mirror of
https://github.com/Keychron/qmk_firmware.git
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38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/* Copyright 2021 Jane Bernhardt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "quantum.h"
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#include "i2c_master.h"
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extern i2c_status_t mcp23018_status;
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#define I2C_TIMEOUT 1000
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#define XXX KC_NO
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// I2C aliases and register addresses (see "mcp23018.md")
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#define I2C_ADDR 0x20 // 0b0100000
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#define I2C_ADDR_WRITE ((I2C_ADDR << 1) | I2C_WRITE)
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#define I2C_ADDR_READ ((I2C_ADDR << 1) | I2C_READ)
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#define IODIRA 0x00 // i/o direction register
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#define IODIRB 0x01
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#define GPPUA 0x0C // GPIO pull-up resistor register
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#define GPIOA 0x12 // general purpose i/o port register (write modifies OLAT)
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#define OLATA 0x14 // output latch register
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uint8_t init_mcp23018(void);
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