i2c_samd20/i2c_master_interrupt.c File Reference

SAM D20 I2C Master Interrupt Driver.

Copyright (c) 2012-2018 Microchip Technology Inc. and its subsidiaries.

#include "i2c_master_interrupt.h"

Functions
static void	_i2c_master_async_address_response (struct i2c_master_module *const module)
void	_i2c_master_interrupt_handler (uint8_t instance)
static void	_i2c_master_read (struct i2c_master_module *const module)
static enum status_code	_i2c_master_read_packet (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
static void	_i2c_master_write (struct i2c_master_module *const module)
static enum status_code	_i2c_master_write_packet (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
enum status_code	i2c_master_read_bytes (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
enum status_code	i2c_master_read_packet_job (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
	Initiates a read packet operation. More...
enum status_code	i2c_master_read_packet_job_no_nack (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
	Initiates a read packet operation without sending a NACK signal and a STOP condition when done. More...
enum status_code	i2c_master_read_packet_job_no_stop (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
	Initiates a read packet operation without sending a STOP condition when done. More...
void	i2c_master_register_callback (struct i2c_master_module *const module, const i2c_master_callback_t callback, enum i2c_master_callback callback_type)
	Registers callback for the specified callback type. More...
void	i2c_master_unregister_callback (struct i2c_master_module *const module, enum i2c_master_callback callback_type)
	Unregisters callback for the specified callback type. More...
enum status_code	i2c_master_write_bytes (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
enum status_code	i2c_master_write_packet_job (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
	Initiates a write packet operation. More...
enum status_code	i2c_master_write_packet_job_no_stop (struct i2c_master_module *const module, struct i2c_master_packet *const packet)
	Initiates a write packet operation without sending a STOP condition when done. More...

static void _i2c_master_async_address_response ( struct i2c_master_module *const  module )

static

Acts on slave address response. Checks for errors concerning master->slave handshake.

Parameters

[in,out]

module

Pointer to software module structure

References _i2c_master_read(), _i2c_master_write(), Assert, I2C_TRANSFER_WRITE, STATUS_BUSY, STATUS_ERR_BAD_ADDRESS, and STATUS_ERR_PACKET_COLLISION.

Referenced by _i2c_master_interrupt_handler().

void _i2c_master_interrupt_handler

(

uint8_t

instance

)

Interrupt handler for I²C master.

Parameters

[in]

instance

SERCOM instance that triggered the interrupt

References _i2c_master_async_address_response(), _i2c_master_read(), _i2c_master_write(), _sercom_instances, Assert, I2C_MASTER_CALLBACK_ERROR, I2C_MASTER_CALLBACK_READ_COMPLETE, I2C_MASTER_CALLBACK_WRITE_COMPLETE, I2C_TRANSFER_READ, I2C_TRANSFER_WRITE, STATUS_BUSY, STATUS_ERR_PACKET_COLLISION, and STATUS_OK.

static void _i2c_master_read ( struct i2c_master_module *const  module )

static

Read next data. Used by interrupt handler to get next data byte from slave.

Parameters

[in,out]

module

Pointer to software module structure

References Assert.

Referenced by _i2c_master_async_address_response(), and _i2c_master_interrupt_handler().

static enum status_code _i2c_master_read_packet ( struct i2c_master_module *const  module, struct i2c_master_packet *const  packet  )

static

Starts a read packet operation.

Parameters

[in,out]	module	Pointer to software module struct
[in,out]	packet	Pointer to I2C packet to transfer

Returns

Status of starting reading I²C packet.

Return values

STATUS_OK	If reading was started successfully
STATUS_BUSY	If module is currently busy with another transfer

References i2c_master_packet::address, Assert, i2c_master_packet::data, i2c_master_packet::data_length, I2C_TRANSFER_READ, STATUS_BUSY, and STATUS_OK.

Referenced by i2c_master_read_packet_job(), i2c_master_read_packet_job_no_nack(), and i2c_master_read_packet_job_no_stop().

static void _i2c_master_write ( struct i2c_master_module *const  module )

static

Write next data. Used by interrupt handler to send next data byte to slave.

Parameters

[in,out]

module

Pointer to software module structure

References Assert, and STATUS_ERR_OVERFLOW.

Referenced by _i2c_master_async_address_response(), and _i2c_master_interrupt_handler().

static enum status_code _i2c_master_write_packet ( struct i2c_master_module *const  module, struct i2c_master_packet *const  packet  )

static

Initiates a write packet operation

Parameters

[in,out]	module	Pointer to software module struct
[in,out]	packet	Pointer to I2C packet to transfer

Returns

Status of starting writing I²C packet job.

Return values

STATUS_OK	If writing was started successfully
STATUS_BUSY	If module is currently busy with another transfer

References i2c_master_packet::address, Assert, i2c_master_packet::data, i2c_master_packet::data_length, I2C_TRANSFER_WRITE, STATUS_BUSY, and STATUS_OK.

Referenced by i2c_master_write_packet_job(), and i2c_master_write_packet_job_no_stop().