keyboards/zen/matrix.c

   1 /*
   2 Copyright 2017 Danny Nguyen <danny@keeb.io>
   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 #include "backlight.h"
  34
  35 #ifdef USE_I2C
  36 #  include "i2c.h"
  37 #else // USE_SERIAL
  38 #  include "serial.h"
  39 #endif
  40
  41 #ifndef DEBOUNCING_DELAY
  42 #   define DEBOUNCING_DELAY 5
  43 #endif
  44
  45 #if (DEBOUNCING_DELAY > 0)
  46     static uint16_t debouncing_time;
  47     static bool debouncing = false;
  48 #endif
  49
  50 #if (MATRIX_COLS <= 8)
  51 #    define print_matrix_header()  print("\nr/c 01234567\n")
  52 #    define print_matrix_row(row)  print_bin_reverse8(matrix_get_row(row))
  53 #    define matrix_bitpop(i)       bitpop(matrix[i])
  54 #    define ROW_SHIFTER ((uint8_t)1)
  55 #else
  56 #    error "Currently only supports 8 COLS"
  57 #endif
  58 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  59
  60 #define ERROR_DISCONNECT_COUNT 5
  61
  62 #define SERIAL_LED_ADDR 0x00
  63
  64 #define ROWS_PER_HAND (MATRIX_ROWS/2)
  65
  66 static uint8_t error_count = 0;
  67
  68 static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
  69 static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
  70
  71 /* matrix state(1:on, 0:off) */
  72 static matrix_row_t matrix[MATRIX_ROWS];
  73 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  74
  75 #if (DIODE_DIRECTION == COL2ROW)
  76     static void init_cols(void);
  77     static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
  78     static void unselect_rows(void);
  79     static void select_row(uint8_t row);
  80     static void unselect_row(uint8_t row);
  81 #elif (DIODE_DIRECTION == ROW2COL)
  82     static void init_rows(void);
  83     static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
  84     static void unselect_cols(void);
  85     static void unselect_col(uint8_t col);
  86     static void select_col(uint8_t col);
  87 #endif
  88
  89 __attribute__ ((weak))
  90 void matrix_init_kb(void) {
  91     matrix_init_user();
  92 }
  93
  94 __attribute__ ((weak))
  95 void matrix_scan_kb(void) {
  96     matrix_scan_user();
  97 }
  98
  99 __attribute__ ((weak))
 100 void matrix_init_user(void) {
 101 }
 102
 103 __attribute__ ((weak))
 104 void matrix_scan_user(void) {
 105 }
 106
 107 inline
 108 uint8_t matrix_rows(void)
 109 {
 110     return MATRIX_ROWS;
 111 }
 112
 113 inline
 114 uint8_t matrix_cols(void)
 115 {
 116     return MATRIX_COLS;
 117 }
 118
 119 void matrix_init(void)
 120 {
 121     debug_enable = true;
 122     debug_matrix = true;
 123     debug_mouse = true;
 124     // initialize row and col
 125     unselect_rows();
 126     init_cols();
 127
 128     TX_RX_LED_INIT;
 129
 130     // initialize matrix state: all keys off
 131     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
 132         matrix[i] = 0;
 133         matrix_debouncing[i] = 0;
 134     }
 135
 136
 137 }
 138
 139 uint8_t _matrix_scan(void)
 140 {
 141     int offset = isLeftHand ? 0 : (ROWS_PER_HAND);
 142 #if (DIODE_DIRECTION == COL2ROW)
 143     // Set row, read cols
 144     for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
 145 #       if (DEBOUNCING_DELAY > 0)
 146             bool matrix_changed = read_cols_on_row(matrix_debouncing+offset, current_row);
 147
 148             if (matrix_changed) {
 149                 debouncing = true;
 150                 debouncing_time = timer_read();
 151                 PORTD ^= (1 << 2);
 152             }
 153
 154 #       else
 155             read_cols_on_row(matrix+offset, current_row);
 156 #       endif
 157
 158     }
 159
 160 #elif (DIODE_DIRECTION == ROW2COL)
 161     // Set col, read rows
 162     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
 163 #       if (DEBOUNCING_DELAY > 0)
 164             bool matrix_changed = read_rows_on_col(matrix_debouncing+offset, current_col);
 165             if (matrix_changed) {
 166                 debouncing = true;
 167                 debouncing_time = timer_read();
 168             }
 169 #       else
 170              read_rows_on_col(matrix+offset, current_col);
 171 #       endif
 172
 173     }
 174 #endif
 175
 176 #   if (DEBOUNCING_DELAY > 0)
 177         if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
 178             for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
 179                 matrix[i+offset] = matrix_debouncing[i+offset];
 180             }
 181             debouncing = false;
 182         }
 183 #   endif
 184
 185     return 1;
 186 }
 187
 188 #ifdef USE_I2C
 189
 190 // Get rows from other half over i2c
 191 int i2c_transaction(void) {
 192     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 193
 194     int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
 195     if (err) goto i2c_error;
 196
 197     // start of matrix stored at 0x00
 198     err = i2c_master_write(0x00);
 199     if (err) goto i2c_error;
 200
 201     // Start read
 202     err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
 203     if (err) goto i2c_error;
 204
 205     if (!err) {
 206         int i;
 207         for (i = 0; i < ROWS_PER_HAND-1; ++i) {
 208             matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
 209         }
 210         matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
 211         i2c_master_stop();
 212     } else {
 213 i2c_error: // the cable is disconnceted, or something else went wrong
 214         i2c_reset_state();
 215         return err;
 216     }
 217
 218     return 0;
 219 }
 220
 221 #else // USE_SERIAL
 222
 223 int serial_transaction(void) {
 224     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 225
 226     if (serial_update_buffers()) {
 227         return 1;
 228     }
 229
 230     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 231         matrix[slaveOffset+i] = serial_slave_buffer[i];
 232     }
 233
 234 #ifdef BACKLIGHT_ENABLE
 235     // Write backlight level for slave to read
 236     serial_master_buffer[SERIAL_LED_ADDR] = get_backlight_level();
 237 #endif
 238     return 0;
 239 }
 240 #endif
 241
 242 uint8_t matrix_scan(void)
 243 {
 244     uint8_t ret = _matrix_scan();
 245
 246 #ifdef USE_I2C
 247     if( i2c_transaction() ) {
 248 #else // USE_SERIAL
 249     if( serial_transaction() ) {
 250 #endif
