pcf857x.h

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/*
 * This file is part of the Ultibo project, https://ultibo.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2026 Garry Wood <garry@softoz.com.au>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#ifndef _ULTIBO_PCF857X_H
#define _ULTIBO_PCF857X_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "ultibo/gpio.h"
#include "ultibo/i2c.h"

#define PCF8574_GPIO_DESCRIPTION    "NXP PCF8574 8-bit I/O Expander" 
 
#define PCF8574_GPIO_MIN_PIN    GPIO_PIN_0
#define PCF8574_GPIO_MAX_PIN    GPIO_PIN_7
#define PCF8574_GPIO_PIN_COUNT  8
 
#define PCF857X_GPIO_MAX_LEVEL  GPIO_LEVEL_HIGH
 
#define PCF857X_GPIO_MAX_PULL   GPIO_PULL_UP
 
#define PCF857X_GPIO_MIN_FUNCTION   GPIO_FUNCTION_IN
#define PCF857X_GPIO_MAX_FUNCTION   GPIO_FUNCTION_OUT

#define PCF857X_CHIP_PCF8574    0

#define PCF8574_I2C_RATE    100000 
 
#define PCF8574_I2C_SIZE    1 
 
#define PCF857X_I2C_MAX_SIZE    2 


typedef struct _PCF857XGPIO PCF857XGPIO;
struct _PCF857XGPIO
{
    // GPIO Properties
    GPIO_DEVICE gpio;
    // PCF857X Properties
    I2C_DEVICE *i2c; 
    uint16_t address; 
    uint32_t chip; 
    uint32_t size; 
    uint32_t rate; 
    uint8_t gpiovalues[PCF857X_I2C_MAX_SIZE]; 
    uint8_t gppuvalues[PCF857X_I2C_MAX_SIZE]; 
    uint8_t iodirvalues[PCF857X_I2C_MAX_SIZE]; 
};


GPIO_DEVICE * STDCALL pcf8574gpio_create(I2C_DEVICE *i2c, uint16_t address);

uint32_t STDCALL pcf857xgpio_destroy(GPIO_DEVICE *gpio);

 
#ifdef __cplusplus
}
#endif
 
#endif // _ULTIBO_PCF857X_H