Rune Langoy
4x4 Keypad easy to use library that pollis the interface width pullups
Dependents: 4x4KeyBoardExample xoxokey 4x4KeyBoardExample ProgettoCassaforte ... more
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) | |
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Create a 4x4 (col, row) or 4x4 keypad interface
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| char | getKey () |
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Returns the letter of the pressed key
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| bool | getKeyPressed () |
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Detects if any key was pressed.
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| void | enablePullUp () |
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Enables internal PullUp resistors on the coloums pins.
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Protected Member Functions |
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| int | getKeyIndex () |
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return the index value representating the pressed key
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Revision 21:fb28bc08ded4, committed 2015-09-20
- Comitter:
- rlanghbv
- Date:
- Sun Sep 20 06:00:00 2015 +0000
- Parent:
- 20:064b86485f26
- Commit message:
- doc update
Changed in this revision
| keypad.h | Show annotated file Show diff for this revision Revisions of this file |
diff -r 064b86485f26 -r fb28bc08ded4 keypad.h
--- a/keypad.h Sun Sep 20 05:56:16 2015 +0000
+++ b/keypad.h Sun Sep 20 06:00:00 2015 +0000
@@ -102,7 +102,7 @@
* @return char
* @returns
* The pressed character\n
- * -1 if no keys was pressed
+ * '\0' or NO_KEY if no keys was pressed
*/
char getKey();