keyboard/ergodox/matrix.c

   1 /*
   2 Copyright 2013 Oleg Kostyuk <cub.uanic@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 <util/delay.h>
  25 #include "action_layer.h"
  26 #include "print.h"
  27 #include "debug.h"
  28 #include "util.h"
  29 #include "matrix.h"
  30 #include "ergodox.h"
  31 #include "i2cmaster.h"
  32 #ifdef DEBUG_MATRIX_SCAN_RATE
  33 #include  "timer.h"
  34 #endif
  35
  36 #ifndef DEBOUNCE
  37 #   define DEBOUNCE     5
  38 #endif
  39 static uint8_t debouncing = DEBOUNCE;
  40
  41 /* matrix state(1:on, 0:off) */
  42 static matrix_row_t matrix[MATRIX_ROWS];
  43 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  44
  45 static matrix_row_t read_cols(uint8_t row);
  46 static void init_cols(void);
  47 static void unselect_rows(void);
  48 static void select_row(uint8_t row);
  49
  50 static uint8_t mcp23018_reset_loop;
  51
  52 #ifdef DEBUG_MATRIX_SCAN_RATE
  53 uint32_t matrix_timer;
  54 uint32_t matrix_scan_count;
  55 #endif
  56
  57 inline
  58 uint8_t matrix_rows(void)
  59 {
  60     return MATRIX_ROWS;
  61 }
  62
  63 inline
  64 uint8_t matrix_cols(void)
  65 {
  66     return MATRIX_COLS;
  67 }
  68
  69 void matrix_init(void)
  70 {
  71     // initialize row and col
  72     init_ergodox();
  73     mcp23018_status = init_mcp23018();
  74     ergodox_blink_all_leds();
  75     unselect_rows();
  76     init_cols();
  77
  78     // initialize matrix state: all keys off
  79     for (uint8_t i=0; i < MATRIX_ROWS; i++) {
  80         matrix[i] = 0;
  81         matrix_debouncing[i] = 0;
  82     }
  83
  84 #ifdef DEBUG_MATRIX_SCAN_RATE
  85     matrix_timer = timer_read32();
  86     matrix_scan_count = 0;
  87 #endif
  88 }
  89
  90 uint8_t matrix_scan(void)
  91 {
  92     if (mcp23018_status) { // if there was an error
  93         if (++mcp23018_reset_loop == 0) {
  94             // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
  95             // this will be approx bit more frequent than once per second
  96             print("trying to reset mcp23018\n");
  97             mcp23018_status = init_mcp23018();
  98             if (mcp23018_status) {
  99                 print("left side not responding\n");
 100             } else {
 101                 print("left side attached\n");
 102                 ergodox_blink_all_leds();
 103             }
 104         }
 105     }
 106
 107 #ifdef DEBUG_MATRIX_SCAN_RATE
 108     matrix_scan_count++;
 109
 110     uint32_t timer_now = timer_read32();
 111     if (TIMER_DIFF_32(timer_now, matrix_timer)>1000) {
 112         print("matrix scan frequency: ");
 113         pdec(matrix_scan_count);
 114         print("\n");
 115
 116         matrix_timer = timer_now;
 117         matrix_scan_count = 0;
 118     }
 119 #endif
 120
 121 #ifdef KEYMAP_CUB
 122     uint8_t layer = biton32(layer_state);
 123
 124     ergodox_board_led_off();
 125     ergodox_left_led_1_off();
 126     ergodox_left_led_2_off();
 127     ergodox_left_led_3_off();
 128     switch (layer) {
 129         case 1:
 130             // all
 131             ergodox_left_led_1_on();
 132             ergodox_left_led_2_on();
 133             ergodox_left_led_3_on();
 134             break;
 135         case 2:
 136             // blue
 137             ergodox_left_led_2_on();
 138             break;
 139         case 8:
 140             // blue and green
 141             ergodox_left_led_2_on();
 142             // break missed intentionally
 143         case 3:
 144             // green
 145             ergodox_left_led_3_on();
 146             break;
 147         case 6:
 148             ergodox_board_led_on();
 149             // break missed intentionally
 150         case 4:
 151         case 5:
 152         case 7:
 153             // white
 154             ergodox_left_led_1_on();
 155             break;
 156         case 9:
 157             // white+green
 158             ergodox_left_led_1_on();
 159             ergodox_left_led_3_on();
 160             break;
 161         default:
 162             // none
 163             break;
 164     }
 165
 166     mcp23018_status = ergodox_left_leds_update();
 167 #endif
 168
 169     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 170         select_row(i);
 171         matrix_row_t cols = read_cols(i);
 172         if (matrix_debouncing[i] != cols) {
 173             matrix_debouncing[i] = cols;
 174             if (debouncing) {
 175                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
 176             }
 177             debouncing = DEBOUNCE;
 178         }
 179         unselect_rows();
 180     }
 181
 182     if (debouncing) {
 183         if (--debouncing) {
 184             _delay_ms(1);
 185         } else {
 186             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 187                 matrix[i] = matrix_debouncing[i];
 188             }
 189         }
 190     }
 191
 192     return 1;
 193 }
 194
 195 bool matrix_is_modified(void)
 196 {
 197     if (debouncing) return false;
 198     return true;
 199 }
 200
 201 inline
 202 bool matrix_is_on(uint8_t row, uint8_t col)
 203 {
 204     return (matrix[row] & ((matrix_row_t)1<<col));
 205 }
 206
 207 inline
 208 matrix_row_t matrix_get_row(uint8_t row)
 209 {
 210     return matrix[row];
 211 }
 212
 213 void matrix_print(void)
