Hotboards MX / Mbed 2 deprecated Hotboards_KeyPad_LoopCounter

Demonstrates the effect of debounce time

Dependencies:   Hotboards_keypad mbed

Fork of LoopCounter by Roman Valencia

main.cpp@0:4b3d27b81086, 2016-03-08 (annotated)

Committer:
RomanValenciaP
Date:
Tue Mar 08 20:43:11 2016 +0000
Revision:
0:4b3d27b81086
Child:
1:0f32d584b715
first release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
RomanValenciaP 0:4b3d27b81086 1
RomanValenciaP 0:4b3d27b81086 2 #include "mbed.h"
RomanValenciaP 0:4b3d27b81086 3 #include "Hotboards_keypad.h"
RomanValenciaP 0:4b3d27b81086 4
RomanValenciaP 0:4b3d27b81086 5 // Defines the keys array with it's respective number of rows & cols,
RomanValenciaP 0:4b3d27b81086 6 // and with the value of each key
RomanValenciaP 0:4b3d27b81086 7 char keys[ 4 ][ 4 ] =
RomanValenciaP 0:4b3d27b81086 8 {
RomanValenciaP 0:4b3d27b81086 9 { '1' , '2' , '3' , 'A' },
RomanValenciaP 0:4b3d27b81086 10 { '4' , '5' , '6' , 'B' },
RomanValenciaP 0:4b3d27b81086 11 { '7' , '8' , '9' , 'C' },
RomanValenciaP 0:4b3d27b81086 12 { '*' , '0' , '#' , 'D' }
RomanValenciaP 0:4b3d27b81086 13 };
RomanValenciaP 0:4b3d27b81086 14
RomanValenciaP 0:4b3d27b81086 15 // Defines the pins connected to the rows
RomanValenciaP 0:4b3d27b81086 16 DigitalInOut rowPins[ 4 ] = { PA_6 , PA_7 , PB_6 , PC_7 };
RomanValenciaP 0:4b3d27b81086 17 // Defines the pins connected to the cols
RomanValenciaP 0:4b3d27b81086 18 DigitalInOut colPins[ 4 ] = { PA_8 , PB_10 , PB_4 , PB_5 };
RomanValenciaP 0:4b3d27b81086 19
RomanValenciaP 0:4b3d27b81086 20 // Creates a new keyboard with the values entered before
RomanValenciaP 0:4b3d27b81086 21 Keypad kpd( makeKeymap( keys ) , rowPins , colPins , 4 , 4 );
RomanValenciaP 0:4b3d27b81086 22
RomanValenciaP 0:4b3d27b81086 23 // Configures the serial port
RomanValenciaP 0:4b3d27b81086 24 Serial pc( USBTX , USBRX );
RomanValenciaP 0:4b3d27b81086 25
RomanValenciaP 0:4b3d27b81086 26 //
RomanValenciaP 0:4b3d27b81086 27 int loopCount = 0;
RomanValenciaP 0:4b3d27b81086 28 int timer_t = 0;
RomanValenciaP 0:4b3d27b81086 29
RomanValenciaP 0:4b3d27b81086 30 // Configures a timer
RomanValenciaP 0:4b3d27b81086 31 Timer t;
RomanValenciaP 0:4b3d27b81086 32
RomanValenciaP 0:4b3d27b81086 33 int main()
RomanValenciaP 0:4b3d27b81086 34 {
RomanValenciaP 0:4b3d27b81086 35 // Starts the timer
RomanValenciaP 0:4b3d27b81086 36 t.start( );
RomanValenciaP 0:4b3d27b81086 37 pc.printf( "Press any key: ");
RomanValenciaP 0:4b3d27b81086 38
RomanValenciaP 0:4b3d27b81086 39
RomanValenciaP 0:4b3d27b81086 40 // Try playing with different debounceTime settings to see how it affects
RomanValenciaP 0:4b3d27b81086 41 // the number of times per second your loop will run. The library prevents
RomanValenciaP 0:4b3d27b81086 42 // setting it to anything below 1 millisecond.
RomanValenciaP 0:4b3d27b81086 43 kpd.setDebounceTime ( 100 ); // setDebouncetime( ms );
RomanValenciaP 0:4b3d27b81086 44 while(1)
RomanValenciaP 0:4b3d27b81086 45 {
RomanValenciaP 0:4b3d27b81086 46 // Poll the keypad to look for any activation
RomanValenciaP 0:4b3d27b81086 47 char key = kpd.getKey( );
RomanValenciaP 0:4b3d27b81086 48
RomanValenciaP 0:4b3d27b81086 49 // Reports the number of times through the loop in 1 second. This will give
RomanValenciaP 0:4b3d27b81086 50 // you a relative idea of just how much the debounceTime has changed the
RomanValenciaP 0:4b3d27b81086 51 // speed of your code. If you set a high debounceTime your loopCount will
RomanValenciaP 0:4b3d27b81086 52 // look good but your keypresses will start to feel sluggish.
RomanValenciaP 0:4b3d27b81086 53 if(( t.read_ms( ) - timer_t ) > 1000 )
RomanValenciaP 0:4b3d27b81086 54 {
RomanValenciaP 0:4b3d27b81086 55 pc.printf( "Your loop code ran " );
RomanValenciaP 0:4b3d27b81086 56 pc.printf( "%d" , loopCount );
RomanValenciaP 0:4b3d27b81086 57 pc.printf( " times over the last second" );
RomanValenciaP 0:4b3d27b81086 58 loopCount = 0;
RomanValenciaP 0:4b3d27b81086 59 pc.printf( "\n\r" );
RomanValenciaP 0:4b3d27b81086 60 timer_t = t.read_ms( );
RomanValenciaP 0:4b3d27b81086 61 }
RomanValenciaP 0:4b3d27b81086 62 loopCount ++;
RomanValenciaP 0:4b3d27b81086 63
RomanValenciaP 0:4b3d27b81086 64 // If any key was pressed
RomanValenciaP 0:4b3d27b81086 65 if( key )
RomanValenciaP 0:4b3d27b81086 66 {
RomanValenciaP 0:4b3d27b81086 67 // Display the key pressed on serial port
RomanValenciaP 0:4b3d27b81086 68 pc.printf( "%c" , key );
RomanValenciaP 0:4b3d27b81086 69 }
RomanValenciaP 0:4b3d27b81086 70 }
RomanValenciaP 0:4b3d27b81086 71 }