Baser Kandehir / Mbed 2 deprecated datalogging_RTC Featured

This program can log data that is read from RTC(real time clock) which is embedded inside LPC1768. It saves the data to the LPC1768’s memory as “log.txt”.

Dependencies:   ledCounter mbed

main.cpp@2:e51a43447d68, 2015-07-08 (annotated)

Committer:
BaserK
Date:
Wed Jul 08 17:13:03 2015 +0000
Revision:
2:e51a43447d68
Parent:
0:a5ea226b5b26
Child:
3:192d65ce0c19
Comment updates, code still same

Who changed what in which revision?

UserRevisionLine numberNew contents of line
BaserK 0:a5ea226b5b26 1 /* Datalogging with Real Time Clock on LPC1768
BaserK 0:a5ea226b5b26 2 *
BaserK 0:a5ea226b5b26 3 * @author: Baser Kandehir
BaserK 0:a5ea226b5b26 4 * @date: July 8, 2015
BaserK 0:a5ea226b5b26 5 * @license: Use this code however you'd like
BaserK 0:a5ea226b5b26 6 *
BaserK 0:a5ea226b5b26 7 * @description of the program:
BaserK 2:e51a43447d68 8 *
BaserK 2:e51a43447d68 9 * This program can log data that is read from RTC(real time clock) which
BaserK 2:e51a43447d68 10 * is embedded inside LPC1768. It saves the data to the LPC1768’s memory as
BaserK 2:e51a43447d68 11 * “log.txt”. For this example program, the data is how many times the button
BaserK 2:e51a43447d68 12 * is pressed and when it is pressed in terms of real time. It can also
BaserK 2:e51a43447d68 13 * display the button count as 4-bit binary number using 4 leds on the LPC1768.
BaserK 2:e51a43447d68 14 * There are two different time settings on the code. One can set the time from
BaserK 2:e51a43447d68 15 * the terminal or manually by uncommenting the corresponding portion of code.
BaserK 2:e51a43447d68 16 * Once the time is set, if there is a battery connected to real-time clock,
BaserK 2:e51a43447d68 17 * RTC will continue to keep track of current time. In order not to reset the
BaserK 2:e51a43447d68 18 * real-time to its initial value every time microcontroller is reset, it is
BaserK 2:e51a43447d68 19 * neccessary to set the time once and delete the portion of code which sets
BaserK 2:e51a43447d68 20 * the time and keep the rest.
BaserK 0:a5ea226b5b26 21 *
BaserK 0:a5ea226b5b26 22 * @connections:
BaserK 0:a5ea226b5b26 23 *--------------------------------------------------------------
BaserK 2:e51a43447d68 24 * |LPC1768| |Peripherals|
BaserK 0:a5ea226b5b26 25 * Pin 13 --------> (TX) RX pin of the FTDI or Bluetooth etc.
BaserK 0:a5ea226b5b26 26 * Pin 14 --------> (RX) TX pin of the FTDI or Bluetooth etc.
BaserK 0:a5ea226b5b26 27 * Pin 20 --------> Pull-up connected button
BaserK 0:a5ea226b5b26 28 * GND -----------> GND of any peripheral
BaserK 0:a5ea226b5b26 29 * VOUT (3.3 V) --> Pull-up resistor
BaserK 0:a5ea226b5b26 30 *---------------------------------------------------------------
BaserK 0:a5ea226b5b26 31 *
BaserK 0:a5ea226b5b26 32 */
BaserK 0:a5ea226b5b26 33
BaserK 0:a5ea226b5b26 34 #include "mbed.h"
BaserK 0:a5ea226b5b26 35 #include "ledCounter.h"
BaserK 0:a5ea226b5b26 36
BaserK 0:a5ea226b5b26 37 Serial ftdi(p13, p14); // setup terminal link
BaserK 0:a5ea226b5b26 38 LocalFileSystem local("local"); // define local file system
BaserK 0:a5ea226b5b26 39 DigitalIn button(p20); // pull-up button is connected to p20
