312 lines
8 KiB
C
312 lines
8 KiB
C
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/*
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Copyright 2017 Mathias Andersson <wraul@dbox.se>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#if defined(__AVR__)
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#include <avr/io.h>
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#endif
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#include "wait.h"
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#include "timer.h"
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/* Set 0 if debouncing isn't needed */
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#ifndef DEBOUNCING_DELAY
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# define DEBOUNCING_DELAY 5
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#endif
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#define COL_SHIFTER ((uint32_t)1)
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static uint16_t debouncing_time;
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static bool debouncing = false;
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static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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/* matrix state(1:on, 0:off) */
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static matrix_row_t matrix[MATRIX_ROWS];
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static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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static void init_rows(void);
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
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static void unselect_cols(void);
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static void select_col(uint8_t col);
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inline
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uint8_t matrix_rows(void) {
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void) {
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return MATRIX_COLS;
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}
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void matrix_init(void) {
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unselect_cols();
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init_rows();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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matrix_debouncing[i] = 0;
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}
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matrix_init_quantum();
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}
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uint8_t matrix_scan(void)
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{
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// Set col, read rows
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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bool matrix_changed = read_rows_on_col(matrix_debouncing, current_col);
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if (matrix_changed) {
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debouncing = true;
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debouncing_time = timer_read();
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}
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}
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if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debouncing[i];
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}
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debouncing = false;
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}
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matrix_scan_quantum();
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return 1;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & ((matrix_row_t)1<col));
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 0123456789ABCDEFGHIJKLMNOPQRSTUV\n");
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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phex(row); print(": ");
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print_bin_reverse32(matrix_get_row(row));
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print("\n");
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}
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}
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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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count += bitpop32(matrix[i]);
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}
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return count;
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}
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
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{
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bool matrix_changed = false;
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// Select col and wait for col selecton to stabilize
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select_col(current_col);
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wait_us(30);
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// For each row...
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for(uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++)
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{
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[row_index];
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// Check row pin state
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// Use the otherwise unused row: 3, col: 0 for caps lock
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if (row_index == 3 && current_col == 0) {
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// Pin E2 uses active low
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if ((_SFR_IO8(E2 >> 4) & _BV(E2 & 0xF)) == 0)
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{
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// Pin LO, set col bit
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current_matrix[row_index] |= (COL_SHIFTER << current_col);
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}
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else
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{
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// Pin HI, clear col bit
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current_matrix[row_index] &= ~(COL_SHIFTER << current_col);
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}
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}
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else {
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if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)))
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{
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// Pin HI, set col bit
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current_matrix[row_index] |= (COL_SHIFTER << current_col);
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}
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else
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{
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// Pin LO, clear col bit
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current_matrix[row_index] &= ~(COL_SHIFTER << current_col);
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}
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}
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// Determine if the matrix changed state
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if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
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{
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matrix_changed = true;
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}
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}
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// Unselect cols
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unselect_cols();
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return matrix_changed;
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}
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/* Row pin configuration
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* row: 0 1 2 3 4 5
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* pin: D0 D1 D2 D3 D5 B7
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*
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* Caps lock uses its own pin E2
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*/
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static void init_rows(void)
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{
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DDRD &= ~((1<<0)| (1<<1) | (1<<2) | (1<<3) | (1<<5)); // IN
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PORTD &= ~((1<<0)| (1<<1) | (1<<2) | (1<<3) | (1<<5)); // LO
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DDRB &= ~(1<<7); // IN
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PORTB &= ~(1<<7); // LO
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DDRE &= ~(1<<2); // IN
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PORTE |= (1<<2); // HI
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}
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/* Columns 0 - 15
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* These columns uses two 74HC237D 3 to 8 bit demultiplexers.
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* col / pin: PC6 PB6 PF0 PF1 PC7
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* 0: 1 0 0 0 0
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* 1: 1 0 1 0 0
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* 2: 1 0 0 1 0
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* 3: 1 0 1 1 0
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* 4: 1 0 0 0 1
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* 5: 1 0 1 0 1
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* 6: 1 0 0 1 1
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* 7: 1 0 1 1 1
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* 8: 0 1 0 0 0
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* 9: 0 1 1 0 0
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* 10: 0 1 0 1 0
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* 11: 0 1 1 1 0
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* 12: 0 1 0 0 1
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* 13: 0 1 1 0 1
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* 14: 0 1 0 1 1
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* 15: 0 1 1 1 1
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*
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* col: 16
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* pin: PB5
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*/
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static void unselect_cols(void)
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{
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DDRB |= (1<<5) | (1<<6); // OUT
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PORTB &= ~((1<<5) | (1<<6)); // LO
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DDRC |= (1<<6) | (1<<7); // OUT
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PORTC &= ~((1<<6) | (1<<7)); // LO
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DDRF |= (1<<0) | (1<<1); // OUT
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PORTF &= ~((1<<0) | (1<<1)); // LO
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}
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static void select_col(uint8_t col)
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{
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switch (col) {
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case 0:
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PORTC |= (1<<6); // HI
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break;
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case 1:
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PORTC |= (1<<6); // HI
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PORTF |= (1<<0); // HI
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break;
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case 2:
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PORTC |= (1<<6); // HI
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PORTF |= (1<<1); // HI
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break;
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case 3:
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PORTC |= (1<<6); // HI
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PORTF |= (1<<0) | (1<<1); // HI
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break;
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case 4:
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PORTC |= (1<<6); // HI
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PORTC |= (1<<7); // HI
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break;
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case 5:
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PORTC |= (1<<6); // HI
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PORTF |= (1<<0); // HI
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PORTC |= (1<<7); // HI
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break;
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case 6:
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PORTC |= (1<<6); // HI
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PORTF |= (1<<1); // HI
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PORTC |= (1<<7); // HI
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break;
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case 7:
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PORTC |= (1<<6); // HI
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PORTF |= (1<<0) | (1<<1); // HI
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PORTC |= (1<<7); // HI
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break;
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case 8:
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PORTB |= (1<<6); // HI
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break;
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case 9:
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PORTB |= (1<<6); // HI
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PORTF |= (1<<0); // HI
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break;
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case 10:
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PORTB |= (1<<6); // HI
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PORTF |= (1<<1); // HI
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break;
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case 11:
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PORTB |= (1<<6); // HI
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PORTF |= (1<<0) | (1<<1); // HI
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break;
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case 12:
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PORTB |= (1<<6); // HI
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PORTC |= (1<<7); // HI
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break;
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case 13:
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PORTB |= (1<<6); // HI
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PORTF |= (1<<0); // HI
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PORTC |= (1<<7); // HI
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break;
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case 14:
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PORTB |= (1<<6); // HI
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PORTF |= (1<<1); // HI
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PORTC |= (1<<7); // HI
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break;
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case 15:
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PORTB |= (1<<6); // HI
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PORTF |= (1<<0) | (1<<1); // HI
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PORTC |= (1<<7); // HI
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break;
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case 16:
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PORTB |= (1<<5); // HI
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break;
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}
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}
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