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:
- 16:ea3c612999ac
- Parent:
- 15:78f9c379a2e1
- Child:
- 17:f9b292067464
--- a/keypad.h Sat Sep 19 18:35:49 2015 +0000 +++ b/keypad.h Sat Sep 19 18:45:01 2015 +0000 @@ -33,6 +33,8 @@ const char NO_KEY = '\0'; #define KEY_RELEASED NO_KEY +/** @brief table showing the printed layout of the keypad \n + */ const char keys[16] = {'1','2','3','A', '4','5','6','B', '7','8','9','C', @@ -96,10 +98,10 @@ Keypad(PinName col0, PinName col1, PinName col2, PinName col3, PinName row0,PinName row1, PinName row2, PinName row3); /** @brief Returns the letter of the pressed key \n - * if no walid key was pressed\n - * the value -1 is returned\n * - * @return char - The pressed character or -1 if no char was pressed + * @return char + * @retval -1 Error: no keys was pressed + * @retval The pressed character */ char getKey(); @@ -124,7 +126,8 @@ * if no walid key was pressed \n * the value -1 is returned * - * @return int - The index + * @return int + * @retval The index representing the pushed key used in table keys */ int getKeyIndex();