matrix.c (6509B)
1 /* 2 Copyright 2017 MechMerlin <mechmerlin@gmail.com> 3 This program is free software: you can redistribute it and/or modify 4 it under the terms of the GNU General Public License as published by 5 the Free Software Foundation, either version 2 of the License, or 6 (at your option) any later version. 7 8 This program is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License 14 along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 17 #include <util/delay.h> 18 #include <avr/io.h> 19 #include <stdio.h> 20 #include "matrix.h" 21 #include "util.h" 22 #include "print.h" 23 #include "debug.h" 24 25 #ifndef DEBOUNCE 26 # define DEBOUNCE 5 27 #endif 28 29 static uint8_t debouncing = DEBOUNCE; 30 31 /* matrix state(1:on, 0:off) */ 32 static matrix_row_t matrix[MATRIX_ROWS]; 33 static matrix_row_t matrix_debouncing[MATRIX_ROWS]; 34 35 static uint8_t read_rows(uint8_t col); 36 static void init_rows(void); 37 static void unselect_cols(void); 38 static void select_col(uint8_t col); 39 40 41 __attribute__ ((weak)) 42 void matrix_init_kb(void) { 43 matrix_init_user(); 44 } 45 46 __attribute__ ((weak)) 47 void matrix_scan_kb(void) { 48 matrix_scan_user(); 49 } 50 51 __attribute__ ((weak)) 52 void matrix_init_user(void) { 53 } 54 55 __attribute__ ((weak)) 56 void matrix_scan_user(void) { 57 } 58 59 void backlight_init_ports(void) 60 { 61 DDRD |= 0b11010000; 62 PORTD &= ~0b01010000; 63 PORTD |= 0b10000000; 64 DDRB |= 0b00011111; 65 PORTB &= ~0b00001110; 66 PORTB |= 0b00010001; 67 DDRE |= 0b01000000; 68 PORTE &= ~0b01000000; 69 } 70 71 void matrix_init(void) { 72 backlight_init_ports(); 73 unselect_cols(); 74 init_rows(); 75 76 for (uint8_t i=0; i < MATRIX_ROWS; i++) { 77 matrix[i] = 0; 78 matrix_debouncing[i] = 0; 79 } 80 81 matrix_init_kb(); 82 } 83 84 uint8_t matrix_scan(void) { 85 for (uint8_t col = 0; col < MATRIX_COLS; col++) { 86 select_col(col); 87 _delay_us(3); 88 89 uint8_t rows = read_rows(col); 90 91 for (uint8_t row = 0; row < MATRIX_ROWS; row++) { 92 bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col); 93 bool curr_bit = rows & (1<<row); 94 if (prev_bit != curr_bit) { 95 matrix_debouncing[row] ^= ((matrix_row_t)1<<col); 96 if (debouncing) { 97 dprint("bounce!: "); dprintf("%02X", debouncing); dprintln(); 98 } 99 debouncing = DEBOUNCE; 100 } 101 } 102 unselect_cols(); 103 } 104 105 if (debouncing) { 106 if (--debouncing) { 107 _delay_ms(1); 108 } else { 109 for (uint8_t i = 0; i < MATRIX_ROWS; i++) { 110 matrix[i] = matrix_debouncing[i]; 111 } 112 } 113 } 114 115 matrix_scan_kb(); 116 return 1; 117 } 118 119 inline matrix_row_t matrix_get_row(uint8_t row) { 120 return matrix[row]; 121 } 122 123 void matrix_print(void) { 124 print("\nr/c 0123456789ABCDEF\n"); 125 for (uint8_t row = 0; row < MATRIX_ROWS; row++) { 126 xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row))); 127 } 128 } 129 130 /* Row pin configuration - diode connected 131 * row: 0 1 2 3 4 132 * pin: PD0 PD1 PD2 PD3 PD5 133 * 134 * Caps Lock uses its own pin PE2 on the column pin, row pin is grounded 135 */ 136 static void init_rows(void) { 137 DDRD &= ~0b00101111; 138 PORTD &= ~0b00101111; 139 140 DDRE &= ~0b00000100; 141 PORTE |= 0b00000100; 142 } 143 144 static uint8_t read_rows(uint8_t col) { 145 146 return (PIND&(1<<0) ? (1<<0) : 0) | 147 (PIND&(1<<1) ? (1<<1) : 0) | 148 (PIND&(1<<2) ? (1<<2) : 0) | 149 (PIND&(1<<3) ? (1<<3) : 0) | 150 (PIND&(1<<5) ? (1<<4) : 0) | 151 (col==0 ? ((PINE&(1<<2) ? 0 : (1<<2))) : 0); 152 153 } 154 155 uint8_t read_fwkey(void) 156 { 157 return PINE&(1<<2) ? 0 : (1<<2); 158 } 159 160 /* Columns 0 - 15 161 * 162 * atmega32u4 decoder pin 163 * PC6 U1 E3 164 * PB6 U2 E3 165 * PF0 U1, U2 A0 166 * PF1 U1, U2 A1 167 * PC7 U1, U2 A2 168 * 169 * These columns uses two 74HC237D 3 to 8 bit demultiplexers. 170 * col / pin: PC6 PB6 PF0 PF1 PC7 Decoder Pin 171 * 0: 1 0 0 0 0 U1 Y0 172 * 1: 1 0 1 0 0 U1 Y1 173 * 2: 1 0 0 1 0 U1 Y2 174 * 3: 1 0 1 1 0 U1 Y3 175 * 4: 1 0 0 0 1 U1 Y4 176 * 5: 1 0 1 0 1 U1 Y5 177 * 6: 1 0 0 1 1 U1 Y6 178 * 7: 1 0 1 1 1 U1 Y7 179 * 8: 0 1 0 0 0 U2 Y0 180 * 9: 0 1 1 0 0 U2 Y1 181 * 10: 0 1 0 1 0 U2 Y2 182 * 11: 0 1 1 1 0 U2 Y3 183 * 12: 0 1 0 0 1 U2 Y4 184 * 13: 0 1 1 0 1 U2 Y5 185 * 14: 0 1 0 1 1 U2 Y6 186 * 187 */ 188 static void unselect_cols(void) { 189 DDRB |= 0b01000000; 190 PORTB &= ~0b01000000; 191 192 DDRC |= 0b11000000; 193 PORTC &= ~0b11000000; 194 195 DDRF |= 0b00000011; 196 PORTF &= ~0b00000011; 197 } 198 199 static void select_col(uint8_t col) { 200 201 switch (col) { 202 case 0: 203 PORTC |= 0b01000000; 204 break; 205 case 1: 206 PORTC |= 0b01000000; 207 PORTF |= 0b00000001; 208 break; 209 case 2: 210 PORTC |= 0b01000000; 211 PORTF |= 0b00000010; 212 break; 213 case 3: 214 PORTC |= 0b01000000; 215 PORTF |= 0b00000011; 216 break; 217 case 4: 218 PORTC |= 0b11000000; 219 break; 220 case 5: 221 PORTC |= 0b11000000; 222 PORTF |= 0b00000001; 223 break; 224 case 6: 225 PORTC |= 0b11000000; 226 PORTF |= 0b00000010; 227 break; 228 case 7: 229 PORTC |= 0b11000000; 230 PORTF |= 0b00000011; 231 break; 232 case 8: 233 PORTB |= 0b01000000; 234 break; 235 case 9: 236 PORTB |= 0b01000000; 237 PORTF |= 0b00000001; 238 break; 239 case 10: 240 PORTB |= 0b01000000; 241 PORTF |= 0b00000010; 242 break; 243 case 11: 244 PORTB |= 0b01000000; 245 PORTF |= 0b00000011; 246 break; 247 case 12: 248 PORTB |= 0b01000000; 249 PORTC |= 0b10000000; 250 break; 251 case 13: 252 PORTB |= 0b01000000; 253 PORTF |= 0b00000001; 254 PORTC |= 0b10000000; 255 break; 256 case 14: 257 PORTB |= 0b01000000; 258 PORTF |= 0b00000010; 259 PORTC |= 0b10000000; 260 break; 261 } 262 }