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diff --git a/keyboards/gboards/gergo/matrix.c b/keyboards/gboards/gergo/matrix.c
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+/*
+
+Copyright 2013 Oleg Kostyuk <cub.uanic@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 "matrix.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include "wait.h"
+#include "action_layer.h"
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "debounce.h"
+#include QMK_KEYBOARD_H
+
+#ifdef BALLER
+#include <avr/interrupt.h>
+#include "pointing_device.h"
+#endif
+
+#ifndef DEBOUNCE
+# define DEBOUNCE 5
+#endif
+
+// MCP Pin Defs
+#define RROW1 (1u<<3)
+#define RROW2 (1u<<2)
+#define RROW3 (1u<<1)
+#define RROW4 (1u<<0)
+#define COL0 (1u<<0)
+#define COL1 (1u<<1)
+#define COL2 (1u<<2)
+#define COL3 (1u<<3)
+#define COL4 (1u<<4)
+#define COL5 (1u<<5)
+#define COL6 (1u<<6)
+
+// ATmega pin defs
+#define ROW1 (1u<<6)
+#define ROW2 (1u<<5)
+#define ROW3 (1u<<4)
+#define ROW4 (1u<<1)
+#define COL7 (1u<<0)
+#define COL8 (1u<<1)
+#define COL9 (1u<<2)
+#define COL10 (1u<<3)
+#define COL11 (1u<<2)
+#define COL12 (1u<<3)
+#define COL13 (1u<<6)
+
+//Trackball pin defs
+#define TRKUP (1u<<4)
+#define TRKDN (1u<<5)
+#define TRKLT (1u<<6)
+#define TRKRT (1u<<7)
+#define TRKBTN (1u<<6)
+
+
+// Multiple for mouse moves
+#ifndef TRKSTEP
+#define TRKSTEP 20
+#endif
+
+// multiple for mouse scroll
+#ifndef SCROLLSTEP
+#define SCROLLSTEP 5
+#endif
+
+// bit masks
+#define BMASK (COL7 | COL8 | COL9 | COL10)
+#define CMASK (COL13)
+#define DMASK (COL11 | COL12)
+#define FMASK (ROW1 | ROW2 | ROW3 | ROW4)
+#define RROWMASK (RROW1 | RROW2 | RROW3 | RROW4)
+#define MCPMASK (COL0 | COL1 | COL2 | COL3 | COL4 | COL5 | COL6)
+#define TRKMASK (TRKUP | TRKDN | TRKRT | TRKLT)
+
+// Trackball interrupts accumulate over here. Processed on scan
+// Stores prev state of mouse, high bits store direction
+uint8_t trkState = 0;
+uint8_t trkBtnState = 0;
+
+volatile uint8_t tbUpCnt = 0;
+volatile uint8_t tbDnCnt = 0;
+volatile uint8_t tbLtCnt = 0;
+volatile uint8_t tbRtCnt = 0;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+/*
+ * matrix state(1:on, 0:off)
+ * contains the raw values without debounce filtering of the last read cycle.
+ */
+static matrix_row_t raw_matrix[MATRIX_ROWS];
+
+// Debouncing: store for each key the number of scans until it's eligible to
+// change. When scanning the matrix, ignore any changes in keys that have
+// already changed in the last DEBOUNCE scans.
