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Diffstat (limited to 'keyboards/kmac/matrix.c')
| -rw-r--r-- | keyboards/kmac/matrix.c | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/keyboards/kmac/matrix.c b/keyboards/kmac/matrix.c new file mode 100644 index 0000000000..bab638bdfa --- /dev/null +++ b/keyboards/kmac/matrix.c @@ -0,0 +1,311 @@ +/* +Copyright 2017 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> +#if defined(__AVR__) +#include <avr/io.h> +#endif +#include "wait.h" +#include "print.h" +#include "debug.h" +#include "util.h" +#include "matrix.h" +#include "timer.h" + + +/* Set 0 if debouncing isn't needed */ +#ifndef DEBOUNCING_DELAY +# define DEBOUNCING_DELAY 5 +#endif + +#define COL_SHIFTER ((uint32_t)1) + +static uint16_t debouncing_time; +static bool debouncing = false; + + +static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS; + +/* matrix state(1:on, 0:off) */ +static matrix_row_t matrix[MATRIX_ROWS]; +static matrix_row_t matrix_debouncing[MATRIX_ROWS]; + +static void init_rows(void); +static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col); +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; + } + + matrix_init_quantum(); +} + +uint8_t matrix_scan(void) +{ + // Set col, read rows + for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) { + bool matrix_changed = read_rows_on_col(matrix_debouncing, current_col); + if (matrix_changed) { + debouncing = true; + debouncing_time = timer_read(); + } + } + + if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) { + for (uint8_t i = 0; i < MATRIX_ROWS; i++) { + matrix[i] = matrix_debouncing[i]; + } + debouncing = false; + } + + matrix_scan_quantum(); + return 1; +} + +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 0123456789ABCDEFGHIJKLMNOPQRSTUV\n"); + + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + phex(row); print(": "); + print_bin_reverse32(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 += bitpop32(matrix[i]); + } + return count; +} + +static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col) +{ + bool matrix_changed = false; + + // Select col and wait for col selecton to stabilize + select_col(current_col); + wait_us(30); + + // For each row... + for(uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++) + { + // Store last value of row prior to reading + matrix_row_t last_row_value = current_matrix[row_index]; + + // Check row pin state + // Use the otherwise unused row: 3, col: 0 for caps lock + if (row_index == 3 && current_col == 0) { + // Pin E2 uses active low + if ((_SFR_IO8(E2 >> 4) & _BV(E2 & 0xF)) == 0) + { + // Pin LO, set col bit + current_matrix[row_index] |= (COL_SHIFTER << current_col); + } + else + { + // Pin HI, clear col bit + current_matrix[row_index] &= ~(COL_SHIFTER << current_col); + } + } + else { + if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF))) + { + // Pin HI, set col bit + current_matrix[row_index] |= (COL_SHIFTER << current_col); + } + else + { + // Pin LO, clear col bit + current_matrix[row_index] &= ~(COL_SHIFTER << current_col); + } + } + + // Determine if the matrix changed state + if ((last_row_value != current_matrix[row_index]) && !(matrix_changed)) + { + matrix_changed = true; + } + } + + // Unselect cols + unselect_cols(); + + return matrix_changed; +} + +/* Row pin configuration + * row: 0 1 2 3 4 5 + * pin: D0 D1 D2 D3 D5 B7 + * + * Caps lock uses its own pin E2 + */ +static void init_rows(void) +{ + DDRD &= ~((1<<0)| (1<<1) | (1<<2) | (1<<3) | (1<<5)); // IN + PORTD &= ~((1<<0)| (1<<1) | (1<<2) | (1<<3) | (1<<5)); // LO + DDRB &= ~(1<<7); // IN + PORTB &= ~(1<<7); // LO + + DDRE &= ~(1<<2); // IN + PORTE |= (1<<2); // HI +} + +/* 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); // OUT + PORTB &= ~((1<<5) | (1<<6)); // LO + + DDRC |= (1<<6) | (1<<7); // OUT + PORTC &= ~((1<<6) | (1<<7)); // LO + + DDRF |= (1<<0) | (1<<1); // OUT + PORTF &= ~((1<<0) | (1<<1)); // LO +} + +static void select_col(uint8_t col) +{ + switch (col) { + case 0: + PORTC |= (1<<6); // HI + break; + case 1: + PORTC |= (1<<6); // HI + PORTF |= (1<<0); // HI + break; + case 2: + PORTC |= (1<<6); // HI + PORTF |= (1<<1); // HI + break; + case 3: + PORTC |= (1<<6); // HI + PORTF |= (1<<0) | (1<<1); // HI + break; + case 4: + PORTC |= (1<<6); // HI + PORTC |= (1<<7); // HI + break; + case 5: + PORTC |= (1<<6); // HI + PORTF |= (1<<0); // HI + PORTC |= (1<<7); // HI + break; + case 6: + PORTC |= (1<<6); // HI + PORTF |= (1<<1); // HI + PORTC |= (1<<7); // HI + break; + case 7: + PORTC |= (1<<6); // HI + PORTF |= (1<<0) | (1<<1); // HI + PORTC |= (1<<7); // HI + break; + case 8: + PORTB |= (1<<6); // HI + break; + case 9: + PORTB |= (1<<6); // HI + PORTF |= (1<<0); // HI + break; + case 10: + PORTB |= (1<<6); // HI + PORTF |= (1<<1); // HI + break; + case 11: + PORTB |= (1<<6); // HI + PORTF |= (1<<0) | (1<<1); // HI + break; + case 12: + PORTB |= (1<<6); // HI + PORTC |= (1<<7); // HI + break; + case 13: + PORTB |= (1<<6); // HI + PORTF |= (1<<0); // HI + PORTC |= (1<<7); // HI + break; + case 14: + PORTB |= (1<<6); // HI + PORTF |= (1<<1); // HI + PORTC |= (1<<7); // HI + break; + case 15: + PORTB |= (1<<6); // HI + PORTF |= (1<<0) | (1<<1); // HI + PORTC |= (1<<7); // HI + break; + case 16: + PORTB |= (1<<5); // HI + break; + } +} |