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-rw-r--r--keyboard/hhkb/matrix.c294
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diff --git a/keyboard/hhkb/matrix.c b/keyboard/hhkb/matrix.c
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+/*
+Copyright 2011 Jun Wako <wakojun@gmail.com>
+
+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/>.
+*/
+
+/*
+ * scan matrix
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "print.h"
+#include "util.h"
+#include "timer.h"
+#include "matrix.h"
+
+
+// Timer resolution check
+#if (1000000/TIMER_RAW_FREQ > 20)
+# error "Timer resolution(>20us) is not enough for HHKB matrix scan tweak on V-USB."
+#endif
+
+#if (MATRIX_COLS > 16)
+# error "MATRIX_COLS must not exceed 16"
+#endif
+#if (MATRIX_ROWS > 255)
+# error "MATRIX_ROWS must not exceed 255"
+#endif
+
+
+// matrix state buffer(1:on, 0:off)
+#if (MATRIX_COLS <= 8)
+static uint8_t *matrix;
+static uint8_t *matrix_prev;
+static uint8_t _matrix0[MATRIX_ROWS];
+static uint8_t _matrix1[MATRIX_ROWS];
+#else
+static uint16_t *matrix;
+static uint16_t *matrix_prev;
+static uint16_t _matrix0[MATRIX_ROWS];
+static uint16_t _matrix1[MATRIX_ROWS];
+#endif
+
+// HHKB has no ghost and no bounce.
+#ifdef MATRIX_HAS_GHOST
+static bool matrix_has_ghost_in_row(uint8_t row);
+#endif
+
+
+// Matrix I/O ports
+//
+// row: HC4051[A,B,C] selects scan row0-7
+// col: LS145[A,B,C,D] selects scan col0-7 and enable(D)
+// key: on: 0/off: 1
+// prev: unknown: output previous key state(negated)?
+
+#ifdef HOST_PJRC
+// Ports for Teensy
+// row: PB0-2
+// col: PB3-5,6
+// key: PE6(pull-uped)
+// prev: PE7
+#define KEY_INIT() do { \
+ DDRB |= 0x7F; \
+ DDRE |= (1<<7); \
+ DDRE &= ~(1<<6); \
+ PORTE |= (1<<6); \
+} while (0)
+#define KEY_SELECT(ROW, COL) (PORTB = (PORTB & 0xC0) | \
+ (((COL) & 0x07)<<3) | \
+ ((ROW) & 0x07))
+#define KEY_ENABLE() (PORTB &= ~(1<<6))
+#define KEY_UNABLE() (PORTB |= (1<<6))
+#define KEY_STATE() (PINE & (1<<6))
+#define KEY_PREV_ON() (PORTE |= (1<<7))
+#define KEY_PREV_OFF() (PORTE &= ~(1<<7))
+#define KEY_POWER_ON()
+#define KEY_POWER_OFF()
+#else
+// Ports for V-USB
+// key: PB0(pull-uped)
+// prev: PB1
+// row: PB2-4
+// col: PC0-2,3
+// power: PB5(Low:on/Hi-z:off)
+#define KEY_INIT() do { \
+ DDRB |= 0x3E; \
+ DDRB &= ~(1<<0); \
+ PORTB |= 1<<0; \
+ DDRC |= 0x0F; \
+ KEY_UNABLE(); \
+ KEY_PREV_OFF(); \
+} while (0)
+#define KEY_SELECT(ROW, COL) do { \
+ PORTB = (PORTB & 0xE3) | ((ROW) & 0x07)<<2; \
+ PORTC = (PORTC & 0xF8) | ((COL) & 0x07); \
+} while (0)
+#define KEY_ENABLE() (PORTC &= ~(1<<3))
+#define KEY_UNABLE() (PORTC |= (1<<3))
+#define KEY_STATE() (PINB & (1<<0))
+#define KEY_PREV_ON() (PORTB |= (1<<1))
+#define KEY_PREV_OFF() (PORTB &= ~(1<<1))
+// Power supply switching
+#define KEY_POWER_ON() do { \
+ KEY_INIT(); \
+ PORTB &= ~(1<<5); \
+ _delay_us(200); \
+} while (0)
+#define KEY_POWER_OFF() do { \
+ DDRB &= ~0x3F; \
+ PORTB &= ~0x3F; \
+ DDRC &= ~0x0F; \
+ PORTC &= ~0x0F; \
+} while (0)
+#endif
+
+
+inline
+uint8_t matrix_rows(void)
+{
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+ return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+ KEY_INIT();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
+ matrix = _matrix0;
+ matrix_prev = _matrix1;
+}
+
+uint8_t matrix_scan(void)
+{
+ uint8_t *tmp;
+
+ tmp = matrix_prev;
+ matrix_prev = matrix;
+ matrix = tmp;
+
+ KEY_POWER_ON();
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+ for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+ KEY_SELECT(row, col);
+ _delay_us(40);
+
+ // Not sure this is needed. This just emulates HHKB controller's behaviour.