+
+static matrix_row_t read_cols(uint8_t row);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+static void enableInterrupts(void);
+
+static uint8_t mcp23018_reset_loop;
+// static uint16_t mcp23018_reset_loop;
+
+__attribute__ ((weak)) void matrix_init_user(void) {}
+
+__attribute__ ((weak)) void matrix_scan_user(void) {}
+
+__attribute__ ((weak))
+void matrix_init_kb(void) {
+ matrix_init_user();
+}
+
+__attribute__ ((weak))
+void matrix_scan_kb(void) {
+ matrix_scan_user();
+}
+
+inline uint8_t matrix_rows(void) { return MATRIX_ROWS; }
+
+inline uint8_t matrix_cols(void) { return MATRIX_COLS; }
+
+
+void matrix_init(void) {
+ // initialize row and col
+ mcp23018_status = init_mcp23018();
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ raw_matrix[i] = 0;
+ }
+
+ debounce_init(MATRIX_ROWS);
+ matrix_init_quantum();
+}
+
+void matrix_power_up(void) {
+ mcp23018_status = init_mcp23018();
+
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ }
+}
+
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_raw_matrix_row(uint8_t index) {
+ matrix_row_t temp = read_cols(index);
+ if (raw_matrix[index] != temp) {
+ raw_matrix[index] = temp;
+ return true;
+ }
+ return false;
+}
+
+
+
+uint8_t matrix_scan(void) {
+ // TODO: Find what is trashing interrupts
+ enableInterrupts();
+
+ // First we handle the mouse inputs
+#ifdef BALLER
+ uint8_t pBtn = PINE & TRKBTN;
+
+ #ifdef DEBUG_BALLER
+ // Compare to previous, mod report
+ if (tbUpCnt + tbDnCnt + tbLtCnt + tbRtCnt != 0)
+ xprintf("U: %d D: %d L: %d R: %d B: %d\n", tbUpCnt, tbDnCnt, tbLtCnt, tbRtCnt, (trkBtnState >> 6));
+ #endif
+
+ // Modify the report
+ report_mouse_t pRprt = pointing_device_get_report();
+
+ // Scroll by default, move on layer
+ if (layer_state == 0) {
+ pRprt.h += tbLtCnt * SCROLLSTEP; tbLtCnt = 0;
+ pRprt.h -= tbRtCnt * SCROLLSTEP; tbRtCnt = 0;
+ pRprt.v -= tbUpCnt * SCROLLSTEP; tbUpCnt = 0;
+ pRprt.v += tbDnCnt * SCROLLSTEP; tbDnCnt = 0;
+ } else {
+ pRprt.x -= tbLtCnt * TRKSTEP * (layer_state - 1); tbLtCnt = 0;
+ pRprt.x += tbRtCnt * TRKSTEP * (layer_state - 1); tbRtCnt = 0;
+ pRprt.y -= tbUpCnt * TRKSTEP * (layer_state - 1); tbUpCnt = 0;
+ pRprt.y += tbDnCnt * TRKSTEP * (layer_state - 1); tbDnCnt = 0;
+ }
+
+#ifdef DEBUG_BALLER
+ if (pRprt.x != 0 || pRprt.y != 0)
+ xprintf("X: %d Y: %d\n", pRprt.x, pRprt.y);
+#endif
+
+ if ((pBtn != trkBtnState) && ((pBtn >> 6) == 0)) pRprt.buttons |= MOUSE_BTN1;
+ if ((pBtn != trkBtnState) && ((pBtn >> 6) == 1)) pRprt.buttons &= ~MOUSE_BTN1;
+
+ // Save state, push update
+ if (pRprt.x != 0 || pRprt.y != 0 || pRprt.h != 0 || pRprt.v != 0 || (trkBtnState != pBtn))
+ pointing_device_set_report(pRprt);
+
+ trkBtnState = pBtn;
+#endif
+
+ // Then the keyboard
+ if (mcp23018_status) { // if there was an error
+ if (++mcp23018_reset_loop == 0) {
+ // if (++mcp23018_reset_loop >= 1300) {
+ // since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
+ // this will be approx bit more frequent than once per second
+ print("trying to reset mcp23018\n");
+ mcp23018_status = init_mcp23018();
+ if (mcp23018_status) {
+ print("left side not responding\n");
+ } else {
+ print("left side attached\n");
+ }
+ }
+ }
+
+ bool changed = false;
+ for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
+ // select rows from left and right hands
+ uint8_t left_index = i;
+ uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+ select_row(left_index);
+ select_row(right_index);
+
+ // we don't need a 30us delay anymore, because selecting a
+ // left-hand row requires more than 30us for i2c.
+
+ changed |= store_raw_matrix_row(left_index);
+ changed |= store_raw_matrix_row(right_index);
+
+ unselect_rows();
+ }
+
+ debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
+ matrix_scan_quantum();
+
+ enableInterrupts();
+
+#ifdef DEBUG_MATRIX
+ for (uint8_t c = 0; c < MATRIX_COLS; c++)
+ for (uint8_t r = 0; r < MATRIX_ROWS; r++)
+ if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
+#endif
+
+ 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++) {
+ print_hex8(row); print(": ");
+ print_bin_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;
+}
+
+// Remember this means ROWS
+static void init_cols(void) {
+ // init on mcp23018
+ // not needed, already done as part of init_mcp23018()
+
+ // Input with pull-up(DDR:0, PORT:1)
+ DDRF &= ~FMASK;
+ PORTF |= FMASK;
+}
+
+static matrix_row_t read_cols(uint8_t row) {
+ if (row < 7) {
+ if (mcp23018_status) { // if there was an error
+ return 0;
+ } else {
+ uint8_t data = 0;
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPIOB, I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_read_nack(I2C_TIMEOUT); if (mcp23018_status < 0) goto out;
+ data = ~((uint8_t)mcp23018_status);
+ mcp23018_status = I2C_STATUS_SUCCESS;
+ out:
+ i2c_stop();
+
+#ifdef DEBUG_MATRIX
+ if (data != 0x00) xprintf("I2C: %d\n", data);
+#endif
+ return data;
+ }
+ } else {
+ /* read from teensy
+ * bitmask is 0b0111001, but we want the lower four
+ * we'll return 1s for the top two, but that's harmless.
