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+/*
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+Copyright 2012 Jun Wako <wakojun@gmail.com>
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+
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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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+
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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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+
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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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+
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+/*
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+ * scan matrix
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+ */
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+#include <stdint.h>
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+#include <stdbool.h>
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+#include <avr/io.h>
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+#include "wait.h"
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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 "split_util.h"
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+#include "pro_micro.h"
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+#include "config.h"
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+#include "timer.h"
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+#ifdef DEBUG_MATRIX_SCAN_RATE
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+ #include "matrix_scanrate.h"
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+#endif
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+
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+
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+
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+#ifdef USE_I2C
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+# include "i2c.h"
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+#else // USE_SERIAL
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+# error "only i2c supported"
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+#endif
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+
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+#ifndef DEBOUNCING_DELAY
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+# define DEBOUNCING_DELAY 5
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+#endif
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+
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+
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+#if (MATRIX_COLS <= 8)
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+# define print_matrix_header() print("\nr/c 01234567\n")
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+# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
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+# define matrix_bitpop(i) bitpop(matrix[i])
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+# define ROW_SHIFTER ((uint8_t)1)
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+#else
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+# error "Currently only supports 8 COLS"
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+#endif
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+
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+#define ERROR_DISCONNECT_COUNT 5
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+
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+#define ROWS_PER_HAND (MATRIX_ROWS/2)
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+
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+static uint8_t error_count = 0;
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+
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+static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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+static const uint8_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
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+
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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* debouncing_matrix_hand_offsetted; //pointer to matrix_debouncing for our hand
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+static matrix_row_t* matrix_hand_offsetted; // pointer to matrix for our hand
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+
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+//Debouncing counters
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+typedef uint8_t debounce_counter_t;
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+#define DEBOUNCE_COUNTER_MODULO 250
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+#define DEBOUNCE_COUNTER_INACTIVE 251
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+static debounce_counter_t debounce_counters[MATRIX_ROWS * MATRIX_COLS];
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+static debounce_counter_t *debounce_counters_hand_offsetted;
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+
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+
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+#if (DIODE_DIRECTION == ROW2COL)
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+ error "Only Col2Row supported";
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+#endif
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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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+static void unselect_row(uint8_t row);
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+static matrix_row_t optimized_col_reader(void);
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+
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+__attribute__ ((weak))
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+void matrix_init_kb(void) {
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+ matrix_init_user();
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+}
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+
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+__attribute__ ((weak))
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+void matrix_scan_kb(void) {
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+ matrix_scan_user();
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+}
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+
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+__attribute__ ((weak))
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+void matrix_init_user(void) {
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+}
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+
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+__attribute__ ((weak))
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+void matrix_scan_user(void) {
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+}
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+
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+__attribute__ ((weak))
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+void matrix_slave_scan_user(void) {
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+}
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+
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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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+
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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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+
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+void matrix_init(void)
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+{
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+#ifdef DISABLE_JTAG
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+ // JTAG disable for PORT F. write JTD bit twice within four cycles.
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+ MCUCR |= (1<<JTD);
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+ MCUCR |= (1<<JTD);
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+#endif
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+
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+ debug_enable = true;
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+ debug_matrix = false;
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+ debug_mouse = false;
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+ // initialize row and col
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+ unselect_rows();
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+ init_cols();
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+
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+ TX_RX_LED_INIT;
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+
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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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+ int my_hand_offset = isLeftHand ? 0 : (ROWS_PER_HAND);
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+ debouncing_matrix_hand_offsetted = matrix_debouncing + my_hand_offset;
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+ matrix_hand_offsetted = matrix + my_hand_offset;
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+ debounce_counters_hand_offsetted = debounce_counters + my_hand_offset;
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+
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+ for (uint8_t i = 0; i < MATRIX_ROWS * MATRIX_COLS; i++) {
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+ debounce_counters[i] = DEBOUNCE_COUNTER_INACTIVE;
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+ }
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+
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+ matrix_init_quantum();
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+
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+}
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+
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+//#define TIMER_DIFF(a, b, max) ((a) >= (b) ? (a) - (b) : (max) - (b) + (a))
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+void update_debounce_counters(uint8_t current_time)
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+{
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+ debounce_counter_t *debounce_pointer = debounce_counters_hand_offsetted;
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+ for (uint8_t row = 0; row < ROWS_PER_HAND; row++)
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+ {
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+ for (uint8_t col = 0; col < MATRIX_COLS; col++)
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+ {
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+ if (*debounce_pointer != DEBOUNCE_COUNTER_INACTIVE)
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+ {
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+ if (TIMER_DIFF(current_time, *debounce_pointer, DEBOUNCE_COUNTER_MODULO) >=
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+ DEBOUNCING_DELAY) {
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+ *debounce_pointer = DEBOUNCE_COUNTER_INACTIVE;
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+ }
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+ }
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+ debounce_pointer++;
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+ }
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+ }
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+}
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+
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+void transfer_matrix_values(uint8_t current_time)
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+{
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+ //upload from debounce_matrix to final matrix;
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+ debounce_counter_t *debounce_pointer = debounce_counters_hand_offsetted;
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+ for (uint8_t row = 0; row < ROWS_PER_HAND; row++)
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+ {
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+ matrix_row_t row_value = matrix_hand_offsetted[row];
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+ matrix_row_t debounce_value = debouncing_matrix_hand_offsetted[row];
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+
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+ for (uint8_t col = 0; col < MATRIX_COLS; col++)
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+ {
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+ bool final_value = debounce_value & (1 << col);
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+ bool current_value = row_value & (1 << col);
