Trung Nguyen
/
FINAL_PROJECT_4180
asdasdasd
Fork of FINAL_PROJECT_4180 by
keypad.h@12:5cb9ffad1ad7, 2016-05-06 (annotated)
- Committer:
- nyengele
- Date:
- Fri May 06 13:10:20 2016 +0000
- Revision:
- 12:5cb9ffad1ad7
fixed magnetic card bug
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
nyengele | 12:5cb9ffad1ad7 | 1 | /** |
nyengele | 12:5cb9ffad1ad7 | 2 | * Driver for Keypad devices |
nyengele | 12:5cb9ffad1ad7 | 3 | * @author Gedeon Nyengele |
nyengele | 12:5cb9ffad1ad7 | 4 | * @version 1.0 |
nyengele | 12:5cb9ffad1ad7 | 5 | * @date 5/7/2015 |
nyengele | 12:5cb9ffad1ad7 | 6 | */ |
nyengele | 12:5cb9ffad1ad7 | 7 | |
nyengele | 12:5cb9ffad1ad7 | 8 | #ifndef KEYPAD_H |
nyengele | 12:5cb9ffad1ad7 | 9 | #define KEYPAD_H |
nyengele | 12:5cb9ffad1ad7 | 10 | #include "mbed.h" |
nyengele | 12:5cb9ffad1ad7 | 11 | |
nyengele | 12:5cb9ffad1ad7 | 12 | template<unsigned char nRows, unsigned char nCols> |
nyengele | 12:5cb9ffad1ad7 | 13 | class Keypad |
nyengele | 12:5cb9ffad1ad7 | 14 | { |
nyengele | 12:5cb9ffad1ad7 | 15 | public: |
nyengele | 12:5cb9ffad1ad7 | 16 | Keypad(char matrix[nRows][nCols], BusInOut* rows, BusInOut* cols); |
nyengele | 12:5cb9ffad1ad7 | 17 | char getKeyChar(); // Get the value of the pressed key |
nyengele | 12:5cb9ffad1ad7 | 18 | char getKeyChar(void (*wait_ms_fn)(int millis)); |
nyengele | 12:5cb9ffad1ad7 | 19 | ~Keypad(){}; |
nyengele | 12:5cb9ffad1ad7 | 20 | enum BTN_STATE { RELEASE, DEBOUNCE_PRESS, PRESSED, DEBOUNCE_RELEASE, DONE }; |
nyengele | 12:5cb9ffad1ad7 | 21 | |
nyengele | 12:5cb9ffad1ad7 | 22 | private: |
nyengele | 12:5cb9ffad1ad7 | 23 | int getKey(); |
nyengele | 12:5cb9ffad1ad7 | 24 | |
nyengele | 12:5cb9ffad1ad7 | 25 | protected: |
nyengele | 12:5cb9ffad1ad7 | 26 | char _matrix[nRows][nCols]; |
nyengele | 12:5cb9ffad1ad7 | 27 | BusInOut* _cols; |
nyengele | 12:5cb9ffad1ad7 | 28 | BusInOut* _rows; |
nyengele | 12:5cb9ffad1ad7 | 29 | }; |
nyengele | 12:5cb9ffad1ad7 | 30 | |
nyengele | 12:5cb9ffad1ad7 | 31 | /** -------------------------------------------------------------------------- |
nyengele | 12:5cb9ffad1ad7 | 32 | * Constructor |
nyengele | 12:5cb9ffad1ad7 | 33 | *---------------------------------------------------------------------------- |
nyengele | 12:5cb9ffad1ad7 | 34 | */ |
nyengele | 12:5cb9ffad1ad7 | 35 | template<unsigned char nRows, unsigned char nCols> |
nyengele | 12:5cb9ffad1ad7 | 36 | Keypad<nRows, nCols>::Keypad(char matrix[nRows][nCols], BusInOut* rows, BusInOut* cols) |
