155 lines
3.2 KiB
C
155 lines
3.2 KiB
C
/*
|
|
* scan matrix
|
|
*/
|
|
#include <avr/io.h>
|
|
#include <util/delay.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];
|
|
|
|
|
|
static bool matrix_has_ghost_in_row(int row);
|
|
static int bit_pop(uint8_t bits);
|
|
|
|
|
|
inline
|
|
int matrix_rows(void)
|
|
{
|
|
return MATRIX_ROWS;
|
|
}
|
|
|
|
inline
|
|
int matrix_cols(void)
|
|
{
|
|
return MATRIX_COLS;
|
|
}
|
|
|
|
// 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] = 0x00;
|
|
for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
|
|
matrix = _matrix0;
|
|
matrix_prev = _matrix1;
|
|
}
|
|
|
|
int 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<<col);
|
|
} else {
|
|
matrix[row] &= ~(1<<col);
|
|
}
|
|
KEY_UNABLE;
|
|
_delay_us(150); // from logic analyzer chart
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
bool matrix_is_modified(void)
|
|
{
|
|
for (int i = 0; i < MATRIX_ROWS; i++) {
|
|
if (matrix[i] != matrix_prev[i])
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
inline
|
|
bool matrix_has_ghost(void)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
inline
|
|
bool matrix_is_on(int row, int col)
|
|
{
|
|
return (matrix[row] & (1<<col));
|
|
}
|
|
|
|
inline
|
|
uint16_t matrix_get_row(int row)
|
|
{
|
|
return matrix[row];
|
|
}
|
|
|
|
void matrix_print(void)
|
|
{
|
|
print("\nr/c 01234567\n");
|
|
for (int row = 0; row < matrix_rows(); row++) {
|
|
phex(row); print(": ");
|
|
pbin_reverse(matrix_get_row(row));
|
|
if (matrix_has_ghost_in_row(row)) {
|
|
print(" <ghost");
|
|
}
|
|
print("\n");
|
|
}
|
|
}
|
|
|
|
int matrix_key_count(void)
|
|
{
|
|
int count = 0;
|
|
for (int i = 0; i < MATRIX_ROWS; i++) {
|
|
count += bit_pop(matrix[i]);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
inline
|
|
static bool matrix_has_ghost_in_row(int row)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
inline
|
|
static int bit_pop(uint8_t bits)
|
|
{
|
|
int c;
|
|
for (c = 0; bits; c++)
|
|
bits &= bits -1;
|
|
return c;
|
|
}
|