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/*
* scan matrix
*/
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include <util/delay.h>
#include "print.h"
#include "util.h"
#include "matrix_skel.h"
// matrix state buffer (key on: 1/key off: 0)
static uint8_t *matrix;
static uint8_t *matrix_prev;
static uint8_t _matrix0[MATRIX_ROWS];
static uint8_t _matrix1[MATRIX_ROWS];
static bool matrix_has_ghost_in_row(uint8_t row);
static uint8_t read_col(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
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)
{
// initialize row and col
unselect_rows();
// Input with pull-up(DDR:0, PORT:1)
DDRB = 0x00;
PORTB = 0xFF;
// 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 i = 0; i < MATRIX_ROWS; i++) {
unselect_rows();
select_row(i);
_delay_us(30); // without this wait read unstable value.
matrix[i] = ~read_col();
}
unselect_rows();
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;
}
bool matrix_has_ghost(void)
{
for (int i = 0; i < MATRIX_ROWS; i++) {
if (matrix_has_ghost_in_row(i))
return true;
}
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 += bitpop(matrix[i]);
}
return count;
}
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 (int i=0; i < MATRIX_ROWS; i++) {
if (i != row && (matrix[i] & matrix[row]) == matrix[row])
return true;
}
return false;
}
static uint8_t read_col(void)
{
return PINB;
}
static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
DDRC &= ~0b11000000; // PC: 7,6
PORTC &= ~0b11000000;
DDRD &= ~0b11000111; // PD: 7,6,2,1,0
PORTD &= ~0b11000111;
DDRF &= ~0b11000000; // PF: 7,6
PORTF &= ~0b11000000;
}
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
// row: 0 1 2 3 4 5 6 7 8
// pin: PD0, PC7, PD7, PF6, PD6, PD1, PD2, PC6, PF7
switch (row) {
case 0:
DDRD |= (1<<0);
PORTD &= ~(1<<0);
break;
case 1:
DDRC |= (1<<7);
PORTC &= ~(1<<7);
break;
case 2:
DDRD |= (1<<7);
PORTD &= ~(1<<7);
break;
case 3:
DDRF |= (1<<6);
PORTF &= ~(1<<6);
break;
case 4:
DDRD |= (1<<6);
PORTD &= ~(1<<6);
break;
case 5:
DDRD |= (1<<1);
PORTD &= ~(1<<1);
break;
case 6:
DDRD |= (1<<2);
PORTD &= ~(1<<2);
break;
case 7:
DDRC |= (1<<6);
PORTC &= ~(1<<6);
break;
case 8:
DDRF |= (1<<7);
PORTF &= ~(1<<7);
break;
}
}
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