Roman Valencia / Mbed 2 deprecated button_status

reading a button state

Dependencies:   Hotboards_buttons mbed

main.cpp@0:538950d8a034, 2016-02-29 (annotated)

Committer:
RomanValenciaP
Date:
Mon Feb 29 20:59:52 2016 +0000
Revision:
0:538950d8a034
first release - recquires approval

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RomanValenciaP 0:538950d8a034 1
RomanValenciaP 0:538950d8a034 2 /*
RomanValenciaP 0:538950d8a034 3 * The simplest program, read a single button on pin PB_4
RomanValenciaP 0:538950d8a034 4 */
RomanValenciaP 0:538950d8a034 5
RomanValenciaP 0:538950d8a034 6 #include "mbed.h"
RomanValenciaP 0:538950d8a034 7 #include "Hotboards_buttons.h"
RomanValenciaP 0:538950d8a034 8
RomanValenciaP 0:538950d8a034 9 //Creates a single button object, when the button is pressed it gives you
RomanValenciaP 0:538950d8a034 10 //a LOW(0) value because it works with pull-ups.
RomanValenciaP 0:538950d8a034 11 Hotboards_buttons btn( PB_4 );
RomanValenciaP 0:538950d8a034 12 //If your buttons gives you a HIGH(1) value when is pressed, then we need
RomanValenciaP 0:538950d8a034 13 //to create the button object with and extra parameter:
RomanValenciaP 0:538950d8a034 14 //Hotboards_buttons btn( PB_4 , 1 ); in any case the functions will return
RomanValenciaP 0:538950d8a034 15 //a HIGH(1) value any time the button is pressed
RomanValenciaP 0:538950d8a034 16
RomanValenciaP 0:538950d8a034 17 //To our example we will use the led on the nucleo board
RomanValenciaP 0:538950d8a034 18 DigitalOut nucleoLed( LED1 );
RomanValenciaP 0:538950d8a034 19
RomanValenciaP 0:538950d8a034 20 int main()
RomanValenciaP 0:538950d8a034 21 {
RomanValenciaP 0:538950d8a034 22 while(1)
RomanValenciaP 0:538950d8a034 23 {
RomanValenciaP 0:538950d8a034 24 //The moment when the button is pressed the function will return a HIGH(1)
RomanValenciaP 0:538950d8a034 25 //value, it doesn`t matter if your button is configured with pull-ups(LOW)
RomanValenciaP 0:538950d8a034 26 //or pull-downs(HIGH)
RomanValenciaP 0:538950d8a034 27 if( btn.status() )
RomanValenciaP 0:538950d8a034 28 {
RomanValenciaP 0:538950d8a034 29 //Button is pressed, led on the nucleo board is ON
RomanValenciaP 0:538950d8a034 30 nucleoLed = 1;
RomanValenciaP 0:538950d8a034 31 }
RomanValenciaP 0:538950d8a034 32 else
RomanValenciaP 0:538950d8a034 33 {
RomanValenciaP 0:538950d8a034 34 //Button is not pressed, led on the nucleo board is OFF
RomanValenciaP 0:538950d8a034 35 nucleoLed = 0;
RomanValenciaP 0:538950d8a034 36 }
RomanValenciaP 0:538950d8a034 37 //Just to poll not so often
RomanValenciaP 0:538950d8a034 38 wait_ms( 50 );
RomanValenciaP 0:538950d8a034 39 }
RomanValenciaP 0:538950d8a034 40 }