File content as of revision 46:162ed3f051b2:

#include "mbed.h"
#include "display_modules.h"
#include "touch_modules.h"
#include "ecg_dec.h"
#include "touch_modules.h"
#include "glc.h"
#include "bp.h"
#include "sdcard.h"
#include "eeprom_pgm.h"
#include "struct.h"
#include "battery.h" 
#include "main.h"

#define TIMER_RXACK_BTCONNECTION                10000
#define BATTERY_TIMER_VALUE                     600000
#define SERIAL_BAUD_RATE                        115200
#define BATTERY_SCREEN_NO_CHARGE_CONDITION      3

Serial gc(USBTX, USBRX);
DigitalIn q1(PTB11);
DigitalIn q(PTC5);
DigitalIn q3(PTC12);
DigitalIn BT(PTA5);   
Serial blue1(PTC4,PTC3);  
uint32_t get_timer_bluetooth();
static void battery_status_monitoring();                                     //bluetooth status pin
uint8_t touch(uint8_t state);                                               // touch state
uint8_t display(uint8_t state1);                                            //  display state

static uint8_t nstate=0;
static uint8_t nstate1=0;
static uint32_t pid = 0;                                                    // patient ID
static bool file_created_status = false;                                  //initialise file created to 0
static uint32_t filepid_btpid[2] = {};
Timer timer_bt;                                                         // timer for bluetooth 
Timer timer_battery;                                                     // timer for battery



int main()
{
    static uint8_t main_state=1;
    static uint8_t state_display = 0;
    static uint8_t state_touch = 1;
    static uint8_t state_t = 1;                                     // state to transmit to bluetooth
    static uint8_t state_r = 0;                                     // state to receive from bluetooth

  
  
    DisableTouch();
    gc.baud(115200);
    init_screen();                                                  //initialize lcd
    pid = get_filepid();
    screen_main();                                                  // display of main screen 
    battery_monitor();                                                          // monitor battery at the start only
    battery_status_display();                                                   // display of main screen
    timer_battery.start();

   while(1)
   {
        battery_status_monitoring();                                            // to  monitior battery status after every 10 min. 

        if (get_battery_status() == BATTERY_SCREEN_NO_CHARGE_CONDITION)   // to check battery status and take action 
        {        
                 DisableTouch();
        }
        else
        {

            EnableTouch();
            switch(main_state)                                             // main state machine
             {
                case 1:  
                         state_display = touch(state_touch);             // touch state 
                         if(state_display == 12)
                         {
                            main_state = 3;
                         }
                        else 
                         {
                            main_state = 2;
                         }
                        break;
    
                case 2:    
                         state_touch = display(state_display);           //display state
                         main_state = 1;
                        break;
                
                
                case 3: 
                        DisableTouch();                                             // bluetooth send 
                        timer_bt.start();
                         if(get_timer_bluetooth()<TIMER_RXACK_BTCONNECTION)                           // bluetooth connection timer 15 sec
                         {
                        
                            if(BT==1)                                                    // checking for bluetooth connection
                            {
                    
                               timer_bt.stop();                                        // stop the timer once connected to app
                               timer_bt.reset(); 
                               BT_connection() ;                                // displaying connection on bluetooth 
                               state_r=bt_send(state_t);
                               timer_bt.start();
                                    
                                if (state_r==0)                                  // if the state received is zero, then there is no new file to send
                                    {
                                        timer_bt.stop();                           // stop the timer once connected to app
                                        timer_bt.reset();
                                        BT_finished();                         // screen to display communication finished
                                        screen_BT_return();                    //screen to return back
                                        EnableTouch();
                                        main_state=1;
                                        state_touch=12;
                                        break;
                                     }
                                   
                                else 
                                    {
                                        main_state=4;                           // move to receving stste of bluetooth
                                    }
                          
                            }  
                  
                            else   
                            {
                             BT_no_connection();     // display screen to show that there is no connection
                            }
                         }

                        else
                        {                                   
                             BT_no_connection();     // display screen to show that there is no connection
                            gc.printf("stopped");
                            screen_BT_return();     // button to return
                            EnableTouch();
                            main_state=1;
                            state_touch=12;
                            timer_bt.stop();
                            timer_bt.reset();
                        }
                        break;
                 
                case 4: 
                        DisableTouch();  
            
                        if(get_timer_bluetooth()<TIMER_RXACK_BTCONNECTION)
                        {
                            if (blue1.readable())         // if there is data to receive enter the loop
                            {
                               
                                state_t=bt_receive(state_r);
                                timer_bt.stop();
                                timer_bt.reset();
                                if(state_t ==0)           // if state_t is zero, there is no other file to send
                                 {
                                  