 251         // turn on the indicator led when halves are disconnected
 252         TXLED1;
 253
 254         error_count++;
 255
 256         if (error_count > ERROR_DISCONNECT_COUNT) {
 257             // reset other half if disconnected
 258             int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 259             for (int i = 0; i < ROWS_PER_HAND; ++i) {
 260                 matrix[slaveOffset+i] = 0;
 261             }
 262         }
 263     } else {
 264         // turn off the indicator led on no error
 265         TXLED0;
 266         error_count = 0;
 267     }
 268     return ret;
 269 }
 270
 271 void matrix_slave_scan(void) {
 272     _matrix_scan();
 273
 274     int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
 275
 276 #ifdef USE_I2C
 277     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 278         i2c_slave_buffer[i] = matrix[offset+i];
 279     }
 280 #else // USE_SERIAL
 281     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 282         serial_slave_buffer[i] = matrix[offset+i];
 283     }
 284
 285 #ifdef BACKLIGHT_ENABLE
 286     // Read backlight level sent from master and update level on slave
 287     backlight_set(serial_master_buffer[SERIAL_LED_ADDR]);
 288 #endif
 289 #endif
 290 }
 291
 292 bool matrix_is_modified(void)
 293 {
 294     if (debouncing) return false;
 295     return true;
 296 }
 297
 298 inline
 299 bool matrix_is_on(uint8_t row, uint8_t col)
 300 {
 301     return (matrix[row] & ((matrix_row_t)1<<col));
 302 }
 303
 304 inline
 305 matrix_row_t matrix_get_row(uint8_t row)
 306 {
 307     return matrix[row];
 308 }
 309
 310 void matrix_print(void)
 311 {
 312     print("\nr/c 0123456789ABCDEF\n");
 313     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 314         phex(row); print(": ");
 315         pbin_reverse16(matrix_get_row(row));
 316         print("\n");
 317     }
 318 }
 319
 320 uint8_t matrix_key_count(void)
 321 {
 322     uint8_t count = 0;
 323     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 324         count += bitpop16(matrix[i]);
 325     }
 326     return count;
 327 }
 328
 329 #if (DIODE_DIRECTION == COL2ROW)
 330
 331 static void init_cols(void)
 332 {
 333     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 334         uint8_t pin = col_pins[x];
 335         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 336         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 337     }
 338 }
 339
 340 static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 341 {
 342     // Store last value of row prior to reading
 343     matrix_row_t last_row_value = current_matrix[current_row];
 344
 345     // Clear data in matrix row
 346     current_matrix[current_row] = 0;
 347
 348     // Select row and wait for row selecton to stabilize
 349     select_row(current_row);
 350     wait_us(30);
 351
 352     // For each col...
 353     for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
 354
 355         // Select the col pin to read (active low)
 356         uint8_t pin = col_pins[col_index];
 357         uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
 358
 359         // Populate the matrix row with the state of the col pin
 360         current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << col_index);
 361     }
 362
 363     // Unselect row
 364     unselect_row(current_row);
 365
 366     return (last_row_value != current_matrix[current_row]);
 367 }
 368
 369 static void select_row(uint8_t row)
 370 {
 371     uint8_t pin = row_pins[row];
 372     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 373     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 374 }
 375
 376 static void unselect_row(uint8_t row)
 377 {
 378     uint8_t pin = row_pins[row];
 379     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 380     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 381 }
 382
 383 static void unselect_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 #elif (DIODE_DIRECTION == ROW2COL)
 393
 394 static void init_rows(void)
 395 {
 396     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 397         uint8_t pin = row_pins[x];
 398         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 399         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 400     }
 401 }
 402
 403 static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 404 {
 405     bool matrix_changed = false;
 406
 407     // Select col and wait for col selecton to stabilize
 408     select_col(current_col);
 409     wait_us(30);
 410
 411     // For each row...
 412     for(uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++)
 413     {
 414
 415         // Store last value of row prior to reading
 416         matrix_row_t last_row_value = current_matrix[row_index];
 417
 418         // Check row pin state
 419         if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0)
 420         {
 421             // Pin LO, set col bit
 422             current_matrix[row_index] |= (ROW_SHIFTER << current_col);
 423         }
 424         else
 425         {
 426             // Pin HI, clear col bit
 427             current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
 428         }
 429
 430         // Determine if the matrix changed state
 431         if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
 432         {
 433             matrix_changed = true;
 434         }
 435     }
 436
 437     // Unselect col
 438     unselect_col(current_col);
 439
 440     return matrix_changed;
 441 }
 442
 443 static void select_col(uint8_t col)
 444 {
 445     uint8_t pin = col_pins[col];
 446     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 447     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 448 }
 449
 450 static void unselect_col(uint8_t col)
 451 {
 452     uint8_t pin = col_pins[col];
 453     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 454     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 455 }
 456
 457 static void unselect_cols(void)
 458 {
 459     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 460         uint8_t pin = col_pins[x];
 461         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 462         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 463     }
 464 }
 465
 466 #endif