66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
// Copyright 2022 zvecr<git@zvecr.com>
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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/**
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* Port ID
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*/
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typedef enum {
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mcp23018_PORTA,
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mcp23018_PORTB,
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} mcp23018_port_t;
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/**
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* Helpers for set_config
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*/
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enum {
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ALL_OUTPUT = 0,
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ALL_INPUT = 0xFF,
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};
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/**
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* Helpers for set_output
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*/
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enum {
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ALL_LOW = 0,
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ALL_HIGH = 0xFF,
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};
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/**
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* Init expander and any other dependent drivers
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*/
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bool mcp23018_init(uint8_t slave_addr);
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/**
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* Configure input/output to a given port
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*/
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bool mcp23018_set_config(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf);
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/**
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* Write high/low to a given port
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*/
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bool mcp23018_set_output(uint8_t slave_addr, mcp23018_port_t port, uint8_t conf);
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/**
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* Write high/low to both ports sequentially
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*
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* - slightly faster than multiple set_output
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*/
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bool mcp23018_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB);
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/**
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* Read state of a given port
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*/
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bool mcp23018_readPins(uint8_t slave_addr, mcp23018_port_t port, uint8_t* ret);
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/**
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* Read state of both ports sequentially
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*
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* - slightly faster than multiple readPins
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*/
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bool mcp23018_readPins_all(uint8_t slave_addr, uint16_t* ret);
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