+ if (matrix_prev[row] & (1<<col)) {
+ KEY_PREV_ON();
+ }
+ _delay_us(7);
+
+ // NOTE: KEY_STATE is valid only in 20us after KEY_ENABLE.
+ // If V-USB interrupts in this section we could lose 40us or so
+ // and would read invalid value from KEY_STATE.
+ uint8_t last = TIMER_RAW;
+
+ KEY_ENABLE();
+ // Wait for KEY_STATE outputs its value.
+ // 1us was ok on one HHKB, but not worked on another.
+ _delay_us(10);
+ if (KEY_STATE()) {
+ matrix[row] &= ~(1<<col);
+ } else {
+ matrix[row] |= (1<<col);
+ }
+
+ // Ignore if this code region execution time elapses more than 20us.
+ if (TIMER_DIFF_RAW(TIMER_RAW, last) > 20/(1000000/TIMER_RAW_FREQ)) {
+ matrix[row] = matrix_prev[row];
+ }
+
+ KEY_PREV_OFF();
+ KEY_UNABLE();
+ // NOTE: KEY_STATE keep its state in 20us after KEY_ENABLE.
+ // This takes 25us or more to make sure KEY_STATE returns to idle state.
+ _delay_us(150);
+ }
+ }
+ KEY_POWER_OFF();
+ return 1;
+}
+
+bool matrix_is_modified(void)
+{
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ if (matrix[i] != matrix_prev[i])
+ return true;
+ }
+ return false;
+}
+
+inline
+bool matrix_has_ghost(void)
+{
+#ifdef MATRIX_HAS_GHOST
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ if (matrix_has_ghost_in_row(i))
+ return true;
+ }
+#endif
+ return false;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+ return (matrix[row] & (1<<col));
+}
+
+inline
+#if (MATRIX_COLS <= 8)
+uint8_t matrix_get_row(uint8_t row)
+#else
+uint16_t matrix_get_row(uint8_t row)
+#endif
+{
+ return matrix[row];
+}
+
+void matrix_print(void)
+{
+#if (MATRIX_COLS <= 8)
+ print("\nr/c 01234567\n");
+#else
+ print("\nr/c 0123456789ABCDEF\n");
+#endif
+ for (uint8_t row = 0; row < matrix_rows(); row++) {
+ phex(row); print(": ");
+#if (MATRIX_COLS <= 8)
+ pbin_reverse(matrix_get_row(row));
+#else
+ pbin_reverse16(matrix_get_row(row));
+#endif
+#ifdef MATRIX_HAS_GHOST
+ if (matrix_has_ghost_in_row(row)) {
+ print(" <ghost");
+ }
+#endif
+ print("\n");
+ }
+}
+
+uint8_t matrix_key_count(void)
+{
+ uint8_t count = 0;
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+#if (MATRIX_COLS <= 8)
+ count += bitpop(matrix[i]);
+#else
+ count += bitpop16(matrix[i]);
+#endif
+ }
+ return count;
+}
+
+#ifdef MATRIX_HAS_GHOST
+inline
+static bool matrix_has_ghost_in_row(uint8_t row)
+{
+ // no ghost exists in case less than 2 keys on
+ if (((matrix[row] - 1) & matrix[row]) == 0)
+ return false;
+
+ // ghost exists in case same state as other row
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+ if (i != row && (matrix[i] & matrix[row]) == matrix[row])
+ return true;
+ }
+ return false;
+}
+#endif
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