lib/keypad/Keypad.cpp

Mon, 11 Mar 2024 15:35:36 +0100

author
David Douard <david.douard@sdf3.org>
date
Mon, 11 Mar 2024 15:35:36 +0100
changeset 71
d193c24a078a
parent 66
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permissions
-rw-r--r--

Add links to sr.ht repos and add an image in the README file

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1 #include "mbed.h"
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2 #include "Keypad.h"
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3
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4
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5 Keypad::Keypad(
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6 uint8_t nRows,
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7 DigitalIn rows[],
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8 uint8_t nColumns,
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9 DigitalOut cols[],
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10 int debounce_ms):
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11 _rows(),
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12 _columns(),
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13 _debounce(debounce_ms),
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14 _started(false),
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15 _nrows(nRows),
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16 _ncols(nColumns)
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17 {
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18 printf("Setup Keypad: %dx%d\r\n", nColumns, nRows);
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19 for(uint8_t c=0; c<nColumns; c++)
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20 {
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21 _columns.push_back(cols[c]);
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22 _columns[c].write(0);
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23 }
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24
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25 for(uint8_t r=0; r<nRows; r++)
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26 {
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27 _rows.push_back(rows[r]);
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28 _rows[r].mode(PullDown);
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29 }
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30 _keys = new uint8_t[_nrows*_ncols];
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31 }
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32
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33 Keypad::~Keypad()
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34 {
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35 delete _keys;
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36 }
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37
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38 void Keypad::run()
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39 {
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40 uint8_t col=0;
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41 uint8_t row;
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42
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43 for (row=0; row<(_ncols*_nrows); row++)
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44 _keys[row] = 0;
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45
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46 while(_started)
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47 {
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48 // activate column col
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49 _columns[col].write(1);
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50 ThisThread::sleep_for(5ms);
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51 for(row=0; row<_nrows; row++)
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52 {
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53 if (_rows[row].read())
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54 {
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55 if (_keys[row + _nrows*col] < 2) // ensure only one key is pressed in this column
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56 {
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57 _keys[row + _nrows*col]++;
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58 if ((_keys[row + _nrows*col] == 2) && _kp_callback)
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59 _kp_callback.call(row, col);
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60 }
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61 }
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62 else
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63 {
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64 if (_keys[row + _nrows*col] > 0)
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65 {
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66 _keys[row + _nrows*col]--;
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67 if ((_keys[row + _nrows*col] == 0) && _kr_callback)
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68 _kr_callback.call(row, col);
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69 }
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70 }
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71 }
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72 _columns[col].write(0);
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73 col = (col+1) % _ncols;
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74 ThisThread::sleep_for(5ms);
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75 }
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76 }
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77
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78 void Keypad::attach(const keyevent_callback_t& kp_callback,
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79 const keyevent_callback_t& kr_callback)
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80 {
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81 _kp_callback = kp_callback;
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82 _kr_callback = kr_callback;
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83 }
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84
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85 void Keypad::start(void)
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86 {
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87 if (_started)
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88 return;
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89 _started = true;
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90 _loop.start(callback(this, &Keypad::run));
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91 }
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92
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93 void Keypad::stop(void)
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94 {
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95 _started = false;
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96 }

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