4x4 Keypad easy to use library that pollis the interface width pullups
Dependents: 4x4KeyBoardExample xoxokey 4x4KeyBoardExample ProgettoCassaforte ... more
Fork of keypad by
Simple library for reading a 4x4 keypad width at ability to use internal pullups
Import program
00001 #include "mbed.h" 00002 #include "keypad.h" 00003 00004 Serial pc(USBTX, USBRX); 00005 00006 00007 int main() { 00008 // c0 c1 c2 c3 r0 r1 r2 r3 00009 Keypad keypad( PC_3,PC_2,PA_0,PA_1,PA_4,PB_0,PC_1,PC_0 ); 00010 00011 keypad.enablePullUp(); 00012 char key; 00013 pc.printf("Please touch a key on the keypad\n\r"); 00014 while (1) 00015 { 00016 key = keypad.getKey(); 00017 if(key != KEY_RELEASED) 00018 { 00019 pc.printf("%c\r\n",key); 00020 wait(0.6); 00021 } 00022 } 00023 }
Import library
Public Member Functions |
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Keypad (PinName col0, PinName col1, PinName col2, PinName col3, PinName row0, PinName row1, PinName row2, PinName row3) | |
Create a 4x4 (col, row) or 4x4 keypad interface
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char | getKey () |
Returns the letter of the pressed key
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bool | getKeyPressed () |
Detects if any key was pressed.
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void | enablePullUp () |
Enables internal PullUp resistors on the coloums pins.
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Protected Member Functions |
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int | getKeyIndex () |
return the index value representating the pressed key
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Diff: keypad.h
- Revision:
- 3:d3772b2d763c
- Parent:
- 2:cf9e1e315e74
- Child:
- 4:7e46f22dc3ad
--- a/keypad.h Sat Sep 19 07:58:53 2015 +0000 +++ b/keypad.h Sat Sep 19 09:00:03 2015 +0000 @@ -77,19 +77,19 @@ class Keypad{ public: - /** Create a 4x4 (col, row) or 4x4 keypad interface: - * - * | Col0 | Col1 | Col2 | Col3 - * -------+------+------+------+----- - * Row 0 | x | x | x | x - * Row 1 | x | x | x | x - * Row 2 | x | x | x | x - * Row 3 | x | x | x | x - * + /** Create a 4x4 (col, row) or 4x4 keypad interface:\n + *\n + * | Col0 | Col1 | Col2 | Col3 \n + * -------+------+------+------+----- \n + * Row 0 | x | x | x | x \n + * Row 1 | x | x | x | x \n + * Row 2 | x | x | x | x \n + * Row 3 | x | x | x | x \n + * \n * @param col<0..3> Row data lines * @param row<0..3> Column data lines */ - Keypad(PinName col1, PinName col2, PinName col3, PinName col4, PinName row1,PinName row2, PinName row3, PinName row4); + Keypad(PinName col0, PinName col1, PinName col2, PinName col3, PinName row0,PinName row1, PinName row2, PinName row3); /** User-defined function that returns the letter of the pressed key * if no walid key was pressed