File content as of revision 20:2ce28a5032d5:

#ifndef _LCD_
#define _LCD_
#include "mbed.h"
#include "messageStruct.hpp"
#include "sample_hardware.hpp"
#include "Network.hpp"
#include <stdio.h>
#include <string.h>

Mail<time_and_date,5> Serial2LCD;           // Serial -> LCD Mailbox 5 Elements Wide Time&Date

class LCD_Data
    {
     friend class Network;
     
     private:  //private variables can only be changed via functions in this class
         float temp;       //current temperature of sensor, updated every 15 seconds
         float pressure;  //current pressure of sensor, updated every 15 seconds
         float fLDR;      //current light level from LDR, updated every 15 seconds
         int flip;
         string day;
         string month;
         string date;
         string time;
         string year;
         

     private:
         struct tm Time_Date; //decale instance Time_Date of structure tm which is defined by mbed / C
        
         
         void update_temp(double t) //use this function to update the current temperature value
            {
                temp = t;
            } 
        void update_pressure(double p) //use this function to update the current pressure value
            {
                pressure = p;    
            } 
        void update_LDR(double L)
            {
                fLDR = L;   
            }
    
    
    
    public:
    
    EventQueue LCD_Queue;  //create an event queue for main
    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);
    
 
        void getSerial2LCD()    // Queue Consumer
        {
            if (!Serial2LCD.empty())
            {
                osEvent evt = Serial2LCD.get(); 
        switch (evt.status) 
                {
                    case osEventMail:
                //Normal status
                                time_and_date *time_copy = (time_and_date*)evt.value.p; 
                                time = time_copy->current_time; // Update the internal clock
                                Serial2Net.free(time_copy); // Free up the space in the memory Pool
                    default:
                //All other errors (see cmsis_os.h for meaning of error code)
                //printf("Serial2Net->get() returned %02x status\n\r", evt.status);
                }               
            }
        }
   
    
    LCD_Data(){ //constructor, initializes the FLIP variable for use in toggling the bottom line of the LCD
        flip = 1;
        temp = 0;
        pressure = 0; 
        fLDR = 0;


    }   
    
    
    
    void update_sensor_info(sample_message msg) //updates all current sensor information, this is called by a ticker every 5 seconds to read from the mailbox
    {
         update_temp(msg.temp);    // Include message class passing of data
         update_pressure(msg.pressure);
         update_LDR(msg.ldr);
    }
    

    
    
    void display_LCD() //updates the current LCD display with the new sensor information
        {
         lcd.cls(); //clear current LCD display
         
         lcd.printf("%4.2fC", temp); //print temperature to the top line of LCD, 2dp celcius
         
         
         switch(flip){
         case 1: 
            lcd.printf("\n%4.2f mbar", pressure); //print pressure to bottom line of LCD, 2dp mbar
            flip = 2;
            break;  
         case 2:
             lcd.printf("\n%4.2f Lux", fLDR); //print pressure to bottom line of LCD, 2dp mbar
             flip = 1;   
            break;  
         case 3: //only ever called when the interupt button is pressed to update time
             lcd.printf("\nTime updated"); //informs the user the current time has been set
             printf("Current time is %s\r\n", ctime(&timestamp)); //prints current time and date in human readable time to terminal
             flip = 1;
            break;         
        default: 
            printf("Error in LCD flip function");
            break;
         }
       } 
       
       
       
       time_and_date update_time_date (){
           
       timestamp = ntp.get_timestamp(); //reads the current time from a local NTP server in UNIX format
        
       string current_time =  ctime(&timestamp); //converts time to human readable format string


     
     day.assign(current_time, 0, 3); //extract only day from current_time string
     month.assign(current_time, 4, 3); //extract only month from ""
     date.assign(current_time, 9, 1); //extract only date from ""
     time.assign(current_time, 11, 8); //extract only time from ""
     year.assign(current_time, 20, 4); //extract only year from ""
     
     
     //printf("current day is: %s\n", day);
     // printf("current year is: %s\n", year);
     // printf("current time is: %s\n", time);
     // printf("current date is: %s\n", date);
     // printf("current month is: %s\n", month);
     
 
          
       m_oNet.Network_Queue.call(&m_oNet, &Network::update_Time, current_time);
       
       time_and_date Timemsg; // Define instance of message structure
                Timemsg.day = day;
                Timemsg.month = month;
                Timemsg.date = date;
                Timemsg.time = time;
                Timemsg.year = year;
                Timemsg.current_time = current_time;
        
       flip = 3; //will tell the user that the time has been updated on next FLIP instance with the LCD
       
       return Timemsg; //swap this for a function that sends the structure to ollie?
        
       }
       
       
    };  //end of LCD class
    
// Define the member object for the LCD
LCD_Data m_oDisplay;
#endif