Hotboards MX
Demonstrates the effect of debounce time
Dependencies: Hotboards_keypad mbed
Fork of
LoopCounter
by 
Roman Valencia
Revision 0:4b3d27b81086, committed 2016-03-08
- Comitter:
- RomanValenciaP
- Date:
- Tue Mar 08 20:43:11 2016 +0000
- Child:
- 1:0f32d584b715
- Commit message:
- first release
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Hotboards_keypad.lib Tue Mar 08 20:43:11 2016 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/Hotboards/code/Hotboards_keypad/#e870110f753b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Mar 08 20:43:11 2016 +0000
@@ -0,0 +1,71 @@
+
+#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 );
+
+//
+int loopCount = 0;
+int timer_t = 0;
+
+// Configures a timer
+Timer t;
+
+int main()
+{
+ // Starts the timer
+ t.start( );
+ pc.printf( "Press any key: ");
+
+
+ // Try playing with different debounceTime settings to see how it affects
+ // the number of times per second your loop will run. The library prevents
+ // setting it to anything below 1 millisecond.
+ kpd.setDebounceTime ( 100 ); // setDebouncetime( ms );
+ while(1)
+ {
+ // Poll the keypad to look for any activation
+ char key = kpd.getKey( );
+
+ // Reports the number of times through the loop in 1 second. This will give
+ // you a relative idea of just how much the debounceTime has changed the
+ // speed of your code. If you set a high debounceTime your loopCount will
+ // look good but your keypresses will start to feel sluggish.
+ if(( t.read_ms( ) - timer_t ) > 1000 )
+ {
+ pc.printf( "Your loop code ran " );
+ pc.printf( "%d" , loopCount );
+ pc.printf( " times over the last second" );
+ loopCount = 0;
+ pc.printf( "\n\r" );
+ timer_t = t.read_ms( );
+ }
+ loopCount ++;
+
+ // If any key was pressed
+ if( key )
+ {
+ // Display the key pressed on serial port
+ pc.printf( "%c" , key );
+ }
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Mar 08 20:43:11 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/87f2f5183dfb \ No newline at end of file