RTC example not working on GIGA

Hardware GIGA R1
1

Hi! I'm trying to get the real time clock to work on my Giga. I have only found one example (original Arduino example):

#include "mbed.h"
#include <mbed_mktime.h>

constexpr unsigned long printInterval { 1000 };
unsigned long printNow {};

void setup() {
  Serial.begin(9600);
  RTCset();
}

void loop() {
      if (millis() > printNow) {
        Serial.print("System Clock:          ");
        Serial.println(getLocaltime());
        printNow = millis() + printInterval;
    }
}

void RTCset()  // Set cpu RTC
{    
  tm t;
            t.tm_sec = (0);       // 0-59
            t.tm_min = (52);        // 0-59
            t.tm_hour = (14);         // 0-23
            t.tm_mday = (18);   // 1-31
            t.tm_mon = (11);       // 0-11  "0" = Jan, -1 
            t.tm_year = ((22)+100);   // year since 1900,  current year + 100 + 1900 = correct year
            set_time(mktime(&t));       // set RTC clock                                 
}

String getLocaltime()
{
    char buffer[32];
    tm t;
    _rtc_localtime(time(NULL), &t, RTC_4_YEAR_LEAP_YEAR_SUPPORT);
    strftime(buffer, 32, "%Y-%m-%d %k:%M:%S", &t);
    return String(buffer);
}

and this leads to a crashing of the Mbed OS - notice that nothing is connected, I just wanted to try it before connecting a battery and other stuff... Double tapping it and loading a different script works fine... Can anyone provide some help?

2

Hi @henatu.

Does it crash immediately? I just tried running that program on my GIGA R1 WiFi board and it worked as expected for me; no crash.

Did you have "Main Core" selected from the Tools > Target core menu in Arduino IDE when you uploaded the sketch to your GIGA R1 WiFi board

1 Like
3

Thank you for the response. I tried a different GIGA and there it is working. So I guess that it was a faulty board.
Regarding your questions: Yes it is crashing immediately and the sketch is uploaded to the main core.

4

Thank you for taking the time to post an update! Unfortunate about the faulty board, but it is great progress to determine that the problem is specific to a certain board, rather than being something general caused by the sketch code.

Regards, Per