Diff: main.cpp

Revision:

1:811c5881ca5c

Parent:

0:a338d4ab50c9

--- a/main.cpp	Sat Jul 28 12:31:40 2018 +0000
+++ b/main.cpp	Sat Jul 28 17:55:03 2018 +0000
@@ -1,12 +1,16 @@
-/* 
+/*
   Project: my_SetRTC, File: main.cpp.
 
-  Based on mktime example: weekday calculator from 
+  Based on mktime example: weekday calculator from
   http://www.cplusplus.com/reference/ctime/mktime. Modified to set Mbed/Nucleo
   RTC.
-  
+
+  Note the on the Nucleo F446RE the Nucleo the RTC survives (is not reset by) 
+  device reset an even downloading new code! It is also claimed that it 
+  continues to keep time even when the processor in in sleep mode.
+
   Modified by C. S. Tritt
-  Last modified: 7/28/18 (v. 1.0)
+  Last modified: 7/28/18 (v. 1.1)
 */
 #include <mbed.h> // wait, etc.
 //#include <mbed_mktime.h> // For _rtc_mktime. Didn't work.
@@ -15,57 +19,80 @@
 
 int main ()
 {
-  // Create variables.
-  time_t rawtime;
-  struct tm* timeinfo;
-  int year, month ,day, hours, minutes, secs;
-  const char* weekday[] = { "Sunday", "Monday",
-                             "Tuesday", "Wednesday",
-                             "Thursday", "Friday", "Saturday"};
-
-  // Prompt user for date and time.
-  printf("\nTurn echo on to see your input.\n");
-  printf("\nEnter year (YYYY): "); scanf ("%d",&year);
-  printf("\nEnter month (1 to 12): "); scanf ("%d",&month);
-  printf("\nEnter day (D or DD): "); scanf ("%d",&day);
-  printf("\nEnter hours (0 to 23):"); scanf ("%d",&hours);
-  printf("\nEnter hours (0 to 59):"); scanf ("%d",&minutes);
-  printf("\nEnter hours (0 to 59):"); scanf ("%d",&secs);
+    // Announce project and program information.
+    printf("\nProject: my_SetRTC, File: main.cpp (v. 1.1)\n");
+    
+    // Create variables.
+    time_t rawtime;
+    struct tm* timeinfo;
+    int year, month ,day, hours, minutes, secs;
+    const char* weekday[] = { "Sunday", "Monday",
+                              "Tuesday", "Wednesday",
+                              "Thursday", "Friday", "Saturday"
+                            };
 
-  // Get current RTC time structure.
-  time(&rawtime);
-  timeinfo = localtime(&rawtime); // Modify to local time.
-  
-  // Modify it using user input.
-  timeinfo->tm_year = year - 1900; // tm_year are from 1900.
-  timeinfo->tm_mon = month - 1; // tm_month are 0 to 11.
-  timeinfo->tm_mday = day;
-  timeinfo->tm_hour = hours;
-  timeinfo->tm_min = minutes;
-  timeinfo->tm_sec = secs;
-
-  // Call mktime: timeinfo->tm_wday will be set.
-  mktime(timeinfo);
+    // Get current RTC time structure.
+    time(&rawtime);
+    timeinfo = localtime(&rawtime); // Modify to local time.
+    printf("Current RTC time: %s", ctime(&rawtime)); // Display current time.
+    
+    // See if user wants to reset the RTC.
+    printf("\nTurn local echo on to see your input.\n");
+    printf("Do you want to set new time (y or n): ");
+    char userIn;
+    scanf("%c", &userIn);
+    if (userIn == 'y') {
+        // Prompt user for date and time.
+        printf("\nEnter year (YYYY): ");
+        scanf ("%d",&year);
+        printf("\n%d read.", year);
+        printf("\nEnter month (1 to 12): ");
+        scanf ("%d",&month);
+        printf("\n%d read.", month);
+        printf("\nEnter day (D or DD): ");
+        scanf ("%d",&day);
+        printf("\n%d read.", day);
+        printf("\nEnter hours (0 to 23):");
+        scanf ("%d",&hours);
+        printf("\n%d read.", hours);
+        printf("\nEnter minutes (0 to 59):");
+        scanf ("%d",&minutes);
+        printf("\n%d read.", minutes);
+        printf("\nEnter seconds (0 to 59):");
+        scanf ("%d",&secs);
+        printf("\n%d read.", secs);
+    
+        // Modify it using user input.
+        timeinfo->tm_year = year - 1900; // tm_year are from 1900.
+        timeinfo->tm_mon = month - 1; // tm_month are 0 to 11.
+        timeinfo->tm_mday = day;
+        timeinfo->tm_hour = hours;
+        timeinfo->tm_min = minutes;
+        timeinfo->tm_sec = secs;
+    
+        // Call mktime: timeinfo->tm_wday will be set.
+        mktime(timeinfo);
+    
+        // tm_wday are 0 to 6. Use to check entered values.
+        printf("\nThis must be a %s.\n", weekday[timeinfo->tm_wday]);
+    
+        // Set the mbed RTC to the current time. Not interupt safe. Should be
+        // _rtc_mktime, but that didn't work.
+        set_time(mktime(timeinfo));
+    }
 
-  // tm_wday are 0 to 6. Use to check entered values.
-  printf("\nThis must be a %s.\n", weekday[timeinfo->tm_wday]);
-  
-  // Set the mbed RTC to the current time. Not interupt safe. Should be 
-  // _rtc_mktime, but that didn't work.
-  set_time(mktime(timeinfo));
-  
-  while (true) { // Loop forever more.
-    // Get current time.
-    time_t nowSecs = time(NULL);
-    
-    // Display it in various ways.   
-    printf("\nTime as seconds since January 1, 1970 = %d\n", nowSecs);
-    printf("Time as a basic string = %s", ctime(&nowSecs)); // ctime incl. \n.
-    char buffer[32];
-    strftime(buffer, 32, "%I:%M %p\n", localtime(&nowSecs));
-    printf("As a custom string = %s\n", buffer);
-    
-    // Sleep for 1 second.
-    wait(1.0);
-  }
+    while (true) { // Loop forever more.
+        // Get current time.
+        time_t nowSecs = time(NULL);
+
+        // Display it in various ways.
+        printf("\nSeconds since UNIX Epoch: %d\n", nowSecs);
+        printf("Time as a ctime string: %s", ctime(&nowSecs)); // String has \n.
+        char buffer[32];
+        strftime(buffer, 32, "%I:%M %p\n", localtime(&nowSecs));
+        printf("Time as a strftime custom string: %s\n", buffer);
+
+        // Sleep for 1 second.
+        wait(1.0);
+    }
 }
\ No newline at end of file