88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
// Copyright 2020 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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PCA9555
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,----------.
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SDA --| SDA P00 |-- P00
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SCL --| SCL P01 |-- P01
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INT --| INT P02 |-- P02
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| P03 |-- P03
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A0 --| A0 P04 |-- P04
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A1 --| A1 P05 |-- P05
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A2 --| A2 P06 |-- P06
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| P07 |-- P07
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| |
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| P10 |-- P10
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| P11 |-- P11
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| P12 |-- P12
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| P13 |-- P13
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| P14 |-- P14
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| P15 |-- P15
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| P16 |-- P16
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| P17 |-- P17
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`----------'
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*/
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/**
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* Port ID
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*/
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typedef enum {
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PCA9555_PORT0,
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PCA9555_PORT1,
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} pca9555_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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void pca9555_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 pca9555_set_config(uint8_t slave_addr, pca9555_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 pca9555_set_output(uint8_t slave_addr, pca9555_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 pca9555_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 pca9555_readPins(uint8_t slave_addr, pca9555_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 pca9555_readPins_all(uint8_t slave_addr, uint16_t* ret);
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