File content as of revision 0:2ce0698a332d:

#include "mbed.h"

Serial pc(PA_2, PA_3);               // This is USB tx, rx
Serial sensor_uart(PA_9, PA_10);        // This is USART2 tx, rx

DigitalOut myled(PB_5);             // This is USER LED
DigitalOut myled2(PA_7);             // This is USER LED
DigitalIn BlueButton(PB_9);   // This is Blue-Button

#define Pressed 0
#define NotPressed 1

int USBByte='\0';
int GaugeByte='\0';
int n=0;
int readgauge = 0;
Timer t;
char str[5];
long millis = 0;

void PC_INT()  // USART2 used for Debug
{
    // Note: you need to actually read from the serial to clear the RX interrupt
    pc.putc(pc.getc());
    myled = (myled)?(0):(1);
}

void SENSOR_USART_INT()  // SENSOR_USART
{
    // Note: you need to actually read from the serial to clear the RX interrupt
    //myled = 1;
    //Serial3.scanf(str);
    //sensor_uart.scanf("%5s", str);
    //str = strcat ("   PISKA   ", str);
    //sprintf(millis, "%d", t.read_ms());
    //int k = 0;
    //for (k = 0; k < 10; k++){;}
    //str = strcat (millis, str);
    //pc.printf(str);
    //pc.printf(millis);
    if (sensor_uart.getc() == 'R') {
        myled = (myled)?(0):(1);
        pc.printf("timestamp: %d; gauge value: %s\r\n", t.read_ms(), sensor_uart.gets(str, 5));
    }
}

int main()
{
    myled = 0;

    // SetUp the baud rate
    pc.baud(9600);
    sensor_uart.baud(9600);

    sensor_uart.attach(&SENSOR_USART_INT);
    pc.attach(&PC_INT);

    t.start();

    pc.printf("\n\r\n\r|||||START MAIN|||||\n\r");

    while(1) {
        // Test the Blue Button
        while(BlueButton == Pressed) {
            myled2 = BlueButton;
            pc.printf("Please release the BLUE Button\n\r");
        }
    }
}