nyengele | 12:5cb9ffad1ad7 | 37 | { |
nyengele | 12:5cb9ffad1ad7 | 38 | |
nyengele | 12:5cb9ffad1ad7 | 39 | // Copy keypad matrix |
nyengele | 12:5cb9ffad1ad7 | 40 | for (int i = 0; i < nRows; i++) { |
nyengele | 12:5cb9ffad1ad7 | 41 | for (int j = 0; j < nCols; j++) { |
nyengele | 12:5cb9ffad1ad7 | 42 | _matrix[i][j] = matrix[i][j]; |
nyengele | 12:5cb9ffad1ad7 | 43 | } |
nyengele | 12:5cb9ffad1ad7 | 44 | } |
nyengele | 12:5cb9ffad1ad7 | 45 | |
nyengele | 12:5cb9ffad1ad7 | 46 | // Create data bus for row pins |
nyengele | 12:5cb9ffad1ad7 | 47 | _rows = rows; |
nyengele | 12:5cb9ffad1ad7 | 48 | |
nyengele | 12:5cb9ffad1ad7 | 49 | // Create data bus for column pins |
nyengele | 12:5cb9ffad1ad7 | 50 | _cols = cols; |
nyengele | 12:5cb9ffad1ad7 | 51 | } |
nyengele | 12:5cb9ffad1ad7 | 52 | |
nyengele | 12:5cb9ffad1ad7 | 53 | template<unsigned char nRows, unsigned char nCols> |
nyengele | 12:5cb9ffad1ad7 | 54 | char Keypad<nRows, nCols>::getKeyChar(void (*wait_ms_fn)(int millis)) { |
nyengele | 12:5cb9ffad1ad7 | 55 | int key; |
nyengele | 12:5cb9ffad1ad7 | 56 | int temp_key = 0; |
nyengele | 12:5cb9ffad1ad7 | 57 | bool done = false; |
nyengele | 12:5cb9ffad1ad7 | 58 | BTN_STATE state = RELEASE; |
nyengele | 12:5cb9ffad1ad7 | 59 | |
nyengele | 12:5cb9ffad1ad7 | 60 | while(!done) { |
nyengele | 12:5cb9ffad1ad7 | 61 | switch(state) { |
nyengele | 12:5cb9ffad1ad7 | 62 | case RELEASE: |
nyengele | 12:5cb9ffad1ad7 | 63 | key = getKey(); |
nyengele | 12:5cb9ffad1ad7 | 64 | if (key < 0) { |
nyengele | 12:5cb9ffad1ad7 | 65 | state = RELEASE; |
nyengele | 12:5cb9ffad1ad7 | 66 | } else { |
nyengele | 12:5cb9ffad1ad7 | 67 | state = DEBOUNCE_PRESS; |
nyengele | 12:5cb9ffad1ad7 | 68 | temp_key = key; |
nyengele | 12:5cb9ffad1ad7 | 69 | } |
nyengele | 12:5cb9ffad1ad7 | 70 | break; |
nyengele | 12:5cb9ffad1ad7 | 71 | |
nyengele | 12:5cb9ffad1ad7 | 72 | case DEBOUNCE_PRESS: |
nyengele | 12:5cb9ffad1ad7 | 73 | if (wait_ms_fn == 0) wait_ms(30); |
nyengele | 12:5cb9ffad1ad7 | 74 | else wait_ms_fn(30); |
nyengele | 12:5cb9ffad1ad7 | 75 | key = getKey(); |
nyengele | 12:5cb9ffad1ad7 | 76 | if (key == temp_key) { |
nyengele | 12:5cb9ffad1ad7 | 77 | state = PRESSED; |
nyengele | 12:5cb9ffad1ad7 | 78 | } else { |
nyengele | 12:5cb9ffad1ad7 | 79 | state = RELEASE; |
nyengele | 12:5cb9ffad1ad7 | 80 | } |
nyengele | 12:5cb9ffad1ad7 | 81 | break; |
nyengele | 12:5cb9ffad1ad7 | 82 | |
nyengele | 12:5cb9ffad1ad7 | 83 | case PRESSED: |
