saving esp samples

esptests/esp-ds1307-test/main/main.cpp

@@ -0,0 +1,167 @@
+/* DS1307 Test
+
+*/
+
+// c libs
+#include <stdio.h>
+#include <time.h>
+#include <stdint.h>
+
+// esp32 libs
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "driver/gpio.h"
+#include "sdkconfig.h"
+#include "Arduino.h"
+
+// hw interface libs
+#include <TimeLib.h>
+#include <Wire.h>
+#include <DS1307RTC.h>
+
+// C++ libs
+#include <iostream>
+#include <sstream>
+#include <string>
+
+using namespace std;
+
+#if CONFIG_FREERTOS_UNICORE
+#define ARDUINO_RUNNING_CORE 0
+#else
+#define ARDUINO_RUNNING_CORE 1
+#endif
+
+bool dst(time_t t) {
+  /*
+   * calculate daylight savings time.
+   * returns true if given time_t is within sommertime.
+   *
+   * via: http://www.mikrocontroller.net/attachment/8391/TIME.C
+   */
+  int monat     = month(t);
+  int tag       = day(t);
+  int wochentag = weekday(t);
+  int stunde    = hour(t);
+  
+  if( monat < 3 || monat > 10 ) {
+    return false;
+  }
+  
+  if( tag - wochentag >= 25 && (wochentag || stunde >= 2) ) {
+    if( monat == 10 ) {
+       return false;
+     }
+  }
+  else {
+    if( monat == 3 ) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+time_t gettimeofday() {
+  /* return current time with dst() applied */
+  time_t t = now();
+  if(dst(t)) {
+    return t + 3600; 
+  }
+  else {
+    return t;
+  }
+}
+
+void printDigits(int digits){
+  // utility function for digital clock display: prints preceding colon and leading 0
+  Serial.print(":");
+  if(digits < 10)
+    Serial.print('0');
+  Serial.print(digits);
+}
+
+void digitalClockDisplay(){
+  // digital clock display of the time
+  Serial.print(hour());
+  printDigits(minute());
+  printDigits(second());
+  Serial.print(" ");
+  Serial.print(day());
+  Serial.print(" ");
+  Serial.print(month());
+  Serial.print(" ");
+  Serial.print(year()); 
+  Serial.println(); 
+}
+
+time_t time_when_compiled() {
+  tm t;
+  string str_month;
+  int day, year, month, hour, min, sec;
+    
+  string datestr = __DATE__;
+  string timestr = __TIME__;
+
+  istringstream iss_date( datestr );
+  iss_date >> str_month >> day >> year;
+
+  if     ( str_month == "Jan" ) month = 1;
+  else if( str_month == "Feb" ) month = 2;
+  else if( str_month == "Mar" ) month = 3;
+  else if( str_month == "Apr" ) month = 4;
+  else if( str_month == "May" ) month = 5;
+  else if( str_month == "Jun" ) month = 6;
+  else if( str_month == "Jul" ) month = 7;
+  else if( str_month == "Aug" ) month = 8;
+  else if( str_month == "Sep" ) month = 9;
+  else if( str_month == "Oct" ) month = 10;
+  else if( str_month == "Nov" ) month = 11;
+  else if( str_month == "Dec" ) month = 12;
+  else exit(-1);
+
+  for( string::size_type pos = timestr.find( ':' ); pos != string::npos; pos = timestr.find( ':', pos ) )
+    timestr[ pos ] = ' ';
+  istringstream iss_time( timestr );
+  iss_time >> hour >> min >> sec;
+
+  t.tm_mon = month-1;
+  t.tm_mday = day;
+  t.tm_year = year - 1900;
+  t.tm_hour = hour - 1;
+  t.tm_min = min;
+  t.tm_sec = sec;
+  return mktime(&t);
+}
+
+void setClock(time_t t) {
+  if (t != 0) {
+    RTC.set(t);
+    setTime(t);          
+  }
+}
+
+void setup()  {
+  Serial.begin(9600);
+  while (!Serial) ; // wait until Arduino Serial Monitor opens
+  setSyncProvider(RTC.get);   // the function to get the time from the RTC
+  if(timeStatus()!= timeSet) 
+     Serial.println("Unable to sync with the RTC");
+  else
+     Serial.println("RTC has set the system time");
+
+  setClock(time_when_compiled());
+}
+
+void loop()
+{
+  if (timeStatus() == timeSet) {
+    digitalClockDisplay();
+  } else {
+    Serial.println("The time has not been set.  Please run the Time");
+    Serial.println("TimeRTCSet example, or DS1307RTC SetTime example.");
+    Serial.println();
+    delay(4000);
+  }
+  delay(1000);
+}