Mercurial > hp34970-firmware / annotate
lib/keypad/Keypad.cpp@c1dfd75f2842 (annotated)
lib/keypad/Keypad.cpp
Mon, 23 Nov 2020 21:57:06 +0100
- author
- David Douard <david.douard@sdf3.org>
- date
- Mon, 23 Nov 2020 21:57:06 +0100
- changeset 58
- c1dfd75f2842
- parent 33
- 167010858b8d
- child 66
- 48f29a1d43d6
- permissions
- -rw-r--r--
Do not go to the next line if the char to display does not fit
| 33 | 1 | #include "mbed.h" |
| 2 | #include "Keypad.h" | |
| 3 | ||
| 4 | ||
| 5 | Keypad::Keypad( | |
| 6 | uint8_t nRows, | |
| 7 | DigitalIn rows[], | |
| 8 | uint8_t nColumns, | |
| 9 | DigitalOut cols[], | |
| 10 | int debounce_ms): | |
| 11 | _rows(), | |
| 12 | _columns(), | |
| 13 | _debounce(debounce_ms), | |
| 14 | _started(false), | |
| 15 | _nrows(nRows), | |
| 16 | _ncols(nColumns) | |
| 17 | { | |
| 18 | printf("Setup Keypad: %dx%d\r\n", nColumns, nRows); | |
| 19 | for(uint8_t c=0; c<nColumns; c++) | |
| 20 | { | |
| 21 | _columns.push_back(cols[c]); | |
| 22 | _columns[c].write(0); | |
| 23 | } | |
| 24 | ||
| 25 | for(uint8_t r=0; r<nRows; r++) | |
| 26 | { | |
| 27 | _rows.push_back(rows[r]); | |
| 28 | _rows[r].mode(PullDown); | |
| 29 | } | |
| 30 | _keys = new uint8_t[_nrows*_ncols]; | |
| 31 | } | |
| 32 | ||
| 33 | Keypad::~Keypad() | |
| 34 | { | |
| 35 | delete _keys; | |
| 36 | } | |
| 37 | ||
| 38 | void Keypad::run() | |
| 39 | { | |
| 40 | uint8_t col=0; | |
| 41 | uint8_t row; | |
| 42 | ||
| 43 | for (row=0; row<(_ncols*_nrows); row++) | |
| 44 | _keys[row] = 0; | |
| 45 | ||
| 46 | while(_started) | |
| 47 | { | |
| 48 | // activate column col | |
| 49 | _columns[col].write(1); | |
| 50 | ThisThread::sleep_for(5); | |
| 51 | for(row=0; row<_nrows; row++) | |
| 52 | { | |
| 53 | if (_rows[row].read()) | |
| 54 | { | |
| 55 | if (_keys[row + _nrows*col] < 2) // ensure only one key is pressed in this column | |
| 56 | { | |
| 57 | _keys[row + _nrows*col]++; | |
| 58 | if ((_keys[row + _nrows*col] == 2) && _kp_callback) | |
| 59 | _kp_callback.call(row, col); | |
| 60 | } | |
| 61 | } | |
| 62 | else | |
| 63 | { | |
| 64 | if (_keys[row + _nrows*col] > 0) | |
| 65 | { | |
| 66 | _keys[row + _nrows*col]--; | |
| 67 | if ((_keys[row + _nrows*col] == 0) && _kr_callback) | |
| 68 | _kr_callback.call(row, col); | |
| 69 | } | |
| 70 | } | |
| 71 | } | |
| 72 | _columns[col].write(0); | |
| 73 | col = (col+1) % _ncols; | |
| 74 | ThisThread::sleep_for(5); | |
| 75 | } | |
| 76 | } | |
| 77 | ||
| 78 | void Keypad::attach(const keyevent_callback_t& kp_callback, | |
| 79 | const keyevent_callback_t& kr_callback) | |
| 80 | { | |
| 81 | _kp_callback = kp_callback; | |
| 82 | _kr_callback = kr_callback; | |
| 83 | } | |
| 84 | ||
| 85 | void Keypad::start(void) | |
| 86 | { | |
| 87 | if (_started) | |
| 88 | return; | |
| 89 | _started = true; | |
| 90 | _loop.start(callback(this, &Keypad::run)); | |
| 91 | } | |
| 92 | ||
| 93 | void Keypad::stop(void) | |
| 94 | { | |
| 95 | _started = false; | |
| 96 | } |
