File content as of revision 2:63ef0a1afcbe:

#include "mbed.h"
#include "N5110.h"
#include "BMP180.h"

//    VCC,SCE,RST,D/C,MOSI,SCLK,LED
N5110 lcd(p7,p8,p9,p10,p11,p13,p26);
// Can also power (VCC) directly from VOUT (3.3 V) -
// Can give better performance due to current limitation from GPIO pin

Ticker timer ; //create a ticker object to read the data from the sensor
Timeout timeOut ;
BMP180 bmp180(p28,p27);
Serial serial(USBTX,USBRX);
AnalogIn POT(p20);
InterruptIn graphButton(p16); //button to select graph
InterruptIn currentButton(p15); //button to select current

int timerFlag= 0;
int timeOutFlag = 0 ;
int graphFlag = 0 ;
int currentFlag = 0;
int temperature ;
float pressure;
void displayTemperature();
void displayPressure();
void recieveData();





void screen()
{
    lcd.printString("Weather Logger",0,2);
    lcd.printString("3000",32,3);
    lcd.printString("Alex Raper",15,5);
    lcd.refresh();
}

void menu()
{
    lcd.clear();
    if (POT>(1.0/2.0)) {
        lcd.printString("Temperature",2,2);
        lcd.printString(">",76,2);
        lcd.printString("Graph",0,5);
        lcd.printString("Current",42,5);
        if (graphFlag) {
            graphFlag = 0;

        }
        if (currentFlag ==1 ) { // if the current button is pressed
            currentFlag = 0;
            while(1) {
                if (timerFlag ==1) { // if the timer flag is set (Timer every 1.0 second)
                    timerFlag = 0;
                    displayTemperature();
                }
            } // while loop ends
        }
    } else {
        lcd.printString("Pressure",18,2);
        lcd.printString("<",2,2);
        lcd.printString("Graph",0,5);
        lcd.printString("Current",42,5);
        if (graphFlag) {
            graphFlag = 0;

        }
        if (currentFlag) { // if the current button is pressed
            currentFlag = 0;
            while(1) {
                if (timerFlag ==1) { // if the timer flag is set (Timer every 1.0 second)
                    timerFlag = 0;
                    displayPressure();
                }
                wait (0.1);
            } // while loop ends
        }
    }
}

void timerExpired()
{
    timerFlag = 1 ;
}

void timeOutStopped()
{

    timeOutFlag = 1;
}

void graphButtonPressed ()
{
    graphFlag = 1;
        serial.printf("graph button pressed ");
}

void currentButtonPressed ()
{
    currentFlag = 1;
            serial.printf("current button pressed ");
}
void recieveData()
{

    Measurement measurement;  // measurement structure declared in BMP180 class

    // read values (T in Celsius and P in mb) and print over serial port
    measurement = bmp180.readValues();
    serial.printf("T = %.2f C P = %.2f mb\n",measurement.temperature,measurement.pressure);

    temperature = measurement.temperature ;
    pressure = measurement.pressure ;

}


void displayTemperature()
{
    lcd.clear();
        recieveData();
    char buffer[14];  // each character is 6 pixels wide, screen is 84 pixels (84/6 = 14)
    // so can display a string of a maximum 14 characters in length
    // or create formatted strings - ensure they aren't more than 14 characters long
    int length = sprintf(buffer,"T = %2d C",temperature); // print formatted data to buffer
    // it is important the format specifier ensures the length will fit in the buffer
            serial.printf( " L %i",length);
    if (length <= 14)  // if string will fit on display
        lcd.printString(buffer,0,2);           // display on screen

}

void displayPressure()
{
        lcd.clear();
            recieveData();
    char buffer1[14];
    int length1 = sprintf(buffer1,"P = %.2fmb",pressure);
     serial.printf( " L1 %i",length1);
    if (length1 <= 14)
        lcd.printString(buffer1,0,2);

}



int main()
{
    // first need to initialise display
    lcd.init();
    // initiliase barometer
    bmp180.init();
    timer.attach (&timerExpired , 1.0);
    timeOut.attach (&timeOutStopped , 2.0);
    graphButton.rise (&graphButtonPressed);
    currentButton.rise (&currentButtonPressed);
    screen();

    while(1) {
        if (timeOutFlag ==1 ) {
            menu();
        }
                        wait (0.1);
    }
}