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:
- 18:a973524a445d
- Parent:
- 17:f9b292067464
- Child:
- 19:0a2ec1b8bd5b
--- a/keypad.h Sat Sep 19 18:50:53 2015 +0000 +++ b/keypad.h Sat Sep 19 19:45:57 2015 +0000 @@ -100,8 +100,9 @@ /** @brief Returns the letter of the pressed key \n * * @return char - * @retval -1 Error: no keys was pressed - * @retval >=0 The pressed character + * @returns + * The pressed character + * -1 if no keys was pressed */ char getKey(); @@ -123,11 +124,11 @@ BusOut _rows; /** @brief return the index value \n * representating the pressed key \n - * * @return int - * @retval -1 no key was pressed - * @retval >=0 The index representing the pushed key used in table keys + * @returns + * The index representing the pushed key used in table keys + * -1 if no key was pressed */ int getKeyIndex();