![](/media/cache/group/mcu.png.50x50_q85.jpg)
Demonstrates handling events of a 4x4 keypad Forked from https://developer.mbed.org/users/Hotboards/code/Hotboards_EventKeypad/
Dependencies: Hotboards_keypad mbed
Fork of Hotboards_EventKeypad by
main.cpp
- Committer:
- icserny
- Date:
- 2016-05-30
- Revision:
- 2:252f5ac72f2d
- Parent:
- 1:88d227ecb9b3
File content as of revision 2:252f5ac72f2d:
/* @file Hotboards_keypad.cpp || @version 1.2 || @modified by Istvan Cserny || @contact https://developer.mbed.org/users/icserny/ || @version 1.1 || @modified by Diego (http://hotboards.org) || @author Alexander Brevig || @contact alexanderbrevig@gmail.com || || @description || | Demonstrates using the KeypadEvent. || || Hardware requirements: || - FRDM-KL25Z board || - 4x4 keypad connected to PTB8,9,10,11 and PTE2,3,4,5 */ #include "mbed.h" #include "Hotboards_keypad.h" // Defines the keys array with it's respective number of rows & cols, // and with the value of each key char keys[ 4 ][ 4 ] = { { '1' , '2' , '3' , 'A' }, { '4' , '5' , '6' , 'B' }, { '7' , '8' , '9' , 'C' }, { '*' , '0' , '#' , 'D' } }; // Defines the pins connected to the rows DigitalInOut rowPins[ 4 ] = { PTB8 , PTB9 , PTB10 , PTB11 }; // Defines the pins connected to the cols DigitalInOut colPins[ 4 ] = { PTE2 , PTE3 , PTE4 , PTE5 }; // Creates a new keyboard with the values entered before Keypad kpd( makeKeymap( keys ) , rowPins , colPins , 4 , 4 ); // Configures the serial port Serial pc( USBTX , USBRX ); // For this example we will use the Nucleo LED1 on pin PA_5 DigitalOut led1( LED1 ); bool blink = false; bool ledPin_state; // Taking care of some special events. void kpdEvent( KeypadEvent key ) { switch( kpd.getState( ) ) { case PRESSED: if( key == '#' ) { led1 = !led1; ledPin_state = led1; // Remember LED state, lit or unlit. } break; case RELEASED: if( key == '*' ) { led1 = ledPin_state; blink = false; // Restore LED state from before it started blinking. } break; case HOLD: if( key == '*' ) { blink = true; // Blink the LED when holding the * key. } break; } } int main() { led1 = 1; // Turn the LED on. ledPin_state = led1; // Store initial LED state. HIGH when LED is on. kpd.addEventListener( kpdEvent ); // Add an event listener for this keypad while(1) { char key = kpd.getKey( ); if( key ) { pc.printf( "%c" , key ); } if( blink ) { led1 = !led1; // Change the ledPin from Hi2Lo or Lo2Hi wait_ms( 100 ); } } }