twi.c File Reference

#include <avr32/io.h>
#include "compiler.h"
#include "twi.h"

Macros
#define	CONF_TWI_IRQ_GROUP   AVR32_TWI_IRQ_GROUP
#define	CONF_TWI_IRQ_LINE   AVR32_TWI_IRQ

Functions
	ISR (twi_master_interrupt_handler, CONF_TWI_IRQ_GROUP, CONF_TWI_IRQ_LEVEL)
	TWI interrupt handler. More...
	ISR (twi_slave_interrupt_handler, AVR32_TWI_IRQ_GROUP, CONF_TWI_IRQ_LEVEL)
	TWI interrupt handler. More...
void	twi_disable_interrupt (volatile avr32_twi_t *twi)
	Disable all TWI interrupts. More...
bool	twi_is_busy (void)
	Test if a TWI read/write is pending. More...
int	twi_master_init (volatile avr32_twi_t *twi, const twi_options_t *opt)
	Initialize the twi master module. More...
int	twi_master_read (volatile avr32_twi_t *twi, const twi_package_t *package)
	Read multiple bytes from a TWI compatible slave device. More...
int	twi_master_write (volatile avr32_twi_t *twi, const twi_package_t *package)
	Write multiple bytes to a TWI compatible slave device. More...
int	twi_master_write_ex (volatile avr32_twi_t *twi, const twi_package_t *package)
	This function is not blocking. More...
static uint32_t	twi_mk_addr (const uint8_t *addr, int len)
	Construct the TWI module address register field. More...
int	twi_probe (volatile avr32_twi_t *twi, char chip_addr)
	Test if a chip answers for a given twi address. More...
static int	twi_set_speed (volatile avr32_twi_t *twi, unsigned int speed, unsigned long pba_hz)
	Set the twi bus speed in conjunction with the clock frequency. More...
int	twi_slave_init (volatile avr32_twi_t *twi, const twi_options_t *opt, const twi_slave_fct_t *slave_fct)
	Initialize the twi slave module. More...

Variables
static volatile bool	twi_busy = false
	Signal end of transaction. More...
static volatile avr32_twi_t *	twi_inst
	Pointer to the instance of the TWI registers for IT. More...
static volatile unsigned long	twi_it_mask
	IT mask. More...
static volatile bool	twi_nack = false
	Add NACK boolean. More...
static volatile unsigned char *volatile	twi_rx_data = NULL
	Pointer to the applicative TWI receive buffer. More...
static volatile int	twi_rx_nb_bytes = 0
	Remaining number of bytes to receive. More...
static twi_slave_fct_t	twi_slave_fct
	Pointer on TWI slave application routines. More...
static const unsigned char *volatile	twi_tx_data = NULL
	Pointer to the applicative TWI transmit buffer. More...
static volatile int	twi_tx_nb_bytes = 0
	Remaining number of bytes to transmit. More...

#define CONF_TWI_IRQ_GROUP   AVR32_TWI_IRQ_GROUP

#define CONF_TWI_IRQ_LINE   AVR32_TWI_IRQ

Referenced by twi_master_init(), and twi_slave_init().

ISR	(	twi_master_interrupt_handler	,
		CONF_TWI_IRQ_GROUP	,
		CONF_TWI_IRQ_LEVEL
	)

TWI interrupt handler.

References twi_busy, twi_inst, twi_it_mask, twi_nack, twi_rx_data, twi_rx_nb_bytes, twi_tx_data, and twi_tx_nb_bytes.

ISR	(	twi_slave_interrupt_handler	,
		AVR32_TWI_IRQ_GROUP	,
		CONF_TWI_IRQ_LEVEL
	)

TWI interrupt handler.

References twi_slave_fct_t::rx, twi_slave_fct_t::stop, twi_inst, twi_it_mask, and twi_slave_fct_t::tx.

static uint32_t twi_mk_addr ( const uint8_t *  addr, int  len  )

static

Construct the TWI module address register field.

The TWI module address register is sent out MSB first. And the size controls which byte is the MSB to start with.

Please see the device datasheet for details on this.

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

static int twi_set_speed ( volatile avr32_twi_t *  twi, unsigned int  speed, unsigned long  pba_hz  )

static

Set the twi bus speed in conjunction with the clock frequency.

Parameters

twi	Base address of the TWI (i.e. &AVR32_TWI).
speed	The desired twi bus speed
pba_hz	The current running PBA clock frequency

Returns

TWI_SUCCESS

References TWI_SUCCESS.

Referenced by twi_master_init().

volatile bool twi_busy = false

static

Signal end of transaction.

Referenced by ISR(), twi_is_busy(), twi_master_read(), and twi_master_write().

volatile avr32_twi_t* twi_inst

static

Pointer to the instance of the TWI registers for IT.

Referenced by ISR(), twi_master_init(), twi_master_read(), twi_master_write(), twi_master_write_ex(), and twi_slave_init().

volatile unsigned long twi_it_mask

static

IT mask.

Referenced by ISR(), twi_master_read(), twi_master_write(), twi_master_write_ex(), and twi_slave_init().

volatile bool twi_nack = false

static

Add NACK boolean.

Referenced by ISR(), twi_master_read(), twi_master_write(), and twi_master_write_ex().

volatile unsigned char* volatile twi_rx_data = NULL

static

Pointer to the applicative TWI receive buffer.

Referenced by ISR(), and twi_master_read().

volatile int twi_rx_nb_bytes = 0

static

Remaining number of bytes to receive.

Referenced by ISR(), and twi_master_read().

twi_slave_fct_t twi_slave_fct

static

Pointer on TWI slave application routines.

Referenced by main().

const unsigned char* volatile twi_tx_data = NULL

static

Pointer to the applicative TWI transmit buffer.

Referenced by ISR(), twi_master_write(), and twi_master_write_ex().

volatile int twi_tx_nb_bytes = 0

static

Remaining number of bytes to transmit.

Referenced by ISR(), twi_master_write(), and twi_master_write_ex().