Keyboard firmwares for Atmel AVR and Cortex-M
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matrix.c 4.7KB

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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. #include "protocol/serial.h"
  26. #ifndef DEBOUNCE
  27. # define DEBOUNCE 5
  28. #endif
  29. static uint8_t debouncing = DEBOUNCE;
  30. /* matrix state(1:on, 0:off) */
  31. static matrix_row_t matrix[MATRIX_ROWS];
  32. static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  33. static matrix_row_t read_cols(void);
  34. static void init_cols(void);
  35. static void unselect_rows(void);
  36. static void select_row(uint8_t row);
  37. inline
  38. uint8_t matrix_rows(void)
  39. {
  40. return MATRIX_ROWS;
  41. }
  42. inline
  43. uint8_t matrix_cols(void)
  44. {
  45. return MATRIX_COLS;
  46. }
  47. void matrix_init(void)
  48. {
  49. // initialize row and col
  50. unselect_rows();
  51. init_cols();
  52. // initialize matrix state: all keys off
  53. for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  54. matrix[i] = 0;
  55. matrix_debouncing[i] = 0;
  56. }
  57. serial_init();
  58. }
  59. uint8_t matrix_scan(void)
  60. {
  61. for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  62. select_row(i);
  63. _delay_us(30); // without this wait read unstable value.
  64. matrix_row_t cols = read_cols();
  65. if (matrix_debouncing[i] != cols) {
  66. matrix_debouncing[i] = cols;
  67. if (debouncing) {
  68. debug("bounce!: "); debug_hex(debouncing); debug("\n");
  69. }
  70. debouncing = DEBOUNCE;
  71. }
  72. unselect_rows();
  73. }
  74. if (debouncing) {
  75. if (--debouncing) {
  76. _delay_ms(1);
  77. } else {
  78. for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  79. matrix[i] = matrix_debouncing[i];
  80. }
  81. }
  82. }
  83. return 1;
  84. }
  85. bool matrix_is_modified(void)
  86. {
  87. if (debouncing) return false;
  88. return true;
  89. }
  90. inline
  91. bool matrix_is_on(uint8_t row, uint8_t col)
  92. {
  93. return (matrix[row] & ((matrix_row_t)1<<col));
  94. }
  95. inline
  96. matrix_row_t matrix_get_row(uint8_t row)
  97. {
  98. return matrix[row];
  99. }
  100. void matrix_print(void)
  101. {
  102. print("\nr/c 0123456789ABCDEF\n");
  103. for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
  104. phex(row); print(": ");
  105. pbin_reverse16(matrix_get_row(row));
  106. print("\n");
  107. }
  108. }
  109. uint8_t matrix_key_count(void)
  110. {
  111. uint8_t count = 0;
  112. for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  113. count += bitpop16(matrix[i]);
  114. }
  115. return count;
  116. }
  117. /* Column pin configuration
  118. * col: 0 1 2 3 4 5 6 7 8 9 10 11
  119. * pin: D7 E6 B4 B5 B6 B2 B3 B1 F7 F6 F5 F4
  120. */
  121. static void init_cols(void)
  122. {
  123. // Input with pull-up(DDR:0, PORT:1)
  124. DDRF &= ~(1<<4 | 1<<5 | 1<<6 | 1<<7);
  125. PORTF |= (1<<4 | 1<<5 | 1<<6 | 1<<7);
  126. DDRE &= ~(1<<6);
  127. PORTE |= (1<<6);
  128. DDRD &= ~(1<<7);
  129. PORTD |= (1<<7);
  130. DDRB &= ~(1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 | 1<<6);
  131. PORTB |= (1<<1 | 1<<2 | 1<<3 | 1<<4 | 1<<5 | 1<<6);
  132. }
  133. static matrix_row_t read_cols(void)
  134. {
  135. return (PIND&(1<<7) ? 0 : (1<<0)) |
  136. (PINE&(1<<6) ? 0 : (1<<1)) |
  137. (PINB&(1<<4) ? 0 : (1<<2)) |
  138. (PINB&(1<<5) ? 0 : (1<<3)) |
  139. (PINB&(1<<6) ? 0 : (1<<4)) |
  140. (PINB&(1<<2) ? 0 : (1<<5)) |
  141. (PINB&(1<<3) ? 0 : (1<<6)) |
  142. (PINB&(1<<1) ? 0 : (1<<7)) |
  143. (PINF&(1<<7) ? 0 : (1<<8)) |
  144. (PINF&(1<<6) ? 0 : (1<<9)) |
  145. (PINF&(1<<5) ? 0 : (1<<10)) |
  146. (PINF&(1<<4) ? 0 : (1<<11));
  147. }
  148. /* Row pin configuration
  149. * row: 0 1 2 3
  150. * pin: D1 D0 D4 C6
  151. */
  152. static void unselect_rows(void)
  153. {
  154. // Hi-Z(DDR:0, PORT:0) to unselect
  155. DDRD &= ~0b00010011;
  156. PORTD &= ~0b00010011;
  157. DDRC &= ~0b01000000;
  158. PORTC &= ~0b01000000;
  159. }
  160. static void select_row(uint8_t row)
  161. {
  162. // Output low(DDR:1, PORT:0) to select
  163. switch (row) {
  164. case 0:
  165. DDRD |= (1<<1);
  166. PORTD &= ~(1<<1);
  167. break;
  168. case 1:
  169. DDRD |= (1<<0);
  170. PORTD &= ~(1<<0);
  171. break;
  172. case 2:
  173. DDRD |= (1<<4);
  174. PORTD &= ~(1<<4);
  175. break;
  176. case 3:
  177. DDRC |= (1<<6);
  178. PORTC &= ~(1<<6);
  179. break;
  180. }
  181. }