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+/*
+Copyright 2012 Jun Wako
+Copyright 2014 Jack Humbert
+
+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 <stdint.h>
+#include <stdbool.h>
+#if defined(__AVR__)
+#include <avr/io.h>
+#endif
+#include "wait.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+
+/* Set 0 if debouncing isn't needed */
+/*
+ * This constant define not debouncing time in msecs, but amount of matrix
+ * scan loops which should be made to get stable debounced results.
+ *
+ * On Ergodox matrix scan rate is relatively low, because of slow I2C.
+ * Now it's only 317 scans/second, or about 3.15 msec/scan.
+ * According to Cherry specs, debouncing time is 5 msec.
+ *
+ * And so, there is no sense to have DEBOUNCE higher than 2.
+ */
+
+#ifndef DEBOUNCING_DELAY
+# define DEBOUNCING_DELAY 5
+#endif
+static uint8_t debouncing = DEBOUNCING_DELAY;
+
+static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
+static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+#if DIODE_DIRECTION == ROW2COL
+ static matrix_row_t matrix_reversed[MATRIX_COLS];
+ static matrix_row_t matrix_reversed_debouncing[MATRIX_COLS];
+#endif
+
+#if MATRIX_COLS > 16
+ #define SHIFTER 1UL
+#else
+ #define SHIFTER 1
+#endif
+
+static matrix_row_t read_cols(void);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+__attribute__ ((weak))
+void matrix_init_quantum(void) {
+ matrix_init_kb();
+}
+
+__attribute__ ((weak))
+void matrix_scan_quantum(void) {
+ matrix_scan_kb();
+}
+
+__attribute__ ((weak))
+void matrix_init_kb(void) {
+ matrix_init_user();
+}
+
+__attribute__ ((weak))
+void matrix_scan_kb(void) {
+ matrix_scan_user();
+}
+
+__attribute__ ((weak))
+void matrix_init_user(void) {
+}
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {
+}
+
+inline
+uint8_t matrix_rows(void) {
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void) {
+ return MATRIX_COLS;
+}
+
+// void matrix_power_up(void) {
+// #if DIODE_DIRECTION == COL2ROW
+// for (int8_t r = MATRIX_ROWS - 1; r >= 0; --r) {
+// /* DDRxn */
+// _SFR_IO8((row_pins[r] >> 4) + 1) |= _BV(row_pins[r] & 0xF);
+// toggle_row(r);
+// }
+// for (int8_t c = MATRIX_COLS - 1; c >= 0; --c) {
+// /* PORTxn */
+// _SFR_IO8((col_pins[c] >> 4) + 2) |= _BV(col_pins[c] & 0xF);
+// }
+// #else
+// for (int8_t c = MATRIX_COLS - 1; c >= 0; --c) {
+// /* DDRxn */
+// _SFR_IO8((col_pins[c] >> 4) + 1) |= _BV(col_pins[c] & 0xF);
+// toggle_col(c);
+// }
+// for (int8_t r = MATRIX_ROWS - 1; r >= 0; --r) {
+// /* PORTxn */
+// _SFR_IO8((row_pins[r] >> 4) + 2) |= _BV(row_pins[r] & 0xF);
+// }
+// #endif
+// }
+
+void matrix_init(void) {
+ // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
+ #ifdef __AVR_ATmega32U4__
+ MCUCR |= _BV(JTD);
+ MCUCR |= _BV(JTD);
+ #endif
+
+ // 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;
+ }
+
+ matrix_init_quantum();
+}
+
+uint8_t matrix_scan(void)
+{
+
+#if DIODE_DIRECTION == COL2ROW
+ 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 = DEBOUNCING_DELAY;
+ }
+ unselect_rows();
+ }
+
+ if (debouncing) {
+ if (--debouncing) {
+ wait_us(1);
+ } else {
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ matrix[i] = matrix_debouncing[i];
+ }
+ }
+ }
+#else
+ for (uint8_t i = 0; i < MATRIX_COLS; i++) {
+ select_row(i);
+ wait_us(30); // without this wait read unstable value.
+ matrix_row_t rows = read_cols();
+ if (matrix_reversed_debouncing[i] != rows) {
+ matrix_reversed_debouncing[i] = rows;
+ if (debouncing) {
+ debug("bounce!: "); debug_hex(debouncing); debug("\n");
+ }
+ debouncing = DEBOUNCING_DELAY;
+ }
+ unselect_rows();
+ }
+
+ if (debouncing) {
+ if (--debouncing) {
+ wait_us(1);
+ } else {
+ for (uint8_t i = 0; i < MATRIX_COLS; i++) {
+ matrix_reversed[i] = matrix_reversed_debouncing[i];
+ }
+ }
+ }
+ for (uint8_t y = 0; y < MATRIX_ROWS; y++) {
+ matrix_row_t row = 0;
+ for (uint8_t x = 0; x < MATRIX_COLS; x++) {
+ row |= ((matrix_reversed[x] & (1<<y)) >> y) << x;
+ }
+ matrix[y] = row;
+ }
+#endif
+
+ matrix_scan_quantum();
+
+ return 1;
+}
+
+bool matrix_is_modified(void)
+{
+ if (debouncing) return false;
+ return true;
+}
+
+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");
+ }
+}
+
+uint8_t matrix_key_count(void)
+{
+ uint8_t count = 0;
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ count += bitpop16(matrix[i]);
+ }
+ return count;
+}
+
+static void init_cols(void)
+{
+#if DIODE_DIRECTION == COL2ROW
+ for(int x = 0; x < MATRIX_COLS; x++) {
+ int pin = col_pins[x];
+#else
+ for(int x = 0; x < MATRIX_ROWS; x++) {
+ int pin = row_pins[x];
+#endif
+ _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF);
+ _SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF);
+ }
+}
+
+static matrix_row_t read_cols(void)
+{
+ matrix_row_t result = 0;
+
+#if DIODE_DIRECTION == COL2ROW
+ for(int x = 0; x < MATRIX_COLS; x++) {
+ int pin = col_pins[x];
+#else
+ for(int x = 0; x < MATRIX_ROWS; x++) {
+ int pin = row_pins[x];
+#endif
+ result |= (_SFR_IO8(pin >> 4) & _BV(pin & 0xF)) ? 0 : (SHIFTER << x);
+ }
+ return result;
+}
+
+static void unselect_rows(void)
+{
+#if DIODE_DIRECTION == COL2ROW
+ for(int x = 0; x < MATRIX_ROWS; x++) {
+ int pin = row_pins[x];
+#else
+ for(int x = 0; x < MATRIX_COLS; x++) {
+ int pin = col_pins[x];
+#endif
+ _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF);
+ _SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF);
+ }
+}
+
+static void select_row(uint8_t row)
+{
+
+#if DIODE_DIRECTION == COL2ROW
+ int pin = row_pins[row];
+#else
+ int pin = col_pins[row];
+#endif
+ _SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF);
+ _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF);
+}
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