main.cpp

00001 
00002 #include "mbed.h"
00003 #include "Hotboards_keypad.h"
00004 
00005 // Defines the keys array with it's respective number of rows & cols,
00006 // and with the value of each key
00007 char keys[ 4 ][ 4 ] =
00008 {
00009     { '1' , '2' , '3' , 'A' },
00010     { '4' , '5' , '6' , 'B' },
00011     { '7' , '8' , '9' , 'C' },
00012     { '*' , '0' , '#' , 'D' }
00013 };
00014 
00015 // Defines the pins connected to the rows
00016 DigitalInOut rowPins[ 4 ] = { PA_6 , PA_7 , PB_6 , PC_7 };
00017 // Defines the pins connected to the cols
00018 DigitalInOut colPins[ 4 ] = { PA_8 , PB_10 , PB_4 , PB_5 };
00019 
00020 // Creates a new keyboard with the values entered before
00021 Keypad kpd( makeKeymap( keys ) , rowPins , colPins , 4 , 4 );
00022 
00023 // Configures the serial port
00024 Serial pc( USBTX , USBRX );
00025 
00026 //
00027 int loopCount = 0;
00028 int timer_t = 0;
00029 
00030 // Configures a timer
00031 Timer t;
00032 
00033 int main()
00034 {
00035     // Starts the timer
00036     t.start( );
00037     pc.printf( "Press any key: ");
00038     
00039 
00040     // Try playing with different debounceTime settings to see how it affects
00041     // the number of times per second your loop will run. The library prevents
00042     // setting it to anything below 1 millisecond.
00043     kpd.setDebounceTime ( 100 ); // setDebouncetime( ms );
00044     while(1)
00045     {
00046         // Poll the keypad to look for any activation
00047         char key = kpd.getKey( );
00048         
00049         // Reports the number of times through the loop in 1 second. This will give
00050         // you a relative idea of just how much the debounceTime has changed the
00051         // speed of your code. If you set a high debounceTime your loopCount will
00052         // look good but your keypresses will start to feel sluggish.        
00053         if(( t.read_ms( ) - timer_t ) > 1000 )
00054         {
00055             pc.printf( "Your loop code ran " );
00056             pc.printf( "%d" , loopCount );
00057             pc.printf( " times over the last second" );
00058             loopCount = 0;
00059             pc.printf( "\n\r" );
00060             timer_t = t.read_ms( );
00061         }
00062         loopCount ++;
00063         
00064         // If any key was pressed
00065         if( key )
00066         {
00067             // Display the key pressed on serial port
00068             pc.printf( "%c" , key );
00069         }
00070     }
00071 }