tca9539.h File Reference

#include "basetype.h"

Go to the source code of this file.

Functions
void	tca9539init ()
	< version of this include file More...
uint32_t	tca9539readPin (uint8_t *pUniqueID, uint8_t pinNumber)
int32_t	tca9539getDesiredOutputs (uint8_t address)
bool	tca9539setDesiredOutputs (uint8_t address, uint16_t value)
int32_t	tca9539getConfiguration (uint8_t address)
bool	tca9539setConfiguration (uint8_t address, uint16_t value)
bool	tca9539dumpState (Print *pPrinter, uint8_t address)
void	tca9539emitConfiguror (Print *pPrint, uint8_t pinIndex, bool setIOconfig, bool ioIsOutput, bool ioIsOn)
void	tca9539checkPinChanges ()

Detailed Description

Support for the TCA9539 I/O expander chip. This chip is an I2C device.

Function Documentation

void tca9539checkPinChanges

(

)

Check pin changes. Call this when changes in sensors have been detected. This may be called when no changes in pin state have occured.

NOTE: knowlege that address 0x77 pins 16 and 17 are pulse counting pins is buried inside this module.

bool tca9539dumpState	(	Print *	pPrinter,
		uint8_t	address
	)

print the current state of a device

Parameters

pPrinter	where to send the output
address	I2C address of the device to print

Returns

true if the device is found false otherwise

void tca9539emitConfiguror	(	Print *	pPrint,
		uint8_t	pinIndex,
		bool	setIOconfig,
		bool	ioIsOutput,
		bool	ioIsOn
	)

Emit the display and configuration for a TCA pin.

Parameters

pPrint	where to print the selector
pinIndex	current selected data type as an integer
setIOconfig	true to set the IO configuration or pin state
ioIsOutput	true if pin is an output
ioIsOn	true if intended value is on

int32_t tca9539getConfiguration

(

uint8_t

address

)

Get the current device pin configuration. The data is read from a data structure and reported. A one in any bit position indicates that the bit is configured as an input.

Parameters

address

I2C address of the device to read

Returns

-1 if the device is not found otherwise the pin configuration for the device

int32_t tca9539getDesiredOutputs

(

uint8_t

address

)

Get the current device desired output state. The data is read from a data structure and reported.

Parameters

address

I2C address of the device to read

Returns

-1 if the device is not found otherwise the desired output state

void tca9539init

(

)

< version of this include file

Initialize I/O expander devices. Find the devices and put them into the list of devices.

uint32_t tca9539readPin	(	uint8_t *	pUniqueID,
		uint8_t	pinNumber
	)

Read a pin of the tca9539 part.

The uniqueID is an 8 byte array. The first bytes are the MAC address of this processor. The last byte is the I2C address for the specific part to read.

Pin number 0 is the lowest order bit. Pin number 15 is the highest order bit.

Parameters

pUniqueID	ID of the part to read
pinNumber	pin number to read

bool tca9539setConfiguration	(	uint8_t	address,
		uint16_t	value
	)

Set the configuration of all pins. The configuration is logged in a data structure and is also sent to the device. A one in any bit position indicated that the pin is an input.

Parameters

address	I2C address of the device to update
value	New value for the pin configuration

Returns

true if the device is found and updated false otherwise

bool tca9539setDesiredOutputs	(	uint8_t	address,
		uint16_t	value
	)

Set the desired state of all output pins. The state is logged in a data structure and is also sent to the device.

Parameters

address	I2C address of the device to update
value	new value for the desired outputs state

Returns

true if the device is found and updated false otherwise