keyboards/viterbi/matrix.c

   1 /*
   2 Copyright 2017 Danny Nguyen <danny@hexwire.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 /*
  19  * scan matrix
  20  */
  21 #include <stdint.h>
  22 #include <stdbool.h>
  23 #include <avr/io.h>
  24 #include "wait.h"
  25 #include "print.h"
  26 #include "debug.h"
  27 #include "util.h"
  28 #include "matrix.h"
  29 #include "split_util.h"
  30 #include "pro_micro.h"
  31 #include "config.h"
  32 #include "timer.h"
  33
  34 #ifdef USE_I2C
  35 #  include "i2c.h"
  36 #else // USE_SERIAL
  37 #  include "serial.h"
  38 #endif
  39
  40 #ifndef DEBOUNCING_DELAY
  41 #   define DEBOUNCING_DELAY 5
  42 #endif
  43
  44 #if (DEBOUNCING_DELAY > 0)
  45     static uint16_t debouncing_time;
  46     static bool debouncing = false;
  47 #endif
  48
  49 #if (MATRIX_COLS <= 8)
  50 #    define print_matrix_header()  print("\nr/c 01234567\n")
  51 #    define print_matrix_row(row)  print_bin_reverse8(matrix_get_row(row))
  52 #    define matrix_bitpop(i)       bitpop(matrix[i])
  53 #    define ROW_SHIFTER ((uint8_t)1)
  54 #else
  55 #    error "Currently only supports 8 COLS"
  56 #endif
  57 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  58
  59 #define ERROR_DISCONNECT_COUNT 5
  60
  61 #define ROWS_PER_HAND (MATRIX_ROWS/2)
  62
  63 static uint8_t error_count = 0;
  64
  65 static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
  66 static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
  67
  68 /* matrix state(1:on, 0:off) */
  69 static matrix_row_t matrix[MATRIX_ROWS];
  70 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  71
  72 #if (DIODE_DIRECTION == COL2ROW)
  73     static void init_cols(void);
  74     static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
  75     static void unselect_rows(void);
  76     static void select_row(uint8_t row);
  77     static void unselect_row(uint8_t row);
  78 #elif (DIODE_DIRECTION == ROW2COL)
  79     static void init_rows(void);
  80     static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
  81     static void unselect_cols(void);
  82     static void unselect_col(uint8_t col);
  83     static void select_col(uint8_t col);
  84 #endif
  85
  86 __attribute__ ((weak))
  87 void matrix_init_kb(void) {
  88     matrix_init_user();
  89 }
  90
  91 __attribute__ ((weak))
  92 void matrix_scan_kb(void) {
  93     matrix_scan_user();
  94 }
  95
  96 __attribute__ ((weak))
  97 void matrix_init_user(void) {
  98 }
  99
 100 __attribute__ ((weak))
 101 void matrix_scan_user(void) {
 102 }
 103
 104 inline
 105 uint8_t matrix_rows(void)
 106 {
 107     return MATRIX_ROWS;
 108 }
 109
 110 inline
 111 uint8_t matrix_cols(void)
 112 {
 113     return MATRIX_COLS;
 114 }
 115
 116 void matrix_init(void)
 117 {
 118     debug_enable = true;
 119     debug_matrix = true;
 120     debug_mouse = true;
 121     // initialize row and col
 122     unselect_rows();
 123     init_cols();
 124
 125     TX_RX_LED_INIT;
 126
 127     // initialize matrix state: all keys off
 128     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 129         matrix[i] = 0;
 130         matrix_debouncing[i] = 0;
 131     }
 132
 133     matrix_init_quantum();
 134
 135 }
 136
 137 uint8_t _matrix_scan(void)
 138 {
 139     int offset = isLeftHand ? 0 : (ROWS_PER_HAND);
 140 #if (DIODE_DIRECTION == COL2ROW)
 141     // Set row, read cols
 142     for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
 143 #       if (DEBOUNCING_DELAY > 0)
 144             bool matrix_changed = read_cols_on_row(matrix_debouncing+offset, current_row);
 145
 146             if (matrix_changed) {
 147                 debouncing = true;
 148                 debouncing_time = timer_read();
 149                 PORTD ^= (1 << 2);
 150             }
 151
 152 #       else
 153             read_cols_on_row(matrix+offset, current_row);
 154 #       endif
 155
 156     }
 157
 158 #elif (DIODE_DIRECTION == ROW2COL)
 159     // Set col, read rows
 160     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
 161 #       if (DEBOUNCING_DELAY > 0)
 162             bool matrix_changed = read_rows_on_col(matrix_debouncing+offset, current_col);
 163             if (matrix_changed) {
 164                 debouncing = true;
