer#5  
        
    'Extract the (incorrect) date from the buffer. 
        GPS_Day = GPS_buffer[Loop2]*10 + GPS_buffer[Loop2+1]
        GPS_Month = GPS_buffer[Loop2+2]*10 + GPS_buffer[Loop2+3]
        GPS_Year = GPS_buffer[Loop2+4]*10 + GPS_buffer[Loop2+5]
      
     EndProc
        
    '******************************************************************************
    ' Calculate number of days elapsed since 1/1/2000 (GPS date + 7168)
    '******************************************************************************
    ' Based on the work of Tim Box. Many thanks Tim.
    
    
    Proc CalcNumDays()
        
        Complete_Years_Days=0 : Total_Days=0
        
        If GPS_Year>0 Then
            Complete_Years_Days = GPS_Year*365+(GPS_Year/4) 
        EndIf
               
        If GPS_Month > 1 Then    
            TempVar = LookUpL (GPS_Month - 2),[31,59,90,120,151,181,212,243,273,304,334]
            Total_Days = Complete_Years_Days + TempVar
        Else
            Total_Days= Complete_Years_Days 
        EndIf
        
        GPS_LeapYearFlag  = GPS_Year//4 ' If 0 then GPS thinks it's a leap year
     
        If GPS_Month > 2 And GPS_LeapYearFlag = 0 Then Total_Days=Total_Days+1 'Add 1 if the current year is leap, and the month >2
    
        Total_Days = Total_Days + GPS_Day + 7168 'Add the current month days- add 7168 correction factor
    
    EndProc
    
    
    '******************************************************************************
    ' Calculate the correct date
    '******************************************************************************
    
     Proc CalcCorrectDate()
                          
        Year =  ((Total_Days-1) * 100)/36525 'Calculate the number of years since 2000
     
        CurrentYearDays = Total_Days -(Year *  365 + Year/4) 'Gives days elapsed for current year   
        LeapYearFlag = Year//4  'Check to see if it's a leap year
                                                                
    'Now convert remaining days to months and day date. 
    
        If LeapYearFlag <> 0 Then 'Not a leap year.
        Dec CurrentYearDays        
         Select CurrentYearDays
            Case < 32                      
                Month = 1
                TempVar = 0
            Case < 60
                Month = 2
                TempVar = 31       
            Case < 91
                Month = 3
                TempVar = 59
            Case < 121
                Month = 4
                TempVar = 90
            Case < 152
                Month = 5
                TempVar = 120
            Case < 182
                Month = 6
                TempVar = 151
            Case < 213
                Month = 7
                TempVar = 181
            Case < 244
                Month = 8
                TempVar = 212
            Case < 274
                Month = 9
                TempVar = 243
            Case < 305
                Month = 10
                TempVar = 273
            Case < 335
                Month = 11
                TempVar = 304
            Case < 367
                Month = 12        
                TempVar = 334
        EndSelect 
        EndIf 
        
        If LeapYearFlag = 0 Then  'Leap year
        Select CurrentYearDays
            Case < 32
                Month = 1
                TempVar = 0
            Case < 61
                Month = 2
                TempVar = 31       
            Case < 92
                Month = 3
                TempVar = 60
            Case < 122
                Month = 4
                TempVar = 91
            Case < 153
                Month = 5
                TempVar = 121
            Case < 183
                Month = 6
                TempVar = 152
            Case < 214
                Month = 7
                TempVar = 182
            Case < 245
                Month = 8
                TempVar = 213
            Case < 275
                Month = 9
                TempVar = 244
            Case < 306
                Month = 10
                TempVar = 274
            Case < 336
                Month = 11
                TempVar = 305
            Case < 367
                Month = 12        
                TempVar = 335
        EndSelect 
        EndIf   
        Day = CurrentYearDays - TempVar
     EndProc
    Last edited by Mellbreak; 14th November 2019 at 18:07.

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  • #2
    Prolific Poster RGV250's Avatar
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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,
    Should you not be using GPZDA

    UTC day, month, and year, and local time zone offset

    An example of the ZDA message string is:
    $GPZDA,172809.456,12,07,1996,00,00*45
    ZDA message fields

    0 Message ID $GPZDA
    1 UTC
    2 Day, ranging between 01 and 31
    3 Month, ranging between 01 and 12
    4 Year
    5 Local time zone offset from GMT, ranging from 00 through 13 hours
    6 Local time zone offset from GMT, ranging from 00 through 59 minutes
    7 The checksum data, always begins with *

    Fields 5 and 6 together yield the total offset. For example, if field 5 is -5 and field 6 is +15, local time is 5 hours and 15 minutes earlier than GMT.
    NMEA reference https://www.sparkfun.com/datasheets/...ce Manual1.pdf

    Regards,
    Bob
    Last edited by RGV250; 14th November 2019 at 18:21.

