Baser Kandehir / Mbed 2 deprecated digital_In_Out

This a basic program that uses digital input-output functions. It counts how many times the button is pressed and displays the resulting value as 4-bit binary on LPC1768 leds.

Dependencies:   mbed

main.cpp@1:55585733d77e, 2015-07-21 (annotated)

Committer:
BaserK
Date:
Tue Jul 21 08:05:53 2015 +0000
Revision:
1:55585733d77e
Parent:
0:4b9e06ca482c 
MIT license is added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
BaserK 0:4b9e06ca482c 1 /* Digital input output example on LPC1768
BaserK 0:4b9e06ca482c 2 *
BaserK 0:4b9e06ca482c 3 * @author: Baser Kandehir
BaserK 0:4b9e06ca482c 4 * @date: July 9, 2015
BaserK 1:55585733d77e 5 * @license: MIT license
BaserK 1:55585733d77e 6 *
BaserK 1:55585733d77e 7 * Copyright (c) 2015, Baser Kandehir, baser.kandehir@ieee.metu.edu.tr
BaserK 1:55585733d77e 8 *
BaserK 1:55585733d77e 9 * Permission is hereby granted, free of charge, to any person obtaining a copy
BaserK 1:55585733d77e 10 * of this software and associated documentation files (the "Software"), to deal
BaserK 1:55585733d77e 11 * in the Software without restriction, including without limitation the rights
BaserK 1:55585733d77e 12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
BaserK 1:55585733d77e 13 * copies of the Software, and to permit persons to whom the Software is
BaserK 1:55585733d77e 14 * furnished to do so, subject to the following conditions:
BaserK 1:55585733d77e 15 *
BaserK 1:55585733d77e 16 * The above copyright notice and this permission notice shall be included in
BaserK 1:55585733d77e 17 * all copies or substantial portions of the Software.
BaserK 1:55585733d77e 18 *
BaserK 1:55585733d77e 19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
BaserK 1:55585733d77e 20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
BaserK 1:55585733d77e 21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
BaserK 1:55585733d77e 22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
BaserK 1:55585733d77e 23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
BaserK 1:55585733d77e 24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
BaserK 1:55585733d77e 25 * THE SOFTWARE.
BaserK 1:55585733d77e 26 *
BaserK 0:4b9e06ca482c 27 * @description of the program:
BaserK 0:4b9e06ca482c 28 *
BaserK 0:4b9e06ca482c 29 * This a basic program that uses digital input-output functions.
BaserK 0:4b9e06ca482c 30 * It counts how many times the button is pressed and displays the
BaserK 0:4b9e06ca482c 31 * resulting value as 4-bit binary on LPC1768 leds.
BaserK 0:4b9e06ca482c 32 *
BaserK 0:4b9e06ca482c 33 * @connections: Pull up button with 10k resistor is connected to pin 18.
BaserK 0:4b9e06ca482c 34 *
BaserK 0:4b9e06ca482c 35 */
BaserK 0:4b9e06ca482c 36
BaserK 0:4b9e06ca482c 37 #include "mbed.h"
BaserK 0:4b9e06ca482c 38
BaserK 0:4b9e06ca482c 39 /* Activate on board LEDs */
BaserK 0:4b9e06ca482c 40 DigitalOut LPC_led1(LED1);
BaserK 0:4b9e06ca482c 41 DigitalOut LPC_led2(LED2);
BaserK 0:4b9e06ca482c 42 DigitalOut LPC_led3(LED3);
BaserK 0:4b9e06ca482c 43 DigitalOut LPC_led4(LED4);
BaserK 0:4b9e06ca482c 44
BaserK 0:4b9e06ca482c 45 DigitalIn button(p18); // button (pull-up) is connected to P18
BaserK 0:4b9e06ca482c 46
BaserK 0:4b9e06ca482c 47 /* Function prototype */
BaserK 0:4b9e06ca482c 48 void ledCounter(int value);
BaserK 0:4b9e06ca482c 49
BaserK 0:4b9e06ca482c 50 int count=0;
BaserK 0:4b9e06ca482c 51
BaserK 0:4b9e06ca482c 52 int main()
BaserK 0:4b9e06ca482c 53 {
BaserK 0:4b9e06ca482c 54 while(1)
BaserK 0:4b9e06ca482c 55 {
BaserK 0:4b9e06ca482c 56 if(button.read()==0) // if the button is pressed
BaserK 0:4b9e06ca482c 57 {
BaserK 0:4b9e06ca482c 58 while(button.read()==0); // wait until release
BaserK 0:4b9e06ca482c 59 wait_ms(20); // button debounce
BaserK 0:4b9e06ca482c 60 count++; // count up
BaserK 0:4b9e06ca482c 61 count%=16; // count (mod 16)
BaserK 0:4b9e06ca482c 62 }
BaserK 0:4b9e06ca482c 63 ledCounter(count); // display the count
BaserK 0:4b9e06ca482c 64 }
BaserK 0:4b9e06ca482c 65 }
BaserK 0:4b9e06ca482c 66
BaserK 0:4b9e06ca482c 67 // This function can display value(mod 16) as binary on LPC1768
BaserK 0:4b9e06ca482c 68 // For example = 12 = (1010) led2 and led4 will be ON, led1 and led3 will be OFF.
BaserK 0:4b9e06ca482c 69 void ledCounter(int value)
BaserK 0:4b9e06ca482c 70 {
BaserK 0:4b9e06ca482c 71 LPC_led1=value%2;
BaserK 0:4b9e06ca482c 72 LPC_led2=(value>>1)%2;
BaserK 0:4b9e06ca482c 73 LPC_led3=(value>>2)%2;
BaserK 0:4b9e06ca482c 74 LPC_led4=(value>>3)%2;
BaserK 0:4b9e06ca482c 75 }