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 |
|
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
. |
|
char | getKey () |
Returns the letter of the pressed key
. |
|
bool | getKeyPressed () |
Detects if any key was pressed.
|
|
void | enablePullUp () |
Enables internal PullUp resistors on the coloums pins.
|
|
Protected Member Functions |
|
int | getKeyIndex () |
return the index value representating the pressed key
|
Diff: keypad.h
- Revision:
- 8:862b0a362754
- Parent:
- 7:51ed72b695a5
- Child:
- 9:1f7793af2f64
diff -r 51ed72b695a5 -r 862b0a362754 keypad.h --- a/keypad.h Sat Sep 19 09:17:07 2015 +0000 +++ b/keypad.h Sat Sep 19 16:28:14 2015 +0000 @@ -77,49 +77,50 @@ class Keypad{ public: - /** Create a 4x4 (col, row) or 4x4 keypad interface\n - *\n - *@table + /** @brief Create a 4x4 (col, row) or 4x4 keypad interface\n + * \n + * @table * | 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 - *@endtabl + * @endtable * * @param col<0..3> Row data lines * @param row<0..3> Column data lines */ 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 - * the value -1 is returned + /** @brief Returns the letter of the pressed key \n + * if no walid key was pressed\n + * the value -1 is returned\n * - * returns char + * @return char - The pressed character or -1 if no char was pressed */ char getKey(); - /** User-defined function that returns true if any key is pressed + /** @brief Detects if any key was pressed * - * returns bool + * @return bool - true is returned if any key is pressed */ bool getKeyPressed(); - /** User-defined function enables PullUp resistors on the + /** Enables internal PullUp resistors on the coloums pins * - * returns bool + * @return void */ void enablePullUp(); protected: BusIn _cols; BusOut _rows; - /** User-defined function that return the index value - * representating the pressed key if no walid key was pressed - * the value 0 is returned + /** @brief return the index value \n + * representating the pressed key \n + * if no walid key was pressed \n + * the value -1 is returned * - * returns int + * @return int */ int getKeyIndex();