nyengele | 12:5cb9ffad1ad7 | 84 | key = getKey(); |
nyengele | 12:5cb9ffad1ad7 | 85 | if (key == temp_key) { |
nyengele | 12:5cb9ffad1ad7 | 86 | state = PRESSED; |
nyengele | 12:5cb9ffad1ad7 | 87 | } else { |
nyengele | 12:5cb9ffad1ad7 | 88 | state = DEBOUNCE_RELEASE; |
nyengele | 12:5cb9ffad1ad7 | 89 | } |
nyengele | 12:5cb9ffad1ad7 | 90 | break; |
nyengele | 12:5cb9ffad1ad7 | 91 | |
nyengele | 12:5cb9ffad1ad7 | 92 | case DEBOUNCE_RELEASE: |
nyengele | 12:5cb9ffad1ad7 | 93 | if (wait_ms_fn == 0) wait_ms(30); |
nyengele | 12:5cb9ffad1ad7 | 94 | else wait_ms_fn(30); |
nyengele | 12:5cb9ffad1ad7 | 95 | key = getKey(); |
nyengele | 12:5cb9ffad1ad7 | 96 | if (key == temp_key) { |
nyengele | 12:5cb9ffad1ad7 | 97 | state = PRESSED; |
nyengele | 12:5cb9ffad1ad7 | 98 | } else { |
nyengele | 12:5cb9ffad1ad7 | 99 | state = RELEASE; |
nyengele | 12:5cb9ffad1ad7 | 100 | done = true; |
nyengele | 12:5cb9ffad1ad7 | 101 | } |
nyengele | 12:5cb9ffad1ad7 | 102 | } |
nyengele | 12:5cb9ffad1ad7 | 103 | } |
nyengele | 12:5cb9ffad1ad7 | 104 | |
nyengele | 12:5cb9ffad1ad7 | 105 | return (char) temp_key; |
nyengele | 12:5cb9ffad1ad7 | 106 | } |
nyengele | 12:5cb9ffad1ad7 | 107 | |
nyengele | 12:5cb9ffad1ad7 | 108 | /** -------------------------------------------------------------------------- |
nyengele | 12:5cb9ffad1ad7 | 109 | * Get Key Character |
nyengele | 12:5cb9ffad1ad7 | 110 | *---------------------------------------------------------------------------- |
nyengele | 12:5cb9ffad1ad7 | 111 | */ |
nyengele | 12:5cb9ffad1ad7 | 112 | template<unsigned char nRows, unsigned char nCols> |
nyengele | 12:5cb9ffad1ad7 | 113 | char Keypad<nRows, nCols>::getKeyChar() |
nyengele | 12:5cb9ffad1ad7 | 114 | { |
nyengele | 12:5cb9ffad1ad7 | 115 | return getKeyChar(0); |
nyengele | 12:5cb9ffad1ad7 | 116 | } |
nyengele | 12:5cb9ffad1ad7 | 117 | |
nyengele | 12:5cb9ffad1ad7 | 118 | |
nyengele | 12:5cb9ffad1ad7 | 119 | // HELPER FUNCTIONS |
nyengele | 12:5cb9ffad1ad7 | 120 | |
nyengele | 12:5cb9ffad1ad7 | 121 | template<unsigned char nRows, unsigned char nCols> |
nyengele | 12:5cb9ffad1ad7 | 122 | int Keypad<nRows, nCols>::getKey() |
nyengele | 12:5cb9ffad1ad7 | 123 | { |
nyengele | 12:5cb9ffad1ad7 | 124 | int rowVal = (1 << nRows) - 1; |
nyengele | 12:5cb9ffad1ad7 | 125 | int colVal = (1 << nCols) - 1; |
nyengele | 12:5cb9ffad1ad7 | 126 | int row = -1, col = -1; |
nyengele | 12:5cb9ffad1ad7 | 127 | unsigned int temp; |
nyengele | 12:5cb9ffad1ad7 | 128 | |
