keyboards/deltasplit75/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     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             }
 150
 151 #       else
 152             read_cols_on_row(matrix+offset, current_row);
 153 #       endif
 154
 155     }
 156
 157 #elif (DIODE_DIRECTION == ROW2COL)
 158     // Set col, read rows
 159     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
 160 #       if (DEBOUNCING_DELAY > 0)
 161             bool matrix_changed = read_rows_on_col(matrix_debouncing+offset, current_col);
 162             if (matrix_changed) {
 163                 debouncing = true;
 164                 debouncing_time = timer_read();
 165             }
 166 #       else
 167              read_rows_on_col(matrix+offset, current_col);
 168 #       endif
 169
 170     }
 171 #endif
 172
 173 #   if (DEBOUNCING_DELAY > 0)
 174         if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
 175             for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
 176                 matrix[i+offset] = matrix_debouncing[i+offset];
 177             }
 178             debouncing = false;
 179         }
 180 #   endif
 181
 182     return 1;
 183 }
 184
 185 #ifdef USE_I2C
 186
 187 // Get rows from other half over i2c
 188 int i2c_transaction(void) {
 189     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 190
 191     int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
 192     if (err) goto i2c_error;
 193
 194     // start of matrix stored at 0x00
 195     err = i2c_master_write(0x00);
 196     if (err) goto i2c_error;
 197
 198     // Start read
 199     err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
 200     if (err) goto i2c_error;
 201
 202     if (!err) {
 203         int i;
 204         for (i = 0; i < ROWS_PER_HAND-1; ++i) {
 205             matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
 206         }
 207         matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
 208         i2c_master_stop();
 209     } else {
 210 i2c_error: // the cable is disconnceted, or something else went wrong
 211         i2c_reset_state();
 212         return err;
 213     }
 214
 215     return 0;
 216 }
 217
 218 #else // USE_SERIAL
 219
 220 int serial_transaction(void) {
 221     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 222
 223     if (serial_update_buffers()) {
 224         return 1;
 225     }
 226
 227     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 228         matrix[slaveOffset+i] = serial_slave_buffer[i];
 229     }
 230     return 0;
 231 }
 232 #endif
 233
 234 uint8_t matrix_scan(void)
 235 {
 236     uint8_t ret = _matrix_scan();
 237
 238 #ifdef USE_I2C
 239     if( i2c_transaction() ) {
 240 #else // USE_SERIAL
 241     if( serial_transaction() ) {
 242 #endif
 243         // turn on the indicator led when halves are disconnected
 244         TXLED1;
 245
 246         error_count++;
 247
 248         if (error_count > ERROR_DISCONNECT_COUNT) {
 249             // reset other half if disconnected
 250             int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 251             for (int i = 0; i < ROWS_PER_HAND; ++i) {
 252                 matrix[slaveOffset+i] = 0;
 253             }
 254         }
 255     } else {
 256         // turn off the indicator led on no error
 257         TXLED0;
 258         error_count = 0;
 259     }
 260     matrix_scan_quantum();
 261     return ret;
 262 }
 263
 264 void matrix_slave_scan(void) {
 265     _matrix_scan();
 266
 267     int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
 268
 269 #ifdef USE_I2C
 270     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 271         i2c_slave_buffer[i] = matrix[offset+i];
 272     }
 273 #else // USE_SERIAL
 274     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 275         serial_slave_buffer[i] = matrix[offset+i];
 276     }
 277 #endif
 278 }
 279
 280 bool matrix_is_modified(void)
 281 {
 282     if (debouncing) return false;
 283     return true;
 284 }
 285
 286 inline
 287 bool matrix_is_on(uint8_t row, uint8_t col)
 288 {
 289     return (matrix[row] & ((matrix_row_t)1<<col));
 290 }
 291
 292 inline
 293 matrix_row_t matrix_get_row(uint8_t row)
 294 {
 295     return matrix[row];
 296 }
 297
 298 void matrix_print(void)
 299 {
 300     print("\nr/c 0123456789ABCDEF\n");
 301     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 302         phex(row); print(": ");
 303         pbin_reverse16(matrix_get_row(row));
 304         print("\n");
 305     }
 306 }
 307
 308 uint8_t matrix_key_count(void)
 309 {
 310     uint8_t count = 0;
 311     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 312         count += bitpop16(matrix[i]);
 313     }
 314     return count;
 315 }
 316
 317 #if (DIODE_DIRECTION == COL2ROW)
 318
 319 static void init_cols(void)
 320 {
 321     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 322         uint8_t pin = col_pins[x];
 323         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 324         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 325     }
 326 }
 327
 328 static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 329 {
 330     // Store last value of row prior to reading
 331     matrix_row_t last_row_value = current_matrix[current_row];
 332
 333     // Clear data in matrix row
 334     current_matrix[current_row] = 0;
 335
 336     // Select row and wait for row selecton to stabilize
 337     select_row(current_row);
 338     wait_us(30);
 339
 340     // For each col...
 341     for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
 342
 343         // Select the col pin to read (active low)
 344         uint8_t pin = col_pins[col_index];
 345         uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
 346
 347         // Populate the matrix row with the state of the col pin
 348         current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << col_index);
 349     }
 350
 351     // Unselect row
 352     unselect_row(current_row);
 353
 354     return (last_row_value != current_matrix[current_row]);
 355 }
 356
 357 static void select_row(uint8_t row)
 358 {
 359     uint8_t pin = row_pins[row];
 360     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 361     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 362 }
 363
 364 static void unselect_row(uint8_t row)
 365 {
 366     uint8_t pin = row_pins[row];
 367     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 368     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 369 }
 370
 371 static void unselect_rows(void)
 372 {
 373     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 374         uint8_t pin = row_pins[x];
 375         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 376         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 377     }
 378 }
 379
 380 #elif (DIODE_DIRECTION == ROW2COL)
 381
 382 static void init_rows(void)
 383 {
 384     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 385         uint8_t pin = row_pins[x];
 386         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 387         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 388     }
 389 }
 390
 391 static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 392 {
 393     bool matrix_changed = false;
 394
 395     // Select col and wait for col selecton to stabilize
 396     select_col(current_col);
 397     wait_us(30);
 398
 399     // For each row...
 400     for(uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++)
 401     {
 402
 403         // Store last value of row prior to reading
 404         matrix_row_t last_row_value = current_matrix[row_index];
 405
 406         // Check row pin state
 407         if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0)
 408         {
 409             // Pin LO, set col bit
 410             current_matrix[row_index] |= (ROW_SHIFTER << current_col);
 411         }
 412         else
 413         {
 414             // Pin HI, clear col bit
 415             current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
 416         }
 417
 418         // Determine if the matrix changed state
 419         if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
 420         {
 421             matrix_changed = true;
 422         }
 423     }
 424
 425     // Unselect col
 426     unselect_col(current_col);
 427
 428     return matrix_changed;
 429 }
 430
 431 static void select_col(uint8_t col)
 432 {
 433     uint8_t pin = col_pins[col];
 434     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 435     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 436 }
 437
 438 static void unselect_col(uint8_t col)
 439 {
 440     uint8_t pin = col_pins[col];
 441     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 442     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 443 }
 444
 445 static void unselect_cols(void)
 446 {
 447     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 448         uint8_t pin = col_pins[x];
 449         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 450         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 451     }
 452 }
 453
 454 #endif