spi.h File Reference

SAM Serial Peripheral Interface Driver.

Copyright (c) 2012-2020 Microchip Technology Inc. and its subsidiaries.

#include <compiler.h>
#include <port.h>
#include <sercom.h>
#include <pinmux.h>
#include <string.h>
#include <conf_spi.h>
#include <sercom_interrupt.h>

Data Structures
struct	spi_config
	SPI configuration structure. More...
struct	spi_master_config
	SPI Master configuration structure. More...
struct	spi_module
	SERCOM SPI driver software device instance structure. More...
struct	spi_slave_config
	SPI slave configuration structure. More...
struct	spi_slave_inst
	SPI peripheral slave instance structure. More...
struct	spi_slave_inst_config
	SPI peripheral slave configuration structure. More...

Macros
#define	PINMUX_DEFAULT   0
	Default pinmux. More...
#define	PINMUX_UNUSED   0xFFFFFFFF
	Unused pinmux. More...
#define	SPI_TIMEOUT   10000
	SPI timeout value. More...
Driver Feature Definition
Define SERCOM SPI features set according to different device family.
#define	FEATURE_SPI_SLAVE_SELECT_LOW_DETECT
	SPI slave select low detection. More...
#define	FEATURE_SPI_HARDWARE_SLAVE_SELECT
	Slave select can be controlled by hardware. More...
#define	FEATURE_SPI_ERROR_INTERRUPT
	SPI with error detect feature. More...
#define	FEATURE_SPI_SYNC_SCHEME_VERSION_2
	SPI sync scheme version 2. More...

Typedefs
typedef void(*	spi_callback_t )(struct spi_module *const module)
	Type of the callback functions. More...

Enumerations
enum	spi_addr_mode {   SPI_ADDR_MODE_MASK = SERCOM_SPI_CTRLB_AMODE(0),   SPI_ADDR_MODE_UNIQUE = SERCOM_SPI_CTRLB_AMODE(1),   SPI_ADDR_MODE_RANGE = SERCOM_SPI_CTRLB_AMODE(2) }
	SPI address modes enum. More...
enum	spi_callback {   SPI_CALLBACK_BUFFER_TRANSMITTED,   SPI_CALLBACK_BUFFER_RECEIVED,   SPI_CALLBACK_BUFFER_TRANSCEIVED,   SPI_CALLBACK_ERROR,   SPI_CALLBACK_SLAVE_TRANSMISSION_COMPLETE,   SPI_CALLBACK_SLAVE_SELECT_LOW,   SPI_CALLBACK_COMBINED_ERROR }
	SPI Callback enum. More...
enum	spi_character_size {   SPI_CHARACTER_SIZE_8BIT = SERCOM_SPI_CTRLB_CHSIZE(0),   SPI_CHARACTER_SIZE_9BIT = SERCOM_SPI_CTRLB_CHSIZE(1) }
	SPI character size enum. More...
enum	spi_data_order {   SPI_DATA_ORDER_LSB = SERCOM_SPI_CTRLA_DORD,   SPI_DATA_ORDER_MSB = 0 }
	SPI data order enum. More...
enum	spi_frame_format {   SPI_FRAME_FORMAT_SPI_FRAME = SERCOM_SPI_CTRLA_FORM(0),   SPI_FRAME_FORMAT_SPI_FRAME_ADDR = SERCOM_SPI_CTRLA_FORM(2) }
	SPI frame format enum. More...
enum	spi_interrupt_flag {   SPI_INTERRUPT_FLAG_DATA_REGISTER_EMPTY = SERCOM_SPI_INTFLAG_DRE,   SPI_INTERRUPT_FLAG_TX_COMPLETE = SERCOM_SPI_INTFLAG_TXC,   SPI_INTERRUPT_FLAG_RX_COMPLETE = SERCOM_SPI_INTFLAG_RXC,   SPI_INTERRUPT_FLAG_SLAVE_SELECT_LOW = SERCOM_SPI_INTFLAG_SSL,   SPI_INTERRUPT_FLAG_COMBINED_ERROR = SERCOM_SPI_INTFLAG_ERROR }
	SPI Interrupt Flags. More...
enum	spi_mode {   SPI_MODE_MASTER = 1,   SPI_MODE_SLAVE = 0 }
	SPI modes enum. More...
enum	spi_signal_mux_setting {   SPI_SIGNAL_MUX_SETTING_A,   SPI_SIGNAL_MUX_SETTING_B,   SPI_SIGNAL_MUX_SETTING_C,   SPI_SIGNAL_MUX_SETTING_D,   SPI_SIGNAL_MUX_SETTING_E,   SPI_SIGNAL_MUX_SETTING_F,   SPI_SIGNAL_MUX_SETTING_G,   SPI_SIGNAL_MUX_SETTING_H,   SPI_SIGNAL_MUX_SETTING_I,   SPI_SIGNAL_MUX_SETTING_J,   SPI_SIGNAL_MUX_SETTING_K,   SPI_SIGNAL_MUX_SETTING_L,   SPI_SIGNAL_MUX_SETTING_M,   SPI_SIGNAL_MUX_SETTING_N,   SPI_SIGNAL_MUX_SETTING_O,   SPI_SIGNAL_MUX_SETTING_P }
	SPI signal MUX settings. More...
enum	spi_transfer_mode {   SPI_TRANSFER_MODE_0 = 0,   SPI_TRANSFER_MODE_1 = SERCOM_SPI_CTRLA_CPHA,   SPI_TRANSFER_MODE_2 = SERCOM_SPI_CTRLA_CPOL,   SPI_TRANSFER_MODE_3 = SERCOM_SPI_CTRLA_CPHA | SERCOM_SPI_CTRLA_CPOL }
	SPI transfer modes enum. More...

