File content as of revision 3:075786ca7621:

#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 ; //only loops once to show menu
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 receiveData();
void displayTemperatureGraph();
void displayPressureGraph();




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

void menu() //main menu screen
{
    lcd.clear();
    if (POT>(1.0/2.0)) { //if the potentiometer is pointing to the left
        lcd.printString("Temperature",2,2); //data type label
        lcd.printString(">",76,2); //arrow denoting a different screen can be shown by pointing potentiometer in right direction
        lcd.printString("Graph",0,5);//graph button label
        lcd.printString("Current",42,5);//current button label
        if (graphFlag) { //if the graph button is pressed
            graphFlag = 0; //reset graph flag to 0
                    lcd.printString("Menu",0,5); //menu button label
                    lcd.printString("Current",42,5);//current button label

        }
        if (currentFlag ==1 ) { // if the current button is pressed
            currentFlag = 0; //reset current flag to 0
            while(1) {
                if (timerFlag ==1) { // if the timer flag is set (Timer every 1.0 second)
                    timerFlag = 0; //reset flag to 0
                    displayTemperature(); //display current temperature value
                    lcd.printString("Graph",0,5);//graph button label
                    lcd.printString("Menu",60,5);//menu button label
                }
            } // while loop ends
        }
    } else {
        lcd.printString("Pressure",18,2);//data type label
        lcd.printString("<",2,2);//arrow denoting a different screen can be shown by pointing potentiometer in left direction
        lcd.printString("Graph",0,5);//graph button label
        lcd.printString("Current",42,5);//current button label
        if (graphFlag) { //if the graph button is pressed
            graphFlag = 0; //reset graph flag to 0
            lcd.printString("Menu",0,5);//menu button label
            lcd.printString("Current",42,5);//current button label

        }
        if (currentFlag) { // if the current button is pressed
            currentFlag = 0; //reset current flag to 0
            while(1) {
                if (timerFlag ==1) { // if the timer flag is set (Timer every 1.0 second)
                    timerFlag = 0; //reset flag to 0
                    displayPressure();//display current pressure value
                    lcd.printString("Graph",0,5);//graph button label
                    lcd.printString("Menu",60,5);//menu button label
                }
                wait (0.1); //this wait is required or the screen completely messes up
            } // while loop ends
        }
    }
}

void timerExpired()
{
    timerFlag = 1 ;
}

void timeOutStopped()
{

    timeOutFlag = 1;
}

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

void currentButtonPressed ()
{
    currentFlag = 1;
            serial.printf("current button pressed "); //used for debugging
}
void receiveData() //function to receive data from BMP
{

    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); //used for debugging

    temperature = measurement.temperature ; //formatted temperature
    pressure = measurement.pressure ; //formatted pressure

}


void displayTemperature() //function to display formatted temperature
{
    lcd.clear(); //clear screen
        receiveData(); //get data from function
    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); //used for debugging
    if (length <= 14)  // if string will fit on display
        lcd.printString(buffer,0,2);           // display on screen

}

void displayPressure() //function to display formatted pressure
{
        lcd.clear(); //clear screen
            receiveData(); //get data from function
    char buffer1[14]; //same as temperature
    int length1 = sprintf(buffer1,"P = %.2fmb",pressure); // print formatted data to buffer1
     serial.printf( " L1 %i",length1); //used for debugging
    if (length1 <= 14) // if string will fit on display
        lcd.printString(buffer1,0,2); // display on screen

}

void displayTemperatureGraph() { //function to display temperature graph ober the last hour
}

void displayPressureGraph() { //function to display pressure graph over the last day
}


int main()
{
    lcd.init();//initialise display
    bmp180.init();// initiliase barometer
    timer.attach (&timerExpired , 1.0); //instead of using wait(1.0)
    timeOut.attach (&timeOutStopped , 2.0); //instead of using wait(1.0)
    graphButton.rise (&graphButtonPressed);
    currentButton.rise (&currentButtonPressed);
    screen(); //show the welcome screen

    while(1) {
        if (timeOutFlag ==1 ) {
            menu(); //display menu screen(s)
        }
                        wait (0.1); //necessary wait so screen is clear and easy to read
    }
}