File content as of revision 9:62d6559f0d50:

/*
ELEC2645 Embedded Systems Project
School of Electronic & Electrical Engineering
University of Leeds
2019/20

Name:Zeyu Feng
Username:el19zf
Student ID Number:201377605
Date:11/3/2020
*/

// includes
#include "mbed.h"
#include "Gamepad.h"
#include "N5110.h"
#include "People.h"
#include "PeopleEngine.h"
#include "shot.h"
#include "Collision.h"


// objects
Gamepad pad;
N5110 lcd;
PeopleEngine engine;
shot shot;
Collision collision;

//flag and triggers
Ticker ticker;//gradually increase number of shots
Timeout timeout;
volatile int timer_flag = 0;
volatile int timeout_flag = 0;
volatile int count_flag = 30;

//    functions
void flip()
{
    timer_flag = 1;
}
void time_out()
{
    timeout_flag = 1;
}
void init();
void control_check();
void draw();
void shot_update();
void count_down();

int main()
{
    //initial
    init();
    //set a ticker
    ticker.attach(&flip,2);
    timeout.attach(&time_out,5);

    //a infinite loop to control position of the people, update the game state
    while(1) {
        if(timer_flag == 1) {
            timer_flag = 0;
            if(shot.get_size() < 30){
                int size = shot.get_size()+ 4;
                shot.set_size(size);
            }
        }
        lcd.clear();
        //   shot update
        shot_update();
        
        //   control people and check collision
        if(timeout_flag){
            control_check();
        } 
        draw();
        if(!timeout_flag){
            count_down();
        }
        lcd.refresh();
        //printf("shot refresh\n");
        //printf("size = %d\n",shot._size);
        wait_ms(1000/6);//fps = 6
    }
}


void init()
{
    lcd.init();
    lcd.setContrast(0.5);
    engine.init();
    pad.init();
    shot.init();
    collision.init();
    lcd.refresh();
}

void control_check()
{
    engine.read_input(pad);
    engine.update();
    collision.set_pos(engine.get_pos());
    if(collision.check(lcd)) {
        engine.init();
        lcd.clear();
        shot.init();
    }
}

void draw()
{
    engine.draw(lcd);
    collision.draw(lcd);
}

void shot_update()
{
    shot.update();
    shot.delete_shot();
    shot.gen_shot();
    shot.draw(lcd);
}

void count_down()
{   
    char buffer[6];
    sprintf(buffer,"%d",(int)count_flag/6);
    lcd.printString(buffer,40,2);
    printf("count: %d\n",count_flag);
    count_flag--;
}