                                    BT_finished();
                                    screen_BT_return();  
                                    EnableTouch();
                                    main_state=1;
                                    state_touch=12;  // jumping to touch case 12
                                    break;
                                  } 
                                else                                 // move to bluetooth transmit if the states are 1,2,3,4
                                 {
                                    main_state=3;
                                 }  
                            }
                         }                 
                   
                        else 
                        {    
                            DisableTouch();
                            BT_no_connection();                     // display screen to show that there is no connection
                            gc.printf("stopped");
                            screen_BT_return();                     // button to return
                            EnableTouch();
                            main_state=1;
                            state_touch=12;
                            sd_close();                             ///close the opened file which was used for bluetooth
                            timer_bt.stop();
                            timer_bt.reset();
                        }
                        break;      
             }         
        }        
   } 

}
uint8_t touch(uint8_t state)
{
   static  uint8_t state1=0;
   detect_touch(state);                                             // determine the touch points
    
    switch(state)                                                   // state for touch
  {
      case 1:   
                state1=touch_main();                                // determining the touch for main screen 
                state=0;
                nstate1=state1;
                break;
               
      case 2: 
                state1=touch_main_1();                              // determining the touch for SYSTEM CONFIGURATION screen 
                state=0;
                nstate1=state1;
                break;
                
      case 3:  
                state1=touch_main_2();                              // determining the touch for TEST screen                 
                state=0;
                nstate1=state1;
                break;
        
      case 4: 
                state1=touch_glc();                                 // determining the touch for GLC screen 
                state=0;
                nstate1=state1;
                break;       
        
      case 5: 
                state1=touch_ecg();                                 // determining the touch for ECG screen 
                state=0;
                nstate1=state1;
                 break;   
     case 6: 
                state1=touch_ret();                                 // determining the touch for returning back to the main screen      
                state=0;
                nstate1=state1;
                break;
                
     case 7: 
                state1=touch_again_ecg();                          // determining the touch when readings are taken more than once screen 
                state=0;
                nstate1=state1;
                break;
                
     case 8:    
                state1=touch_bp();                                  // determining the touch for BP screen 
                state=0;
                nstate1=state1;
                break;           
                
     case 9:    
                state1=touch_again_glc();  
                state=0;
                nstate1=state1;
                break;            
                
     case 10 :  
                DisableTouch();
                wait_ms(300);
                EnableTouch();
                state=nstate;
                break;
                  
                  
      case 11:   
                state1=touch_again_bp();            
                state=0;
                nstate1=state1;
                break;
      
      case 12:   
                state1=BT_return();            
                state=0;
                nstate1=state1;
                break;
      
     default :  
                DisableTouch();
                wait_ms(300);
                EnableTouch();
                state=nstate;
                break;          
                          
    }         
     
    return state1;
}
  
  
uint8_t display(uint8_t state1)
{
    static uint8_t state=0;
    static uint8_t ecg_flag=0;                                  // ecg_flag to indicate the ecg test is already done for the same pid
    static uint8_t glc_flag=0;                                  // glc_flag to indicate the glc test is already done for the same pid
    uint16_t heart_rate=0; 
    
    
    switch(state1)                                              // state for display screens
    {

      
      case 1: 
                DisableTouch();
                screen_main();                                  //  main screen 
                state1=0;
                state=1;
                nstate=state;
                ecg_flag=0;                                     // ecg, glc flag to determine whether the readings are taken more than once
                glc_flag=0;
                clear_filecreated_status();
                pid = get_filepid();
                battery_status_display();                          //Display battery status on LCD
                EnableTouch();
                break;
      
      case 2: 
                DisableTouch();
                screen_main_1();                                // System configration screen 
                state1=0;
                state=2;
                nstate=state;
                battery_status_display();                                           //Display battery status on LCD
                EnableTouch();
                break;
               
      case 3: 
                DisableTouch();
                //sd_read(pid_btpid);                             //read pid from sd card
                //pid=pid_btpid[0];                               //copy pid to a variable
                gc.printf("pidinit=%d",pid);
                screen_main_2(pid);     
                state1=0;
                state=3;
                nstate=state;
                battery_status_display(); 
                EnableTouch();
                break;
                
      case 4: 
                DisableTouch();
                if (glc_flag==1)                                // glc_flag=1 when already the reading has been taken 
                {
                    screen_again();    
                    state1=0;
                    state=9;
                    nstate=state;
                }
                else
                { 
                    screen_glc();                                       // glc screen
                    state1=0;
                    state=4;
                    nstate=state;
                }
                EnableTouch();
                
                break;
     
     
     case 5:     
                DisableTouch();
                if (ecg_flag==1)
                {
                    screen_again();
                    state1=0;
                    state=7;
                    nstate=state;
                }
                
                else
                {   
                    screen_ecg();                                           //ecg main screen 
                    state1=0;
                    state=5;
                    nstate=state;
                }
                EnableTouch();
                break;
     
