+/*
+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 "matrix_skel.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
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 is active low. (key on: 0/key off: 1)
+// Matrix I/O ports
//
-// HHKB has no ghost and no bounce.
-// row: HC4051 select input channel(0-8)
-// PB0, PB1, PB2(A, B, C)
-// col: LS145 select low output line(0-8)
-// PB3, PB4, PB5, PB6(A, B, C, D)
-// use D as ENABLE: (enable: 0/unenable: 1)
-// key: KEY: (on: 0/ off:1)
-// KEY_PREV: (on: 1/ off: 0)
-// PE6,PE7(KEY, KEY_PREV)
-#define COL_ENABLE (1<<6)
-#define KEY_SELELCT(ROW, COL) (PORTB = (PORTB&(1<<7))|COL_ENABLE|(((COL)&0x07)<<3)|((ROW)&0x07))
-#define KEY_ENABLE (PORTB &= ~COL_ENABLE)
-#define KEY_UNABLE (PORTB |= COL_ENABLE)
-#define KEY_STATE (PINE&(1<<6))
-#define KEY_PREV_ON (PORTE |= (1<<7))
-#define KEY_PREV_OFF (PORTE &= ~(1<<7))
+// 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
void matrix_init(void)
{
- // row & col output(PB0-6)
- DDRB = 0xFF;
- KEY_SELELCT(0, 0);
- // KEY: input with pullup(PE6)
- // KEY_PREV: output(PE7)
- DDRE = 0xBF;
- PORTE = 0x40;
+ KEY_INIT();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
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_SELELCT(row, col);
- _delay_us(40); // from logic analyzer chart
+ 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;
+ KEY_PREV_ON();
}
- _delay_us(7); // from logic analyzer chart
- KEY_ENABLE;
- _delay_us(10); // from logic analyzer chart
- if (KEY_STATE) {
+ _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);
}
- KEY_PREV_OFF;
- KEY_UNABLE;
- _delay_us(150); // from logic analyzer chart
+
+ // 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;
}
projects / max / tmk_keyboard.git / blobdiff