keyboards/ergo42/matrix.c

   1 /*
   2 Copyright 2012 Jun Wako <wakojun@gmail.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 #if (DIODE_DIRECTION == COL2ROW)
 123     unselect_rows();
 124     init_cols();
 125 #elif (DIODE_DIRECTION == ROW2COL)
 126     unselect_cols();
 127     init_rows();
 128 #endif
 129
 130     TX_RX_LED_INIT;
 131
 132     // initialize matrix state: all keys off
 133     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 134         matrix[i] = 0;
 135         matrix_debouncing[i] = 0;
 136     }
 137
 138     matrix_init_quantum();
 139
 140 }
 141
 142 uint8_t _matrix_scan(void)
 143 {
 144     int offset = isLeftHand ? 0 : (ROWS_PER_HAND);
 145 #if (DIODE_DIRECTION == COL2ROW)
 146     // Set row, read cols
 147     for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
 148 #       if (DEBOUNCING_DELAY > 0)
 149             bool matrix_changed = read_cols_on_row(matrix_debouncing+offset, current_row);
 150
 151             if (matrix_changed) {
 152                 debouncing = true;
 153                 debouncing_time = timer_read();
 154                 PORTD ^= (1 << 2);
 155             }
 156
 157 #       else
 158             read_cols_on_row(matrix+offset, current_row);
 159 #       endif
 160
 161     }
 162
 163 #elif (DIODE_DIRECTION == ROW2COL)
 164     // Set col, read rows
 165     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
 166 #       if (DEBOUNCING_DELAY > 0)
 167             bool matrix_changed = read_rows_on_col(matrix_debouncing+offset, current_col);
 168             if (matrix_changed) {
 169                 debouncing = true;
 170                 debouncing_time = timer_read();
 171             }
 172 #       else
 173              read_rows_on_col(matrix+offset, current_col);
 174 #       endif
 175
 176     }
 177 #endif
 178
 179 #   if (DEBOUNCING_DELAY > 0)
 180         if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
 181             for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
 182                 matrix[i+offset] = matrix_debouncing[i+offset];
 183             }
 184             debouncing = false;
 185         }
 186 #   endif
 187
 188     return 1;
 189 }
 190
 191 #ifdef USE_I2C
 192
 193 // Get rows from other half over i2c
 194 int i2c_transaction(void) {
 195     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 196
 197     int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
 198     if (err) goto i2c_error;
 199
 200     // start of matrix stored at 0x00
 201     err = i2c_master_write(0x00);
 202     if (err) goto i2c_error;
 203
 204     // Start read
 205     err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
 206     if (err) goto i2c_error;
 207
 208     if (!err) {
 209         int i;
 210         for (i = 0; i < ROWS_PER_HAND-1; ++i) {
 211             matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
 212         }
 213         matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
 214         i2c_master_stop();
 215     } else {
 216 i2c_error: // the cable is disconnceted, or something else went wrong
 217         i2c_reset_state();
 218         return err;
 219     }
 220
 221     return 0;
 222 }
 223
 224 #else // USE_SERIAL
 225
 226 int serial_transaction(void) {
 227     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 228
 229     if (serial_update_buffers()) {
 230         return 1;
 231     }
 232
 233     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 234         matrix[slaveOffset+i] = serial_slave_buffer[i];
 235     }
 236     return 0;
 237 }
 238 #endif
 239
 240 uint8_t matrix_scan(void)
 241 {
 242     uint8_t ret = _matrix_scan();
 243
 244 #ifdef USE_I2C
 245     if( i2c_transaction() ) {
 246 #else // USE_SERIAL
 247     if( serial_transaction() ) {
 248 #endif
 249         // turn on the indicator led when halves are disconnected
 250         TXLED1;
 251
 252         error_count++;
 253
 254         if (error_count > ERROR_DISCONNECT_COUNT) {
 255             // reset other half if disconnected
 256             int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 257             for (int i = 0; i < ROWS_PER_HAND; ++i) {
 258                 matrix[slaveOffset+i] = 0;
 259             }
 260         }
 261     } else {
 262         // turn off the indicator led on no error
 263         TXLED0;
 264         error_count = 0;
 265     }
 266     matrix_scan_quantum();
 267     return ret;
 268 }
 269
 270 void matrix_slave_scan(void) {
 271     _matrix_scan();
 272
 273     int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
 274
 275 #ifdef USE_I2C
 276     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 277         i2c_slave_buffer[i] = matrix[offset+i];
 278     }
 279 #else // USE_SERIAL
 280     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 281         serial_slave_buffer[i] = matrix[offset+i];
 282     }
 283 #endif
 284 }
 285
 286 bool matrix_is_modified(void)
 287 {
 288     if (debouncing) return false;
 289     return true;
 290 }
 291
 292 inline
 293 bool matrix_is_on(uint8_t row, uint8_t col)
