File content as of revision 1:82631d83e51e:

#include "mbed.h"
#include "rtos.h"
#include "TextLCD.h"

TextLCD lcd(p15,p16,p17,p18,p19,p20,TextLCD::LCD16x2);
Serial pc(USBTX, USBRX); //set up serial
DigitalOut natAPace(LED1); //leds for pacing
DigitalOut natVPace(LED2);
DigitalOut aPace(LED3);
DigitalOut vPace(LED4);
DigitalOut alarm(p5); //pin for alarm

DigitalOut a_signal(p6); //connected to pm
DigitalOut v_signal(p7); //connected to pm

unsigned int a_time = 0;
unsigned int v_time = 0;

int mode = 0; //0 = random, 1 = manual, 2 = test

//constants

const int minwait_A = 10; //all in msec
const int minwait_V = 20;
const int LRI = 1000;
const int VRP = 400;
const int PVARP = 500;
const int URI = 1000;
const int AVI = 100;

void random_mode() {
    if(a_time >= min_waitA) {
        send_signal(0);
        a_time = 0;    
    }
    if(v_time >= min_waitV) {
        send_signal(1);
        v_time = 0;
    }
}

void switch_modes() {
    switch(mode) {
        case 0: //becomes random
            break;
        case 1: //becomes manual
            break;
        case 2: //becomes test
            break;
        
    }    

}


void received_apace() {
    //TODO: DO 
    aPace = 1;
       
}

void received_vpace() {
    //TODO: DO
    vPace = 1;
        
}

void send_signal(int type) { //type=0 a_signal, type=1 v_signal
        
        switch(type) {
            case 0:
                a_signal = 1;
                natAPace = 1;
            case 1:
                v_signal = 1;
                natVPace = 1;
        }
        wait(1); 
        a_signal = 0;
        v_signal = 0;
        natAPace = 0;
        natVPace = 0
}

void heart_keyboard() {
    while(true) { //thread is continuously running
            if(pc.readable()) {
                char c = pc.getc();
                
                switch(c) {
                    case 'r': //set to random mode
                        mode = 0;
                        break;
                    case 'm': //set to manual mode
                        mode = 1;
                        break;
                    case 't': //set to test mode
                        mode = 2;
                        break;
                    case 'a': //asignal
                        if(mode) { //only if in manual (heart_mode == 1)
                            send_signal(0);
                        }
                        break;
                    case 'v': //vsignal
                        if(mode) { //only if in manual (heart_mode == 1)
                            send_signal(1);
                        }
                        break; 
                    default: //erroneous key get rid of it
                        break;
                }
            }
    }
}

void tick() {
    a_time++;
    v_time++;   
}

int main() {
    //TODO: Set up threads
    
}