[Keyboard] Wheatfield Split75 (#8511)

* Added split75 keyboard

* tidy up commented out code + removed default

* added visual map

* proper led functions. more layers for keymap

* led functions. moved mod keys to numbers

* double tapping toggle + leds on power on

* media keys fix

* clean up of commented out code and unnecessary functions. readme update.
default keymap

* removed bootloadHID file

* Update keyboards/split75/config.h

* Update keyboards/split75/config.h

* Update keyboards/split75/config.h

* Update keyboards/split75/config.h

* removed python flashing script

* Update keyboards/split75/keymaps/default/keymap.c

* Update keyboards/split75/split75.h

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/default/keymap.c

* reintroduced empty matrix_scan_user to default keymap

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/usbconfig.h

* Update keyboards/ergodone/config.h

* Update keyboards/split75/keymaps/art/keymap.c

* updated readme file

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/rules.mk

* Update keyboards/split75/split75.c

* code fix after suggestions

* defined tapping toggle as double tap

* added info.json

* Update keyboards/split75/config.h

* fix for leds not displaying properly when initialising

* Update keyboards/split75/README.md

* Update keyboards/split75/keymaps/default/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* changed product description fields

* renamed user functions

* indentation fix

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* art keymap update

* Update keyboards/split75/config.h

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/keymaps/art/keymap.c

* Update keyboards/split75/keymaps/default/keymap.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/matrix.c

* Update keyboards/split75/rules.mk

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/config.h

* Update keyboards/split75/split75.c

* disable underglow on sleep and enabled backlighting

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* Update keyboards/split75/usbconfig.h

* personal keymap update

* changed boot animation

* consistent whitespace

* Tidied up default notes and unnecessary comments

* Unique Vendor ID

* remove usb config file

* corrected manufacturer

* Update keyboards/split75/config.h

* Update keyboards/split75/README.md

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.c

* Update keyboards/split75/split75.h

* Update keyboards/split75/split75.h

* Update keyboards/split75/split75.h

* Update keyboards/split75/split75.c

* Update keyboards/split75/matrix.c

* Update keyboards/split75/matrix.c

* Update keyboards/split75/matrix.c

* Update keyboards/split75/matrix.c

* Update keyboards/split75/split75.h

* Personal keymap restore after refactor

* Moved to wheatfield folder + updated readme

1 files changed, 155 insertions, 0 deletions

diff --git a/keyboards/wheatfield/split75/matrix.c b/keyboards/wheatfield/split75/matrix.c
new file mode 100644
index 000000000..9e86bfc37
--- /dev/null
+++ b/keyboards/wheatfield/split75/matrix.c
@@ -0,0 +1,155 @@
+/*
+Copyright 2017 Luiz Ribeiro <luizribeiro@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 <string.h>
+#include <stdio.h>
+#include "quantum.h"
+#include "i2c_master.h"
+#include "split75.h"
+
+#define RIGHT_HALF
+
+
+void matrix_set_row_status(uint8_t row);
+
+
+#if defined(RIGHT_HALF)
+#define I2C_TIMEOUT     10
+#define MCP23018_TWI_ADDRESS 0b0100000
+#define TW_READ        1
+#define TW_WRITE    0
+#define TWI_ADDR_WRITE ( (MCP23018_TWI_ADDRESS<<1) | TW_WRITE )
+#define TWI_ADDR_READ  ( (MCP23018_TWI_ADDRESS<<1) | TW_READ  )
+#define IODIRA 0x00  // i/o direction register
+#define IODIRB 0x01
+#define IODIRA 0x00  // i/o direction register
+#define IODIRB 0x01
+#define GPPUA  0x0C  // GPIO pull-up resistor register
+#define GPPUB  0x0D
+#define GPIOA  0x12  // general purpose i/o port register (write modifies OLAT)
+#define GPIOB  0x13
+#define OLATA  0x14  // output latch register
+#define OLATB  0x15
+#define MCP_ROWS_START    8
+
+static uint8_t mcp23018_init(void) {
+    uint8_t ret;
+    uint8_t data[3];
+    // set pin direction
+    // - unused  : input  : 1
+    // - input   : input  : 1
+    // - driving : output : 0
+    data[0] = IODIRA;
+    data[1] = 0b00000000;  // IODIRA
+    data[2] = (0b11111111);  // IODIRB
+
+    ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT);
+    if (ret) goto out;  // make sure we got an ACK
+
+    // set pull-up
+    // - unused  : on  : 1
+    // - input   : on  : 1
+    // - driving : off : 0
+    data[0] = GPPUA;
+    data[1] = 0b00000000;  // IODIRA
+    data[2] = (0b11111111);  // IODIRB
+
+    ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT);
+    if (ret) goto out;  // make sure we got an ACK
+
+    // set logical value (doesn't matter on inputs)
+    // - unused  : hi-Z : 1
+    // - input   : hi-Z : 1
+    // - driving : hi-Z : 1
+    data[0] = OLATA;
+    data[1] = 0b11111111;  // IODIRA
+    data[2] = (0b11111111);  // IODIRB
+
+    ret = i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)data, 3, I2C_TIMEOUT);
+
+out:
+    return ret;
+}
+#endif
+
+void matrix_init_custom(void) {
+    // Set rows as output starting high
+    DDRB = 0xFF;
+    PORTB = 0xFF;
+
+    // Set columns as inputs with pull-up enabled
+    DDRA = 0x00;
+    PORTA = 0xFF;
+
+    // Initialize i2c communication
+    i2c_init();
+
+#if defined(RIGHT_HALF)
+    // Initialize the chip on the other half
+    mcp23018_init();
+#endif
+
+}
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool matrix_has_changed = false;
+
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        // Store last value of row prior to reading
+        matrix_row_t last_row_value = current_matrix[row];
+
+        matrix_row_t cols = 0;
+            // Select the row to scan
+        matrix_set_row_status(row);
+
+        matrix_io_delay();
+            //Set the local row
+
+#if defined(RIGHT_HALF)
+                // Initialize to 0x7F in case I2C read fails, 
+                // as 0x75 would be no keys pressed
+                uint8_t data = 0x7F;
+                // Receive the columns from right half
+                i2c_receive(TWI_ADDR_WRITE, &data, 1, I2C_TIMEOUT);
+#endif
+
+        cols |= ((~(PINA | 0x80)) & 0x7F);
+#if defined(RIGHT_HALF)
+                cols |= (((~(data | 0x80)) & 0x7F) << 7);
+#endif
+
+        current_matrix[row] = cols;
+        matrix_has_changed |= (last_row_value != current_matrix[row]);
+    }
+
+    return matrix_has_changed;
+}
+
+void matrix_set_row_status(uint8_t row) {
+#if defined(RIGHT_HALF)
+    uint8_t txdata[3];
+
+    //Set the remote row on port A
+    txdata[0] = (GPIOA);
+    txdata[1] = ( 0xFF & ~(1<<row) );
+    i2c_transmit(TWI_ADDR_WRITE, (uint8_t *)txdata, 2, I2C_TIMEOUT);
+#endif
+
+    //Set the local row on port B
+    DDRB = (1 << row);
+    PORTB = ~(1 << row);
+}