diff options
Diffstat (limited to 'keyboard/kmac/matrix.c')
| -rw-r--r-- | keyboard/kmac/matrix.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/keyboard/kmac/matrix.c b/keyboard/kmac/matrix.c new file mode 100644 index 0000000000..5248a29b9d --- /dev/null +++ b/keyboard/kmac/matrix.c @@ -0,0 +1,283 @@ +/* +Copyright 2013 Mathias Andersson <wraul@dbox.se> + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <stdint.h> +#include <stdbool.h> +#include <avr/io.h> +#include <util/delay.h> +#include "print.h" +#include "debug.h" +#include "util.h" +#include "matrix.h" + + +#ifndef DEBOUNCE +# define DEBOUNCE 0 +#endif +static uint8_t debouncing = DEBOUNCE; + +/* matrix state(1:on, 0:off) */ +static matrix_row_t matrix[MATRIX_ROWS]; +static matrix_row_t matrix_debouncing[MATRIX_ROWS]; + +static uint8_t read_rows(void); +static uint8_t read_caps(void); +static void init_rows(void); +static void unselect_cols(void); +static void select_col(uint8_t col); + +inline +uint8_t matrix_rows(void) +{ + return MATRIX_ROWS; +} + +inline +uint8_t matrix_cols(void) +{ + return MATRIX_COLS; +} + +void matrix_init(void) +{ + unselect_cols(); + init_rows(); + // initialize matrix state: all keys off + for (uint8_t i=0; i < MATRIX_ROWS; i++) { + matrix[i] = 0; + matrix_debouncing[i] = 0; + } +} + +uint8_t matrix_scan(void) +{ + for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16 + select_col(col); + _delay_us(3); // TODO: Determine the correct value needed here. + uint8_t rows = read_rows(); + // Use the otherwise unused col: 0 row: 3 for caps lock. + if(col == 0) { + rows |= read_caps(); + } + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5 + bool prev_bit = matrix_debouncing[row] & ((matrix_row_t)1<<col); + bool curr_bit = rows & (1<<row); + if (prev_bit != curr_bit) { + matrix_debouncing[row] ^= ((matrix_row_t)1<<col); + if (debouncing) { + dprint("bounce!: "); dprintf("%02X", debouncing); dprintln(); + } + debouncing = DEBOUNCE; + } + } + unselect_cols(); + } + + if (debouncing) { + if (--debouncing) { + _delay_ms(1); + } else { + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + matrix[i] = matrix_debouncing[i]; + } + } + } + + return 1; +} + +bool matrix_is_modified(void) +{ + if (debouncing) return false; + return true; +} + +inline +bool matrix_is_on(uint8_t row, uint8_t col) +{ + return (matrix[row] & ((matrix_row_t)1<<col)); +} + +inline +matrix_row_t matrix_get_row(uint8_t row) +{ + return matrix[row]; +} + +void matrix_print(void) +{ + print("\nr/c 0123456789ABCDEF\n"); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + xprintf("%02X: %032lb\n", row, bitrev32(matrix_get_row(row))); + } +} + +uint8_t matrix_key_count(void) +{ + uint8_t count = 0; + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + count += bitpop32(matrix[i]); + } + return count; +} + +/* Row pin configuration + * row: 0 1 2 3 4 5 + * pin: D0 D1 D2 D3 D5 B7 + * + * Caps lock uses its own pin PE2 + */ +static void init_rows(void) +{ + // Input (DDR:0, PORT:0) + DDRD &= ~0b00101111; + PORTD &= ~0b00101111; + DDRB &= ~(1<<7); + PORTB &= ~(1<<7); + + // Input with pull-up (DDR:0, PORT:1) + DDRE &= ~(1<<2); + PORTE |= (1<<2); +} + +static uint8_t read_rows(void) +{ + return (PIND&(1<<0) ? (1<<0) : 0) | + (PIND&(1<<1) ? (1<<1) : 0) | + (PIND&(1<<2) ? (1<<2) : 0) | + (PIND&(1<<3) ? (1<<3) : 0) | + (PIND&(1<<5) ? (1<<4) : 0) | + (PINB&(1<<7) ? (1<<5) : 0); +} + +static uint8_t read_caps(void) +{ + return PINE&(1<<2) ? 0 : (1<<3); +} + +/* Columns 0 - 15 + * These columns uses two 74HC237D 3 to 8 bit demultiplexers. + * col / pin: PC6 PB6 PF0 PF1 PC7 + * 0: 1 0 0 0 0 + * 1: 1 0 1 0 0 + * 2: 1 0 0 1 0 + * 3: 1 0 1 1 0 + * 4: 1 0 0 0 1 + * 5: 1 0 1 0 1 + * 6: 1 0 0 1 1 + * 7: 1 0 1 1 1 + * 8: 0 1 0 0 0 + * 9: 0 1 1 0 0 + * 10: 0 1 0 1 0 + * 11: 0 1 1 1 0 + * 12: 0 1 0 0 1 + * 13: 0 1 1 0 1 + * 14: 0 1 0 1 1 + * 15: 0 1 1 1 1 + * + * col: 16 + * pin: PB5 + */ +static void unselect_cols(void) +{ + DDRB |= (1<<5) | (1<<6); + PORTB &= ~((1<<5) | (1<<6)); + + DDRC |= (1<<6) | (1<<7); + PORTC &= ~((1<<6) | (1<<7)); + + DDRF |= (1<<0) | (1<<1); + PORTF &= ~((1<<0) | (1<<1)); +} + +static void select_col(uint8_t col) +{ + // Output high (DDR:1, PORT:1) to select + switch (col) { + case 0: + PORTC |= (1<<6); + break; + case 1: + PORTC |= (1<<6); + PORTF |= (1<<0); + break; + case 2: + PORTC |= (1<<6); + PORTF |= (1<<1); + break; + case 3: + PORTC |= (1<<6); + PORTF |= (1<<0) | (1<<1); + break; + case 4: + PORTC |= (1<<6); + PORTC |= (1<<7); + break; + case 5: + PORTC |= (1<<6); + PORTF |= (1<<0); + PORTC |= (1<<7); + break; + case 6: + PORTC |= (1<<6); + PORTF |= (1<<1); + PORTC |= (1<<7); + break; + case 7: + PORTC |= (1<<6); + PORTF |= (1<<0) | (1<<1); + PORTC |= (1<<7); + break; + case 8: + PORTB |= (1<<6); + break; + case 9: + PORTB |= (1<<6); + PORTF |= (1<<0); + break; + case 10: + PORTB |= (1<<6); + PORTF |= (1<<1); + break; + case 11: + PORTB |= (1<<6); + PORTF |= (1<<0) | (1<<1); + break; + case 12: + PORTB |= (1<<6); + PORTC |= (1<<7); + break; + case 13: + PORTB |= (1<<6); + PORTF |= (1<<0); + PORTC |= (1<<7); + break; + case 14: + PORTB |= (1<<6); + PORTF |= (1<<1); + PORTC |= (1<<7); + break; + case 15: + PORTB |= (1<<6); + PORTF |= (1<<0) | (1<<1); + PORTC |= (1<<7); + break; + case 16: + PORTB |= (1<<5); + break; + } +} |