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-rw-r--r--keyboard/kmac/matrix.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/keyboard/kmac/matrix.c b/keyboard/kmac/matrix.c
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+/*
+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;
+ }
+}