LCD.hpp

00001 #ifndef _LCD_
00002 #define _LCD_
00003 #include "mbed.h"
00004 #include "messageStruct.hpp"
00005 #include "sample_hardware.hpp"
00006 #include "Network.hpp"
00007 #include <stdio.h>
00008 #include <string>
00009 
00010 
00011 class LCD_Data
00012     {
00013      friend class Network;
00014      
00015      private:  //private variables can only be changed via functions in this class
00016          float temp;       //current temperature of sensor, updated every 15 seconds
00017          float pressure;  //current pressure of sensor, updated every 15 seconds
00018          float fLDR;      //current light level from LDR, updated every 15 seconds
00019          
00020          int flip; //integer used to flip the bottom line of LCD
00021          
00022          string day; //string containing the current day when pulled from NTP server
00023          string month; //string containing the current month when pulled from NTP server
00024          string date; //string containing the current date when pulled from NTP server
00025          string time; //string containing the current time when pulled from NTP server
00026          string year; //string containing the current year when pulled from NTP server
00027 
00028 
00029      private:
00030          struct tm Time_Date; //decale instance Time_Date of structure tm which is defined by mbed / C
00031         
00032          
00033          void update_temp(double t) //used to update the current temperature value with an input
00034             {
00035                 temp = t; //sets private variable temp
00036             } 
00037         void update_pressure(double p) //used to update the current pressure value with an input
00038             {
00039                 pressure = p; 
00040             } 
00041         void update_LDR(double L) //used to update the LDR value with an input
00042             {
00043                 fLDR = L;   
00044             }
00045     
00046     
00047     
00048     public:
00049     
00050     EventQueue LCD_Queue;  //create an event queue for main to run
00051     time_t timestamp; //current time in format of unix time, can be converted to DAY_OF_WEEK MONTH DAY HOUR:MINUTE:SECOND YEAR using ctime(&timestamp);
00052     
00053     
00054     
00055     LCD_Data(){ //constructor, initializes the FLIP variable for use in toggling the bottom line of the LCD
00056         flip = 1; //initalize what state the bottom line starts on
00057         temp = 0; //set temperature to start at 0
00058         pressure = 0; //set pressure to start at 0
00059         fLDR = 0; //set LDR value to start at 0
00060 
00061 
00062     }   
00063     
00064     
00065     
00066     void update_sensor_info(sample_message msg) //updates all current sensor information. recieves sensor info in structure type sample_message and takes it apart
00067     {
00068          update_temp(msg.temp);    // takes temperature from sample_message and feeds to update temp function
00069          update_pressure(msg.pressure); //takes pressure from sample_message and feeds to update pressure function
00070          update_LDR(msg.ldr); //takes the LDR value from sample_message and feeds to update LDR function
00071     }
00072     
00073 
00074     
00075     
00076     void display_LCD() //updates the current LCD display with the new sensor information, and flips bottom line of LCD
00077         {
00078          lcd.cls(); //clear current LCD display
00079          
00080          lcd.printf("%4.2fC", temp); //print temperature to the top line of LCD, 2dp celcius
00081          
00082          
00083          switch(flip){
00084          case 1: 
00085             lcd.printf("\n%4.2f mbar", pressure); //print pressure to bottom line of LCD, 2dp mbar
00086             flip = 2; //swaps to case 2 next time function is run so LDR is printed instead
00087             break;  
00088          case 2:
00089              lcd.printf("\n%4.2f Lux", fLDR); //print LDR value to bottom line of LCD, 2dp
00090              flip = 1; //swaps to case 1 next time function is run so pressure is printed instead
00091             break;  
00092          case 3: //only ever used when the interupt button is pressed to update time
00093              lcd.printf("\nTime updated"); //informs the user the current time has been set by printing onto bottom line
00094              printf("Current time is %s\r\n", ctime(&timestamp)); //prints current time and date in human readable time to terminal
00095              flip = 1; //swaps back to case 1 next time function is run
00096             break;         
00097         default: 
00098             printf("Error in LCD flip function"); //only reached if the case is set incorrectly
00099             break;
00100          }
00101        } 
00102        
00103        
00104        
00105        void update_time_date (){ //used to update time and date, called only when button interrupt is pressed
00106            
00107        timestamp = ntp.get_timestamp(); //reads the current time from a local NTP server in UNIX format
00108        
00109        string current_time =  ctime(&timestamp); //converts time to human readable format string
00110         
00111        printf("%s", current_time); //prints current time and date onto terminal
00112 
00113      
00114      day.assign(current_time, 0, 3); //extract only day from current_time string
00115      month.assign(current_time, 4, 3); //extract only month from current_time string
00116      date.assign(current_time, 9, 1); //extract only date from current_time string
00117      time.assign(current_time, 11, 8); //extract only time from current_time string
00118      year.assign(current_time, 20, 4); //extract only year from current_time string
00119      
00120      
00121      //printf("current day is: %s\n", day);
00122        // printf("current year is: %s\n", year);
00123       // printf("current time is: %s\n", time);
00124        // printf("current date is: %s\n", date);
00125      // printf("current month is: %s\n", month);
00126      
00127  
00128           
00129        m_oNet.Network_Queue.call(&m_oNet, &Network::update_Time, current_time); //sends the whole time and date string to networking to be displayed
00130        
00131        time_and_date Timemsg; // Define instance of message structure, used by serial communications
00132         Timemsg.day = day; 
00133         Timemsg.month = month;
00134         Timemsg.date = date;
00135         Timemsg.time = time;
00136         Timemsg.year = year;
00137         Timemsg.current_time = current_time;
00138         
00139        flip = 3; //will tell the user that the time has been updated on next FLIP instance with the LCD
00140        
00141      //  return Timemsg; //swap this for a function that sends the structure to ollie?
00142         
00143        }
00144        
00145        
00146     };  //end of LCD class
00147     
00148     
00149     
00150 // Define the member object for the LCD
00151 LCD_Data m_oDisplay;
00152 #endif