Diff: main.cpp

Revision:

0:a5ea226b5b26

Child:

2:e51a43447d68

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jul 08 11:26:38 2015 +0000
@@ -0,0 +1,92 @@
+/*  Datalogging with Real Time Clock on LPC1768 
+*
+*    @author: Baser Kandehir 
+*    @date: July 8, 2015
+*    @license: Use this code however you'd like
+*   
+*    @description of the program: 
+    
+*       This program can log data that is read from RTC(real time clock) which is embedded inside LPC768.     
+*   It saves the data to the LPC1768’s memory as “log.txt”. For this example program, the data is how many times the button is 
+*   pressed and when it is pressed in terms of real time. It can also display the button count as 4-bit binary number using 4 leds 
+*   on the LPC1768. There are two different time settings on the code. One can set the time from the terminal or manually by 
+*   uncommenting the corresponding portion of code. Once the time is set, if there is a battery connected to real-time clock, 
+*   RTC will continue to keep track of current time. In order not to reset the real-time to its initial value every time microcontroller 
+*   is reset, it is neccessary to set the time once and delete the portion of code which sets the time and keep the rest.
+*   
+*    @connections:
+*-------------------------------------------------------------- 
+*    LPC1768 ________________Peripherals
+*    Pin 13 --------> (TX) RX pin of the FTDI or Bluetooth etc.
+*    Pin 14 --------> (RX) TX pin of the FTDI or Bluetooth etc.
+*    Pin 20 -------->  Pull-up connected button
+*    GND ----------->  GND of any peripheral
+*    VOUT (3.3 V) -->  Pull-up resistor
+*---------------------------------------------------------------
+*
+*/
+
+#include "mbed.h"
+#include "ledCounter.h"
+
+Serial ftdi(p13, p14);               // setup terminal link
+LocalFileSystem local("local");      // define local file system
+DigitalIn button(p20);               // pull-up button is connected to p20
+     
+int count=0;                         // button count 
+struct tm t;                         // current time will be stored here
+
+int main()
+{   
+   /* UNCOMMENT BELOW if you want to set the time from the terminal. */
+/*
+    ftdi.printf("Enter current date and time:\r\n");
+    ftdi.printf("YYYY MM DD HH MM SS[enter]\r\n\r\n");    
+    ftdi.scanf("%d %d %d %d %d %d", &t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec);
+    ftdi.printf("-------------------------- \r\n");
+    
+    t.tm_year = t.tm_year - 1900;   // adjust for tm structure required values
+    t.tm_mon = t.tm_mon - 1;
+    
+    set_time(mktime(&t));           // set the time
+*/  
+
+    /* UNCOMMENT BELOW if you want to set time manually */
+/*       
+    t.tm_year = 2015;     // current year
+    t.tm_mon = 7;         // current month
+    t.tm_mday = 7;        // current day
+    t.tm_hour = 15;       // current hour
+    t.tm_min = 16;        // current minute
+    t.tm_sec = 0;         // current second
+    
+    t.tm_year = t.tm_year - 1900;   // adjust for tm structure required values
+    t.tm_mon = t.tm_mon - 1;
+    
+    set_time(mktime(&t));           // set the time
+*/
+      
+    /* Once the time is set, if there is a battery (3V) connected to VB pin and GND, RTC will remember the exact time. */
+    
+    while(1) 
+    {  
+        time_t seconds = time(NULL);
+        
+        if(button.read()==0)          // if the button is pressed
+        {   
+            while(button.read()==0);  // wait until release
+            wait_ms(20);              // button debounce
+            count++;                  // count up
+            
+            FILE* Logfile = fopen ("/local/log.txt","a");                                  // open file for appending  
+            
+            ftdi.printf("Time: %s \rButton count: %d \r\n",ctime(&seconds),count);         // send data to terminal
+            ftdi.printf("-------------------------- \r\n");
+            
+            fprintf(Logfile, "Time: %s \rButton count: %d \r\n",ctime(&seconds),count);    // save data to log.txt file
+            fprintf(Logfile, "-------------------------- \r\n");
+            fclose(Logfile);  
+        }   
+        ledCounter(count);         // display the count as binary
+    }
+}