Depot Pertamina / keypad

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keypad.cpp@0:372ef8c791a1, 2019-07-05 (annotated)

Committer:
irsanjul
Date:
Fri Jul 05 10:33:24 2019 +0000
Revision:
0:372ef8c791a1
hhhh

Who changed what in which revision?

UserRevisionLine numberNew contents of line
irsanjul 0:372ef8c791a1 1 #include "keypad.h"
irsanjul 0:372ef8c791a1 2
irsanjul 0:372ef8c791a1 3 Keypad::Keypad(PinName row3, PinName row2, PinName row1, PinName row0,
irsanjul 0:372ef8c791a1 4 PinName col3, PinName col2, PinName col1, PinName col0,
irsanjul 0:372ef8c791a1 5 int debounce_ms):
irsanjul 0:372ef8c791a1 6 _row0(row0), _row1(row1), _row2(row2), _row3(row3),
irsanjul 0:372ef8c791a1 7 _cols(col0, col1, col2, col3)
irsanjul 0:372ef8c791a1 8 {
irsanjul 0:372ef8c791a1 9 _debounce = debounce_ms;
irsanjul 0:372ef8c791a1 10 _rows[0] = &_row0;
irsanjul 0:372ef8c791a1 11 _rows[1] = &_row1;
irsanjul 0:372ef8c791a1 12 _rows[2] = &_row2;
irsanjul 0:372ef8c791a1 13 _rows[3] = &_row3;
irsanjul 0:372ef8c791a1 14 for (int r = 0; r < row_count; r++)
irsanjul 0:372ef8c791a1 15 _rows[r]->mode(PullUp);
irsanjul 0:372ef8c791a1 16 _cols.mode(PullDown);
irsanjul 0:372ef8c791a1 17 _cols.output();
irsanjul 0:372ef8c791a1 18 }
irsanjul 0:372ef8c791a1 19
irsanjul 0:372ef8c791a1 20 void Keypad::_setupFallTrigger(void)
irsanjul 0:372ef8c791a1 21 {
irsanjul 0:372ef8c791a1 22 for (int r = 0; r < row_count; r++)
irsanjul 0:372ef8c791a1 23 _rows[r]->fall(this, &Keypad::_callback);
irsanjul 0:372ef8c791a1 24 }
irsanjul 0:372ef8c791a1 25
irsanjul 0:372ef8c791a1 26 void Keypad::Start(void)
irsanjul 0:372ef8c791a1 27 {
irsanjul 0:372ef8c791a1 28 /* make the columns zero so they can pull rows down */
irsanjul 0:372ef8c791a1 29 _cols = 0x00;
irsanjul 0:372ef8c791a1 30 }
irsanjul 0:372ef8c791a1 31
irsanjul 0:372ef8c791a1 32 void Keypad::Stop(void)
irsanjul 0:372ef8c791a1 33 {
irsanjul 0:372ef8c791a1 34 /* make the columns one so they cannot pull any rows down anymore */
irsanjul 0:372ef8c791a1 35 _cols = ~0x00;
irsanjul 0:372ef8c791a1 36 }
irsanjul 0:372ef8c791a1 37
irsanjul 0:372ef8c791a1 38 void Keypad::CallAfterInput(uint32_t (*fptr)(uint32_t index))
irsanjul 0:372ef8c791a1 39 {
irsanjul 0:372ef8c791a1 40 _input.attach(fptr);
irsanjul 0:372ef8c791a1 41 _setupFallTrigger();
irsanjul 0:372ef8c791a1 42 }
irsanjul 0:372ef8c791a1 43
irsanjul 0:372ef8c791a1 44 int Keypad::DebouncedScan()
irsanjul 0:372ef8c791a1 45 {
irsanjul 0:372ef8c791a1 46 /* debounce */
irsanjul 0:372ef8c791a1 47 wait_ms(_debounce);
irsanjul 0:372ef8c791a1 48
irsanjul 0:372ef8c791a1 49 return Scan();
irsanjul 0:372ef8c791a1 50 }
irsanjul 0:372ef8c791a1 51
irsanjul 0:372ef8c791a1 52 int Keypad::Scan()
