Two-Wire Interface (TWI) driver for SAM.

#include "compiler.h"

Data Structures
struct	twi_options
	Input parameters when initializing the TWI module mode. More...

struct	twi_packet
	Information concerning the data transmission. More...

Macros
#define	TWI_TIMEOUT 30000
	Time-out value (number of attempts). More...


#define	TWI_SUCCESS 0
	Return codes for TWI APIs. More...

#define	TWI_INVALID_ARGUMENT 1

#define	TWI_ARBITRATION_LOST 2

#define	TWI_NO_CHIP_FOUND 3

#define	TWI_RECEIVE_OVERRUN 4

#define	TWI_RECEIVE_NACK 5

#define	TWI_SEND_OVERRUN 6

#define	TWI_SEND_NACK 7

#define	TWI_BUSY 8

#define	TWI_ERROR_TIMEOUT 9

Typedefs
typedef struct twi_options	twi_options_t
	Input parameters when initializing the TWI module mode. More...

typedef struct twi_packet	twi_packet_t
	Information concerning the data transmission. More...

Enumerations
enum	twi_source_clock { TWI_SOURCE_PERIPH_CLK = TWI_CWGR_BRSRCCLK_PERIPH_CLK, TWI_SOURCE_PCK_CLK = TWI_CWGR_BRSRCCLK_PMC_PCK }

Functions
static void	twi_clear_disable_clock_wait_state (Twi *p_twi)
	Clear clock wait state disable mode. More...

static void	twi_disable_alternative_command (Twi *p_twi)
	Enable alternative command mode. More...

static void	twi_disable_clock_wait_state (Twi *p_twi)
	Clock stretching disabled in slave mode, OVRE and UNRE will indicate overrun and underrun. More...

static void	twi_disable_highspeed (Twi *p_twi)
	Disable high speed mode. More...

void	twi_disable_interrupt (Twi *p_twi, uint32_t ul_sources)
	Disable TWI interrupts. More...

void	twi_disable_master_mode (Twi *p_twi)
	Disable TWI master mode. More...

static void	twi_disable_pec (Twi *p_twi)
	Disable packet error checking. More...

static void	twi_disable_slave_addr1_matching (Twi *p_twi)
	Slave Address 1 matching disabled. More...

static void	twi_disable_slave_addr2_matching (Twi *p_twi)
	Slave Address 2 matching disabled. More...

static void	twi_disable_slave_addr3_matching (Twi *p_twi)
	Slave Address 3 matching disabled. More...

static void	twi_disable_slave_data_matching (Twi *p_twi)
	First received data matching disabled. More...

static void	twi_disable_slave_default_addr (Twi *p_twi)
	Acknowledge of the SMBus Default Address disabled. More...

void	twi_disable_slave_mode (Twi *p_twi)
	Disable TWI slave mode. More...

static void	twi_disable_slave_nack (Twi *p_twi)
	Normal value to be returned in the ACK cycle of the data phase in slave receiver mode. More...

static void	twi_disable_smbus (Twi *p_twi)
	Disable SMBus mode. More...

static void	twi_disable_smbus_host_header (Twi *p_twi)
	Acknowledge of the SMBus Host Header disabled. More...

static void	twi_enable_alternative_command (Twi *p_twi)
	Enable alternative command mode. More...

static void	twi_enable_highspeed (Twi *p_twi)
	Enable high speed mode. More...

void	twi_enable_interrupt (Twi *p_twi, uint32_t ul_sources)
	Enable TWI interrupts. More...

void	twi_enable_master_mode (Twi *p_twi)
	Enable TWI master mode. More...

static void	twi_enable_pec (Twi *p_twi)
	Enable packet error checking. More...

static void	twi_enable_slave_addr1_matching (Twi *p_twi)
	Slave Address 1 matching enabled. More...

static void	twi_enable_slave_addr2_matching (Twi *p_twi)
	Slave Address 2 matching enabled. More...

static void	twi_enable_slave_addr3_matching (Twi *p_twi)
	Slave Address 3 matching enabled. More...

static void	twi_enable_slave_default_addr (Twi *p_twi)
	Acknowledge of the SMBus Default Address enabled. More...

void	twi_enable_slave_mode (Twi *p_twi)
	Enable TWI slave mode. More...

static void	twi_enable_slave_nack (Twi *p_twi)
	NACK value to be returned in the ACK cycle of the data phase in slave receiver mode. More...

static void	twi_enable_smbus (Twi *p_twi)
	Enable SMBus mode. More...

static void	twi_enable_smbus_host_header (Twi *p_twi)
	Acknowledge of the SMBus Host Header enabled. More...

uint32_t	twi_get_interrupt_mask (Twi *p_twi)
	Read TWI interrupt mask. More...

uint32_t	twi_get_interrupt_status (Twi *p_twi)
	Get TWI interrupt status. More...

