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             }
 152
 153 #       else
 154             read_cols_on_row(matrix+offset, current_row);
 155 #       endif
 156
 157     }
 158
 159 #elif (DIODE_DIRECTION == ROW2COL)
 160     // Set col, read rows
 161     for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
 162 #       if (DEBOUNCING_DELAY > 0)
 163             bool matrix_changed = read_rows_on_col(matrix_debouncing+offset, current_col);
 164             if (matrix_changed) {
 165                 debouncing = true;
 166                 debouncing_time = timer_read();
 167             }
 168 #       else
 169              read_rows_on_col(matrix+offset, current_col);
 170 #       endif
 171
 172     }
 173 #endif
 174
 175 #   if (DEBOUNCING_DELAY > 0)
 176         if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
 177             for (uint8_t i = 0; i < ROWS_PER_HAND; i++) {
 178                 matrix[i+offset] = matrix_debouncing[i+offset];
 179             }
 180             debouncing = false;
 181         }
 182 #   endif
 183
 184     return 1;
 185 }
 186
 187 #ifdef USE_I2C
 188
 189 // Get rows from other half over i2c
 190 int i2c_transaction(void) {
 191     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 192
 193     int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
 194     if (err) goto i2c_error;
 195
 196     // start of matrix stored at 0x00
 197     err = i2c_master_write(0x00);
 198     if (err) goto i2c_error;
 199
 200     // Start read
 201     err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
 202     if (err) goto i2c_error;
 203
 204     if (!err) {
 205         int i;
 206         for (i = 0; i < ROWS_PER_HAND-1; ++i) {
 207             matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
 208         }
 209         matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
 210         i2c_master_stop();
 211     } else {
 212 i2c_error: // the cable is disconnceted, or something else went wrong
 213         i2c_reset_state();
 214         return err;
 215     }
 216
 217     return 0;
 218 }
 219
 220 #else // USE_SERIAL
 221
 222 int serial_transaction(void) {
 223     int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 224
 225     if (serial_update_buffers()) {
 226         return 1;
 227     }
 228
 229     for (int i = 0; i < ROWS_PER_HAND; ++i) {
 230         matrix[slaveOffset+i] = serial_slave_buffer[i];
 231     }
 232
 233 #ifdef BACKLIGHT_ENABLE
 234     // Write backlight level for slave to read
 235     serial_master_buffer[SERIAL_LED_ADDR] = get_backlight_level();
 236 #endif
 237     return 0;
 238 }
 239 #endif
 240
 241 uint8_t matrix_scan(void)
 242 {
 243     uint8_t ret = _matrix_scan();
 244
 245 #ifdef USE_I2C
 246     if( i2c_transaction() ) {
 247 #else // USE_SERIAL
 248     if( serial_transaction() ) {
 249 #endif
 250         // turn on the indicator led when halves are disconnected
 251         TXLED1;
 252
 253         error_count++;
 254
 255         if (error_count > ERROR_DISCONNECT_COUNT) {
 256             // reset other half if disconnected
 257             int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
 258             for (int i = 0; i < ROWS_PER_HAND; ++i) {
 259                 matrix[slaveOffset+i] = 0;
 260             }
 261         }
 262     } else {
 263         // turn off the indicator led on no error
 264         TXLED0;
 265         error_count = 0;
 266     }
 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
 284 #ifdef BACKLIGHT_ENABLE
 285     // Read backlight level sent from master and update level on slave
 286     backlight_set(serial_master_buffer[SERIAL_LED_ADDR]);
 287 #endif
 288 #endif
 289 }
 290
 291 bool matrix_is_modified(void)
 292 {
 293     if (debouncing) return false;
 294     return true;
 295 }
 296
 297 inline
 298 bool matrix_is_on(uint8_t row, uint8_t col)
 299 {
 300     return (matrix[row] & ((matrix_row_t)1<<col));
 301 }
 302
 303 inline
 304 matrix_row_t matrix_get_row(uint8_t row)
 305 {
 306     return matrix[row];
 307 }
 308
 309 void matrix_print(void)
 310 {
 311     print("\nr/c 0123456789ABCDEF\n");
 312     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 313         phex(row); print(": ");
 314         pbin_reverse16(matrix_get_row(row));
 315         print("\n");
 316     }
 317 }
 318
 319 uint8_t matrix_key_count(void)
 320 {
 321     uint8_t count = 0;
 322     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 323         count += bitpop16(matrix[i]);
 324     }
 325     return count;
 326 }
 327
 328 #if (DIODE_DIRECTION == COL2ROW)
 329
 330 static void init_cols(void)
 331 {
 332     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 333         uint8_t pin = col_pins[x];
 334         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 335         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 336     }
 337 }
 338
 339 static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
 340 {
 341     // Store last value of row prior to reading
 342     matrix_row_t last_row_value = current_matrix[current_row];
 343
 344     // Clear data in matrix row
 345     current_matrix[current_row] = 0;
 346
 347     // Select row and wait for row selecton to stabilize
 348     select_row(current_row);
 349     wait_us(30);
 350
 351     // For each col...
 352     for(uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
 353
 354         // Select the col pin to read (active low)
 355         uint8_t pin = col_pins[col_index];
 356         uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
 357
 358         // Populate the matrix row with the state of the col pin
 359         current_matrix[current_row] |=  pin_state ? 0 : (ROW_SHIFTER << col_index);
 360     }
 361
 362     // Unselect row
 363     unselect_row(current_row);
 364
 365     return (last_row_value != current_matrix[current_row]);
 366 }
 367
 368 static void select_row(uint8_t row)
 369 {
 370     uint8_t pin = row_pins[row];
 371     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 372     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 373 }
 374
 375 static void unselect_row(uint8_t row)
 376 {
 377     uint8_t pin = row_pins[row];
 378     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 379     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 380 }
 381
 382 static void unselect_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 #elif (DIODE_DIRECTION == ROW2COL)
 392
 393 static void init_rows(void)
 394 {
 395     for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
 396         uint8_t pin = row_pins[x];
 397         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 398         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 399     }
 400 }
 401
 402 static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
 403 {
 404     bool matrix_changed = false;
 405
 406     // Select col and wait for col selecton to stabilize
 407     select_col(current_col);
 408     wait_us(30);
 409
 410     // For each row...
 411     for(uint8_t row_index = 0; row_index < ROWS_PER_HAND; row_index++)
 412     {
 413
 414         // Store last value of row prior to reading
 415         matrix_row_t last_row_value = current_matrix[row_index];
 416
 417         // Check row pin state
 418         if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0)
 419         {
 420             // Pin LO, set col bit
 421             current_matrix[row_index] |= (ROW_SHIFTER << current_col);
 422         }
 423         else
 424         {
 425             // Pin HI, clear col bit
 426             current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
 427         }
 428
 429         // Determine if the matrix changed state
 430         if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
 431         {
 432             matrix_changed = true;
 433         }
 434     }
 435
 436     // Unselect col
 437     unselect_col(current_col);
 438
 439     return matrix_changed;
 440 }
 441
 442 static void select_col(uint8_t col)
 443 {
 444     uint8_t pin = col_pins[col];
 445     _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF); // OUT
 446     _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
 447 }
 448
 449 static void unselect_col(uint8_t col)
 450 {
 451     uint8_t pin = col_pins[col];
 452     _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 453     _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 454 }
 455
 456 static void unselect_cols(void)
 457 {
 458     for(uint8_t x = 0; x < MATRIX_COLS; x++) {
 459         uint8_t pin = col_pins[x];
 460         _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
 461         _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF); // HI
 462     }
 463 }
 464
 465 #endif