+ */
+ // So I need to confuckulate all this
+ //return ~(((PIND & DMASK) >> 1 | ((PINC & CMASK) >> 6) | (PIN)));
+ //return ~((PINF & 0x03) | ((PINF & 0xF0) >> 2));
+ return ~(
+ (((PINF & ROW4) >> 1)
+ | ((PINF & (ROW1 | ROW2 | ROW3)) >> 3))
+ & 0xF);
+ }
+}
+
+// Row pin configuration
+static void unselect_rows(void)
+{
+ // no need to unselect on mcp23018, because the select step sets all
+ // the other row bits high, and it's not changing to a different
+ // direction
+ // Hi-Z(DDR:0, PORT:0) to unselect
+ DDRB &= ~(BMASK | TRKMASK);
+ PORTB &= ~(BMASK);
+ DDRC &= ~CMASK;
+ PORTC &= ~CMASK;
+ DDRD &= ~DMASK;
+ PORTD &= ~DMASK;
+
+ // Fix trashing of DDRB for TB
+ PORTB |= TRKMASK;
+}
+
+static void select_row(uint8_t row)
+{
+ if (row < 7) {
+ // select on mcp23018
+ if (mcp23018_status) { // do nothing on error
+ } else { // set active row low : 0 // set other rows hi-Z : 1
+ mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT); if (mcp23018_status) goto out;
+ mcp23018_status = i2c_write(0xFF & ~(1<<row), I2C_TIMEOUT); if (mcp23018_status) goto out;
+ out:
+ i2c_stop();
+ }
+ } else {
+ // Output low(DDR:1, PORT:0) to select
+ switch (row) {
+ case 7:
+ DDRB |= COL7;
+ PORTB &= ~COL7;
+ break;
+ case 8:
+ DDRB |= COL8;
+ PORTB &= ~COL8;
+ break;
+ case 9:
+ DDRB |= COL9;
+ PORTB &= ~COL9;
+ break;
+ case 10:
+ DDRB |= COL10;
+ PORTB &= ~COL10;
+ break;
+ case 11:
+ DDRD |= COL11;
+ PORTD &= ~COL11;
+ break;
+ case 12:
+ DDRD |= COL12;
+ PORTD &= ~COL12;
+ break;
+ case 13:
+ DDRC |= COL13;
+ PORTC &= ~COL13;
+ break;
+ }
+ }
+}
+
+
+// Trackball Interrupts
+static void enableInterrupts(void) {
+ #ifdef BALLER
+ // Set interrupt mask
+ // Set port defs
+ DDRB &= ~TRKMASK;
+ PORTB |= TRKMASK;
+ DDRE &= ~TRKBTN;
+ PORTE |= TRKBTN;
+
+ // Interrupt shenanigans
+ //EIMSK |= (1 << PCIE0);
+ PCMSK0 |= TRKMASK;
+ PCICR |= (1 << PCIE0);
+ sei();
+ #endif
+
+ return;
+}
+#ifdef BALLER
+ISR (PCINT0_vect) {
+ // Don't get fancy, we're in a interrupt here
+ // PCINT reports a interrupt for a change on the bus
+ // We hand the button at scantime for debounce
+ volatile uint8_t pState = PINB & TRKMASK;
+ if ((pState & TRKUP) != (trkState & TRKUP)) tbUpCnt++;
+ if ((pState & TRKDN) != (trkState & TRKDN)) tbDnCnt++;
+ if ((pState & TRKLT) != (trkState & TRKLT)) tbLtCnt++;
+ if ((pState & TRKRT) != (trkState & TRKRT)) tbRtCnt++;
+ trkState = pState;
+
+}
+#endif
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