Pdc *	twi_get_pdc_base (Twi *p_twi)
	Get TWI PDC base address. More...

static void	twi_lock_clear (Twi *p_twi)
	Clear the TWI FSM lock. More...

void	twi_mask_slave_addr (Twi *p_twi, uint32_t ul_mask)

uint32_t	twi_master_init (Twi p_twi, const twi_options_t p_opt)
	Initialize TWI master mode. More...

uint32_t	twi_master_read (Twi p_twi, twi_packet_t p_packet)
	Read multiple bytes from a TWI compatible slave device. More...

uint32_t	twi_master_write (Twi p_twi, twi_packet_t p_packet)
	Write multiple bytes to a TWI compatible slave device. More...

uint32_t	twi_mk_addr (const uint8_t *addr, int len)
	Construct the TWI module address register field. More...

uint32_t	twi_probe (Twi *p_twi, uint8_t uc_slave_addr)
	Test if a chip answers a given I2C address. More...

uint8_t	twi_read_byte (Twi *p_twi)
	Reads a byte from the TWI bus. More...

void	twi_read_write_protection_status (Twi p_twi, uint32_t p_status)

static void	twi_request_pec (Twi *p_twi)
	Request a packet error checking. More...

void	twi_reset (Twi *p_twi)
	Reset TWI. More...

static void	twi_select_source_clock (Twi *p_twi, enum twi_source_clock src_clk)
	Select the souce clock for the bit rate generation. More...

static void	twi_send_clear (Twi *p_twi)
	If master mode is enabled, send a bus clear command. More...

void	twi_set_alternative_command (Twi *p_twi, uint32_t ul_alt_cmd)

void	twi_set_filter (Twi *p_twi, uint32_t ul_filter)

void	twi_set_slave_addr (Twi *p_twi, uint32_t ul_device_addr)
	Set TWI slave address. More...

void	twi_set_sleepwalking (Twi *p_twi, uint32_t ul_matching_addr1, bool flag1, uint32_t ul_matching_addr2, bool flag2, uint32_t ul_matching_addr3, bool flag3, uint32_t ul_matching_data, bool flag)

uint32_t	twi_set_speed (Twi *p_twi, uint32_t ul_speed, uint32_t ul_mck)
	Set the I2C bus speed in conjunction with the clock frequency. More...

void	twi_set_write_protection (Twi *p_twi, bool flag)

void	twi_slave_init (Twi *p_twi, uint32_t ul_device_addr)
	Initialize TWI slave mode. More...

uint32_t	twi_slave_read (Twi p_twi, uint8_t p_data)
	Read data from master. More...

uint32_t	twi_slave_write (Twi p_twi, uint8_t p_data)
	Write data to TWI bus. More...

void	twi_smbus_set_timing (Twi *p_twi, uint32_t ul_timing)

static void	twi_thr_clear (Twi *p_twi)
	Clear the Transmit Holding Register and set TXRDY, TXCOMP flags. More...

void	twi_write_byte (Twi *p_twi, uint8_t uc_byte)
	Sends a byte of data to one of the TWI slaves on the bus. More...

#define TWI_ARBITRATION_LOST 2

#define TWI_BUSY 8

#define TWI_ERROR_TIMEOUT 9

Referenced by twi_master_read().

#define TWI_INVALID_ARGUMENT 1

Referenced by twi_master_init(), twi_master_read(), and twi_master_write().

#define TWI_NO_CHIP_FOUND 3

#define TWI_RECEIVE_NACK 5

Referenced by twi_master_read(), and twi_master_write().

#define TWI_RECEIVE_OVERRUN 4

#define TWI_SEND_NACK 7

#define TWI_SEND_OVERRUN 6

#define TWI_SUCCESS 0

Return codes for TWI APIs.

Referenced by main(), twi_master_init(), twi_master_read(), and twi_master_write().

#define TWI_TIMEOUT 30000

Time-out value (number of attempts).