 165                 debouncing_time = timer_read();
 166             }
 167 #       else
 168              read_rows_on_col(matrix+offset, current_col);
 169 #       endif
 170
 171     }
 172 #endif
 173
 174 #   if (DEBOUNCING_DELAY > 0)
 175         if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
 176             for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
 177                 matrix[i+offset] = matrix_debouncing[i+offset];
 178             }
 179             debouncing = false;
 180         }
 181 #   endif
 182
 183     return 1;
 184 }
 185
 186 #ifdef USE_I2C
 187
 188 // Get rows from other half over i2c
 189 int i2c_transaction(void) {
 190     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 191
 192     int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
 193     if (err) goto i2c_error;
 194
 195     // start of matrix stored at 0x00
 196     err = i2c_master_write(0x00);
 197     if (err) goto i2c_error;
 198
 199     // Start read
 200     err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
 201     if (err) goto i2c_error;
 202
 203     if (!err) {
 204         int i;
 205         for (i = 0; i < ROWS_PER_HAND-1; ++i) {
 206             matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
 207         }
 208         matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
 209         i2c_master_stop();
 210     } else {
 211 i2c_error: // the cable is disconnceted, or something else went wrong
 212         i2c_reset_state();
 213         return err;
 214     }
 215
 216     return 0;
 217 }
 218
 219 #else // USE_SERIAL
 220
 221 int serial_transaction(void) {
 222     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 223
 224     if (serial_update_buffers()) {
 225         return 1;
 226     }
 227
 228     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 229         matrix[slaveOffset+i] = serial_slave_buffer[i];
 230     }
 231     return 0;
 232 }
 233 #endif
 234
 235 uint8_t matrix_scan(void)
 236 {
 237     uint8_t ret = _matrix_scan();
 238
 239 #ifdef USE_I2C
 240     if( i2c_transaction() ) {
 241 #else // USE_SERIAL
 242     if( serial_transaction() ) {
 243 #endif
 244         // turn on the indicator led when halves are disconnected
 245         TXLED1;
 246
 247         error_count++;
 248
 249         if (error_count > ERROR_DISCONNECT_COUNT) {
 250             // reset other half if disconnected
 251             int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 252             for (int i = 0; i < ROWS_PER_HAND; ++i) {
 253                 matrix[slaveOffset+i] = 0;
 254             }
 255         }
 256     } else {
 257         // turn off the indicator led on no error
 258         TXLED0;
 259         error_count = 0;
 260     }
 261     matrix_scan_quantum();
 262     return ret;
 263 }
 264
 265 void matrix_slave_scan(void) {
 266     _matrix_scan();
 267
 268     int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
 269
 270 #ifdef USE_I2C
 271     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 272         i2c_slave_buffer[i] = matrix[offset+i];
 273     }
 274 #else // USE_SERIAL
 275     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 276         serial_slave_buffer[i] = matrix[offset+i];
 277     }
 278 #endif
 279 }
 280
 281 bool matrix_is_modified(void)
 282 {
 283     if (debouncing) return false;
 284     return true;
 285 }
 286
 287 inline
 288 bool matrix_is_on(uint8_t row, uint8_t col)
 289 {
 290     return (matrix[row] & ((matrix_row_t)1<<col));
 291 }
 292
 293 inline
 294 matrix_row_t matrix_get_row(uint8_t row)
 295 {
 296     return matrix[row];
 297 }
 298
 299 void matrix_print(void)
 300 {
 301     print("\nr/c 0123456789ABCDEF\n");
 302     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 303         phex(row); print(": ");
 304         pbin_reverse16(matrix_get_row(row));
 305         print("\n");
 306     }
 307 }
 308
 309 uint8_t matrix_key_count(void)
 310 {
 311     uint8_t count = 0;
 312     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 313         count += bitpop16(matrix[i]);
 314     }
 315     return count;
 316 }
 317
 318 #if (DIODE_DIRECTION == COL2ROW)
 319
 320 static void init_cols(void)
 321 {
 322     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 323         uint8_t pin = col_pins[x];
