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-rw-r--r--keyboards/spiderisland/split78/matrix.c155
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diff --git a/keyboards/spiderisland/split78/matrix.c b/keyboards/spiderisland/split78/matrix.c
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+++ b/keyboards/spiderisland/split78/matrix.c
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+/*
+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 "split78.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);
+}