From 54b5bafaacf0d7863b7bdb84dd69cbc80db77956 Mon Sep 17 00:00:00 2001 From: tmk Date: Thu, 14 Oct 2010 17:36:00 +0900 Subject: add directories for each keyboard: hhkb, macway --- hhkb/matrix.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 hhkb/matrix.c (limited to 'hhkb/matrix.c') diff --git a/hhkb/matrix.c b/hhkb/matrix.c new file mode 100644 index 000000000..3034a6361 --- /dev/null +++ b/hhkb/matrix.c @@ -0,0 +1,91 @@ +/* + * scan matrix + */ +#include +#include +#include "keymap.h" +#include "matrix.h" +#include "print.h" + +// matrix is active low. (key on: 0/key off: 1) +// +// 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) +// UNKNOWN: unknown whether input or output +// PE6,PE7(KEY, UNKNOWN) +#define COL_ENABLE (1<<6) +#define KEY_SELELCT(ROW, COL) (PORTB = COL_ENABLE|(((COL)&0x07)<<3)|((ROW)&0x07)) +#define KEY_ENABLE (PORTB &= ~COL_ENABLE) +#define KEY_UNABLE (PORTB |= COL_ENABLE) +#define KEY_ON ((PINE&(1<<6)) ? false : true) + +// matrix state buffer +uint8_t *matrix; +uint8_t *matrix_prev; +static uint8_t _matrix0[MATRIX_ROWS]; +static uint8_t _matrix1[MATRIX_ROWS]; + + +// this must be called once before matrix_scan. +void matrix_init(void) +{ + // row & col output(PB0-6) + DDRB = 0xFF; + PORTB = KEY_SELELCT(0, 0); + // KEY & VALID input with pullup(PE6,7) + DDRE = 0x3F; + PORTE = 0xC0; + + // initialize matrix state: all keys off + for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0xFF; + for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0xFF; + matrix = _matrix0; + matrix_prev = _matrix1; +} + +uint8_t matrix_scan(void) +{ + uint8_t *tmp; + + tmp = matrix_prev; + matrix_prev = matrix; + matrix = tmp; + + for (int row = 0; row < MATRIX_ROWS; row++) { + for (int col = 0; col < MATRIX_COLS; col++) { + KEY_SELELCT(row, col); + _delay_us(50); // from logic analyzer chart + KEY_ENABLE; + _delay_us(10); // from logic analyzer chart + if (KEY_ON) { + matrix[row] &= ~(1<