/*#############################################################

Program Name    : ex1_HCSR04_measure
Author          : Grant Phillips
Date Modified   : 15/01/2016
Compiler        : ARMmbed
Tested On       : STM32F4-Discovery

Description     : Example program that demonstrates the use of
                  an HC-SR04 ultrasonic distance sensor.    
                  
                  The output is displayed on a PC using the
                  Serial Wire Viewer (SWV).  See the SWV examples
                  for an explanation of the use of this feature. 

Requirements    : * STM32F4-Discovery Board
              
Circuit         : * The HC-SR04 ultrasonic sensor connected as:
                    VCC     -       +5V
                    TRIG    -       PB8
                    ECHO    -       PA1
                    GND     -       GND
                  * A wire link between PB3 and pin6 of the SWD
                    connector (CN2) as explained in the SWV
                    examples section

##############################################################*/

#include "mbed.h"
#include "SWO.h" 
#include "HCSR04.h"

SWO_Channel SWO;

HCSR04 distance(PB_8, PA_1);    //Create a HCSR04 object with TRIG on PB8 and ECHO on PA1. 
                                //Measurements will now start automatically in the background.

int main() {
    while(1){
       //Use the read_us() function to get this distance pulse in microseconds (us)
       //or read_cm() to get the distance in centimeters (cm).
       SWO.printf("Distance = %d (us)   %f (cm)\n", distance.read_us(), distance.read_cm());
    }
}