![](/media/cache/profiles/abed4d6893be8b9687eab0234e0cac09.jpg.50x50_q85.jpg)
reading only one interrupt when it changes its value
Dependencies: Hotboards_switches mbed
main.cpp
- Committer:
- RomanValenciaP
- Date:
- 2016-03-15
- Revision:
- 1:af16896c2662
- Parent:
- 0:e4efa77cbd55
- Child:
- 2:19c591b8f837
File content as of revision 1:af16896c2662:
/* Library: Hotboards_switches.h * Project: input_change * File: main.cpp * Author: Román Valencia * * Reads an input on pin PB_4, only when its value has been changed */ #include "mbed.h" #include "Hotboards_switches.h" // Creates a single sw object, this interrupt will give us a LOW(0) value when close // because our dip switch works with pull-ups Hotboards_switches sw( PB_4 ); // If your dip switch will gave you a HIGH(1) value when close, then we need to create // the sw object with an extra parameter: Hotboards_switches sw( PB_4 , 1 ); // In any case the function will return a HIGH(1) value any time the sw is closed // For this example we will use the USB serial port, here we initialize it Serial pc(USBTX,USBRX); int main() { while(1) { //Asks when the interrupt changes its value if( sw.hasItChange( ) ) { // When the interrupt is close (or ON) the function will return a true value // it doesn´t matter if our input is configured with pull-ups(LOW) or // pull-downs(HIGH) if( sw.read( ) ) { pc.printf( "sw = close (on)\n\r" ); } else { pc.printf( "sw = open (off)\n\r" ); } // Wait 250 ms, just to not query so often wait_ms( 250 ); } } }