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/* 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);
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