[Video] ESP32 - DS1307 real time clock

[gregstewart90]

Got it working! Thanks Kolban for your help. My problem was with localtime(). Before using it, you have to call time().

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time_t now_after;
time ( &now_after );
char buff_after[100];
strftime (buff_after, 100, "%Y-%m-%dT%H:%M:%S.000", localtime (&now_after));

I do have one problem. Sometimes the reads are okay and other times I get an error on i2c_master_cmd_begin(). The error is ESP_ERR_TIMEOUT. It will work for a long time and then on a reboot wont work. Eventually it starts working again after several reboots. Kolban I am using your code for the DS1307. I found this https://github.com/espressif/esp-idf/issues/422, but the solution didn't help.

Thoughts?

[tbnobody]

I am having exactly the same problem. I am using a DS3231 (which is nearly compatible with the DS1307) but I cannot read anything using the ESP-IDF. If I use the Arduino environment (as a component in an IDF project) everything works fine.
The arduino code which I am using is from this site: http://tronixstuff.com/2014/12/01/tutor ... h-arduino/

The IDF code which I am using is from here: https://github.com/nkolban/esp32-snippe ... c/ds1307.c
I am able to write the time but reading just gives me a timeout error:

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D (1108) ds3231: >> ds1307
D (1111) ds3231: >> writeValue: 1502670328
D (1115) ds3231:  - Mon Aug 14 00:25:28 2017

E (2120) ds3231: i2c_master_cmd_begin: 263
D (2120) ds3231: time: 14
ESP_ERROR_CHECK failed: esp_err_t 0x107 at 0x400e3aec

[kolban]

I've always needed a logic analyzer (about $5-$10 on ebay) to debug I2C or SPI issues. Looking at the logic train on the wire is (for me) the only way to debug these kinds of issues.

[musabaybek]

The code that is provided here https://github.com/nkolban/esp32-snippe ... c/ds1307.c does not have make file, however I tried to create one and also component.mk files. But I face some errors like; "fatal error: errorhandle_func.h: No such file or directory"
I'm new to esp32 and idf based coding... Can you please help?

[cndgeek]

So much confusion in all the above!!!

This should help everyone sort stuff out:

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1. /* Constructor for the RTC on the logging shield. */
2. DFRobot_DS1307 DS1307;
3. char daynames[]="SUN\0MON\0TUE\0WED\0THU\0FRI\0SAT\0";
4.  
5. // Set the ESP32 time from the RTC.
6. bool StartRTC() { // See http://www.rinkydinkelectronics.com/resource/DS1307/DS1307.pdf
7.   if( !(DS1307.begin()) ){
8.     Serial.println(F("Communication with DS1307 RTC device failed"));
9.     return 1;
10.   }
11.   struct dsTimeStruct {
12.     uint16_t tm_sec;         /* seconds,  range 0 to 59          */
13.     uint16_t tm_min;         /* minutes, range 0 to 59           */
14.     uint16_t tm_hour;        /* hours, range 0 to 23             */
15.     uint16_t tm_wday;        /* day of the week, range 0 to 6    */              
16.     uint16_t tm_mday;        /* day of the month, range 1 to 31  */
17.     uint16_t tm_mon;         /* month, range 1 to 12 (not 0 to 11!) */
18.     uint16_t tm_year;        /* The number of years since 1900   */
19.     uint16_t tm_yday;        /* day in the year, range 0 to 365  */
20.     uint16_t tm_isdst;       /* daylight saving time             */
21.   } dstm ={0};
22.  
23.   DS1307.getTime((uint16_t *)&dstm); //dstm.tm_mon--; // The month on the DS1307 is 1-12.
24.  
25.   Serial.printf("DS1307 time: %s %4d/%02d/%02d %02d:%02d:%02d UTC\r\n", // DS1307 time: SUN 2022/07/17 13:06:10 UTC
26.   &daynames[dstm.tm_wday*4], //Weekday  &daynames[(getTimeBuff[3])*4], //Weekday  [3]
27.             dstm.tm_year, // Year [6]
28.             dstm.tm_mon,  // Month [5]
29.             dstm.tm_mday, // Day [4]
30.             dstm.tm_hour, // Hours  dstm.dsRaw[2]
31.             dstm.tm_min,  // Mins   dstm.dsRaw[1]
32.             dstm.tm_sec   // seconds dstm.dsRaw[0]
33.             );
34.  
35.  
36.   time_t seconds;
37.   time(&seconds); // Put the time into seconds
38.   struct tm *esptm;
39.   esptm=gmtime(&seconds);
40.   Serial.printf("ESP32 internal time: %s",asctime(esptm)); // ESP32 internal time: Thu Jan  1 00:00:00 1970
41.  
42.  
43.   //DS1307 format is not same as linux ( they put the tm_wday in the middle, and don't have yday and isdst).
44.   struct tm newdstm;  newdstm.tm_sec =dstm.tm_sec; newdstm.tm_min =dstm.tm_min; newdstm.tm_hour=dstm.tm_hour;
45.   newdstm.tm_wday=dstm.tm_wday; newdstm.tm_mday=dstm.tm_mday; newdstm.tm_mon =dstm.tm_mon-1; newdstm.tm_year=dstm.tm_year-1900;
46.   // Serial.printf("newdstm time: %s",asctime(&newdstm)); // newdstm time: Mon Jul 17 13:09:32 2022
47.   struct timeval dstv = { .tv_sec = mktime(&newdstm), .tv_usec = 0}; // &dstm.tm_ds
48.   settimeofday(&dstv, NULL);  
49.  
50.   time(&seconds); // Put the updated-above time into seconds
51.   esptm=gmtime(&seconds); // Convert epoc-based to D/M/Y...
52.   Serial.printf("new ESP32 internal time: %s",asctime(esptm)); // new ESP32 internal time: Sun Jul 17 13:14:29 2022
53.  
54.   return 0;
55. } // StartRTC

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