Diff: main.cpp

Revision:

0:a338d4ab50c9

Child:

1:811c5881ca5c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Jul 28 12:31:40 2018 +0000
@@ -0,0 +1,71 @@
+/* 
+  Project: my_SetRTC, File: main.cpp.
+
+  Based on mktime example: weekday calculator from 
+  http://www.cplusplus.com/reference/ctime/mktime. Modified to set Mbed/Nucleo
+  RTC.
+  
+  Modified by C. S. Tritt
+  Last modified: 7/28/18 (v. 1.0)
+*/
+#include <mbed.h> // wait, etc.
+//#include <mbed_mktime.h> // For _rtc_mktime. Didn't work.
+//#include <stdio.h> // printf, scanf - incl. in mbed.h.
+//#include <time.h> // time_t, struct tm, time, mktime in mbed.h.
+
+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);
+
+  // 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);
+
+  // 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);
+  }
+}
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