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