RTOS/EK-TM4C1294XL: How to set reference time for TI RTOS ?

Hae Ryong Jung

Expert 2150 points

Part Number: EK-TM4C1294XL
Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

Hi All,

Would you please let me know how to set initial time value for RTOS ?

I have used following example code of Second_set(), but it seems not correct.

  #include <ti/sysbios/hal/Seconds.h>
  #include <time.h>

  time_t t;
  struct tm *ltm;
  char *curTime;

  Seconds_set(STARTTIME);

  t = time(NULL);
  ltm = localtime(&t);
  curTime = asctime(ltm);
  System_printf("Time(GMT): %s\n", curTime);

I have used STARTTIME as 1480877209 which is unix epoch time of 2016-12-04T18:46:49Z (I got this value at wiki page )

but the result is Sun Oct 29 12:18:33 1950.

I have heard that TI RTOS time base is Jan, 1, 1900. so I have added 2208988800 (which is elapsed second of Jan 1, 1970) it cannot be covered by uint32 type. (overflow happened)

Would you let me know what value is correct reference value for RTOS ?

Best Regards,

Hae Ryong

over 8 years ago

0 Ashish Kapania over 8 years ago

TI__Mastermind 21645 points

Hi Hae,

I tried your example code in a TIVA project and get the right date. I am unable to reproduce the problem. Can you share your application's cfg file ?

Hae Ryong Jung said:

I have heard that TI RTOS time base is Jan, 1, 1900. so I have added 2208988800 (which is elapsed second of Jan 1, 1970) it cannot be covered by uint32 type. (overflow happened)

It is not that TI-RTOS is setting a time base of Jan 1, 1900. The time() C runtime API shipped with TI codegen tools returns the number of seconds since 1900. Therefore, TI-RTOS time() implementation adjusts the returned time. You should not have to do anything special in your code.

Best,

Ashish

0 Ashish Kapania over 8 years ago in reply to Ashish Kapania

TI__Mastermind 21645 points

Adding to my previous post:

I presume you are using TI code-gen tools. Can you confirm that ?

Best,
Ashish

0 Hae Ryong Jung over 8 years ago in reply to Ashish Kapania

Expert 2150 points

Hi Ashish,

Thanks for your feedback.

I'm just copied sample snippet from API document located as follows

C:/ti/tirtos_tivac_2_16_01_14/products/bios_6_45_02_31/docs/cdoc/index.html -> ti -> sysbios -> hal -> Seconds

would you please provide your sample code or let me know what example you are using with what STARTTIME value ?

I'd like to try yours.

please refer to my cfg file. if you find anything wrong, just let me know.

5314.base.cfg

Thanks for your support, and Happy Christmas !

Best Regards,

Hae Ryong

0 Ashish Kapania over 8 years ago in reply to Hae Ryong Jung

TI__Mastermind 21645 points

Hi Hae,

Attached please find my test TI-RTOS project. I used TI-RTOS 2.16.1.14 for TivaC to build the project.

Thanks and wish you a very Merry Christmas too!

Best,

Ashish

1665.hello_DK_TM4C129X_TI_TivaTM4C129XNCZAD.zip

0 Hae Ryong Jung over 8 years ago in reply to Ashish Kapania

Expert 2150 points

Hi Ashish,

Thanks for your support.

I can verify your example works fine.
Maybe I have got some confusion about base value of epoch time.

I wish you have a happy new year !

Best Regards,
Hae Ryong

0 Ashish Kapania over 8 years ago in reply to Hae Ryong Jung

TI__Mastermind 21645 points

Thanks and Wish you a very happy new year too!

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RTOS/EK-TM4C1294XL: How to set reference time for TI RTOS ?