 324         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 325         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 326     }
 327 }
 328
 329 static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 330 {
 331     // Store last value of row prior to reading
 332     matrix_row_t last_row_value = current_matrix[current_row];
 333
 334     // Clear data in matrix row
 335     current_matrix[current_row] = 0;
 336
 337     // Select row and wait for row selecton to stabilize
 338     select_row(current_row);
 339     wait_us(30);
 340
 341     // For each col...
 342     for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
 343
 344         // Select the col pin to read (active low)
 345         uint8_t pin = col_pins[col_index];
 346         uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
 347
 348         // Populate the matrix row with the state of the col pin
 349         current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << col_index);
 350     }
 351
 352     // Unselect row
 353     unselect_row(current_row);
 354
 355     return (last_row_value != current_matrix[current_row]);
 356 }
 357
 358 static void select_row(uint8_t row)
 359 {
 360     uint8_t pin = row_pins[row];
 361     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 362     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 363 }
 364
 365 static void unselect_row(uint8_t row)
 366 {
 367     uint8_t pin = row_pins[row];
 368     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 369     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 370 }
 371
 372 static void unselect_rows(void)
 373 {
 374     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 375         uint8_t pin = row_pins[x];
 376         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 377         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 378     }
 379 }
 380
 381 #elif (DIODE_DIRECTION == ROW2COL)
 382
 383 static void init_rows(void)
 384 {
 385     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 386         uint8_t pin = row_pins[x];
 387         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 388         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 389     }
 390 }
 391
 392 static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 393 {
 394     bool matrix_changed = false;
 395
 396     // Select col and wait for col selecton to stabilize
 397     select_col(current_col);
 398     wait_us(30);
 399
 400     // For each row...
 401     for(uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++)
 402     {
 403
 404         // Store last value of row prior to reading
 405         matrix_row_t last_row_value = current_matrix[row_index];
 406
 407         // Check row pin state
 408         if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0)
 409         {
 410             // Pin LO, set col bit
 411             current_matrix[row_index] |= (ROW_SHIFTER << current_col);
 412         }
 413         else
 414         {
 415             // Pin HI, clear col bit
 416             current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
 417         }
 418
 419         // Determine if the matrix changed state
 420         if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
 421         {
 422             matrix_changed = true;
 423         }
 424     }
 425
 426     // Unselect col
 427     unselect_col(current_col);
 428
 429     return matrix_changed;
 430 }
 431
 432 static void select_col(uint8_t col)
 433 {
 434     uint8_t pin = col_pins[col];
 435     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 436     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 437 }
 438
 439 static void unselect_col(uint8_t col)
 440 {
 441     uint8_t pin = col_pins[col];
 442     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 443     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 444 }
 445
 446 static void unselect_cols(void)
 447 {
 448     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 449         uint8_t pin = col_pins[x];
 450         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 451         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 452     }
 453 }
 454
 455 #endif