pcf8574.c File Reference

This module provides all the primitives to read and write data to/from a PCF8574 Remote 8-bit I/O Expander. More...

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Functions
int	pcf8574_Read (knet_dev_t *dev, unsigned char *value, unsigned char mask)
int	pcf8574_Write (knet_dev_t *dev, unsigned char value)

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Detailed Description

This module provides all the primitives to read and write data to/from a PCF8574 Remote 8-bit I/O Expander.

Philips PCF8574 Remote 8-bit I/O Expander Support

Author:

Cédric Gaudin (K-Team SA)

Note:

Copyright (C) 2004 K-TEAM SA

Bug:

none discovered.

Todo:

nothing.

Definition in file pcf8574.c.

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Function Documentation

int pcf8574_Read	(	knet_dev_t *	dev,
		unsigned char *	value,
		unsigned char	mask
	)

This function reads 8-bit from the Remote I/O Expander

Parameters:

	dev	K-Net Device Descriptor
	value	The value read.

Returns:

A value :

• <0 on error
• >=0 on success

Definition at line 38 of file pcf8574.c.

References knet_lltransfer().

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int pcf8574_Write	(	knet_dev_t *	dev,
		unsigned char	value
	)

This function writes 8-bit from the Remote I/O Expander

Parameters:

	dev	K-Net Device Descriptor
	value	The value to write.

Returns:

A value :

• <0 on error
• >=0 on success

Definition at line 66 of file pcf8574.c.

References knet_llwrite().

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