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Diffstat (limited to 'keyboard/kitten_paw/matrix.c')
| -rw-r--r-- | keyboard/kitten_paw/matrix.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/keyboard/kitten_paw/matrix.c b/keyboard/kitten_paw/matrix.c new file mode 100644 index 000000000..08d64c5f4 --- /dev/null +++ b/keyboard/kitten_paw/matrix.c @@ -0,0 +1,239 @@ +/* +Copyright 2014 Ralf Schmitt <ralf@bunkertor.net> + +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; + +static matrix_row_t matrix[MATRIX_ROWS]; +static matrix_row_t matrix_debouncing[MATRIX_ROWS]; + +static uint8_t read_rows(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(); + 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++) { + select_col(col); + _delay_us(3); + uint8_t rows = read_rows(); + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + 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); + 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 6 7 + * pin: PC2 PB1 PB2 PB3 PC7 PB4 PB5 PB6 + * + */ +static void init_rows(void) +{ + DDRC &= ~0b10000100; + DDRB &= ~0b01111110; + PORTC |= 0b10000100; + PORTB |= 0b01111110; +} + +static uint8_t read_rows(void) +{ + return (PINC&(1<<2) ? 0 : (1<<0)) | + (PINB&(1<<1) ? 0 : (1<<1)) | + (PINB&(1<<2) ? 0 : (1<<2)) | + (PINB&(1<<3) ? 0 : (1<<3)) | + (PINC&(1<<7) ? 0 : (1<<4)) | + (PINB&(1<<4) ? 0 : (1<<5)) | + (PINB&(1<<5) ? 0 : (1<<6)) | + (PINB&(1<<6) ? 0 : (1<<7)); +} + +/* These columns uses two 74HC42 4 to 10 bit demultiplexers (low active). + * + * COL PD1 PD0 PD2 PD6 PD5 PD4 + * 12 1 1 0 0 0 0 + * 11 1 1 0 0 0 1 + * 10 1 1 0 0 1 0 + * 9 1 1 0 0 1 1 + * 8 1 1 0 1 0 0 + * 7 1 1 0 1 0 1 + * 6 1 1 0 1 1 0 + * 5 1 1 0 1 1 1 + * 4 1 1 1 0 0 0 + * 3 1 1 1 0 0 1 + + * COL PD2 PD6 PD1 PD0 PD5 PD4 + * 2 1 1 0 0 0 0 + * 1 1 1 0 0 0 1 + * 0 1 1 0 0 1 0 + * 17 1 1 0 0 1 1 + * 16 1 1 0 1 0 0 + * 1 1 0 1 0 1 + * 1 1 0 1 1 0 + * 15 1 1 0 1 1 1 + * 14 1 1 1 0 0 0 + * 13 1 1 1 0 0 1 + */ +static void unselect_cols(void) +{ + DDRD |= 0b01110111; + PORTD &= ~0b01110111; +} + +static void select_col(uint8_t col) +{ + switch (col) { + case 0: + PORTD |= (1<<5) | (1<<6) | (1<<2); + break; + case 1: + PORTD |= (1<<4) | (1<<6) | (1<<2); + break; + case 2: + PORTD |= (1<<6) | (1<<2); + break; + case 3: + PORTD |= (1<<4) | (1<<2) | (1<<0) | (1<<1); + break; + case 4: + PORTD |= (1<<2) | (1<<0) | (1<<1); + break; + case 5: + PORTD |= (1<<4) | (1<<5) | (1<<6) | (1<<0) | (1<<1); + break; + case 6: + PORTD |= (1<<5) | (1<<6) | (1<<0) | (1<<1); + break; + case 7: + PORTD |= (1<<4) | (1<<6) | (1<<0) | (1<<1); + break; + case 8: + PORTD |= (1<<6) | (1<<0) | (1<<1); + break; + case 9: + PORTD |= (1<<4) | (1<<5) | (1<<0) | (1<<1); + break; + case 10: + PORTD |= (1<<5) | (1<<0) | (1<<1); + break; + case 11: + PORTD |= (1<<4) | (1<<0) | (1<<1); + break; + case 12: + PORTD |= (1<<0) | (1<<1); + break; + case 13: + PORTD |= (1<<4) | (1<<1) | (1<<6) | (1<<2); + break; + case 14: + PORTD |= (1<<1) | (1<<6) | (1<<2); + break; + case 15: + PORTD |= (1<<4) | (1<<5) | (1<<0) | (1<<6) | (1<<2); + break; + case 16: + PORTD |= (1<<0) | (1<<6) | (1<<2); + break; + case 17: + PORTD |= (1<<4) | (1<<5) | (1<<6) | (1<<2); + break; + } +} |