     case 6:   
                DisableTouch();
                screen_bp();                                                 // bp main screen
                state1=0;
                state=8;
                nstate=state;         
                EnableTouch();        
                break;
     
     case 7:    
                DisableTouch();     
                glc(pid);                                                       // glc measurement
                glc_flag=1;
                wait(1); 
                state1=0;
                screen_glc_2();
                state=6;
                eprom_write_8(30,0);
                nstate=state;        
                EnableTouch();
                break;
    
    case 8:     DisableTouch();
                ecg_countdown();                                                // countdown before ecg capture
                heart_rate=ecg(pid);                                            // capturing ecg
                state1=0;
                if (heart_rate==0)
                    {
                       
                       screen_ecg_lead();  
                     }
                else if(heart_rate==1)                                          // if heart rate goes above or below range display error // 10/7/17 nikita
                     {
                          screen_ecg_error();
                         
                         }      
                  else 
                       {
                       
                         screen_ecg_2(heart_rate);
                         ecg_flag=1;
                         }                            
                state=6;
                eprom_write_8(30,1);
                nstate=state;
                screen_ecg_bp();
                EnableTouch();
                break;
             
    case 9: 
                DisableTouch();
                screen_bp2();                                                   // bp main screen
                bp_countdown();                                                 // countdown for bp 
                bp(pid);                                                        // measuring bp   earlier bp() changed to bp(pid) 28/4/2017
                state1=0;
                state=6;
                eprom_write_8(30,2);
                nstate=state;
                EnableTouch();
                 break;
 
                          
      case 10 :  DisableTouch();
                 wait_ms(300);
                 EnableTouch();
                 state=nstate;
                  break;        
                  
      case 11 :    
                DisableTouch();
                //sd_read(pid_btpid);                                         //read pid from sd card 
                //current_test_pid=pid_btpid[0];
                //bt_file_sent_pid=pid_btpid[1];
                //screen_patient_info(current_test_pid, bt_file_sent_pid);
                screen_patient_info(get_filepid(), get_btpid());
                state1=0;
                state=12;
                EnableTouch();
                break;           
                     
       
        default :  
                  
                  state1=nstate1;
                   break;          
                            
            
    }            
    
           
                
    return state;       
                
}


bool get_filecreated_status(void)                                               //function to get file created status
{
    return file_created_status;
}

void set_filecreated_status(void)                                               //function to set file created status
{
    file_created_status = true;
}


void clear_filecreated_status(void)                                             //function to clear file created status
{
    file_created_status = false;
}

void increment_filepid (void)                                                       //increment pid if a test is completed
{
    //uint32_t filepid_btpid[2] = {};
    
    //set_filecreated_status();                                                   //set it to make it append mode
    sd_read(filepid_btpid);                                                     //read pid from sd card
    filepid_btpid[0] = filepid_btpid[0] + 1;                                    //increment it by 1
    sd_write(filepid_btpid);                                                    //write it back to sd card
    
} 

void increment_btpid (void)                                                       //increment pid if a test is completed
{
    //uint32_t filepid_btpid[2] = {};
    
    //set_filecreated_status();                                                 //set it to make it append mode
    sd_read(filepid_btpid);                                                     //read pid from sd card
    filepid_btpid[1] = filepid_btpid[1] + 1;                                    //increment it by 1
    sd_write(filepid_btpid);                                                    //write it back to sd card
    
} 

uint32_t get_filepid(void)
{
    //uint32_t filepid_btpid[2] = {};  
    uint32_t filepid = 0;    
    
    sd_read(filepid_btpid);                                                           //read pid from sd card
    filepid = filepid_btpid[0];                                  
    return filepid; 
    
}   

void store_filepid(uint32_t pid)
{
       //uint32_t filepid_btpid[2] = {};
        sd_read(filepid_btpid);                                                       //read pid from sd card
        filepid_btpid[0] = pid;                                              
        sd_write(filepid_btpid);                                                      //write it back to sd card
                                                        
} 

uint32_t get_btpid(void)
{
    //uint32_t filepid_btpid[2] = {}; 
    uint32_t btpid = 0;    
    
    sd_read(filepid_btpid);                                                           //read pid from sd card
    btpid = filepid_btpid[1];                                  
    return btpid; 
    
}   

void store_btpid(uint32_t bt_pid)
{
       //uint32_t filepid_btpid[2] = {};
    
        sd_read(filepid_btpid);                                                       //read pid from sd card
        filepid_btpid[1] = bt_pid;                                              
        sd_write(filepid_btpid);                                                      //write it back to sd card
                                                        
} 


uint32_t get_timer_bluetooth()
{
  return  timer_bt.read_ms(); 
} 

void battery_status_monitoring()
{
    if(timer_battery.read_ms() > BATTERY_TIMER_VALUE ) 
    {
        battery_monitor();
        timer_battery.reset();
    }
}