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// Copyright 2020 zvecr<git@zvecr.com>
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <stdint.h>
#include <stdbool.h>
/*
PCA9555
,----------.
SDA --| SDA P00 |-- P00
SCL --| SCL P01 |-- P01
INT --| INT P02 |-- P02
| P03 |-- P03
A0 --| A0 P04 |-- P04
A1 --| A1 P05 |-- P05
A2 --| A2 P06 |-- P06
| P07 |-- P07
| |
| P10 |-- P10
| P11 |-- P11
| P12 |-- P12
| P13 |-- P13
| P14 |-- P14
| P15 |-- P15
| P16 |-- P16
| P17 |-- P17
`----------'
*/
/**
* Port ID
*/
typedef enum {
PCA9555_PORT0,
PCA9555_PORT1,
} pca9555_port_t;
/**
* Helpers for set_config
*/
enum {
ALL_OUTPUT = 0,
ALL_INPUT = 0xFF,
};
/**
* Helpers for set_output
*/
enum {
ALL_LOW = 0,
ALL_HIGH = 0xFF,
};
/**
* Init expander and any other dependent drivers
*/
void pca9555_init(uint8_t slave_addr);
/**
* Configure input/output to a given port
*/
bool pca9555_set_config(uint8_t slave_addr, pca9555_port_t port, uint8_t conf);
/**
* Write high/low to a given port
*/
bool pca9555_set_output(uint8_t slave_addr, pca9555_port_t port, uint8_t conf);
/**
* Write high/low to both ports sequentially
*
* - slightly faster than multiple set_output
*/
bool pca9555_set_output_all(uint8_t slave_addr, uint8_t confA, uint8_t confB);
/**
* Read state of a given port
*/
bool pca9555_readPins(uint8_t slave_addr, pca9555_port_t port, uint8_t* ret);
/**
* Read state of both ports sequentially
*
* - slightly faster than multiple readPins
*/
bool pca9555_readPins_all(uint8_t slave_addr, uint16_t* ret);
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