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Diffstat (limited to 'keyboard/nerd/matrix.c')
| -rw-r--r-- | keyboard/nerd/matrix.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/keyboard/nerd/matrix.c b/keyboard/nerd/matrix.c new file mode 100644 index 000000000..eb5a9ab4f --- /dev/null +++ b/keyboard/nerd/matrix.c @@ -0,0 +1,221 @@ +/* +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" +#include "backlight.h" + + +#ifndef DEBOUNCE +# define DEBOUNCE 5 +#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 uint16_t read_inputs(void); +static void init_inputs(void); +static void init_outputs(void); +static void reset_inputs(void); +static void reset_outputs(void); +static void select_output(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) +{ + backlight_init_ports(); + init_inputs(); + init_outputs(); + + 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++) { + reset_inputs(); + reset_outputs(); + select_output(col); + _delay_us(3); + uint16_t rows = read_inputs(); + 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); + if (debouncing) { + dprint("bounce!: "); dprintf("%02X", debouncing); dprintln(); + } + debouncing = DEBOUNCE; + } + } + } + + 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++) { + phex(row); print(": "); + pbin_reverse16(matrix_get_row(row)); + print("\n"); + } +} + +uint8_t matrix_key_count(void) +{ + uint8_t count = 0; + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + count += bitpop16(matrix[i]); + } + return count; +} + +static void init_inputs(void) +{ + DDRE &= ~0b01000000; // PE6 (Col 0) + DDRB &= ~0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4) + DDRF &= ~0b00000001; // PF0 (Col 5) + DDRD &= ~0b00100011; // PD0 (Col 6), PD1 (Col 8 TKL), PD5 (Col 7) +} + +static uint16_t read_inputs(void) +{ + return (PINE&(1<<6) ? 0 : (1<<0)) | // PE6 (Col 0) + (PINB&(1<<0) ? 0 : (1<<1)) | // PB0 (Col 1) + (PINB&(1<<1) ? 0 : (1<<2)) | // PB1 (Col 2) + (PINB&(1<<2) ? 0 : (1<<3)) | // PB2 (Col 3) + (PINB&(1<<3) ? 0 : (1<<4)) | // PB3 (Col 4) + (PINF&(1<<0) ? 0 : (1<<5)) | // PF0 (Col 5) + (PIND&(1<<0) ? 0 : (1<<6)) | // PD0 (Col 6) + (PIND&(1<<5) ? 0 : (1<<7)) | // PD5 (Col 7) + (PIND&(1<<1) ? 0 : (1<<8)); // PD1 (Col 8 TKL) +} + +static void reset_inputs(void) +{ + PORTE |= 0b01000000; // PE6 (Col 0) + PORTB |= 0b00001111; // PB0 (Col 1), PB1 (Col 2), PB2 (Col 3), PB3 (Col 4) + PORTF |= 0b00000001; // PF0 (Col 5) + PORTD |= 0b00100011; // PD0 (Col 6), PD1 (Col 8 TKL), PD5 (Col 7) +} + +static void init_outputs(void) +{ + DDRB |= 0b00010000; // PB4 (Row 0) + DDRE |= 0b00000100; // PE2 (Row 1) + DDRF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7) + DDRC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9) + DDRD |= 0b10000000; // PD7 (Row 8) +} + +static void reset_outputs(void) +{ + PORTB |= 0b00010000; // PB4 (Row 0) + PORTE |= 0b00000100; // PE2 (Row 1) + PORTF |= 0b11110010; // PF4 (Row 2), PF7 (Row 3), PF1 (Row 4), PF6 (Row 5), PF5 (Row 7) + PORTC |= 0b11000000; // PC6 (Row 6), PC7 (Row 9) + PORTD |= 0b10000000; // PD7 (Row 8) +} + +static void select_output(uint8_t col) +{ + switch (col) { + case 0: + PORTB &= ~(1<<4); + break; + case 1: + PORTE &= ~(1<<2); + break; + case 2: + PORTF &= ~(1<<4); + break; + case 3: + PORTF &= ~(1<<7); + break; + case 4: + PORTF &= ~(1<<1); + break; + case 5: + PORTF &= ~(1<<6); + break; + case 6: + PORTC &= ~(1<<6); + break; + case 7: + PORTF &= ~(1<<5); + break; + case 8: + PORTD &= ~(1<<7); + break; + case 9: + PORTC &= ~(1<<7); + break; + } +} |