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JAM2014
Joined: 24 Apr 2014
Posts: 138
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| time conversion..... |
 Posted: Mon Apr 08, 2019 2:04 pm |
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Hi All,
I'm trying to get a test program to work that will convert a GPS derived time (UTC) into timer ticks, so that I can perform a conversion to local time. At the moment, I'm just trying to convert a fixed time to timer ticks using the 'mktime' function in timer.h. I'm getting a strange error on the call to mktime:
| Quote: | | *** Error 112 "UTCtoLocalTimeConversion.c" Line 41(1,1): Function used but not defined: ... mktime 683 SCR=1580 |
Compiler is PCH 5.050
Here is my test program:
| Code: |
//-----< Include Files, setup fuses >-----
#include <18F14K22.h>
#include <time.h>
//#fuses INTRC, NOWDT, NOPROTECT, NOBROWNOUT, PUT
#fuses INTRC, NOWDT, NOBROWNOUT, PUT, NOPLLEN
// Tell compiler clock speed is 8.00 MHZ
#use delay(clock=8000000)
//-----< General Program Defines >-----
#define Rx_In PIN_B5 // serial data receive pin
#define Tx_Out PIN_B7 // serial data transmit pin
#define Serial_Diag PIN_B4
//-----< Firmware Version >-----
#define VER_MAJ 1 // Major version
#define VER_MIN 3 // Minor version
//-----< Serial Port Definition >-----
#use rs232(baud=19200, xmit=Serial_Diag, stream = LCD)
void main()
{
int32 UTC_Ticks = 0;
//Temorary Test Code
//Needed for the Time Structure in Timer.h....
Struct_tm MyTMInfo;
MyTMInfo.tm_sec = 0; // seconds after the minute (0-59)
MyTMInfo.tm_min = 29; // minutes after the hour (0-59)
MyTMInfo.tm_hour =14; // hours since midnight (0-23)
MyTMInfo.tm_mday = 8; // day of the month (1-31)
MyTMInfo.tm_mon = 4; // month of the year (0-11)
MyTMInfo.tm_year = 119; // years since 1900
MyTMInfo.tm_wday = 1; // day of the week (0-6) (Sunday=0)
MyTMInfo.tm_yday = 98; // day of the year (0-365)
UTC_Ticks = mktime(&MyTMInfo);
fprintf(LCD, "\r\nTimestamp:<%Lu>",UTC_Ticks);
while(1){}
} //Main
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Appreciate any suggestions to get this working!
Thanks,
Jack |
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temtronic
Joined: 01 Jul 2010
Posts: 9133
Location: Greensville,Ontario
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| Posted: Mon Apr 08, 2019 2:33 pm |
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OK, humor the old guy whose been up waaay to long ...
this
Struct_tm MyTMInfo
I can't see where or how you tell the compiler the structure is composed of bits, bytes, words, ???? Since a 'structure' can be composed of several 'elements', they could be bits or bytes or words or a mix.....
If I'm totally wrong, tell me....
Jay |
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JAM2014
Joined: 24 Apr 2014
Posts: 138
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| Posted: Mon Apr 08, 2019 2:52 pm |
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Hi Jay,
That is the declaration of the structure. The actual definition of the structure occurs in Timer.h
Thanks,
Jack |
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empty
Joined: 13 Jan 2018
Posts: 14
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| Posted: Mon Apr 08, 2019 3:25 pm |
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Directly after:
#include <time.h>
add:
#include <time.c> |
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JAM2014
Joined: 24 Apr 2014
Posts: 138
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| Posted: Tue Apr 09, 2019 3:31 pm |
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Hi,
Doh! Yes, of course, I can't believe I missed that!
Here is some working test code for UTC to local time conversion:
| Code: |
//-----< Include Files, setup fuses >-----
#include <18F14K22.h>
#include <time.h>
#include <time.c>
//#fuses INTRC, NOWDT, NOPROTECT, NOBROWNOUT, PUT
#fuses INTRC, NOWDT, NOBROWNOUT, PUT, NOPLLEN
// Tell compiler clock speed is 8.00 MHZ
#use delay(clock=8000000)
//-----< General Program Defines >-----
#define Rx_In PIN_B5 // serial data receive pin
#define Tx_Out PIN_B7 // serial data transmit pin
#define Serial_Diag PIN_A2
#define Time_Valid PIN_C5
//-----< Firmware Version >-----
#define VER_MAJ 1 // Major version
#define VER_MIN 3 // Minor version
//-----< Serial Port Definition >-----
#use rs232(baud=19200, xmit=Serial_Diag, stream = LCD)
void main()
{
int32 UTC_Ticks = 0;
int32 LCL_Ticks = 0;
int8 iIndex = 0;
int8 tUTCString[80];
int8 tLCLString[80];
//Here we blink the Valid Time LED at power up
for ( iIndex=0 ; iIndex<3 ; iIndex++ )
{
output_high(Time_Valid);
delay_ms(250);
output_low(Time_Valid);
delay_ms(250);
}
//Here we clear the Hyperterminal display screen
fprintf(LCD, "\x1B[2J");
fprintf(LCD, "Time Conversion Test!\n\r");
//Temorary Test Code
//Needed for the Time Structure in Timer.h....
Struct_tm MyTMInfo;
MyTMInfo.tm_sec = 0; // seconds after the minute (0-59)
MyTMInfo.tm_min = 29; // minutes after the hour (0-59)
MyTMInfo.tm_hour =14; // hours since midnight (0-23)
MyTMInfo.tm_mday = 8; // day of the month (1-31)
MyTMInfo.tm_mon = 3; // month of the year (0-11) <- Note: April = 3 NOT 4!!
MyTMInfo.tm_year = 119; // years since 1900
MyTMInfo.tm_wday = 0; // day of the week (0-6) (Sunday=0)
MyTMInfo.tm_yday = 0; // day of the year (0-365) - was 98
UTC_Ticks = mktime(&MyTMInfo);
fprintf(LCD, "\r\nUTC Timestamp:<%Lu>\n\r",UTC_Ticks);
ctime(&UTC_Ticks, tUTCString);
fprintf(LCD, "Current UTC Time: %s\n\r", tUTCString);
//Here we apply a 'UTC offset' of 4 hours (4 hours * 3600 secs/hr = 14400 secs). This is for illustration only, and will be handled as
//a variable in the final code.
LCL_Ticks = UTC_Ticks - 14400;
ctime(&LCL_Ticks, tLCLString);
fprintf(LCD, "Current Local Time: %s\n\r", tLCLString);
while(1){}
} //Main
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| Quote: |
Time Conversion Test!
UTC Timestamp:<1554733740>
Current UTC Time: Mon Apr 8 14:29:00 2019
Current Local Time: Mon Apr 8 10:29:00 2019
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Thanks,
Jack |
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