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