LAUNCHCC3235MOD: Setting Daylight Savings Time

As I stated, the device was setup by user in web interface and the correct local time displayed. There must be some way to do this. Current code looks like 

// Time
#include <time.h>
#include <unistd.h>
#include <ti/net/sntp/sntp.h>
#define TIME_BASEDIFF        ((((uint32_t)70 * 365 + 17) * 24 * 3600))
#define TIME_NTP_TO_LOCAL(t) ((t) - TIME_BASEDIFF)
#define NTP_SERVERS 1
#define NTP_SERVER_PORT 123
/*  Time to wait for reply from server (seconds) */
#define NTP_REPLY_WAIT_TIME 5
/* Must wait at least 15 sec to retry NTP server (RFC 4330) */
#define NTP_POLL_TIME 15
#define TIME_BASEDIFF        ((((uint32_t)70 * 365 + 17) * 24 * 3600))
#define TIME_NTP_TO_LOCAL(t) ((t) - TIME_BASEDIFF)
volatile int g_ibtime=0;
//
int startSNTP(void){
    uint32_t uimax = 0xffffffff;
    int iret=0;
    if (g_ibtime==1) return 1;
    int32_t  retVal;
    uint32_t seconds;
    uint32_t secondsFraction;
    SlNetSock_Timeval_t timeval;
    uint64_t ntpTimeStamp = 0;
    uint32_t uiunix_secs;
    struct timespec ts;
    //struct tm;
    struct timespec tp;
    char acdt[0x30];
    /* Set timeout value for NTP server reply */
    timeval.tv_sec = NTP_REPLY_WAIT_TIME;
    timeval.tv_usec = 0;
    do {
        /* Get the time use the built in NTP server list: */
        //retVal = SNTP_getTime((const char *)"192.168.1.85", 1, &timeval, &ntpTimeStamp);
        retVal = SNTP_getTime(0, 0, &timeval, &ntpTimeStamp);
        if (retVal != 0) {
            Display_printf(display, 0, 0,
                "startSNTP: couldn't get time (%d), will retry in %d secs ...",
                retVal, NTP_POLL_TIME);
            sleep(NTP_POLL_TIME);//
            Display_printf(display, 0, 0, "startSNTP: retrying ...");
        }
        Display_printf(display, 0, 0,"startSNTP: Got time.\n");
        seconds = (0xFFFFFFFF00000000 & ntpTimeStamp) >> 32;
        // The seconds fraction is stored in the lower 32 bits
        secondsFraction = ntpTimeStamp;
        Display_printf(display, 0, 0,"seconds=0x%08x\n",seconds);
        ts.tv_sec=TIME_NTP_TO_LOCAL(seconds);
        Display_printf(display, 0, 0,"unix seconds=0x%08x\n",ts.tv_sec);
        ts.tv_nsec=(int32_t)(((double)secondsFraction / (double)uimax) *( (double)0x3B9ACA00));
        Display_printf(display, 0, 0,"nanoseconds=0x%08x\n",ts.tv_nsec);
        int ix= strftime(&acdt[0], 0x30, "%D %T", &ts.tv_sec);
        Display_printf(display, 0, 0,"retVal=%d\n",retVal);
    } while (retVal < 0);
    if (clock_settime(CLOCK_REALTIME, &ts) != 0) {
        Display_printf(display, 0, 0, "startSNTP: Failed to set current time\n");
        iret=0;
    }
    else{
        iret=1;
        int isz=sizeof(tp);
        int ires=clock_gettime(CLOCK_REALTIME,&tp);

        strftime(&(acdt[0]), 0x30, "%D %T", gmtime(&tp.tv_sec));
        Display_printf(display, 0, 0, "Time=%s\n",&acdt[0] );
        strftime(&(acdt[0]), 0x30, "%D %T", localtime(&tp.tv_sec));
        Display_printf(display, 0, 0, "Local Time=%s\n",&acdt[0] );
    }
    g_ibtime=1;
    return iret;
}

Hi,

I never used time.h library with CC32xx. I would recommand to use clock_sync.h library as is common way with TI demo examples (e.g. local_time). There is function ClockSync_setTimeZone() for settings of timezone.

Jan

Thanks. I'm beginning to rethink this based on complexity and how useful it would be in a timestamp. UTC and xST is good enough for me now. My router does not support dhcp option 2 as far as I can tell.