keyboards/amj96/matrix.c

   1 /*
   2 Copyright 2014 Kai Ryu <kai1103@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 "print.h"
  26 #include "debug.h"
  27 #include "util.h"
  28 #include "matrix.h"
  29 #ifdef UART_RGB_ENABLE
  30 #include "uart_rgb.h"
  31 #endif
  32
  33 #ifndef DEBOUNCE
  34 #   define DEBOUNCE 5
  35 #endif
  36 static uint8_t debouncing = DEBOUNCE;
  37
  38 /* matrix state(1:on, 0:off) */
  39 static matrix_row_t matrix[MATRIX_ROWS];
  40 static matrix_row_t matrix_debouncing[MATRIX_ROWS];
  41
  42 static matrix_row_t read_cols(void);
  43 static void init_cols(void);
  44 static void init_rows(void);
  45 static void unselect_rows(void);
  46 static void select_row(uint8_t row);
  47
  48 inline
  49 uint8_t matrix_rows(void)
  50 {
  51     return MATRIX_ROWS;
  52 }
  53
  54 inline
  55 uint8_t matrix_cols(void)
  56 {
  57     return MATRIX_COLS;
  58 }
  59
  60 void matrix_init(void)
  61 {
  62
  63 #ifdef UART_RGB_ENABLE
  64     uart_rgb_init();
  65 #endif
  66     // disable JTAG
  67     MCUCR = _BV(JTD);
  68     MCUCR = _BV(JTD);
  69
  70     // 85 REST
  71     DDRD |= _BV(PD7);
  72     PORTD |= _BV(PD7);
  73
  74     // initialize row and col
  75     init_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
  85 uint8_t matrix_scan(void)
  86 {
  87     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
  88         select_row(i);
  89         _delay_us(30);  // without this wait read unstable value.
  90         matrix_row_t cols = read_cols();
  91         if (matrix_debouncing[i] != cols) {
  92             matrix_debouncing[i] = cols;
  93             if (debouncing) {
  94                 debug("bounce!: "); debug_hex(debouncing); debug("\n");
  95             }
  96             debouncing = DEBOUNCE;
  97         }
  98         unselect_rows();
  99     }
 100
 101     if (debouncing) {
 102         if (--debouncing) {
 103             _delay_ms(1);
 104         } else {
 105             for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 106                 matrix[i] = matrix_debouncing[i];
 107             }
 108         }
 109     }
 110
 111     return 1;
 112 }
 113
 114 bool matrix_is_modified(void)
 115 {
 116     if (debouncing) return false;
 117     return true;
 118 }
 119
 120 inline
 121 bool matrix_is_on(uint8_t row, uint8_t col)
 122 {
 123     return (matrix[row] & ((matrix_row_t)1<<col));
 124 }
 125
 126 inline
 127 matrix_row_t matrix_get_row(uint8_t row)
 128 {
 129     return matrix[row];
 130 }
 131
 132 void matrix_print(void)
 133 {
 134     print("\nr/c 0123456789ABCDEF\n");
 135     for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
 136         phex(row); print(": ");
 137         pbin_reverse16(matrix_get_row(row));
 138         print("\n");
 139     }
 140 }
 141
 142 uint8_t matrix_key_count(void)
 143 {
 144     uint8_t count = 0;
 145     for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
 146         count += bitpop16(matrix[i]);
 147     }
 148     return count;
 149 }
 150
 151 /* Column pin configuration
 152  * col: 0   1   2   3   4   5   6   7   8   9   10  11  12  13  14  15
 153  * pin: F7  F6  F5  F4  F1  F0  E6  D7  D6  D5  D1  D0  B7  B6  B0  C7
 154  * */
 155 static void  init_cols(void)
 156 {
 157     // Input with pull-up(DDR:0, PORT:1)
 158     DDRF &= 0b00001100;
 159     PORTF |= 0b11110011;
 160
 161     DDRD &= 0b00011100;
 162     PORTD |= 0b11100011;
 163
 164     DDRB &= ~(_BV(PB6) | _BV(PB7)| _BV(PB0));
 165     PORTB |= (_BV(PB6) | _BV(PB7)| _BV(PB0));
 166
 167     DDRE &= ~_BV(PE6);
 168     PORTE |= _BV(PE6);
 169
 170     DDRC &= ~_BV(PC7);
 171     PORTC |= _BV(PC7);
 172
 173 }
 174
 175 static matrix_row_t read_cols(void)
 176 {
 177
 178     return (PINF&_BV(PF7) ? 0 : (1<<0)) |
 179            (PINF&_BV(PF6) ? 0 : (1<<1)) |
 180            (PINF&_BV(PF5) ? 0 : (1<<2)) |
 181            (PINF&_BV(PF4) ? 0 : (1<<3)) |
 182            (PINF&_BV(PF1) ? 0 : (1<<4)) |
 183            (PINF&_BV(PF0) ? 0 : (1<<5)) |
 184            (PINE&_BV(PE6) ? 0 : (1<<6)) |
 185            (PIND&_BV(PD7) ? 0 : (1<<7)) |
 186            (PIND&_BV(PD6) ? 0 : (1<<8)) |
 187            (PIND&_BV(PD5) ? 0 : (1<<9)) |
 188            (PIND&_BV(PD1) ? 0 : (1<<10)) |
 189            (PIND&_BV(PD0) ? 0 : (1<<11)) |
 190            (PINB&_BV(PB7) ? 0 : (1<<12)) |
 191            (PINB&_BV(PB6) ? 0 : (1<<13)) |
 192            (PINB&_BV(PB0) ? 0 : (1<<14)) |
 193            (PINC&_BV(PC7) ? 0 : (1<<15));
 194 }
 195
 196 /* Row pin configuration
 197  * row:     0   1   2   3   4   5   x
 198  * pin: B3  0   1   0   1   0   1   1
 199  *      B2  0   0   1   1   0   0   1
 200  *      B1  0   0   0   0   1   1   1
 201  */
 202
 203 static void init_rows(void)
 204 {
 205      DDRB  |= (1<<PB1 | 1<<PB2 | 1<<PB3);
 206 }
 207
 208 static void unselect_rows(void)
 209 {
 210     // Hi-Z(DDR:0, PORT:0) to unselect
 211     PORTB |= (1<<PB1);
 212     PORTB |= (1<<PB2);
 213     PORTB |= (1<<PB3);
 214 }
 215
 216 static void select_row(uint8_t row)
 217 {
 218     // Output low(DDR:1, PORT:0) to select
 219     (row & (1<<0)) ? (PORTB |= (1<<PB3)) : (PORTB &= ~(1<<PB3));
 220     (row & (1<<1)) ? (PORTB |= (1<<PB2)) : (PORTB &= ~(1<<PB2));
 221     (row & (1<<2)) ? (PORTB |= (1<<PB1)) : (PORTB &= ~(1<<PB1));
 222 }