Charles Tritt / Mbed 2 deprecated WhatTime

Sends the interval between user button press and release via serial connection to PC. Uses a timer.

Dependencies:   mbed

main.cpp@0:7931706dde3d, 2017-09-17 (annotated)

Committer:
CSTritt
Date:
Sun Sep 17 12:37:43 2017 +0000
Revision:
0:7931706dde3d
My initial version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 0:7931706dde3d 1 /*
CSTritt 0:7931706dde3d 2 Project: WhatTime
CSTritt 0:7931706dde3d 3 File: main.cpp
CSTritt 0:7931706dde3d 4
CSTritt 0:7931706dde3d 5 Uses a timer to display the interval between button press and release.
CSTritt 0:7931706dde3d 6
CSTritt 0:7931706dde3d 7 Created 12 Aug 2017 by Sheila Ross
CSTritt 0:7931706dde3d 8 Last modified 9/17/17 by C. S. Tritt
CSTritt 0:7931706dde3d 9 */
CSTritt 0:7931706dde3d 10 #include "mbed.h"
CSTritt 0:7931706dde3d 11
CSTritt 0:7931706dde3d 12 // Construct a USER_BUTTON digital input.
CSTritt 0:7931706dde3d 13 DigitalIn myButton(USER_BUTTON);
CSTritt 0:7931706dde3d 14
CSTritt 0:7931706dde3d 15 // Construct a timer object.
CSTritt 0:7931706dde3d 16 Timer myTimer;
CSTritt 0:7931706dde3d 17
CSTritt 0:7931706dde3d 18 // Construct a transmit only serial connection over our USB.
CSTritt 0:7931706dde3d 19 Serial pc(USBTX, NC, 9600);
CSTritt 0:7931706dde3d 20
CSTritt 0:7931706dde3d 21
CSTritt 0:7931706dde3d 22 int main()
CSTritt 0:7931706dde3d 23 {
CSTritt 0:7931706dde3d 24 myTimer.start(); // Start the timer.
CSTritt 0:7931706dde3d 25
CSTritt 0:7931706dde3d 26 while(true) { // Main loop.
CSTritt 0:7931706dde3d 27 if (myButton == 0) { // Button is pressed (active low).
CSTritt 0:7931706dde3d 28 // Save the time on timer.
CSTritt 0:7931706dde3d 29 float current_time = myTimer.read();
CSTritt 0:7931706dde3d 30
CSTritt 0:7931706dde3d 31 // Send the time as text via the serial port.
CSTritt 0:7931706dde3d 32 pc.printf("Time difference %f seconds.\n",current_time );
CSTritt 0:7931706dde3d 33
CSTritt 0:7931706dde3d 34 // Reset the timer.
CSTritt 0:7931706dde3d 35 myTimer.reset();
CSTritt 0:7931706dde3d 36
CSTritt 0:7931706dde3d 37 // Wait for the user to release the button.
CSTritt 0:7931706dde3d 38 while(myButton == 0) {
CSTritt 0:7931706dde3d 39 }
CSTritt 0:7931706dde3d 40 }
CSTritt 0:7931706dde3d 41 }
CSTritt 0:7931706dde3d 42 }