 294 {
 295     return (matrix[row] & ((matrix_row_t)1<<col));
 296 }
 297
 298 inline
 299 matrix_row_t matrix_get_row(uint8_t row)
 300 {
 301     return matrix[row];
 302 }
 303
 304 void matrix_print(void)
 305 {
 306     print("\nr/c 0123456789ABCDEF\n");
 307     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 308         phex(row); print(": ");
 309         pbin_reverse16(matrix_get_row(row));
 310         print("\n");
 311     }
 312 }
 313
 314 uint8_t matrix_key_count(void)
 315 {
 316     uint8_t count = 0;
 317     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 318         count += bitpop16(matrix[i]);
 319     }
 320     return count;
 321 }
 322
 323 #if (DIODE_DIRECTION == COL2ROW)
 324
 325 static void init_cols(void)
 326 {
 327     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 328         uint8_t pin = col_pins[x];
 329         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 330         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 331     }
 332 }
 333
 334 static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 335 {
 336     // Store last value of row prior to reading
 337     matrix_row_t last_row_value = current_matrix[current_row];
 338
 339     // Clear data in matrix row
 340     current_matrix[current_row] = 0;
 341
 342     // Select row and wait for row selecton to stabilize
 343     select_row(current_row);
 344     wait_us(30);
 345
 346     // For each col...
 347     for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
 348
 349         // Select the col pin to read (active low)
 350         uint8_t pin = col_pins[col_index];
 351         uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
 352
 353         // Populate the matrix row with the state of the col pin
 354         current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << col_index);
 355     }
 356
 357     // Unselect row
 358     unselect_row(current_row);
 359
 360     return (last_row_value != current_matrix[current_row]);
 361 }
 362
 363 static void select_row(uint8_t row)
 364 {
 365     uint8_t pin = row_pins[row];
 366     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 367     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 368 }
 369
 370 static void unselect_row(uint8_t row)
 371 {
 372     uint8_t pin = row_pins[row];
 373     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 374     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 375 }
 376
 377 static void unselect_rows(void)
 378 {
 379     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 380         uint8_t pin = row_pins[x];
 381         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 382         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 383     }
 384 }
 385
 386 #elif (DIODE_DIRECTION == ROW2COL)
 387
 388 static void init_rows(void)
 389 {
 390     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 391         uint8_t pin = row_pins[x];
 392         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 393         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 394     }
 395 }
 396
 397 static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 398 {
 399     bool matrix_changed = false;
 400
 401     // Select col and wait for col selecton to stabilize
 402     select_col(current_col);
 403     wait_us(30);
 404
 405     // For each row...
 406     for(uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++)
 407     {
 408
 409         // Store last value of row prior to reading
 410         matrix_row_t last_row_value = current_matrix[row_index];
 411
 412         // Check row pin state
 413         if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0)
 414         {
 415             // Pin LO, set col bit
 416             current_matrix[row_index] |= (ROW_SHIFTER << current_col);
 417         }
 418         else
 419         {
 420             // Pin HI, clear col bit
 421             current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
 422         }
 423
 424         // Determine if the matrix changed state
 425         if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
 426         {
 427             matrix_changed = true;
 428         }
 429     }
 430
 431     // Unselect col
 432     unselect_col(current_col);
 433
 434     return matrix_changed;
 435 }
 436
 437 static void select_col(uint8_t col)
 438 {
 439     uint8_t pin = col_pins[col];
 440     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 441     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 442 }
 443
 444 static void unselect_col(uint8_t col)
 445 {
 446     uint8_t pin = col_pins[col];
 447     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 448     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 449 }
 450
 451 static void unselect_cols(void)
 452 {
 453     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 454         uint8_t pin = col_pins[x];
 455         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 456         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 457     }
 458 }
 459
 460 #endif