Referenced by twi_master_read().

typedef struct twi_options twi_options_t

Input parameters when initializing the TWI module mode.

typedef struct twi_packet twi_packet_t

Information concerning the data transmission.

enum twi_source_clock

Enumerator
TWI_SOURCE_PERIPH_CLK
TWI_SOURCE_PCK_CLK

static void twi_clear_disable_clock_wait_state ( Twi * p_twi )

inlinestatic

Clear clock wait state disable mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_alternative_command ( Twi * p_twi )

inlinestatic

Enable alternative command mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_clock_wait_state ( Twi * p_twi )

inlinestatic

Clock stretching disabled in slave mode, OVRE and UNRE will indicate overrun and underrun.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_highspeed ( Twi * p_twi )

inlinestatic

Disable high speed mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_pec ( Twi * p_twi )

inlinestatic

Disable packet error checking.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_slave_addr1_matching ( Twi * p_twi )

inlinestatic

Slave Address 1 matching disabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_slave_addr2_matching ( Twi * p_twi )

inlinestatic

Slave Address 2 matching disabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_slave_addr3_matching ( Twi * p_twi )

inlinestatic

Slave Address 3 matching disabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_slave_data_matching ( Twi * p_twi )

inlinestatic

First received data matching disabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_slave_default_addr ( Twi * p_twi )

inlinestatic

Acknowledge of the SMBus Default Address disabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_slave_nack ( Twi * p_twi )

inlinestatic

Normal value to be returned in the ACK cycle of the data phase in slave receiver mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_smbus ( Twi * p_twi )

inlinestatic

Disable SMBus mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_disable_smbus_host_header ( Twi * p_twi )

inlinestatic

Acknowledge of the SMBus Host Header disabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_alternative_command ( Twi * p_twi )

inlinestatic

Enable alternative command mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_highspeed ( Twi * p_twi )

inlinestatic

Enable high speed mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_pec ( Twi * p_twi )

inlinestatic

Enable packet error checking.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_slave_addr1_matching ( Twi * p_twi )

inlinestatic

Slave Address 1 matching enabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_slave_addr2_matching ( Twi * p_twi )

inlinestatic

Slave Address 2 matching enabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_slave_addr3_matching ( Twi * p_twi )

inlinestatic

Slave Address 3 matching enabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_slave_default_addr ( Twi * p_twi )

inlinestatic

Acknowledge of the SMBus Default Address enabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_slave_nack ( Twi * p_twi )

inlinestatic

NACK value to be returned in the ACK cycle of the data phase in slave receiver mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_smbus ( Twi * p_twi )

inlinestatic

Enable SMBus mode.

Parameters

p_twi Base address of the TWI instance.

static void twi_enable_smbus_host_header ( Twi * p_twi )

inlinestatic

Acknowledge of the SMBus Host Header enabled.

Parameters

p_twi Base address of the TWI instance.

static void twi_lock_clear ( Twi * p_twi )

inlinestatic

Clear the TWI FSM lock.

Parameters

p_twi Base address of the TWI instance.

void twi_mask_slave_addr	(	Twi *	p_twi,
		uint32_t	ul_mask
	)

void twi_read_write_protection_status	(	Twi *	p_twi,
		uint32_t *	p_status
	)

static void twi_request_pec ( Twi * p_twi )

inlinestatic

Request a packet error checking.

Parameters

p_twi Base address of the TWI instance.

static void twi_select_source_clock	(	Twi *	p_twi,
		enum twi_source_clock	src_clk
	)

inlinestatic

Select the souce clock for the bit rate generation.

Parameters

p_twi	Base address of the TWI instance.
src_clk	Source clock.

static void twi_send_clear ( Twi * p_twi )

inlinestatic

If master mode is enabled, send a bus clear command.

Parameters

p_twi Base address of the TWI instance.

void twi_set_alternative_command	(	Twi *	p_twi,
		uint32_t	ul_alt_cmd
	)

void twi_set_filter	(	Twi *	p_twi,
		uint32_t	ul_filter
	)

void twi_set_sleepwalking	(	Twi *	p_twi,
		uint32_t	ul_matching_addr1,
		bool	flag1,
		uint32_t	ul_matching_addr2,
		bool	flag2,
		uint32_t	ul_matching_addr3,
		bool	flag3,
		uint32_t	ul_matching_data,
		bool	flag
	)

void twi_set_write_protection	(	Twi *	p_twi,
		bool	flag
	)

void twi_smbus_set_timing	(	Twi *	p_twi,
		uint32_t	ul_timing
	)

static void twi_thr_clear ( Twi * p_twi )

inlinestatic

Clear the Transmit Holding Register and set TXRDY, TXCOMP flags.

Parameters

p_twi Base address of the TWI instance.

Microchip® Advanced Software Framework

Data Structures

Macros

Typedefs

Enumerations

Functions