140 lines
3.1 KiB
C
140 lines
3.1 KiB
C
/*
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* scan matrix
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*/
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#include <avr/io.h>
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#include <util/delay.h>
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#include "keymap.h"
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#include "matrix.h"
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#include "print.h"
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// matrix is active low. (key on: 0/key off: 1)
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//
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// HHKB has no ghost and no bounce.
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// row: HC4051 select input channel(0-8)
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// PB0, PB1, PB2(A, B, C)
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// col: LS145 select low output line(0-8)
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// PB3, PB4, PB5, PB6(A, B, C, D)
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// use D as ENABLE: (enable: 0/unenable: 1)
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// key: KEY: (on: 0/ off:1)
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// UNKNOWN: unknown whether input or output
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// PE6,PE7(KEY, UNKNOWN)
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#define COL_ENABLE (1<<6)
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#define KEY_SELELCT(ROW, COL) (PORTB = COL_ENABLE|(((COL)&0x07)<<3)|((ROW)&0x07))
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#define KEY_ENABLE (PORTB &= ~COL_ENABLE)
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#define KEY_UNABLE (PORTB |= COL_ENABLE)
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#define KEY_ON ((PINE&(1<<6)) ? false : true)
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// matrix state buffer
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uint8_t *matrix;
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uint8_t *matrix_prev;
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static uint8_t _matrix0[MATRIX_ROWS];
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static uint8_t _matrix1[MATRIX_ROWS];
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static bool matrix_has_ghost_in_row(int row);
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static int bit_pop(uint8_t bits);
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inline
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int matrix_rows(void) {
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return MATRIX_ROWS;
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}
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inline
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int matrix_cols(void) {
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return MATRIX_COLS;
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}
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// this must be called once before matrix_scan.
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void matrix_init(void)
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{
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// row & col output(PB0-6)
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DDRB = 0xFF;
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PORTB = KEY_SELELCT(0, 0);
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// KEY & VALID input with pullup(PE6,7)
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DDRE = 0x3F;
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PORTE = 0xC0;
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// initialize matrix state: all keys off
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for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0xFF;
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for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0xFF;
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matrix = _matrix0;
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matrix_prev = _matrix1;
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}
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int matrix_scan(void)
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{
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uint8_t *tmp;
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tmp = matrix_prev;
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matrix_prev = matrix;
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matrix = tmp;
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for (int row = 0; row < MATRIX_ROWS; row++) {
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for (int col = 0; col < MATRIX_COLS; col++) {
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KEY_SELELCT(row, col);
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_delay_us(50); // from logic analyzer chart
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KEY_ENABLE;
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_delay_us(10); // from logic analyzer chart
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if (KEY_ON) {
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matrix[row] &= ~(1<<col);
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} else {
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matrix[row] |= (1<<col);
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}
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KEY_UNABLE;
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_delay_us(150); // from logic analyzer chart
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}
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}
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return 1;
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}
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bool matrix_is_modified(void) {
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for (int i = 0; i < MATRIX_ROWS; i++) {
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if (matrix[i] != matrix_prev[i])
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return true;
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}
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return false;
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}
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inline
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bool matrix_has_ghost(void) {
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return false;
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}
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inline
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uint16_t matrix_get_row(int row) {
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return matrix[row];
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}
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void matrix_print(void) {
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print("\nr/c 01234567\n");
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for (int row = 0; row < matrix_rows(); row++) {
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phex(row); print(": ");
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pbin_reverse(matrix_get_row(row));
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if (matrix_has_ghost_in_row(row)) {
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print(" <ghost");
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}
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print("\n");
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}
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}
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int matrix_key_count(void) {
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int count = 0;
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for (int i = 0; i < MATRIX_ROWS; i++) {
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count += bit_pop(~matrix[i]);
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}
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return count;
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}
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inline
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static bool matrix_has_ghost_in_row(int row) {
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return false;
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}
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static int bit_pop(uint8_t bits) {
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int c;
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for (c = 0; bits; c++)
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bits &= bits -1;
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return c;
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}
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