nyengele | 12:5cb9ffad1ad7 | 129 | // Read rows |
nyengele | 12:5cb9ffad1ad7 | 130 | _cols->output(); |
nyengele | 12:5cb9ffad1ad7 | 131 | _cols->write(0); |
nyengele | 12:5cb9ffad1ad7 | 132 | _rows->input(); |
nyengele | 12:5cb9ffad1ad7 | 133 | _rows->mode(PullUp); |
nyengele | 12:5cb9ffad1ad7 | 134 | wait_us(5); |
nyengele | 12:5cb9ffad1ad7 | 135 | rowVal = _rows->read(); |
nyengele | 12:5cb9ffad1ad7 | 136 | |
nyengele | 12:5cb9ffad1ad7 | 137 | //Read colums |
nyengele | 12:5cb9ffad1ad7 | 138 | _rows->output(); |
nyengele | 12:5cb9ffad1ad7 | 139 | _rows->write(0); |
nyengele | 12:5cb9ffad1ad7 | 140 | _cols->input(); |
nyengele | 12:5cb9ffad1ad7 | 141 | _cols->mode(PullUp); |
nyengele | 12:5cb9ffad1ad7 | 142 | wait_us(5); |
nyengele | 12:5cb9ffad1ad7 | 143 | colVal = _cols->read(); |
nyengele | 12:5cb9ffad1ad7 | 144 | |
nyengele | 12:5cb9ffad1ad7 | 145 | // Signal no key press |
nyengele | 12:5cb9ffad1ad7 | 146 | if (rowVal == ((1 << nRows) - 1) || colVal == ((1 << nCols) - 1) ) |
nyengele | 12:5cb9ffad1ad7 | 147 | return -1; |
nyengele | 12:5cb9ffad1ad7 | 148 | |
nyengele | 12:5cb9ffad1ad7 | 149 | // Find row number |
nyengele | 12:5cb9ffad1ad7 | 150 | temp = rowVal ^ ((1 << nRows) - 1); |
nyengele | 12:5cb9ffad1ad7 | 151 | for (int i = 0; i < nRows; i++) { |
nyengele | 12:5cb9ffad1ad7 | 152 | |
nyengele | 12:5cb9ffad1ad7 | 153 | if ((temp & (1 << i)) > 0) { |
nyengele | 12:5cb9ffad1ad7 | 154 | row = i; |
nyengele | 12:5cb9ffad1ad7 | 155 | break; |
nyengele | 12:5cb9ffad1ad7 | 156 | } |
nyengele | 12:5cb9ffad1ad7 | 157 | } |
nyengele | 12:5cb9ffad1ad7 | 158 | |
nyengele | 12:5cb9ffad1ad7 | 159 | // Find column number |
nyengele | 12:5cb9ffad1ad7 | 160 | temp = colVal ^ ((1 << nCols) - 1); |
nyengele | 12:5cb9ffad1ad7 | 161 | for (int i = 0; i < nCols; i++) { |
nyengele | 12:5cb9ffad1ad7 | 162 | if ((temp & (1 << i)) > 0) { |
nyengele | 12:5cb9ffad1ad7 | 163 | col = i; |
nyengele | 12:5cb9ffad1ad7 | 164 | break; |
nyengele | 12:5cb9ffad1ad7 | 165 | } |
nyengele | 12:5cb9ffad1ad7 | 166 | } |
nyengele | 12:5cb9ffad1ad7 | 167 | |
nyengele | 12:5cb9ffad1ad7 | 168 | if (row == -1 || col == -1) |
nyengele | 12:5cb9ffad1ad7 | 169 | return -1; |
nyengele | 12:5cb9ffad1ad7 | 170 | else { |
nyengele | 12:5cb9ffad1ad7 | 171 | return _matrix[row][col]; |
nyengele | 12:5cb9ffad1ad7 | 172 | } |
nyengele | 12:5cb9ffad1ad7 | 173 | } |
nyengele | 12:5cb9ffad1ad7 | 174 | |
nyengele | 12:5cb9ffad1ad7 | 175 | #endif // KEYPAD_H |