Gert Jan Schoneveld
Tests forked Keypad library.
Dependencies: FPointer keypad mbed
Schematic:
No extra hardware is needed besides the wires and switches. The columns are outputs configured with open drain. The rows are inputs configured with pull up resistors. A key press pulls down its row. With scanning the column is determined thereafter.
See keypad for the forked library used in this project.
Revision 3:fb173f712440, committed 2012-11-04
- Comitter:
- gj_schoneveld
- Date:
- Sun Nov 04 09:50:00 2012 +0000
- Parent:
- 2:eaa3d23e9b29
- Child:
- 4:16191e501b63
- Commit message:
- Multiple keys added
Changed in this revision
| keypad.lib | Show annotated file Show diff for this revision Revisions of this file |
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/keypad.lib Sat Nov 03 23:45:20 2012 +0000 +++ b/keypad.lib Sun Nov 04 09:50:00 2012 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/gj_schoneveld/code/keypad/#e6623f165199 +http://mbed.org/users/gj_schoneveld/code/keypad/#fb6929fac0db
--- a/main.cpp Sat Nov 03 23:45:20 2012 +0000
+++ b/main.cpp Sun Nov 04 09:50:00 2012 +0000
@@ -18,6 +18,19 @@
return 0;
}
+uint32_t cbAfterMultipleInput(uint32_t key)
+{
+ for (int i = 0; i < 16; i++) {
+ if (key & (1 << i)) {
+ printf("Key: %d => \'%c\'\t", i, Keytable[i]);
+ }
+ }
+ printf("\n");
+ code = key;
+
+ return 0;
+}
+
void Sleep(void)
{
__WFI();
@@ -30,22 +43,31 @@
Keypad keypad(p25, p26, p27, p28, p21, p22, p23, p24);
// interrupt mode
+/*
keypad.CallAfterInput(&cbAfterInput);
keypad.Start();
while (1) {
Sleep();
}
+*/
// polling mode
/*
keypad.Start();
-
- int key = -1;
while (1) {
- key = keypad.DebouncedScan();
+ int key = keypad.DebouncedScan();
if (key >= 0)
cbAfterInput(key);
wait(0.1);
}
*/
+
+// poll multiple mode
+ keypad.Start();
+ while (1) {
+ key = keypad.DebouncedScanMultiple();
+ if (key > 0)
+ cbAfterMultipleInput(key);
+ wait(0.1);
+ }
}
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