File content as of revision 8:7e48229d678c:

#include "mbed.h"
#include "ultrasonic.h"
#include "N5110.h"
#include "Joystick.h"
#include "main.h"

/***************************************************************************//**
*
* the main code below sets all the interrupts to pull down and also for the start
* and back buttons it is sent to the specific start and back functions which sets
* the flags which are then used in other functions.
*
* the mu.startUpdates() is where the ultrasonic sensor is told to start measuring
* the distances.
* the joystick and lcd are then initialised and the man menu function is then
* called.
*
*******************************************************************************/

int main()
{

    R.mode(PullDown);
    L.mode(PullDown);
    Start.mode(PullDown);
    Start.rise(Start_isr);
    Back.mode(PullDown);
    Back.rise(Back_isr);
    // printf("set buttons");
    
    mu.startUpdates();
    // printf ("Ultrasonic Updates started");
    
    joystick.init();
    // printf("initialise joystick")
    init_display();
    
    main_menu();
    
}

/***************************************************************************//**
*
* added function which initalise the display and sets the contrast, this is
* called from the int main and so the LCD boots up on startup.
*
*******************************************************************************/

void init_display(){
    
    // printf("initialise display");    
    lcd.init();
    lcd.setContrast(0.4);
    lcd.clear(); 
        
    }

/***************************************************************************//**
*
* this function is the main menu for the program, it is called at the start and 
* depending on what string is selected, clicking the start uton will send the
* user to the specified function.
*
*******************************************************************************/      
    
void main_menu(){
    
    // printf("main menu");
    
    lcd.clear();
    Start_flag = 0;
    int select = 0;
    output = 63; // 63 on the bus output sets all LEDs to off

    while (1) {
        
    Direction d = joystick.get_direction();   
    // printf("Direction = %i\n",d);
    
        switch(select) {
            case 0:
                switch(d) {
                    case N:
                        select = 1;
                    // printf("UP");
                        break;
                    case S:
                        select = 1;
                    // printf("Down");
                        break;
}
                break;
            case 1:
                switch(d) {
                    case N:
                        select = 0;
                    // printf("UP");
                        break;
                    case S:
                        select = 0;
                    // printf("Down");
                        break;
}
                break;
 
        }
                wait(0.1);
        if (select == 0) {
            // printf("main menu - sense object");
            lcd.clear();
            lcd.printString("Detect",27,0);
            lcd.printString("Sense Object",7,2);
            lcd.printString("Calibration",7,3);
            lcd.drawCircle(3,19,2,FILL_TRANSPARENT);
            lcd.refresh();
            wait(0.15);
            if (Start_flag == 1) {
                Start_flag = 0;
                sense_object();
            }
        } else if (select == 1) {
            // printf("main menu - calibration");
            lcd.clear();
            lcd.printString("Detect",27,0);
            lcd.printString("Sense Object", 7,2);
            lcd.printString("Calibration",7,3);
            lcd.drawCircle(3,27,2,FILL_TRANSPARENT);
            lcd.refresh();
            wait(0.15);
            if (Start_flag == 1) {
                Start_flag = 0;
                calibrate_object();
            }
        }
    }
}

/***************************************************************************//**
*
* this function is for sensing the object
*
*******************************************************************************/ 

void sense_object(){
    
    // printf("sense object");  
        
    // set inital state 
    int state = 0;
    
    while(1)
    {
    output = fsm[state];  // output current state
    // printf("state = %d\r\n",state);
    
    // check which state we are in and see which the next state should be
    switch(state) {
        case 0:
        lcd.clear();
        lcd.printString(" object at 0'",0,0);
        lcd.printString("   R + 60'",0,2);
        lcd.printString("   L - 60'",0,4);
        lcd.refresh();
            if (R == 1){
                state = 1;}
            else if (L == 1){
                state = 5;}
            else state = 0;
                break;
        case 1:
        lcd.clear();
        lcd.printString(" object at 60'",0,0);
        lcd.printString("   R + 60'",0,2);
        lcd.printString("   L - 60'",0,4);
        lcd.refresh();
            if (R == 1){
                state = 2;}
            else if (L == 1){
                state = 0;}
            else state = 1;
                break;
        case 2:
        lcd.clear();
        lcd.printString(" object at 120'",0,0);
        lcd.printString("   R + 60'",0,2);
        lcd.printString("   L - 60'",0,4);
        lcd.refresh();
            if (R == 1){
                state = 3;}
            else if (L == 1){
                state = 1;}
            else state = 2;
                break;
        case 3:
        lcd.clear();
        lcd.printString(" object at 180'",0,0);
        lcd.printString("   R + 60'",0,2);
        lcd.printString("   L - 60'",0,4);
        lcd.refresh();
            if (R == 1){
                state = 4;}
            else if (L == 1){
                state = 2;}
            else state = 3;
                break;
        case 4:
        lcd.clear();
        lcd.printString(" object at 240'",0,0);
        lcd.printString("   R + 60'",0,2);
        lcd.printString("   L - 60'",0,4);
        lcd.refresh();
            if (R == 1){
                state = 5;}
            else if (L == 1){
                state = 3;}
            else state = 4;
                break;
         case 5:
        lcd.clear();
        lcd.printString(" object at 300'",0,0);
        lcd.printString("   R + 60'",0,2);
        lcd.printString("   L - 60'",0,4);
        lcd.refresh();
            if (R == 1){
                state = 0;}
            else if (L == 1){
                state = 4;}
            else state = 5;
                break;
            default:
                error("Invalid state");  //invalid state - call error routine
                // or could jump to starting state i.e. state = 0
                break;  
        }
        if (Back_flag == 1) {
            Back_flag = 0;
            main_menu();}
            
        ThisThread::sleep_for(200);
        }
        }

/***************************************************************************//**
*
* this function is for calibrating the distance in which the object centre point
* should be away from the sensor, it checks the current distance and then though
* the function "void dist" displays the current distance on the screen.
* this function also tells the user the distance away from the target centre 
* point this should be, this is so that the board is the right distance away and
* will be able to detect the object better.
*
* in order to print the distance onto the LCD the current distance is printed to
* a buffer which is a max length of 14 (the amount of characters that can fit
* width ways on the screen) this can then be printed on the screen using print
* string.
*
*******************************************************************************/
     
void calibrate_object(){
     
     while(1)
    {
        mu.checkDistance();     
        
        if (Back_flag == 1) {
            Back_flag = 0;
            main_menu();}
            
        wait (1);
        }
        }
        
void dist(int distance)

{
    // printf("Distance changed to %dmm\r\n", distance);

     lcd.clear();
     
     char buffer[14];
     int length = sprintf(buffer,"%dmm", distance);
     if (length <= 14)
    
     lcd.printString("set object to",0,0);
     lcd.printString("    1000mm",0,1);
     lcd.printString(    buffer,0,3);
     lcd.refresh();
    }

/***************************************************************************//**
*
* these functions are for setting the flags for the start and back butons which
* are used in the other functions.
*
*******************************************************************************/
      
void Start_isr()
    {
    // printf("start button pressed"); 
    Start_flag = 1;
    }

void Back_isr()
    {
    // printf("back button pressed"); 
    Back_flag = 1;
    }