pcf8574 base driver function

pcf8574 base driver modules More...

Collaboration diagram for pcf8574 base driver function:

Data Structures
struct	pcf8574_handle_s
	pcf8574 handle structure definition More...
struct	pcf8574_info_s
	pcf8574 information structure definition More...

Typedefs
typedef struct pcf8574_handle_s	pcf8574_handle_t
	pcf8574 handle structure definition
typedef struct pcf8574_info_s	pcf8574_info_t
	pcf8574 information structure definition

Enumerations
enum	pcf8574_address_t {   PCF8574_ADDRESS_A000 = 0 , PCF8574_ADDRESS_A001 = 1 , PCF8574_ADDRESS_A010 = 2 , PCF8574_ADDRESS_A011 = 3 ,   PCF8574_ADDRESS_A100 = 4 , PCF8574_ADDRESS_A101 = 5 , PCF8574_ADDRESS_A110 = 6 , PCF8574_ADDRESS_A111 = 7 }
	pcf8574 address enumeration definition More...
enum	pcf8574_pin_t {   PCF8574_PIN_0 = 0x00 , PCF8574_PIN_1 = 0x01 , PCF8574_PIN_2 = 0x02 , PCF8574_PIN_3 = 0x03 ,   PCF8574_PIN_4 = 0x04 , PCF8574_PIN_5 = 0x05 , PCF8574_PIN_6 = 0x06 , PCF8574_PIN_7 = 0x07 }
	pcf8574 pin enumeration definition More...
enum	pcf8574_pin_level_t { PCF8574_PIN_LEVEL_LOW = 0x00 , PCF8574_PIN_LEVEL_HIGH = 0x01 }
	pcf8574 pin enumeration definition More...

Functions
uint8_t	pcf8574_info (pcf8574_info_t *info)
	get chip's information
uint8_t	pcf8574_set_addr_pin (pcf8574_handle_t *handle, pcf8574_address_t addr_pin)
	set the address pin
uint8_t	pcf8574_get_addr_pin (pcf8574_handle_t *handle, pcf8574_address_t *addr_pin)
	get the address pin
uint8_t	pcf8574_init (pcf8574_handle_t *handle)
	initialize the chip
uint8_t	pcf8574_deinit (pcf8574_handle_t *handle)
	close the chip
uint8_t	pcf8574_read (pcf8574_handle_t *handle, pcf8574_pin_t pin, pcf8574_pin_level_t *level)
	read the pin
uint8_t	pcf8574_write (pcf8574_handle_t *handle, pcf8574_pin_t pin, pcf8574_pin_level_t level)
	write the pin

Detailed Description

pcf8574 base driver modules

Typedef Documentation

pcf8574_handle_t

typedef struct pcf8574_handle_s pcf8574_handle_t

pcf8574 handle structure definition

pcf8574_info_t

typedef struct pcf8574_info_s pcf8574_info_t

pcf8574 information structure definition

Enumeration Type Documentation

pcf8574_address_t

enum pcf8574_address_t

pcf8574 address enumeration definition

Enumerator
PCF8574_ADDRESS_A000	A2A1A0 000
PCF8574_ADDRESS_A001	A2A1A0 001
PCF8574_ADDRESS_A010	A2A1A0 010
PCF8574_ADDRESS_A011	A2A1A0 011
PCF8574_ADDRESS_A100	A2A1A0 100
PCF8574_ADDRESS_A101	A2A1A0 101
PCF8574_ADDRESS_A110	A2A1A0 110
PCF8574_ADDRESS_A111	A2A1A0 111

Definition at line 62 of file driver_pcf8574.h.

pcf8574_pin_level_t

enum pcf8574_pin_level_t

pcf8574 pin enumeration definition

Enumerator
PCF8574_PIN_LEVEL_LOW	low level
PCF8574_PIN_LEVEL_HIGH	high level

Definition at line 92 of file driver_pcf8574.h.

pcf8574_pin_t

enum pcf8574_pin_t

pcf8574 pin enumeration definition

Enumerator
PCF8574_PIN_0	pin 0
PCF8574_PIN_1	pin 1
PCF8574_PIN_2	pin 2
PCF8574_PIN_3	pin 3
PCF8574_PIN_4	pin 4
PCF8574_PIN_5	pin 5
PCF8574_PIN_6	pin 6
PCF8574_PIN_7	pin 7

Definition at line 77 of file driver_pcf8574.h.

Function Documentation

pcf8574_deinit()

uint8_t pcf8574_deinit

(

pcf8574_handle_t *

handle

)

close the chip

Parameters

[in]

*handle

pointer to a pcf8574 handle structure

Returns

status code

• 0 success
• 1 iic deinit failed
• 2 handle is NULL
• 3 handle is not initialized

Note

none

Definition at line 178 of file driver_pcf8574.c.

pcf8574_get_addr_pin()

uint8_t pcf8574_get_addr_pin	(	pcf8574_handle_t *	handle,
		pcf8574_address_t *	addr_pin )

get the address pin

Parameters

[in]	*handle	pointer to a pcf8574 handle structure
[out]	*addr_pin	pointer to a chip address pins buffer

Returns

status code

• 0 success
• 2 handle is NULL

Note

none

Definition at line 82 of file driver_pcf8574.c.

pcf8574_info()

uint8_t pcf8574_info

(

pcf8574_info_t *

info

)

get chip's information

Parameters

[out]

*info

pointer to a pcf8574 info structure

Returns

status code

• 0 success
• 2 handle is NULL

Note

none

Definition at line 361 of file driver_pcf8574.c.

pcf8574_init()

uint8_t pcf8574_init

(

pcf8574_handle_t *

handle

)

initialize the chip

Parameters

[in]

*handle

pointer to a pcf8574 handle structure

Returns

status code

• 0 success
• 1 iic initialization failed
• 2 handle is NULL
• 3 linked functions is NULL
• 4 iic write failed

Note

none

Definition at line 105 of file driver_pcf8574.c.

pcf8574_read()

uint8_t pcf8574_read	(	pcf8574_handle_t *	handle,
		pcf8574_pin_t	pin,
		pcf8574_pin_level_t *	level )

read the pin

Parameters

[in]	*handle	pointer to a pcf8574 handle structure
[in]	pin	read pin
[out]	*level	pointer to a level buffer

Returns

status code

• 0 success
• 1 read failed
• 2 handle is NULL
• 3 handle is not initialized

Note

none

Definition at line 215 of file driver_pcf8574.c.

pcf8574_set_addr_pin()

uint8_t pcf8574_set_addr_pin	(	pcf8574_handle_t *	handle,
		pcf8574_address_t	addr_pin )

set the address pin

Parameters

[in]	*handle	pointer to a pcf8574 handle structure
[in]	addr_pin	chip address pins

Returns

status code

• 0 success
• 2 handle is NULL

Note

none

Definition at line 60 of file driver_pcf8574.c.

pcf8574_write()

uint8_t pcf8574_write	(	pcf8574_handle_t *	handle,
		pcf8574_pin_t	pin,
		pcf8574_pin_level_t	level )

write the pin

Parameters

[in]	*handle	pointer to a pcf8574 handle structure
[in]	pin	written pin
[in]	level	pin level

Returns

status code

• 0 success
• 1 write failed
• 2 handle is NULL
• 3 handle is not initialized

Note

none

Definition at line 253 of file driver_pcf8574.c.