Functions
static bool	spi_is_syncing (struct spi_module *const module)
	Determines if the SPI module is currently synchronizing to the bus. More...
enum status_code	spi_set_baudrate (struct spi_module *const module, uint32_t baudrate)
	Set the baudrate of the SPI module. More...
Driver Initialization and Configuration
static void	spi_get_config_defaults (struct spi_config *const config)
	Initializes an SPI configuration structure to default values. More...
static void	spi_slave_inst_get_config_defaults (struct spi_slave_inst_config *const config)
	Initializes an SPI peripheral slave device configuration structure to default values. More...
static void	spi_attach_slave (struct spi_slave_inst *const slave, const struct spi_slave_inst_config *const config)
	Attaches an SPI peripheral slave. More...
enum status_code	spi_init (struct spi_module *const module, Sercom *const hw, const struct spi_config *const config)
	Initializes the SERCOM SPI module. More...
Enable/Disable
static void	spi_enable (struct spi_module *const module)
	Enables the SERCOM SPI module. More...
static void	spi_disable (struct spi_module *const module)
	Disables the SERCOM SPI module. More...
void	spi_reset (struct spi_module *const module)
	Resets the SPI module. More...
Lock/Unlock
static enum status_code	spi_lock (struct spi_module *const module)
	Attempt to get lock on driver instance. More...
static void	spi_unlock (struct spi_module *const module)
	Unlock driver instance. More...
Ready to Write/Read
static bool	spi_is_write_complete (struct spi_module *const module)
	Checks if the SPI in master mode has shifted out last data, or if the master has ended the transfer in slave mode. More...
static bool	spi_is_ready_to_write (struct spi_module *const module)
	Checks if the SPI module is ready to write data. More...
static bool	spi_is_ready_to_read (struct spi_module *const module)
	Checks if the SPI module is ready to read data. More...
Read/Write
static enum status_code	spi_write (struct spi_module *module, uint16_t tx_data)
	Transfers a single SPI character. More...
enum status_code	spi_write_buffer_wait (struct spi_module *const module, const uint8_t *tx_data, uint16_t length)
	Sends a buffer of length SPI characters. More...
static enum status_code	spi_read (struct spi_module *const module, uint16_t *rx_data)
	Reads last received SPI character. More...
enum status_code	spi_read_buffer_wait (struct spi_module *const module, uint8_t *rx_data, uint16_t length, uint16_t dummy)
	Reads buffer of length SPI characters. More...
enum status_code	spi_transceive_wait (struct spi_module *const module, uint16_t tx_data, uint16_t *rx_data)
	Sends and reads a single SPI character. More...
enum status_code	spi_transceive_buffer_wait (struct spi_module *const module, uint8_t *tx_data, uint8_t *rx_data, uint16_t length)
	Sends and receives a buffer of length SPI characters. More...
enum status_code	spi_select_slave (struct spi_module *const module, struct spi_slave_inst *const slave, bool select)
	Selects slave device. More...