i2c_samd20/i2c_slave.c File Reference

SAM D20 I2C Slave Driver.

Copyright (c) 2013-2018 Microchip Technology Inc. and its subsidiaries.

#include "i2c_slave.h"
#include "i2c_slave_interrupt.h"

Functions
static enum status_code	_i2c_slave_set_config (struct i2c_slave_module *const module, const struct i2c_slave_config *const config)
static enum status_code	_i2c_slave_wait_for_bus (struct i2c_slave_module *const module)
void	i2c_slave_clear_status (struct i2c_slave_module *const module, uint32_t status_flags)
	Clears a module status flag. More...
enum i2c_slave_direction	i2c_slave_get_direction_wait (struct i2c_slave_module *const module)
	Waits for a start condition on the bus. More...
uint32_t	i2c_slave_get_status (struct i2c_slave_module *const module)
	Retrieves the current module status. More...
enum status_code	i2c_slave_init (struct i2c_slave_module *const module, Sercom *const hw, const struct i2c_slave_config *const config)
	Initializes the requested I2C hardware module. More...
enum status_code	i2c_slave_read_packet_wait (struct i2c_slave_module *const module, struct i2c_slave_packet *const packet)
	Reads a packet from the master. More...
void	i2c_slave_reset (struct i2c_slave_module *const module)
	Resets the hardware module. More...
enum status_code	i2c_slave_write_packet_wait (struct i2c_slave_module *const module, struct i2c_slave_packet *const packet)
	Writes a packet to the master. More...

static enum status_code _i2c_slave_set_config ( struct i2c_slave_module *const  module, const struct i2c_slave_config *const  config  )

static

Sets configuration to module

Parameters

[out]	module	Pointer to software module structure
[in]	config	Configuration structure with configurations to set

Returns

Status of setting configuration.

Return values

STATUS_OK	Module was configured correctly
STATUS_ERR_ALREADY_INITIALIZED	If setting other GCLK generator than previously set

References _sercom_get_default_pad(), i2c_slave_config::address, i2c_slave_config::address_mask, i2c_slave_config::address_mode, Assert, i2c_slave_config::buffer_timeout, system_pinmux_config::direction, i2c_slave_config::enable_general_call_address, system_pinmux_config::mux_position, PINMUX_DEFAULT, i2c_slave_config::pinmux_pad0, i2c_slave_config::pinmux_pad1, i2c_slave_config::run_in_standby, i2c_slave_config::scl_low_timeout, i2c_slave_config::sda_hold_time, STATUS_OK, system_is_debugger_present(), system_pinmux_get_config_defaults(), SYSTEM_PINMUX_PIN_DIR_OUTPUT_WITH_READBACK, and system_pinmux_pin_set_config().

Referenced by i2c_slave_init().

static enum status_code _i2c_slave_wait_for_bus ( struct i2c_slave_module *const  module )

static

Waits for answer on bus

Parameters

[in]

module

Pointer to software module structure

Returns

Status of bus.

Return values

STATUS_OK	If given response from slave device
STATUS_ERR_TIMEOUT	If no response was given within specified timeout period

References Assert, STATUS_ERR_TIMEOUT, and STATUS_OK.

Referenced by i2c_slave_get_direction_wait(), i2c_slave_read_packet_wait(), and i2c_slave_write_packet_wait().