irsanjul 0:372ef8c791a1 53 {
irsanjul 0:372ef8c791a1 54 /* lookup row */
irsanjul 0:372ef8c791a1 55 int r = -1;
irsanjul 0:372ef8c791a1 56 for (r = 0; r < row_count; r++) {
irsanjul 0:372ef8c791a1 57 if (*_rows[r] == 0)
irsanjul 0:372ef8c791a1 58 break;
irsanjul 0:372ef8c791a1 59 }
irsanjul 0:372ef8c791a1 60
irsanjul 0:372ef8c791a1 61 /* if we didn't find a valid row, return */
irsanjul 0:372ef8c791a1 62 if (!(0 <= r && r < row_count))
irsanjul 0:372ef8c791a1 63 return -1;
irsanjul 0:372ef8c791a1 64
irsanjul 0:372ef8c791a1 65 /* scan columns to find out which one pulls down the row */
irsanjul 0:372ef8c791a1 66 int c = -1;
irsanjul 0:372ef8c791a1 67 for (c = 0; c < col_count; c++) {
irsanjul 0:372ef8c791a1 68 _cols = ~(1 << c);
irsanjul 0:372ef8c791a1 69 if (*_rows[r] == 0)
irsanjul 0:372ef8c791a1 70 break;
irsanjul 0:372ef8c791a1 71 }
irsanjul 0:372ef8c791a1 72
irsanjul 0:372ef8c791a1 73 /* re-energize all columns */
irsanjul 0:372ef8c791a1 74 Start();
irsanjul 0:372ef8c791a1 75
irsanjul 0:372ef8c791a1 76 /* if we didn't find a valid column, return */
irsanjul 0:372ef8c791a1 77 if (!(0 <= c && c < col_count))
irsanjul 0:372ef8c791a1 78 return -1;
irsanjul 0:372ef8c791a1 79
irsanjul 0:372ef8c791a1 80 return r * col_count + c;
irsanjul 0:372ef8c791a1 81 }
irsanjul 0:372ef8c791a1 82
irsanjul 0:372ef8c791a1 83 int Keypad::DebouncedScanMultiple()
irsanjul 0:372ef8c791a1 84 {
irsanjul 0:372ef8c791a1 85 /* debounce */
irsanjul 0:372ef8c791a1 86 wait_ms(_debounce);
irsanjul 0:372ef8c791a1 87
irsanjul 0:372ef8c791a1 88 return ScanMultiple();
irsanjul 0:372ef8c791a1 89 }
irsanjul 0:372ef8c791a1 90
irsanjul 0:372ef8c791a1 91 int Keypad::ScanMultiple()
irsanjul 0:372ef8c791a1 92 {
irsanjul 0:372ef8c791a1 93 int res = 0;
irsanjul 0:372ef8c791a1 94 for (int c = 0; c < col_count; c++) {
irsanjul 0:372ef8c791a1 95 _cols = ~(1 << c);
irsanjul 0:372ef8c791a1 96 for (int r = 0; r < row_count; r++) {
irsanjul 0:372ef8c791a1 97 if (*_rows[r] == 0) {
irsanjul 0:372ef8c791a1 98 res |= 1 << (r * col_count + c);
irsanjul 0:372ef8c791a1 99 }
irsanjul 0:372ef8c791a1 100 }
irsanjul 0:372ef8c791a1 101 }
irsanjul 0:372ef8c791a1 102
irsanjul 0:372ef8c791a1 103 return res;
irsanjul 0:372ef8c791a1 104 }
irsanjul 0:372ef8c791a1 105
irsanjul 0:372ef8c791a1 106 void Keypad::_callback()
irsanjul 0:372ef8c791a1 107 {
irsanjul 0:372ef8c791a1 108 /* lookup */
irsanjul 0:372ef8c791a1 109 int position = DebouncedScan();
irsanjul 0:372ef8c791a1 110
irsanjul 0:372ef8c791a1 111 /* call back a valid position */
irsanjul 0:372ef8c791a1 112 if (position >= 0)
irsanjul 0:372ef8c791a1 113 _input.call(position);
irsanjul 0:372ef8c791a1 114 }
irsanjul 0:372ef8c791a1 115