pcf8574.c File Reference

PCF8574 i2c port expander driver. More...

#include "pcf8574.h"
#include <cfg/module.h>
#include <drv/i2c.h>

Go to the source code of this file.

Functions
int	pcf8574_get (Pcf8574 *pcf)
	Read PCF8574 pcf bit status.
bool	pcf8574_put (Pcf8574 *pcf, uint8_t data)
	Write to PCF8574 pcf port data.
bool	pcf8574_init (Pcf8574 *pcf, pcf8574_addr addr)
	Init a PCF8574 on the bus with addr addr.

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Detailed Description

PCF8574 i2c port expander driver.

This driver controls the PCF8574. The PCF8574 is an 8bit i2c port expander. You can read/write 8 pins through an i2c bus. The pins are quasi-bidirectionals, this mean that without the need of a direction register you can use each pin as input or output, see datasheet on how this is achieved.

Version:

Id

pcf8574.c 2506 2009-04-15 08:29:07Z duplo

Author:

Francesco Sacchi <batt@develer.com>

Definition in file pcf8574.c.

---

Function Documentation

int pcf8574_get

(

Pcf8574 *

pcf

)

Read PCF8574 pcf bit status.

Returns:

the pins status or EOF on errors.

Definition at line 55 of file pcf8574.c.

bool pcf8574_init	(	Pcf8574 *	pcf,
		pcf8574_addr	addr
	)

Init a PCF8574 on the bus with addr addr.

Returns:

true if device is found, false otherwise.

Definition at line 80 of file pcf8574.c.

bool pcf8574_put	(	Pcf8574 *	pcf,
		uint8_t	data
	)

Write to PCF8574 pcf port data.

Returns:

true if ok, false on errors.

Definition at line 69 of file pcf8574.c.