#include "ultibo/gpio.h"
#include "ultibo/i2c.h"

Data Structures
struct	_PCF857XGPIO

Macros
#define	PCF8574_GPIO_DESCRIPTION "NXP PCF8574 8-bit I/O Expander"
	Description of PCF8574 device.
#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
	Default I2C clock rate (Device supports 100KHz only).
#define	PCF8574_I2C_SIZE 1
	Number of bytes to read/write all pin values.
#define	PCF857X_I2C_MAX_SIZE 2
	Maximum number of bytes to read/write all pin values.

Typedefs
typedef struct _PCF857XGPIO	PCF857XGPIO

Functions
GPIO_DEVICE *STDCALL	pcf8574gpio_create (I2C_DEVICE *i2c, uint16_t address)
	Create, register and start a new PCF8574 GPIO device connected to the specified I2C device.
uint32_t STDCALL	pcf857xgpio_destroy (GPIO_DEVICE *gpio)
	Stop, deregister and destroy a PCF857X GPIO device created by this driver.

Macro Definition Documentation

◆ PCF8574_GPIO_DESCRIPTION

#define PCF8574_GPIO_DESCRIPTION "NXP PCF8574 8-bit I/O Expander"

Description of PCF8574 device.

PCF857X specific constants

◆ PCF8574_GPIO_MIN_PIN

#define PCF8574_GPIO_MIN_PIN GPIO_PIN_0

◆ PCF8574_GPIO_MAX_PIN

#define PCF8574_GPIO_MAX_PIN GPIO_PIN_7

◆ PCF8574_GPIO_PIN_COUNT

#define PCF8574_GPIO_PIN_COUNT 8

◆ PCF857X_GPIO_MAX_LEVEL

#define PCF857X_GPIO_MAX_LEVEL GPIO_LEVEL_HIGH

◆ PCF857X_GPIO_MAX_PULL

#define PCF857X_GPIO_MAX_PULL GPIO_PULL_UP

◆ PCF857X_GPIO_MIN_FUNCTION

#define PCF857X_GPIO_MIN_FUNCTION GPIO_FUNCTION_IN

◆ PCF857X_GPIO_MAX_FUNCTION

#define PCF857X_GPIO_MAX_FUNCTION GPIO_FUNCTION_OUT

◆ PCF857X_CHIP_PCF8574

#define PCF857X_CHIP_PCF8574 0

PCF857X chip constants

◆ PCF8574_I2C_RATE

#define PCF8574_I2C_RATE 100000

Default I2C clock rate (Device supports 100KHz only).

PCF857X I2C constants

◆ PCF8574_I2C_SIZE

#define PCF8574_I2C_SIZE 1

Number of bytes to read/write all pin values.

◆ PCF857X_I2C_MAX_SIZE

#define PCF857X_I2C_MAX_SIZE 2

Maximum number of bytes to read/write all pin values.

Typedef Documentation

◆ PCF857XGPIO

typedef struct _PCF857XGPIO PCF857XGPIO

Note: The PCF857X is a single register device and does not have any direction, pull or configuration registers PCF857X specific types

Function Documentation

◆ pcf8574gpio_create()

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

Create, register and start a new PCF8574 GPIO device connected to the specified I2C device.

PCF857X Functions

Parameters

I2C	The I2C device this PCF8574 is connected to
Address	The I2C address for this PCF8574

Returns: Pointer to the new GPIO device or nil on failure

◆ pcf857xgpio_destroy()

uint32_t STDCALL pcf857xgpio_destroy ( GPIO_DEVICE * gpio )

Stop, deregister and destroy a PCF857X GPIO device created by this driver.