pca9554.h File Reference

PCA9554 module interface functions declarations. More...

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Macros
#define	PCA9554_INPUT_REG   0
	PCA9554 Input port status register (Read only)
#define	PCA9554_OUTPUT_REG   1
	PCA9554 Output port register (Read/write)
#define	PCA9554_POLARITY_REG   2
	PCA9554 Polarity Inversion register (Read/write)
#define	PCA9554_CFG_REG   3
	PCA9554 Configuration register (Read/write)

Functions
uint8_t	pca9554_read_port (uint8_t chip_id, uint8_t *readout)
	Read all pins status.
uint8_t	pca9554_read_pin (uint8_t chip_id, uint8_t pin, uint8_t *status)
	Read a pin status.
uint8_t	pca9554_write_port (uint8_t chip_id, uint8_t data)
	Write all output pins.
uint8_t	pca9554_write_pin (uint8_t chip_id, uint8_t pin, bool data)
	Write a output pin.
uint8_t	pca9554_set_port_pol (uint8_t chip_id, uint8_t pol)
	Set all pins polarity.
uint8_t	pca9554_set_pin_pol (uint8_t chip_id, uint8_t pin, bool pol)
	Set pin polarity.
uint8_t	pca9554_get_port_pol (uint8_t chip_id, uint8_t *pol)
	Read all pins polarity.
uint8_t	pca9554_get_pin_pol (uint8_t chip_id, uint8_t pin, uint8_t *pol)
	Read pin polarity.
uint8_t	pca9554_set_port_dir (uint8_t chip_id, uint8_t dir)
	Set all pins direction.
uint8_t	pca9554_set_pin_dir (uint8_t chip_id, uint8_t pin, bool dir)
	Set pin direction.
uint8_t	pca9554_get_port_dir (uint8_t chip_id, uint8_t *dir)
	Read all pins direction.
uint8_t	pca9554_get_pin_dir (uint8_t chip_id, uint8_t pin, uint8_t *dir)
	Read pin direction.

Detailed Description

PCA9554 module interface functions declarations.

Author

Henrique Silva henri.nosp@m.que..nosp@m.silva.nosp@m.@lnl.nosp@m.s.br

Function Documentation

pca9554_get_pin_dir()

uint8_t pca9554_get_pin_dir	(	uint8_t	chip_id,
		uint8_t	pin,
		uint8_t *	dir )

Read pin direction.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pin	Selected pin
[out]	dir	Pin direction

Returns

Number of bytes read from the device

pca9554_get_pin_pol()

uint8_t pca9554_get_pin_pol	(	uint8_t	chip_id,
		uint8_t	pin,
		uint8_t *	pol )

Read pin polarity.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pin	Selected pin
[out]	pol	Pin polarity value

Returns

Number of bytes read from the device

pca9554_get_port_dir()

uint8_t pca9554_get_port_dir	(	uint8_t	chip_id,
		uint8_t *	dir )

Read all pins direction.

Parameters

[in]	chip_id	Chip ID to communicate
[out]	dir	8-bit value with the pins direction setup

Returns

Number of bytes written to the device

pca9554_get_port_pol()

uint8_t pca9554_get_port_pol	(	uint8_t	chip_id,
		uint8_t *	pol )

Read all pins polarity.

Parameters

[in]	chip_id	Chip ID to communicate
[out]	pol	Pins polarity (active-high/low)

Returns

Number of bytes written to the device

pca9554_read_pin()

uint8_t pca9554_read_pin	(	uint8_t	chip_id,
		uint8_t	pin,
		uint8_t *	status )

Read a pin status.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pin	Selected pin to read
[out]	status	Pin logical status

Returns

Number of bytes read from the device

pca9554_read_port()

uint8_t pca9554_read_port	(	uint8_t	chip_id,
		uint8_t *	readout )

Read all pins status.

Parameters

[in]	chip_id	Chip ID to communicate
[out]	readout	8-bit value with the pins status

Returns

Number of bytes read from the device

pca9554_set_pin_dir()

uint8_t pca9554_set_pin_dir	(	uint8_t	chip_id,
		uint8_t	pin,
		bool	dir )

Set pin direction.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pin	Selected pin
[in]	dir	Pin direction ( 0-Output 1-Input )

Returns

Number of bytes written to the device

pca9554_set_pin_pol()

uint8_t pca9554_set_pin_pol	(	uint8_t	chip_id,
		uint8_t	pin,
		bool	pol )

Set pin polarity.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pin	Selected pin
[in]	pol	Pin Polarity (active-high/low)

Returns

Number of bytes written to the device

pca9554_set_port_dir()

uint8_t pca9554_set_port_dir	(	uint8_t	chip_id,
		uint8_t	dir )

Set all pins direction.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	dir	Pin direction ( 0-Output 1-Input )

Returns

Number of bytes read from the device

pca9554_set_port_pol()

uint8_t pca9554_set_port_pol	(	uint8_t	chip_id,
		uint8_t	pol )

Set all pins polarity.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pol	Polarity (active-high/low)

Returns

Number of bytes written to the device

pca9554_write_pin()

uint8_t pca9554_write_pin	(	uint8_t	chip_id,
		uint8_t	pin,
		bool	data )

Write a output pin.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	pin	Selected pin to write
[in]	data	Logical status to be set

Returns

Number of bytes written to the device

pca9554_write_port()

uint8_t pca9554_write_port	(	uint8_t	chip_id,
		uint8_t	data )

Write all output pins.

Parameters

[in]	chip_id	Chip ID to communicate
[in]	data	8-bit value with the pins status

Returns

Number of bytes written to the device