File content as of revision 3:7d014ee1c543:

// Goal: Program that receives and send 4 channels of data.
// Receives: 1kHz
// Sends: 70kbits/s
// Ver qual o melhor modo de blueth (i2C,SPI,UART);
/* DONE:
    Receber sinais Analógicos
  */ 
/* TO DO:
    Juntar ao módulo Bluetooth  
  */

#include "mbed.h"

/*--------------Signal Definition-----------------*/

#define ECG1 0
#define ECG2 1
#define RESP 2
#define PPG 3

/*------------- Sample Speed Timer --------*/
#define TIMER_RATE 1

/*-----READS THE ANALOG SIGNAL FROM THE SENSORS-----*/

AnalogIn Ecg1(A0);
AnalogIn Ecg2(A1);
AnalogIn Resp(A3);
AnalogIn Ppg(A4);


/*------CONTROLS THE DATA RATE OF THE READING------*/
Ticker t0;
Serial pc(USBTX,USBRX);


/*------HANDLES THE TIMER AND SERIAL INTERRUPTIONS------------*/

void t0_handler(void);
void rx_Handler(void);

char test = 0;  // Tests the data received from the computer in order to start the reading 
bool Valor=0;
bool rx_Interrupt = 0;    
bool TimerStatus = 0;

/*------------BUFFER TO STORE DATA------------------*/

int buffer[4] = {0,0,0,0};



int main() {
    pc.printf("main");
    pc.attach(&rx_Handler, pc.RxIrq);
    
    while(1){
        
    while(rx_Interrupt){
        
        if(test == '2'|| test == '2')
    {   // wake up routine
        t0.attach(&t0_handler,TIMER_RATE); //start counting ----Data read in a 1kHz freq. (1mS)  
        
    }else if (test=='3'|| test == '3')
        {
    t0.detach();
        }               
        
        
        rx_Interrupt = 0;
    }
    
    if (TimerStatus){
        
        buffer[ECG1] = Ecg1.read_u16();
        buffer[ECG2] = Ecg2.read_u16();
        buffer[RESP] = Resp.read_u16();
        buffer[PPG] = Ppg.read_u16(); 
        pc.printf("%i,%i,%i,%i\n",buffer[ECG1],buffer[ECG2],buffer[RESP],buffer[PPG]);
        TimerStatus = 0;
        }

}}

/*----------------------FUNCTIONS-----------------------*/

    //Reads and send data to the computer 

void t0_handler(void){
    TimerStatus = 1;    
    }

void rx_Handler(void){
    
    // A programação não estava funcionando poisnão se deve utilizar interrupções para realizar grandes tarefas;
    // Elas travam e não funciona mais nada.
    // Como fazer para não ficar testando no main?? Sexta feira no globo reporter
    
    rx_Interrupt = 1;
    test = pc.getc();    // it gets the received character
    pc.putc(test);
  
}