CODEWITHSUNDEEP
cdatemicrocontrollerepoch
Darshan Prajapati
Darshan Prajapati

Reputation: 843

Why gmtime() function returns NULL?

I am trying to set RTC time on STM32L051T6 microcontroller using epoch time. So following is my code.

void Rtc_SetTime(uint32_t time_)
{
    struct tm* brokenTime;
    const time_t temp = 3600;

    brokenTime = gmtime(&temp);

    if (NULL == brokenTime)
    {
       printf("Error: Failed to convert time.\r\n");
    }
}

When I call above function. It always goes to if statement and prints Error. I have tried passing values 3600, 1459841178 as arguments. All fails. What is wrong with the code?

Upvotes: 2

Views: 2693

Answers (2)

Darshan Prajapati
Darshan Prajapati

Reputation: 843

I used localtime() function instead of gmtime() and it works well solving my purpose.

Upvotes: 0

Serve Laurijssen
Serve Laurijssen

Reputation: 9753

I found the following here: http://support.raisonance.com/content/gmtime-and-localtime-broken-arm-gcc-lib

So it might not be implemented....

I think gmtime and localtime is broken in arm-gcc lib for STM32F10x.

I have try it in keil uVision and working fine there(localtime anyway, gmtime not implemented in keil). gmtime and localtime is searching for _sbrk when linking.

"sbrkr.c: (.text+0xc): undefined reference to `_sbrk'"

Upvotes: 1

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