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+ if (*debounce_pointer == DEBOUNCE_COUNTER_INACTIVE
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+ && (current_value != final_value))
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+ {
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+ *debounce_pointer = current_time;
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+ row_value ^= (1 << col);
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+ }
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+ debounce_pointer++;
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+ }
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+ matrix_hand_offsetted[row] = row_value;
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+ }
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+}
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+
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+uint8_t _matrix_scan(void)
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+{
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+ uint8_t current_time = timer_read() % DEBOUNCE_COUNTER_MODULO;
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+
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+ // Set row, read cols
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+ for (uint8_t current_row = 0; current_row < ROWS_PER_HAND; current_row++) {
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+ select_row(current_row);
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+ asm volatile ("nop"); asm volatile("nop");
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+
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+ debouncing_matrix_hand_offsetted[current_row] = optimized_col_reader();
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+ // Unselect row
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+ unselect_row(current_row);
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+ }
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+
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+ update_debounce_counters(current_time);
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+ transfer_matrix_values(current_time);
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+
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+ return 1;
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+}
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+
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+
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+// Get rows from other half over i2c
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+int i2c_transaction(void) {
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+ int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
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+
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+ int err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_WRITE);
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+ if (err) goto i2c_error;
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+
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+ // start of matrix stored at 0x00
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+ err = i2c_master_write(I2C_KEYMAP_START);
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+ if (err) goto i2c_error;
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+
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+ // Start read
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+ err = i2c_master_start(SLAVE_I2C_ADDRESS + I2C_READ);
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+ if (err) goto i2c_error;
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+
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+ if (!err) {
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+ int i;
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+ for (i = 0; i < ROWS_PER_HAND-1; ++i) {
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+ matrix[slaveOffset+i] = i2c_master_read(I2C_ACK);
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+ }
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+ matrix[slaveOffset+i] = i2c_master_read(I2C_NACK);
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+ i2c_master_stop();
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+ } else {
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+i2c_error: // the cable is disconnceted, or something else went wrong
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+ i2c_reset_state();
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+ return err;
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+ }
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+
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+ return 0;
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+}
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+
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+uint8_t matrix_scan(void)
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+{
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+#ifdef DEBUG_MATRIX_SCAN_RATE
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+ matrix_check_scan_rate();
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+ matrix_time_between_scans();
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+#endif
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+ uint8_t ret = _matrix_scan();
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+
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+ if( i2c_transaction() ) {
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+ // turn on the indicator led when halves are disconnected
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+ TXLED1;
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+
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+ error_count++;
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+
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+ if (error_count > ERROR_DISCONNECT_COUNT) {
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+ // reset other half if disconnected
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+ int slaveOffset = (isLeftHand) ? (ROWS_PER_HAND) : 0;
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+ for (int i = 0; i < ROWS_PER_HAND; ++i) {
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+ matrix[slaveOffset+i] = 0;
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+ }
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+ }
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+ } else {
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+ // turn off the indicator led on no error
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+ TXLED0;
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+ error_count = 0;
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+ }
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+ matrix_scan_quantum();
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+ return ret;
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+}
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+
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+void matrix_slave_scan(void) {
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+ _matrix_scan();
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+
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+ int offset = (isLeftHand) ? 0 : ROWS_PER_HAND;
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+
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+ for (int i = 0; i < ROWS_PER_HAND; ++i) {
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+ i2c_slave_buffer[I2C_KEYMAP_START+i] = matrix[offset+i];
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+ }
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+
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+ matrix_slave_scan_user();
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+}
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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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+
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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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+
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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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+
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+uint8_t matrix_key_count(void)
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+{
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+ uint8_t count = 0;
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+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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+ count += bitpop16(matrix[i]);
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+ }
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+ return count;
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+}
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+
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+static void init_cols(void)
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+{
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+ for(uint8_t x = 0; x < MATRIX_COLS; x++) {
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+ uint8_t pin = col_pins[x];
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+ _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
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+ _SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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+ }
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+}
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+
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+inline
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+static matrix_row_t optimized_col_reader(void) {
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+ //MATRIX_COL_PINS { B6, B2, B3, B1, F7, F6, F5, F4 }
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+ return (PINB & (1 << 6) ? 0 : (ROW_SHIFTER << 0)) |
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+ (PINB & (1 << 2) ? 0 : (ROW_SHIFTER << 1)) |
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+ (PINB & (1 << 3) ? 0 : (ROW_SHIFTER << 2)) |
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+ (PINB & (1 << 1) ? 0 : (ROW_SHIFTER << 3)) |
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+ (PINF & (1 << 7) ? 0 : (ROW_SHIFTER << 4)) |
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+ (PINF & (1 << 6) ? 0 : (ROW_SHIFTER << 5)) |
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+ (PINF & (1 << 5) ? 0 : (ROW_SHIFTER << 6)) |
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+ (PINF & (1 << 4) ? 0 : (ROW_SHIFTER << 7));
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+}
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+
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+
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+static void select_row(uint8_t row)
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+{
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+ uint8_t pin = row_pins[row];
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+ _SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
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+ _SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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+}
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+
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+static void unselect_row(uint8_t row)
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+{
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+ uint8_t pin = row_pins[row];
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+ _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
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+ _SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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+}
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+
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+static void unselect_rows(void)
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+{
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+ for(uint8_t x = 0; x < ROWS_PER_HAND; x++) {
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+ uint8_t pin = row_pins[x];
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+ _SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
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+ _SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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+ }
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+}
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+
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Alex Ong