sercom.h File Reference

SAM Serial Peripheral Interface Driver.

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

#include <compiler.h>
#include <system.h>
#include <clock.h>
#include <system_interrupt.h>
#include "sercom_pinout.h"

Macros
#define	FEATURE_SERCOM_SYNCBUSY_SCHEME_VERSION_1
#define	SERCOM_GCLK_ID   SERCOM0_GCLK_ID_SLOW

Enumerations
enum	sercom_asynchronous_operation_mode {   SERCOM_ASYNC_OPERATION_MODE_ARITHMETIC = 0,   SERCOM_ASYNC_OPERATION_MODE_FRACTIONAL }
	sercom asynchronous operation mode More...
enum	sercom_asynchronous_sample_num {   SERCOM_ASYNC_SAMPLE_NUM_3 = 3,   SERCOM_ASYNC_SAMPLE_NUM_8 = 8,   SERCOM_ASYNC_SAMPLE_NUM_16 = 16 }
	sercom asynchronous samples per bit More...

Functions
enum status_code	_sercom_get_async_baud_val (const uint32_t baudrate, const uint32_t peripheral_clock, uint16_t *const baudval, enum sercom_asynchronous_operation_mode mode, enum sercom_asynchronous_sample_num sample_num)
uint32_t	_sercom_get_default_pad (Sercom *const sercom_module, const uint8_t pad)
uint8_t	_sercom_get_sercom_inst_index (Sercom *const sercom_instance)
enum status_code	_sercom_get_sync_baud_val (const uint32_t baudrate, const uint32_t external_clock, uint16_t *const baudval)
enum status_code	sercom_set_gclk_generator (const enum gclk_generator generator_source, const bool force_change)
	Set GCLK channel to generator. More...

#define FEATURE_SERCOM_SYNCBUSY_SCHEME_VERSION_1

#define SERCOM_GCLK_ID   SERCOM0_GCLK_ID_SLOW

Referenced by sercom_set_gclk_generator().

enum sercom_asynchronous_operation_mode

sercom asynchronous operation mode

Select sercom asynchronous operation mode

Enumerator
SERCOM_ASYNC_OPERATION_MODE_ARITHMETIC
SERCOM_ASYNC_OPERATION_MODE_FRACTIONAL

enum sercom_asynchronous_sample_num

sercom asynchronous samples per bit

Select number of samples per bit

Enumerator
SERCOM_ASYNC_SAMPLE_NUM_3
SERCOM_ASYNC_SAMPLE_NUM_8
SERCOM_ASYNC_SAMPLE_NUM_16

enum status_code _sercom_get_async_baud_val	(	const uint32_t	baudrate,
		const uint32_t	peripheral_clock,
		uint16_t *const	baudval,
		enum sercom_asynchronous_operation_mode	mode,
		enum sercom_asynchronous_sample_num	sample_num
	)

Referenced by _usart_set_config().

uint32_t _sercom_get_default_pad	(	Sercom *const	sercom_module,
		const uint8_t	pad
	)

Gets the default PAD pinout for a given SERCOM.

Returns the pinmux settings for the given SERCOM and pad. This is used for default configuration of pins.

Parameters

[in]	sercom_module	Pointer to the SERCOM module
[in]	pad	PAD to get default pinout for

Returns

The default pinmux for the given SERCOM instance and PAD

References _SERCOM_PAD_DEFAULTS_CASE, Assert, and MREPEAT.

Referenced by _spi_set_config(), and usart_init().

uint8_t _sercom_get_sercom_inst_index

(

Sercom *const

sercom_instance

)

Find index of given instance.

Parameters

[in]

sercom_instance

Instance pointer.

Returns

Index of given instance.

References Assert.

Referenced by _sercom_get_interrupt_vector(), _spi_set_config(), _usart_set_config(), cdc_rx_init(), spi_init(), spi_set_baudrate(), and usart_init().

enum status_code _sercom_get_sync_baud_val	(	const uint32_t	baudrate,
		const uint32_t	external_clock,
		uint16_t *const	baudval
	)

Referenced by _spi_set_config(), _usart_set_config(), and spi_set_baudrate().

enum status_code sercom_set_gclk_generator	(	const enum gclk_generator	generator_source,
		const bool	force_change
	)

Set GCLK channel to generator.

This will set the appropriate GCLK channel to the requested GCLK generator. This will set the generator for all SERCOM instances, and the user will thus only be able to set the same generator that has previously been set, if any.

After the generator has been set the first time, the generator can be changed using the force_change flag.

Parameters

[in]	generator_source	The generator to use for SERCOM.
[in]	force_change	Force change the generator.

Returns

Status code indicating the GCLK generator change operation.

Return values

STATUS_OK	If the generator update request was successful.
STATUS_ERR_ALREADY_INITIALIZED	If a generator was already configured and the new configuration was not forced.

References SERCOM_GCLK_ID, system_gclk_chan_config::source_generator, STATUS_ERR_ALREADY_INITIALIZED, STATUS_OK, system_gclk_chan_enable(), system_gclk_chan_get_config_defaults(), and system_gclk_chan_set_config().

Referenced by spi_init(), and usart_init().