mh
/
qmk_firmware
mirror of https://github.com/qmk/qmk_firmware/


								/* Copyright 2021 Jane Bernhardt

								  *

								  * 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/>.

								  */


								#pragma once


								#include "quantum.h"

								#include "i2c_master.h"


								extern i2c_status_t mcp23018_status;

								#define I2C_TIMEOUT 1000


								#define XXX KC_NO


								// I2C aliases and register addresses (see "mcp23018.md")

								#define I2C_ADDR 0x20  // 0b0100000

								#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)

								#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)

								#define IODIRA 0x00  // i/o direction register

								#define IODIRB 0x01

								#define GPPUA 0x0C  // GPIO pull-up resistor register

								#define GPIOA 0x12  // general purpose i/o port register (write modifies OLAT)

								#define OLATA 0x14  // output latch register


								uint8_t init_mcp23018(void);