Keyboard firmwares for Atmel AVR and Cortex-M
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matrix.c 5.0KB

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  1. /*
  2. Copyright 2012 Jun Wako <wakojun@gmail.com>
  3. This program is free software: you can redistribute it and/or modify
  4. it under the terms of the GNU General Public License as published by
  5. the Free Software Foundation, either version 2 of the License, or
  6. (at your option) any later version.
  7. This program is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  10. GNU General Public License for more details.
  11. You should have received a copy of the GNU General Public License
  12. along with this program. If not, see <http://www.gnu.org/licenses/>.
  13. */
  14. /*
  15. * scan matrix
  16. */
  17. #include <stdint.h>
  18. #include <stdbool.h>
  19. #include <avr/io.h>
  20. #include <util/delay.h>
  21. #include "print.h"
  22. #include "debug.h"
  23. #include "util.h"
  24. #include "matrix.h"
  25. #ifndef DEBOUNCE
  26. # define DEBOUNCE 5
  27. #endif
  28. static uint8_t debouncing = DEBOUNCE;
  29. /* matrix state(1:on, 0:off) */
  30. static matrix_row_t matrix[MATRIX_ROWS];
  31. static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  32. static matrix_row_t read_cols(void);
  33. static void init_cols(void);
  34. static void unselect_rows(void);
  35. static void select_row(uint8_t row);
  36. inline
  37. uint8_t matrix_rows(void)
  38. {
  39. return MATRIX_ROWS;
  40. }
  41. inline
  42. uint8_t matrix_cols(void)
  43. {
  44. return MATRIX_COLS;
  45. }
  46. void matrix_init(void)
  47. {
  48. // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
  49. MCUCR |= (1<<JTD);
  50. MCUCR |= (1<<JTD);
  51. // initialize row and col
  52. unselect_rows();
  53. init_cols();
  54. // initialize matrix state: all keys off
  55. for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  56. matrix[i] = 0;
  57. matrix_debouncing[i] = 0;
  58. }
  59. }
  60. uint8_t matrix_scan(void)
  61. {
  62. for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  63. select_row(i);
  64. _delay_us(30); // without this wait read unstable value.
  65. matrix_row_t cols = read_cols();
  66. if (matrix_debouncing[i] != cols) {
  67. matrix_debouncing[i] = cols;
  68. if (debouncing) {
  69. debug("bounce!: "); debug_hex(debouncing); debug("\n");
  70. }
  71. debouncing = DEBOUNCE;
  72. }
  73. unselect_rows();
  74. }
  75. if (debouncing) {
  76. if (--debouncing) {
  77. _delay_ms(1);
  78. } else {
  79. for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  80. matrix[i] = matrix_debouncing[i];
  81. }
  82. }
  83. }
  84. return 1;
  85. }
  86. bool matrix_is_modified(void)
  87. {
  88. if (debouncing) return false;
  89. return true;
  90. }
  91. inline
  92. bool matrix_is_on(uint8_t row, uint8_t col)
  93. {
  94. return (matrix[row] & ((matrix_row_t)1<<col));
  95. }
  96. inline
  97. matrix_row_t matrix_get_row(uint8_t row)
  98. {
  99. return matrix[row];
  100. }
  101. void matrix_print(void)
  102. {
  103. print("\nr/c 0123456789ABCDEF\n");
  104. for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  105. phex(row); print(": ");
  106. pbin_reverse16(matrix_get_row(row));
  107. print("\n");
  108. }
  109. }
  110. uint8_t matrix_key_count(void)
  111. {
  112. uint8_t count = 0;
  113. for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  114. count += bitpop16(matrix[i]);
  115. }
  116. return count;
  117. }
  118. /* Column pin configuration
  119. * col: 0 1 2 3 4 5 6 7
  120. * pin: B6 B2 B3 B1 F7 F6 F5 F4
  121. */
  122. static void init_cols(void)
  123. {
  124. // Input with pull-up(DDR:0, PORT:1)
  125. DDRF &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7);
  126. PORTF |= (1<<4 | 1<<5 | 1<<6 | 1<<7);
  127. DDRB &= ~(1<<1 | 1<<2 | 1<<3 | 1<<6);
  128. PORTB |= (1<<1 | 1<<2 | 1<<3 | 1<<6);
  129. }
  130. static matrix_row_t read_cols(void)
  131. {
  132. return (PINB&(1<<6) ? 0 : (1<<0)) |
  133. (PINB&(1<<2) ? 0 : (1<<1)) |
  134. (PINB&(1<<3) ? 0 : (1<<2)) |
  135. (PINB&(1<<1) ? 0 : (1<<3)) |
  136. (PINF&(1<<7) ? 0 : (1<<4)) |
  137. (PINF&(1<<6) ? 0 : (1<<5)) |
  138. (PINF&(1<<5) ? 0 : (1<<6)) |
  139. (PINF&(1<<4) ? 0 : (1<<7)) ;
  140. }
  141. /* Row pin configuration
  142. * row: 0 1 2 3 4 5
  143. * pin: B5 B4 E6 D7 C6 D4
  144. */
  145. static void unselect_rows(void)
  146. {
  147. // Hi-Z(DDR:0, PORT:0) to unselect
  148. DDRB &= ~0b00110000;
  149. PORTB &= ~0b00110000;
  150. DDRC &= ~0b01000000;
  151. PORTC &= ~0b01000000;
  152. DDRD &= ~0b10010000;
  153. PORTD &= ~0b10010000;
  154. DDRE &= ~0b01000000;
  155. PORTE &= ~0b01000000;
  156. }
  157. static void select_row(uint8_t row)
  158. {
  159. // Output low(DDR:1, PORT:0) to select
  160. switch (row) {
  161. case 0:
  162. DDRB |= (1<<5);
  163. PORTB &= ~(1<<5);
  164. break;
  165. case 1:
  166. DDRB |= (1<<4);
  167. PORTB &= ~(1<<4);
  168. break;
  169. case 2:
  170. DDRE |= (1<<6);
  171. PORTE &= ~(1<<6);
  172. break;
  173. case 3:
  174. DDRD |= (1<<7);
  175. PORTD &= ~(1<<7);
  176. break;
  177. case 4:
  178. DDRC |= (1<<6);
  179. PORTC &= ~(1<<6);
  180. break;
  181. case 5:
  182. DDRD |= (1<<4);
  183. PORTD &= ~(1<<4);
  184. break;
  185. }
  186. }