blackBox.cpp

00001 // BlackBox that saves the data when a pin interrupt is given
00002 // VEHICLE CRASH BLACKBOX
00003 
00004 
00005 #include "mbed.h"
00006 #include "TextLCD.h"
00007 
00008 TextLCD lcd(p22, p16, p17, p18, p19, p20, TextLCD::LCD16x2); // rs, e, d4-d7
00009 Serial ftdi(USBTX, USBRX); //defines serial port
00010 DigitalIn crash(p21); //crash sensor input (high/low);
00011 LocalFileSystem local("local");      // define local file system
00012 
00013 BusOut myleds(LED1,LED2,LED3, LED4);  //
00014 
00015 AnalogIn adc1(p15);  //ADC, speed sensor
00016 float speed=0;
00017 
00018 int count=0;                         // button count 
00019 struct tm t;                         // declaring RTC. current time will be stored here
00020 
00021 
00022 
00023 int main() {
00024     lcd.printf("Welcome!\n");
00025     //setting RTC and initializing RTC
00026     t.tm_year = 2015;     // current year
00027     t.tm_mon = 7;         // current month
00028     t.tm_mday = 7;        // current day
00029     t.tm_hour = 15;       // current hour
00030     t.tm_min = 16;        // current minute
00031     t.tm_sec = 0;         // current second   
00032     t.tm_year = t.tm_year - 1900;   // adjust for tm structure required values
00033     t.tm_mon = t.tm_mon - 1;
00034     set_time(mktime(&t));           // set the time
00035     
00036     FILE* Logfile = fopen ("/local/log.txt","w");
00037     fclose(Logfile);
00038     
00039     
00040         
00041     while(1) 
00042     {
00043         time_t seconds = time(NULL);
00044         if(crash.read()==0)          // if the button is pressed (If crash happened)
00045         {   
00046             while(crash.read()==0);  // wait until release
00047             wait_ms(20);             // button debounce time to avoid registering multiple inputs
00048             count++;                 // count up
00049             
00050             speed=adc1*120;
00051             
00052             ftdi.printf("Time: %s \rcount: %d \r\nSpeed: %f \r\n",ctime(&seconds),count, speed);         // send data to terminal
00053             ftdi.printf("-------------------------- \r\n");
00054             myleds=count; //display count on LED
00055             lcd.cls();
00056             lcd.printf("Speed: %0.1f \n",speed); //display speed on LCD
00057             
00058             
00059             FILE* Logfile = fopen ("/local/log.txt","a");                   // open file for appending  
00060             
00061             fprintf(Logfile, "Time: %s \rcount: %d \r\nSpeed: %f \r\n",ctime(&seconds),count, speed);    // save data to log.txt file
00062             fprintf(Logfile, "-------------------------- \r\n");
00063             fclose(Logfile);  
00064             }
00065             else
00066             {
00067                 myleds=0;
00068                 wait(1);
00069                 myleds=10;
00070                 wait(1);
00071                 }
00072                 
00073          }  
00074     
00075 }