BaserK 0:a5ea226b5b26 40
BaserK 0:a5ea226b5b26 41 int count=0; // button count
BaserK 0:a5ea226b5b26 42 struct tm t; // current time will be stored here
BaserK 0:a5ea226b5b26 43
BaserK 0:a5ea226b5b26 44 int main()
BaserK 0:a5ea226b5b26 45 {
BaserK 0:a5ea226b5b26 46 /* UNCOMMENT BELOW if you want to set the time from the terminal. */
BaserK 0:a5ea226b5b26 47 /*
BaserK 0:a5ea226b5b26 48 ftdi.printf("Enter current date and time:\r\n");
BaserK 0:a5ea226b5b26 49 ftdi.printf("YYYY MM DD HH MM SS[enter]\r\n\r\n");
BaserK 0:a5ea226b5b26 50 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);
BaserK 0:a5ea226b5b26 51 ftdi.printf("-------------------------- \r\n");
BaserK 0:a5ea226b5b26 52
BaserK 0:a5ea226b5b26 53 t.tm_year = t.tm_year - 1900; // adjust for tm structure required values
BaserK 0:a5ea226b5b26 54 t.tm_mon = t.tm_mon - 1;
BaserK 0:a5ea226b5b26 55
BaserK 0:a5ea226b5b26 56 set_time(mktime(&t)); // set the time
BaserK 0:a5ea226b5b26 57 */
BaserK 0:a5ea226b5b26 58
BaserK 0:a5ea226b5b26 59 /* UNCOMMENT BELOW if you want to set time manually */
BaserK 0:a5ea226b5b26 60 /*
BaserK 0:a5ea226b5b26 61 t.tm_year = 2015; // current year
BaserK 0:a5ea226b5b26 62 t.tm_mon = 7; // current month
BaserK 0:a5ea226b5b26 63 t.tm_mday = 7; // current day
BaserK 0:a5ea226b5b26 64 t.tm_hour = 15; // current hour
BaserK 0:a5ea226b5b26 65 t.tm_min = 16; // current minute
BaserK 0:a5ea226b5b26 66 t.tm_sec = 0; // current second
BaserK 0:a5ea226b5b26 67
BaserK 0:a5ea226b5b26 68 t.tm_year = t.tm_year - 1900; // adjust for tm structure required values
BaserK 0:a5ea226b5b26 69 t.tm_mon = t.tm_mon - 1;
BaserK 0:a5ea226b5b26 70
BaserK 0:a5ea226b5b26 71 set_time(mktime(&t)); // set the time
BaserK 0:a5ea226b5b26 72 */
BaserK 0:a5ea226b5b26 73
BaserK 0:a5ea226b5b26 74 /* Once the time is set, if there is a battery (3V) connected to VB pin and GND, RTC will remember the exact time. */
BaserK 0:a5ea226b5b26 75
BaserK 0:a5ea226b5b26 76 while(1)
BaserK 0:a5ea226b5b26 77 {
BaserK 0:a5ea226b5b26 78 time_t seconds = time(NULL);
BaserK 0:a5ea226b5b26 79
BaserK 0:a5ea226b5b26 80 if(button.read()==0) // if the button is pressed
BaserK 0:a5ea226b5b26 81 {
BaserK 0:a5ea226b5b26 82 while(button.read()==0); // wait until release
BaserK 0:a5ea226b5b26 83 wait_ms(20); // button debounce
BaserK 0:a5ea226b5b26 84 count++; // count up
BaserK 0:a5ea226b5b26 85
BaserK 0:a5ea226b5b26 86 FILE* Logfile = fopen ("/local/log.txt","a"); // open file for appending
BaserK 0:a5ea226b5b26 87
BaserK 0:a5ea226b5b26 88 ftdi.printf("Time: %s \rButton count: %d \r\n",ctime(&seconds),count); // send data to terminal
BaserK 0:a5ea226b5b26 89 ftdi.printf("-------------------------- \r\n");
BaserK 0:a5ea226b5b26 90
BaserK 0:a5ea226b5b26 91 fprintf(Logfile, "Time: %s \rButton count: %d \r\n",ctime(&seconds),count); // save data to log.txt file
BaserK 0:a5ea226b5b26 92 fprintf(Logfile, "-------------------------- \r\n");
BaserK 0:a5ea226b5b26 93 fclose(Logfile);
BaserK 0:a5ea226b5b26 94 }
BaserK 0:a5ea226b5b26 95 ledCounter(count); // display the count as binary
BaserK 0:a5ea226b5b26 96 }
BaserK 0:a5ea226b5b26 97 }