PCF8591 Class Reference

#include <PCF8591.hh>

Inheritance diagram for PCF8591:

Collaboration diagram for PCF8591:

Public Types
enum	{   AIN0 = 0x00, AIN1 = 0x01, AIN2 = 0x02, AIN3 = 0x03,   CHANNEL_MASK = 0x03, AUTO_INCREMENT = 0x04, FOUR_INPUTS = 0x00, THREE_DIFF_INPUTS = 0x10,   TWO_MIXED_INPUTS = 0x20, TWO_DIFF_INPUTS = 0x30, OUTPUT_ENABLE = 0x40 }

Public Member Functions
	PCF8591 (uint8_t addr=0)
bool	begin (uint8_t cntl)
void	end ()
uint8_t	sample ()
uint8_t	sample (uint8_t cntl)
int	sample (uint8_t *buf, uint8_t size)
bool	convert (uint8_t value)

Private Member Functions
bool	is_async () const
void	sync_request ()
void	async_request ()
virtual void	on_completion (uint8_t type, int count)

Private Attributes
uint8_t	m_addr
bool	m_async

Detailed Description

Driver for the PCF8591 2-Wire 8-bit A/D and D/A converter.

Circuit

PCF8591 module with potentiometer, photoresistor and thermistor.

                         PCF8591
                      +------------+
(POT)---[ ]---------1-|AIN0     VCC|-16--------------(VCC)
(PHR)---[ ]---------2-|AIN1    AOUT|-15-------------(AOUT)
(THM)---[ ]---------3-|AIN2    VREF|-14--------------(VCC)
(AIN3)--------------4-|AIN3    AGND|-13--------------(GND)
(GND)---------------5-|A0       EXT|-12--------------(GND)
(GND)---------------6-|A1       OSC|-11
(GND)---------------7-|A2       SCL|-10-----------(SCL/A5)
(GND)---------------8-|GND      SDA|-9------------(SDA/A4)
                      +------------+

References

1. Philips Semiconductor product description (Rev. 2003 Jan 27).

Definition at line 48 of file PCF8591.hh.

Member Enumeration Documentation

anonymous enum

Control byte; selection of input channel and mode of operation Fig. 5 Control byte, pp. 6.

Enumerator
AIN0
AIN1
AIN2
AIN3
CHANNEL_MASK
AUTO_INCREMENT
FOUR_INPUTS
THREE_DIFF_INPUTS
TWO_MIXED_INPUTS
TWO_DIFF_INPUTS
OUTPUT_ENABLE

Definition at line 54 of file PCF8591.hh.

Constructor & Destructor Documentation

PCF8591::PCF8591 ( uint8_t  addr = 0 )

inline

Construct PCF8591 TWI A/D, D/A converter device access to given chip address.

Parameters

[in]

addr

chip address (0..7)

Definition at line 73 of file PCF8591.hh.

Member Function Documentation

bool PCF8591::begin

(

uint8_t

cntl

)

Begin a sampling sequence for the channel given by the control parameter. Return true(1) if successful otherwise false(0).

Parameters

[in]

cntl

control byte

Returns

bool

Definition at line 24 of file PCF8591.cpp.

bool PCF8591::convert

(

uint8_t

value

)

Convert given value to analog output (voltage). Return true(1) if successful otherwise false(0).

Parameters

[in]

value

output value.

Returns

bool

Definition at line 34 of file PCF8591.cpp.

void PCF8591::end ( )

inline

End sampling sequence.

Definition at line 89 of file PCF8591.hh.

uint8_t PCF8591::sample ( )

inline

Sample the channel defined by the latest begin() call. Return sample value.

Returns

sample

Definition at line 99 of file PCF8591.hh.

uint8_t PCF8591::sample ( uint8_t  cntl )

inline

Sample the given channel and return converted value.

Parameters

[in]

cntl

control byte

Returns

sample

Definition at line 112 of file PCF8591.hh.

int PCF8591::sample ( uint8_t *  buf, uint8_t  size  )

inline

Read a sequence of samples the channel defined by the latest begin() call.

Parameters

[in]	buf	sample buffer.
[in]	size	of sample buffer.

Returns

count or negative error code.

Definition at line 128 of file PCF8591.hh.

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The documentation for this class was generated from the following files:

• libraries/PCF8591/PCF8591.hh
• libraries/PCF8591/PCF8591.cpp