 214 {
 215     print("\nr/c 0123456789ABCDEF\n");
 216     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 217         phex(row); print(": ");
 218         pbin_reverse16(matrix_get_row(row));
 219         print("\n");
 220     }
 221 }
 222
 223 uint8_t matrix_key_count(void)
 224 {
 225     uint8_t count = 0;
 226     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 227         count += bitpop16(matrix[i]);
 228     }
 229     return count;
 230 }
 231
 232 /* Column pin configuration
 233  *
 234  * Teensy
 235  * col: 0   1   2   3   4   5
 236  * pin: F0  F1  F4  F5  F6  F7
 237  *
 238  * MCP23018
 239  * col: 0   1   2   3   4   5
 240  * pin: B5  B4  B3  B2  B1  B0
 241  */
 242 static void  init_cols(void)
 243 {
 244     // init on mcp23018
 245     // not needed, already done as part of init_mcp23018()
 246
 247     // init on teensy
 248     // Input with pull-up(DDR:0, PORT:1)
 249     DDRF  &= ~(1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0);
 250     PORTF |=  (1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0);
 251 }
 252
 253 static matrix_row_t read_cols(uint8_t row)
 254 {
 255     if (row < 7) {
 256         if (mcp23018_status) { // if there was an error
 257             return 0;
 258         } else {
 259             uint8_t data = 0;
 260             mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
 261             mcp23018_status = i2c_write(GPIOB);             if (mcp23018_status) goto out;
 262             mcp23018_status = i2c_start(I2C_ADDR_READ);     if (mcp23018_status) goto out;
 263             data = i2c_readNak();
 264             data = ~data;
 265         out:
 266             i2c_stop();
 267             return data;
 268         }
 269     } else {
 270         _delay_us(30);  // without this wait read unstable value.
 271         // read from teensy
 272         return
 273             (PINF&(1<<0) ? 0 : (1<<0)) |
 274             (PINF&(1<<1) ? 0 : (1<<1)) |
 275             (PINF&(1<<4) ? 0 : (1<<2)) |
 276             (PINF&(1<<5) ? 0 : (1<<3)) |
 277             (PINF&(1<<6) ? 0 : (1<<4)) |
 278             (PINF&(1<<7) ? 0 : (1<<5)) ;
 279     }
 280 }
 281
 282 /* Row pin configuration
 283  *
 284  * Teensy
 285  * row: 7   8   9   10  11  12  13
 286  * pin: B0  B1  B2  B3  D2  D3  C6
 287  *
 288  * MCP23018
 289  * row: 0   1   2   3   4   5   6
 290  * pin: A0  A1  A2  A3  A4  A5  A6
 291  */
 292 static void unselect_rows(void)
 293 {
 294     // unselect on mcp23018
 295     if (mcp23018_status) { // if there was an error
 296         // do nothing
 297     } else {
 298         // set all rows hi-Z : 1
 299         mcp23018_status = i2c_start(I2C_ADDR_WRITE);    if (mcp23018_status) goto out;
 300         mcp23018_status = i2c_write(GPIOA);             if (mcp23018_status) goto out;
 301         mcp23018_status = i2c_write( 0xFF
 302                               & ~(ergodox_left_led_3<<LEFT_LED_3_SHIFT)
 303                           );                            if (mcp23018_status) goto out;
 304     out:
 305         i2c_stop();
 306     }
 307
 308     // unselect on teensy
 309     // Hi-Z(DDR:0, PORT:0) to unselect
 310     DDRB  &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
 311     PORTB &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
 312     DDRD  &= ~(1<<2 | 1<<3);
 313     PORTD &= ~(1<<2 | 1<<3);
 314     DDRC  &= ~(1<<6);
 315     PORTC &= ~(1<<6);
 316 }
 317
 318 static void select_row(uint8_t row)
 319 {
 320     if (row < 7) {
 321         // select on mcp23018
 322         if (mcp23018_status) { // if there was an error
 323             // do nothing
 324         } else {
 325             // set active row low  : 0
 326             // set other rows hi-Z : 1
 327             mcp23018_status = i2c_start(I2C_ADDR_WRITE);        if (mcp23018_status) goto out;
 328             mcp23018_status = i2c_write(GPIOA);                 if (mcp23018_status) goto out;
 329             mcp23018_status = i2c_write( 0xFF & ~(1<<row)
 330                                   & ~(ergodox_left_led_3<<LEFT_LED_3_SHIFT)
 331                               );                                if (mcp23018_status) goto out;
 332         out:
 333             i2c_stop();
 334         }
 335     } else {
 336         // select on teensy
 337         // Output low(DDR:1, PORT:0) to select
 338         switch (row) {
 339             case 7:
 340                 DDRB  |= (1<<0);
 341                 PORTB &= ~(1<<0);
 342                 break;
 343             case 8:
 344                 DDRB  |= (1<<1);
 345                 PORTB &= ~(1<<1);
 346                 break;
 347             case 9:
 348                 DDRB  |= (1<<2);
 349                 PORTB &= ~(1<<2);
 350                 break;
 351             case 10:
 352                 DDRB  |= (1<<3);
 353                 PORTB &= ~(1<<3);
 354                 break;
 355             case 11:
 356                 DDRD  |= (1<<2);
 357                 PORTD &= ~(1<<3);
 358                 break;
 359             case 12:
 360                 DDRD  |= (1<<3);
 361                 PORTD &= ~(1<<3);
 362                 break;
 363             case 13:
 364                 DDRC  |= (1<<6);
 365                 PORTC &= ~(1<<6);
 366                 break;
 367         }
 368     }
 369 }