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/*
Copyright 2012 Jun Wako <wakojun@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ch.h"
#include "hal.h"
/*
* scan matrix
*/
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "wait.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
static uint8_t debouncing = DEBOUNCE;
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static matrix_row_t read_cols(void);
static void init_cols(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
inline
uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
#define LED_ON() do { palSetPad(GPIOC, GPIOC_LED_BLUE) ;} while (0)
#define LED_OFF() do { palClearPad(GPIOC, GPIOC_LED_BLUE); } while (0)
#define LED_TGL() do { palTogglePad(GPIOC, GPIOC_LED_BLUE); } while (0)
void matrix_init(void)
{
// initialize row and col
unselect_rows();
init_cols();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
//debug
debug_matrix = true;
LED_ON();
wait_ms(500);
LED_OFF();
}
uint8_t matrix_scan(void)
{
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
select_row(i);
wait_us(30); // without this wait read unstable value.
matrix_row_t cols = read_cols();
if (matrix_debouncing[i] != cols) {
matrix_debouncing[i] = cols;
if (debouncing) {
debug("bounce!: "); debug_hex(debouncing); debug("\n");
}
debouncing = DEBOUNCE;
}
unselect_rows();
}
if (debouncing) {
if (--debouncing) {
wait_ms(1);
} else {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
return 1;
}
inline
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix[row] & ((matrix_row_t)1<<col));
}
inline
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
void matrix_print(void)
{
print("\nr/c 0123456789ABCDEF\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
phex(row); print(": ");
pbin_reverse16(matrix_get_row(row));
print("\n");
}
}
/* Column pin configuration
*/
static void init_cols(void)
{
// don't need pullup/down, since it's pulled down in hardware
palSetPadMode(GPIOA, GPIOA_BUTTON, PAL_MODE_INPUT);
}
/* Returns status of switches(1:on, 0:off) */
static matrix_row_t read_cols(void)
{
return ((palReadPad(GPIOA, GPIOA_BUTTON)==PAL_LOW) ? 0 : (1<<0));
// | ((palReadPad(...)==PAL_HIGH) ? 0 : (1<<1))
}
/* Row pin configuration
*/
static void unselect_rows(void)
{
// palSetPadMode(GPIOA, GPIOA_PIN10, PAL_MODE_INPUT); // hi-Z
}
static void select_row(uint8_t row)
{
(void)row;
// Output low to select
// switch (row) {
// case 0:
// palSetPadMode(GPIOA, GPIOA_PIN10, PAL_MODE_OUTPUT_PUSHPULL);
// palSetPad(GPIOA, GPIOA_PIN10, PAL_LOW);
// break;
// }
}
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