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:
- RomanValenciaP
- Date:
- 2016-03-08
- Revision:
- 0:a2b95a8cb722
- Child:
- 1:88d227ecb9b3
File content as of revision 0:a2b95a8cb722:
#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 ] = { PA_6 , PA_7 , PB_6 , PC_7 }; // Defines the pins connected to the cols DigitalInOut colPins[ 4 ] = { PA_8 , PB_10 , PB_4 , PB_5 }; // 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 ); } } }