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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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