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,

    $GPRMC should be fine as it has both the time and date fields present. I haven't looked at $GPZDA, but I can't see the unit offering two different dates.

    Bob
    Last edited by Mellbreak; 14th November 2019 at 18:40.

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,
    The difference is that in ZDA it is in 3 seperate variables rather than one, I am away this weekend and I have the shield as well, I also should have my original code so i will have a look unless you beat me too it.
    I cannot see that the GPS signal would be wrong as that would mean hundreds of thousnads of GPS sold would have an issue.

    Bob

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,

    A couple of things, firstly I don't think that the ZX4120 decodes the ZDA sentence - at least mine doesn't appear to do so. Secondly, most GPS units will be unaffected by this roll-over issue. The ZX4120 is an old module and does not appear to have any firmware updates available. I'd be very interested to hear what results you get with your shield Bob. Many thanks for taking the time to reply.

    Cheers,

    Bob

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,
    Have a look here, according to the datasheet it supports it.
    http://www.protonbasic.co.uk/vbdownloads.php?do=download&downloadid=407

    I have just found my original code which has an example to extract the speed from GPVTG, I am sure it can be modified easily to use GPZDA.
    If you PM me your email I can send it to you, it will need tweaking as it is from 2008 so will not compile.

    Bob
    Last edited by RGV250; 14th November 2019 at 21:16.

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    Senior Member Mellbreak's Avatar
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    Default Re: Amicus 18 GPS Shield date issue.

    Yes, I had a look at the datasheet Bob. Despite what it says, my modules will not decode the ZDA or the GLL sentences. GGA, GSA, GSV , RMC and VTG are all OK.


    Bob
    Last edited by Mellbreak; 14th November 2019 at 21:45.

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi,
    I will try to have a play over the weekend, I have just dug my original board out which was a BT406 I think but the code was based on the 4140.

    Bob

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,
    Have a look at page 5 of the manual, the way I read that is that GGA, GSA, GSV, RMC and VTC are sent by default, the rest are not.
    Pages 21 & 25 seem to imply that if you initialise the GPS module with a command string it then sends out different strings, I think 25 is the order and 21 is for the rate which is probably optional.

    Bob

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,
    I think you need to send this to the module $PNMRX108,GGA,GSA,GSV,RMC,VTG,ZDA*70

    I used this calculator http://www.hhhh.org/wiml/proj/nmeaxor.html found on Sparkfun site to calculate the checksum.

    Regards,
    Bob
    Last edited by RGV250; 14th November 2019 at 23:43.

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi Bob,

    I've now got my unit outputting the ZDA sentence. As I expected the date is incorrect here too. It shows today's date (15/11/2019) as 31/03/2000. Thanks for the pointers on getting the module to produce ZDA BTW, much appreciated.

    Bob

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi,
    That seems strange as I was under the impression that it was embedded in the GPS message, anyway, can you post your code so I can have a play over the weekend without re-inventing the wheel.

    Bob

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    Default Re: Amicus 18 GPS Shield date issue.

    Bob,

    The code I've been using is that from post 1. I've also connected the GPS shield directly to serial terminal software and observed the unit's output. On my shield with a ZX4120 receiver the date is consistent in both the ZDA and RMC sentences. However, as said previously, its wrong.

    My understanding is that the date which is output from the receiver is calculated from the GPS week number and the seconds that have elapsed from the beginning of the current week. Most units I know of have coped with the roll-over without issue. The one on your board may do likewise. However, the version of the
    ZX4120 that I have definitely has a problem.

    Cheers,

    Bob
    Last edited by Mellbreak; 15th November 2019 at 13:09.

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    Default Re: Amicus 18 GPS Shield date issue.

    Hi,
    Re the code I was thinking about he ZDA stuff.
    Interesting that in the manual it states 1980-2079.

    How is the accuracy of the GPS?

    Bob
    Last edited by RGV250; 15th November 2019 at 13:12.

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    Default Re: Amicus 18 GPS Shield date issue.

    I've just been using a serial terminal to investigate the ZDA stuff Bob. Just done a factory reset and got the message "$PNMRX600,0,NemeriX NS1030A, SW Release Version 4.0.13_PROD, Welcome On Board! *06" back in return for my efforts. The date fields are still wrong. :-(

    Bob

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